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Edit File : sasl.h \| Size : 50.92 KB
/* This is a proposed C API for support of SASL * *******************************IMPORTANT***************************** * send email to chris.newman@innosoft.com and cyrus-bugs@andrew.cmu.edu * * if you need to add new error codes, callback types, property values, * * etc. It is important to keep the multiple implementations of this * * API from diverging. * *******************************IMPORTANT***************************** * * Basic Type Summary: * sasl_conn_t Context for a SASL connection negotiation * sasl_ssf_t Security layer Strength Factor * sasl_callback_t A typed client/server callback function and context * sasl_interact_t A client interaction descriptor * sasl_secret_t A client password * sasl_rand_t Random data context structure * sasl_security_properties_t An application's required security level * * Callbacks: * sasl_getopt_t client/server: Get an option value * sasl_logmsg_t client/server: Log message handler * sasl_getsimple_t client: Get user/language list * sasl_getsecret_t client: Get authentication secret * sasl_chalprompt_t client: Display challenge and prompt for response * * Server only Callbacks: * sasl_authorize_t user authorization policy callback * sasl_getconfpath_t get path to search for config file * sasl_server_userdb_checkpass check password and auxprops in userdb * sasl_server_userdb_setpass set password in userdb * sasl_server_canon_user canonicalize username routine * * Client/Server Function Summary: * sasl_done Release all SASL global state * sasl_dispose Connection done: Dispose of sasl_conn_t * sasl_getprop Get property (e.g., user name, security layer info) * sasl_setprop Set property (e.g., external ssf) * sasl_errdetail Generate string from last error on connection * sasl_errstring Translate sasl error code to a string * sasl_encode Encode data to send using security layer * sasl_decode Decode data received using security layer * * Utility functions: * sasl_encode64 Encode data to send using MIME base64 encoding * sasl_decode64 Decode data received using MIME base64 encoding * sasl_erasebuffer Erase a buffer * * Client Function Summary: * sasl_client_init Load and initialize client plug-ins (call once) * sasl_client_new Initialize client connection context: sasl_conn_t * sasl_client_start Select mechanism for connection * sasl_client_step Perform one authentication step * * Server Function Summary * sasl_server_init Load and initialize server plug-ins (call once) * sasl_server_new Initialize server connection context: sasl_conn_t * sasl_listmech Create list of available mechanisms * sasl_server_start Begin an authentication exchange * sasl_server_step Perform one authentication exchange step * sasl_checkpass Check a plaintext passphrase * sasl_checkapop Check an APOP challenge/response (uses pseudo "APOP" * mechanism similar to CRAM-MD5 mechanism; optional) * sasl_user_exists Check if user exists * sasl_setpass Change a password or add a user entry * sasl_auxprop_request Request auxiliary properties * sasl_auxprop_getctx Get auxiliary property context for connection * sasl_auxprop_store Store a set of auxiliary properties * * Basic client model: * 1. client calls sasl_client_init() at startup to load plug-ins * 2. when connection formed, call sasl_client_new() * 3. once list of supported mechanisms received from server, client * calls sasl_client_start(). goto 4a * 4. client calls sasl_client_step() * [4a. If SASL_INTERACT, fill in prompts and goto 4 * -- doesn't happen if callbacks provided] * 4b. If SASL error, goto 7 or 3 * 4c. If SASL_OK, continue or goto 6 if last server response was success * 5. send message to server, wait for response * 5a. On data or success with server response, goto 4 * 5b. On failure goto 7 or 3 * 5c. On success with no server response continue * 6. continue with application protocol until connection closes * call sasl_getprop/sasl_encode/sasl_decode() if using security layer * 7. call sasl_dispose(), may return to step 2 * 8. call sasl_done() when program terminates * * Basic Server model: * 1. call sasl_server_init() at startup to load plug-ins * 2. On connection, call sasl_server_new() * 3. call sasl_listmech() and send list to client] * 4. after client AUTH command, call sasl_server_start(), goto 5a * 5. call sasl_server_step() * 5a. If SASL_CONTINUE, output to client, wait response, repeat 5 * 5b. If SASL error, then goto 7 * 5c. If SASL_OK, move on * 6. continue with application protocol until connection closes * call sasl_getprop to get username * call sasl_getprop/sasl_encode/sasl_decode() if using security layer * 7. call sasl_dispose(), may return to step 2 * 8. call sasl_done() when program terminates * ************************************************* * IMPORTANT NOTE: server realms / username syntax * * If a user name contains a "@", then the rightmost "@" in the user name * separates the account name from the realm in which this account is * located. A single server may support multiple realms. If the * server knows the realm at connection creation time (e.g., a server * with multiple IP addresses tightly binds one address to a specific * realm) then that realm must be passed in the user_realm field of * the sasl_server_new call. If user_realm is non-empty and an * unqualified user name is supplied, then the canon_user facility is * expected to append "@" and user_realm to the user name. The canon_user * facility may treat other characters such as "%" as equivalent to "@". * * If the server forbids the use of "@" in user names for other * purposes, this simplifies security validation. / #ifndef SASL_H #define SASL_H 1 #include <stddef.h> / For size_t / / Keep in sync with win32/common.mak / #define SASL_VERSION_MAJOR 2 #define SASL_VERSION_MINOR 1 #define SASL_VERSION_STEP 27 / A convenience macro: same as was defined in the OpenLDAP LDAPDB / #define SASL_VERSION_FULL ((SASL_VERSION_MAJOR << 16) \|\ (SASL_VERSION_MINOR << 8) \| SASL_VERSION_STEP) #include "prop.h" /************ * Basic API * ************/ / SASL result codes: / #define SASL_CONTINUE 1 / another step is needed in authentication / #define SASL_OK 0 / successful result / #define SASL_FAIL -1 / generic failure / #define SASL_NOMEM -2 / memory shortage failure / #define SASL_BUFOVER -3 / overflowed buffer / #define SASL_NOMECH -4 / mechanism not supported / #define SASL_BADPROT -5 / bad protocol / cancel / #define SASL_NOTDONE -6 / can't request info until later in exchange / #define SASL_BADPARAM -7 / invalid parameter supplied / #define SASL_TRYAGAIN -8 / transient failure (e.g., weak key) / #define SASL_BADMAC -9 / integrity check failed / #define SASL_NOTINIT -12 / SASL library not initialized / / -- client only codes -- / #define SASL_INTERACT 2 / needs user interaction / #define SASL_BADSERV -10 / server failed mutual authentication step / #define SASL_WRONGMECH -11 / mechanism doesn't support requested feature / / -- server only codes -- / #define SASL_BADAUTH -13 / authentication failure / #define SASL_NOAUTHZ -14 / authorization failure / #define SASL_TOOWEAK -15 / mechanism too weak for this user / #define SASL_ENCRYPT -16 / encryption needed to use mechanism / #define SASL_TRANS -17 / One time use of a plaintext password will enable requested mechanism for user / #define SASL_EXPIRED -18 / passphrase expired, has to be reset / #define SASL_DISABLED -19 / account disabled / #define SASL_NOUSER -20 / user not found / #define SASL_BADVERS -23 / version mismatch with plug-in / #define SASL_UNAVAIL -24 / remote authentication server unavailable / #define SASL_NOVERIFY -26 / user exists, but no verifier for user / / -- codes for password setting -- / #define SASL_PWLOCK -21 / passphrase locked / #define SASL_NOCHANGE -22 / requested change was not needed / #define SASL_WEAKPASS -27 / passphrase is too weak for security policy / #define SASL_NOUSERPASS -28 / user supplied passwords not permitted / #define SASL_NEED_OLD_PASSWD -29 / sasl_setpass needs old password in order to perform password change / #define SASL_CONSTRAINT_VIOLAT -30 / a property can't be stored, because of some constrains/policy violation / #define SASL_BADBINDING -32 / channel binding failure / #define SASL_CONFIGERR -100 / error when parsing configuration file / / max size of a sasl mechanism name / #define SASL_MECHNAMEMAX 20 #ifdef _WIN32 / Define to have the same layout as a WSABUF / #ifndef STRUCT_IOVEC_DEFINED #define STRUCT_IOVEC_DEFINED 1 struct iovec { long iov_len; char iov_base; }; #endif #else struct iovec; /* Defined in OS headers / #endif / per-connection SASL negotiation state for client or server / typedef struct sasl_conn sasl_conn_t; / Plain text password structure. * len is the length of the password, data is the text. / typedef struct sasl_secret { unsigned long len; unsigned char data[1]; / variable sized / } sasl_secret_t; / random data context structure / typedef struct sasl_rand_s sasl_rand_t; #ifdef __cplusplus extern "C" { #endif /*************************** * Configure Basic Services * ***************************/ / the following functions are used to adjust how allocation and mutexes work * they must be called before all other SASL functions: / #include <sys/types.h> / memory allocation functions which may optionally be replaced: / typedef void sasl_malloc_t(size_t); typedef void sasl_calloc_t(size_t, size_t); typedef void sasl_realloc_t(void , size_t); typedef void sasl_free_t(void ); LIBSASL_API void sasl_set_alloc(sasl_malloc_t , sasl_calloc_t , sasl_realloc_t , sasl_free_t ); /* mutex functions which may optionally be replaced: * sasl_mutex_alloc allocates a mutex structure * sasl_mutex_lock blocks until mutex locked * returns -1 on deadlock or parameter error * returns 0 on success * sasl_mutex_unlock unlocks mutex if it's locked * returns -1 if not locked or parameter error * returns 0 on success * sasl_mutex_free frees a mutex structure / typedef void sasl_mutex_alloc_t(void); typedef int sasl_mutex_lock_t(void mutex); typedef int sasl_mutex_unlock_t(void mutex); typedef void sasl_mutex_free_t(void mutex); LIBSASL_API void sasl_set_mutex(sasl_mutex_alloc_t , sasl_mutex_lock_t , sasl_mutex_unlock_t , sasl_mutex_free_t ); /**************************** * Security preference types * ****************************/ / security layer strength factor -- an unsigned integer usable by the caller * to specify approximate security layer strength desired. Roughly * correlated to effective key length for encryption. * 0 = no protection * 1 = integrity protection only * 40 = 40-bit DES or 40-bit RC2/RC4 * 56 = DES * 112 = triple-DES * 128 = 128-bit RC2/RC4/BLOWFISH * 256 = baseline AES / typedef unsigned sasl_ssf_t; / usage flags provided to sasl_server_new and sasl_client_new: / #define SASL_SUCCESS_DATA 0x0004 / server supports data on success / #define SASL_NEED_PROXY 0x0008 / require a mech that allows proxying / #define SASL_NEED_HTTP 0x0010 / require a mech that can do HTTP auth / /************************** * Security Property Types * **************************/ / Structure specifying the client or server's security policy * and optional additional properties. / / These are the various security flags apps can specify. / / NOPLAINTEXT -- don't permit mechanisms susceptible to simple * passive attack (e.g., PLAIN, LOGIN) * NOACTIVE -- protection from active (non-dictionary) attacks * during authentication exchange. * Authenticates server. * NODICTIONARY -- don't permit mechanisms susceptible to passive * dictionary attack * FORWARD_SECRECY -- require forward secrecy between sessions * (breaking one won't help break next) * NOANONYMOUS -- don't permit mechanisms that allow anonymous login * PASS_CREDENTIALS -- require mechanisms which pass client * credentials, and allow mechanisms which can pass * credentials to do so * MUTUAL_AUTH -- require mechanisms which provide mutual * authentication / #define SASL_SEC_NOPLAINTEXT 0x0001 #define SASL_SEC_NOACTIVE 0x0002 #define SASL_SEC_NODICTIONARY 0x0004 #define SASL_SEC_FORWARD_SECRECY 0x0008 #define SASL_SEC_NOANONYMOUS 0x0010 #define SASL_SEC_PASS_CREDENTIALS 0x0020 #define SASL_SEC_MUTUAL_AUTH 0x0040 #define SASL_SEC_MAXIMUM 0x00FF typedef struct sasl_security_properties { / security strength factor * min_ssf = minimum acceptable final level * max_ssf = maximum acceptable final level / sasl_ssf_t min_ssf; sasl_ssf_t max_ssf; / Maximum security layer receive buffer size. * 0=security layer not supported / unsigned maxbufsize; / bitfield for attacks to protect against / unsigned security_flags; / NULL terminated array of additional property names, values / const char property_names; const char property_values; } sasl_security_properties_t; /***************** * Callback types * *****************/ / * Extensible type for a client/server callbacks * id -- identifies callback type * proc -- procedure call arguments vary based on id * context -- context passed to procedure / / Note that any memory that is allocated by the callback needs to be * freed by the application, be it via function call or interaction. * * It may be freed after sasl__step returns SASL_OK. if the mechanism requires this information to persist (for a security layer, for example) * it must maintain a private copy. / typedef struct sasl_callback { / Identifies the type of the callback function. * Mechanisms must ignore callbacks with id's they don't recognize. / unsigned long id; int (proc)(void); /* Callback function. Types of arguments vary by 'id' / void context; } sasl_callback_t; /* callback ids & functions: / #define SASL_CB_LIST_END 0 / end of list / / option reading callback -- this allows a SASL configuration to be * encapsulated in the caller's configuration system. Some implementations * may use default config file(s) if this is omitted. Configuration items * may be plugin-specific and are arbitrary strings. * * inputs: * context -- option context from callback record * plugin_name -- name of plugin (NULL = general SASL option) * option -- name of option * output: * result -- set to result which persists until next getopt in * same thread, unchanged if option not found * len -- length of result (may be NULL) * returns: * SASL_OK -- no error * SASL_FAIL -- error / typedef int sasl_getopt_t(void context, const char plugin_name, const char option, const char *result, unsigned len); #define SASL_CB_GETOPT 1 /* Logging levels for use with the logging callback function. / #define SASL_LOG_NONE 0 / don't log anything / #define SASL_LOG_ERR 1 / log unusual errors (default) / #define SASL_LOG_FAIL 2 / log all authentication failures / #define SASL_LOG_WARN 3 / log non-fatal warnings / #define SASL_LOG_NOTE 4 / more verbose than LOG_WARN / #define SASL_LOG_DEBUG 5 / more verbose than LOG_NOTE / #define SASL_LOG_TRACE 6 / traces of internal protocols / #define SASL_LOG_PASS 7 / traces of internal protocols, including * passwords / / logging callback -- this allows plugins and the middleware to * log operations they perform. * inputs: * context -- logging context from the callback record * level -- logging level; see above * message -- message to log * returns: * SASL_OK -- no error * SASL_FAIL -- error / typedef int sasl_log_t(void context, int level, const char message); #define SASL_CB_LOG 2 / getpath callback -- this allows applications to specify the * colon-separated path to search for plugins (by default, * taken from an implementation-specific location). * inputs: * context -- getpath context from the callback record * outputs: * path -- colon seperated path * returns: * SASL_OK -- no error * SASL_FAIL -- error / typedef int sasl_getpath_t(void context, const char *path); #define SASL_CB_GETPATH 3 / verify file callback -- this allows applications to check if they * want SASL to use files, file by file. This is intended to allow * applications to sanity check the environment to make sure plugins * or the configuration file can't be written to, etc. * inputs: * context -- verifypath context from the callback record * file -- full path to file to verify * type -- type of file to verify (see below) * returns: * SASL_OK -- no error (file can safely be used) * SASL_CONTINUE -- continue WITHOUT using this file * SASL_FAIL -- error / / these are the types of files libsasl will ask about / typedef enum { SASL_VRFY_PLUGIN=0, / a DLL/shared library plug-in / SASL_VRFY_CONF=1, / a configuration file / SASL_VRFY_PASSWD=2, / a password storage file/db / SASL_VRFY_OTHER=3 / some other file / } sasl_verify_type_t; typedef int sasl_verifyfile_t(void context, const char file, sasl_verify_type_t type); #define SASL_CB_VERIFYFILE 4 / getconfpath callback -- this allows applications to specify the * colon-separated path to search for config files (by default, * taken from the SASL_CONF_PATH environment variable). * inputs: * context -- getconfpath context from the callback record * outputs: * path -- colon seperated path (allocated on the heap; the * library will free it using the sasl_free_t * * passed to sasl_set_callback, or the standard free() * library call). * returns: * SASL_OK -- no error * SASL_FAIL -- error / typedef int sasl_getconfpath_t(void context, char *path); #define SASL_CB_GETCONFPATH 5 / client/user interaction callbacks: / / Simple prompt -- result must persist until next call to getsimple on * same connection or until connection context is disposed * inputs: * context -- context from callback structure * id -- callback id * outputs: * result -- set to NUL terminated string * NULL = user cancel * len -- length of result * returns SASL_OK / typedef int sasl_getsimple_t(void context, int id, const char *result, unsigned len); #define SASL_CB_USER 0x4001 /* client user identity to login as / #define SASL_CB_AUTHNAME 0x4002 / client authentication name / #define SASL_CB_LANGUAGE 0x4003 / comma separated list of RFC 1766 * language codes in order of preference * to be used to localize client prompts * or server error codes / #define SASL_CB_CNONCE 0x4007 / caller supplies client-nonce * primarily for testing purposes / / get a sasl_secret_t (plaintext password with length) * inputs: * conn -- connection context * context -- context from callback structure * id -- callback id * outputs: * psecret -- set to NULL to cancel * set to password structure which must persist until * next call to getsecret in same connection, but middleware * will erase password data when it's done with it. * returns SASL_OK / typedef int sasl_getsecret_t(sasl_conn_t conn, void context, int id, sasl_secret_t psecret); #define SASL_CB_PASS 0x4004 / client passphrase-based secret / / prompt for input in response to a challenge. * input: * context -- context from callback structure * id -- callback id * challenge -- server challenge * output: * result -- NUL terminated result, NULL = user cancel * len -- length of result * returns SASL_OK / typedef int sasl_chalprompt_t(void context, int id, const char challenge, const char prompt, const char defresult, const char result, unsigned len); #define SASL_CB_ECHOPROMPT 0x4005 /* challenge and client enterred result / #define SASL_CB_NOECHOPROMPT 0x4006 / challenge and client enterred result / / prompt (or autoselect) the realm to do authentication in. * may get a list of valid realms. * input: * context -- context from callback structure * id -- callback id * availrealms -- available realms; string list; NULL terminated * list may be empty. * output: * result -- NUL terminated realm; NULL is equivalent to "" * returns SASL_OK * result must persist until the next callback / typedef int sasl_getrealm_t(void context, int id, const char availrealms, const char result); #define SASL_CB_GETREALM (0x4008) /* realm to attempt authentication in / / server callbacks: / / improved callback to verify authorization; * canonicalization now handled elsewhere * conn -- connection context * requested_user -- the identity/username to authorize (NUL terminated) * rlen -- length of requested_user * auth_identity -- the identity associated with the secret (NUL terminated) * alen -- length of auth_identity * default_realm -- default user realm, as passed to sasl_server_new if * urlen -- length of default realm * propctx -- auxiliary properties * returns SASL_OK on success, * SASL_NOAUTHZ or other SASL response on failure / typedef int sasl_authorize_t(sasl_conn_t conn, void context, const char requested_user, unsigned rlen, const char auth_identity, unsigned alen, const char def_realm, unsigned urlen, struct propctx propctx); #define SASL_CB_PROXY_POLICY 0x8001 / functions for "userdb" based plugins to call to get/set passwords. * the location for the passwords is determined by the caller or middleware. * plug-ins may get passwords from other locations. / / callback to verify a plaintext password against the caller-supplied * user database. This is necessary to allow additional <method>s for * encoding of the userPassword property. * user -- NUL terminated user name with user@realm syntax * pass -- password to check (may not be NUL terminated) * passlen -- length of password to check * propctx -- auxiliary properties for user / typedef int sasl_server_userdb_checkpass_t(sasl_conn_t conn, void context, const char user, const char pass, unsigned passlen, struct propctx propctx); #define SASL_CB_SERVER_USERDB_CHECKPASS (0x8005) /* callback to store/change a plaintext password in the user database * user -- NUL terminated user name with user@realm syntax * pass -- password to store (may not be NUL terminated) * passlen -- length of password to store * propctx -- auxiliary properties (not stored) * flags -- see SASL_SET_* flags below (SASL_SET_CREATE optional) / typedef int sasl_server_userdb_setpass_t(sasl_conn_t conn, void context, const char user, const char pass, unsigned passlen, struct propctx propctx, unsigned flags); #define SASL_CB_SERVER_USERDB_SETPASS (0x8006) /* callback for a server-supplied user canonicalization function. * * This function is called directly after the mechanism has the * authentication and authorization IDs. It is called before any * User Canonicalization plugin is called. It has the responsibility * of copying its output into the provided output buffers. * * in, inlen -- user name to canonicalize, may not be NUL terminated * may be same buffer as out * flags -- not currently used, supplied by auth mechanism * user_realm -- the user realm (may be NULL in case of client) * out -- buffer to copy user name * out_max -- max length of user name * out_len -- set to length of user name * * returns * SASL_OK on success * SASL_BADPROT username contains invalid character / / User Canonicalization Function Flags / #define SASL_CU_NONE 0x00 / Not a valid flag to pass / / One of the following two is required / #define SASL_CU_AUTHID 0x01 #define SASL_CU_AUTHZID 0x02 / Combine the following with SASL_CU_AUTHID, if you don't want to fail if auxprop returned SASL_NOUSER/SASL_NOMECH. / #define SASL_CU_EXTERNALLY_VERIFIED 0x04 #define SASL_CU_OVERRIDE 0x08 / mapped to SASL_AUXPROP_OVERRIDE / / The following CU flags are passed "as is" down to auxprop lookup / #define SASL_CU_ASIS_MASK 0xFFF0 / NOTE: Keep in sync with SASL_AUXPROP_<XXX> flags / #define SASL_CU_VERIFY_AGAINST_HASH 0x10 typedef int sasl_canon_user_t(sasl_conn_t conn, void context, const char in, unsigned inlen, unsigned flags, const char user_realm, char out, unsigned out_max, unsigned out_len); #define SASL_CB_CANON_USER (0x8007) /********************************* * Common Client/server functions * *********************************/ / Types of paths to set (see sasl_set_path below). / #define SASL_PATH_TYPE_PLUGIN 0 #define SASL_PATH_TYPE_CONFIG 1 / a simpler way to set plugin path or configuration file path * without the need to set sasl_getpath_t callback. * * This function can be called before sasl_server_init/sasl_client_init. / LIBSASL_API int sasl_set_path (int path_type, char path); /* get sasl library version information * implementation is a vendor-defined string * version is a vender-defined representation of the version #. * * This function is being deprecated in favor of sasl_version_info. / LIBSASL_API void sasl_version(const char implementation, int version); /* Extended version of sasl_version(). * * This function is to be used * for library version display and logging * for bug workarounds in old library versions * * The sasl_version_info is not to be used for API feature detection. * * All parameters are optional. If NULL is specified, the value is not returned. / LIBSASL_API void sasl_version_info (const char implementation, const char version_string, int version_major, int version_minor, int version_step, int version_patch); / dispose of all SASL plugins. Connection * states have to be disposed of before calling this. * * This function is DEPRECATED in favour of sasl_server_done/ * sasl_client_done. / LIBSASL_API void sasl_done(void); / dispose of all SASL plugins. Connection * states have to be disposed of before calling this. * This function should be called instead of sasl_done(), whenever possible. / LIBSASL_API int sasl_server_done(void); / dispose of all SASL plugins. Connection * states have to be disposed of before calling this. * This function should be called instead of sasl_done(), whenever possible. / LIBSASL_API int sasl_client_done(void); / dispose connection state, sets it to NULL * checks for pointer to NULL / LIBSASL_API void sasl_dispose(sasl_conn_t pconn); / translate an error number into a string * input: * saslerr -- the error number * langlist -- comma separated list of RFC 1766 languages (may be NULL) * results: * outlang -- the language actually used (may be NULL if don't care) * returns: * the error message in UTF-8 (only the US-ASCII subset if langlist is NULL) / LIBSASL_API const char sasl_errstring(int saslerr, const char langlist, const char outlang); / get detail about the last error that occurred on a connection * text is sanitized so it's suitable to send over the wire * (e.g., no distinction between SASL_BADAUTH and SASL_NOUSER) * input: * conn -- mandatory connection context * returns: * the error message in UTF-8 (only the US-ASCII subset permitted if no * SASL_CB_LANGUAGE callback is present) / LIBSASL_API const char sasl_errdetail(sasl_conn_t conn); / set the error string which will be returned by sasl_errdetail() using * syslog()-style formatting (e.g. printf-style with %m as most recent * errno error) * * primarily for use by server callbacks such as the sasl_authorize_t * callback and internally to plug-ins * * This will also trigger a call to the SASL logging callback (if any) * with a level of SASL_LOG_FAIL unless the SASL_NOLOG flag is set. * * Messages should be sensitive to the current language setting. If there * is no SASL_CB_LANGUAGE callback messages MUST be US-ASCII otherwise UTF-8 * is used and use of RFC 2482 for mixed-language text is encouraged. * * if conn is NULL, function does nothing / LIBSASL_API void sasl_seterror(sasl_conn_t conn, unsigned flags, const char fmt, ...); #define SASL_NOLOG 0x01 / get property from SASL connection state * propnum -- property number * pvalue -- pointer to value * returns: * SASL_OK -- no error * SASL_NOTDONE -- property not available yet * SASL_BADPARAM -- bad property number / LIBSASL_API int sasl_getprop(sasl_conn_t conn, int propnum, const void *pvalue); #define SASL_USERNAME 0 / pointer to NUL terminated user name / #define SASL_SSF 1 / security layer security strength factor, * if 0, call to sasl_encode, sasl_decode * unnecessary / #define SASL_MAXOUTBUF 2 / security layer max output buf unsigned / #define SASL_DEFUSERREALM 3 / default realm passed to server_new / / or set with setprop / #define SASL_GETOPTCTX 4 / context for getopt callback / #define SASL_CALLBACK 7 / current callback function list / #define SASL_IPLOCALPORT 8 / iplocalport string passed to server_new / #define SASL_IPREMOTEPORT 9 / ipremoteport string passed to server_new / / This returns a string which is either empty or has an error message * from sasl_seterror (e.g., from a plug-in or callback). It differs * from the result of sasl_errdetail() which also takes into account the * last return status code. / #define SASL_PLUGERR 10 / a handle to any delegated credentials or NULL if none is present * is returned by the mechanism. The user will probably need to know * which mechanism was used to actually known how to make use of them * currently only implemented for the gssapi mechanism / #define SASL_DELEGATEDCREDS 11 #define SASL_SERVICE 12 / service passed to sasl__new / #define SASL_SERVERFQDN 13 /* serverFQDN passed to sasl__new / #define SASL_AUTHSOURCE 14 /* name of auth source last used, useful * for failed authentication tracking / #define SASL_MECHNAME 15 / active mechanism name, if any / #define SASL_AUTHUSER 16 / authentication/admin user / #define SASL_APPNAME 17 / application name (used for logging/ configuration), same as appname parameter to sasl_server_init / / GSS-API credential handle for sasl_client_step() or sasl_server_step(). * The application is responsible for releasing this credential handle. / #define SASL_GSS_CREDS 18 / GSS name (gss_name_t) of the peer, as output by gss_inquire_context() * or gss_accept_sec_context(). * On server end this is similar to SASL_USERNAME, but the gss_name_t * structure can contain additional attributes associated with the peer. / #define SASL_GSS_PEER_NAME 19 / Local GSS name (gss_name_t) as output by gss_inquire_context(). This * is particularly useful for servers that respond to multiple names. / #define SASL_GSS_LOCAL_NAME 20 / Channel binding information. Memory is managed by the caller. / typedef struct sasl_channel_binding { const char name; int critical; unsigned long len; const unsigned char data; } sasl_channel_binding_t; #define SASL_CHANNEL_BINDING 21 / HTTP Request (RFC 2616) - ONLY used for HTTP Digest Auth (RFC 2617) / typedef struct sasl_http_request { const char method; /* HTTP Method / const char uri; /* request-URI / const unsigned char entity; /* entity-body / unsigned long elen; / entity-body length / unsigned non_persist; / Is it a non-persistent connection? / } sasl_http_request_t; #define SASL_HTTP_REQUEST 22 / set property in SASL connection state * returns: * SASL_OK -- value set * SASL_BADPARAM -- invalid property or value / LIBSASL_API int sasl_setprop(sasl_conn_t conn, int propnum, const void value); #define SASL_SSF_EXTERNAL 100 / external SSF active (sasl_ssf_t ) / #define SASL_SEC_PROPS 101 /* sasl_security_properties_t / #define SASL_AUTH_EXTERNAL 102 / external authentication ID (const char ) / /* If the SASL_AUTH_EXTERNAL value is non-NULL, then a special version of the * EXTERNAL mechanism is enabled (one for server-embedded EXTERNAL mechanisms). * Otherwise, the EXTERNAL mechanism will be absent unless a plug-in * including EXTERNAL is present. / / do precalculations during an idle period or network round trip * may pass NULL to precompute for some mechanisms prior to connect * returns 1 if action taken, 0 if no action taken / LIBSASL_API int sasl_idle(sasl_conn_t conn); /************** * Client API * *************/ / list of client interactions with user for caller to fill in / typedef struct sasl_interact { unsigned long id; / same as client/user callback ID / const char challenge; /* presented to user (e.g. OTP challenge) / const char prompt; /* presented to user (e.g. "Username: ") / const char defresult; /* default result string / const void result; /* set to point to result / unsigned len; / set to length of result / } sasl_interact_t; / initialize the SASL client drivers * callbacks -- base callbacks for all client connections; * must include getopt callback * returns: * SASL_OK -- Success * SASL_NOMEM -- Not enough memory * SASL_BADVERS -- Mechanism version mismatch * SASL_BADPARAM -- missing getopt callback or error in config file * SASL_NOMECH -- No mechanisms available * ... / LIBSASL_API int sasl_client_init(const sasl_callback_t callbacks); /* initialize a client exchange based on the specified mechanism * service -- registered name of the service using SASL (e.g. "imap") * serverFQDN -- the fully qualified domain name of the server * iplocalport -- client IPv4/IPv6 domain literal string with port * (if NULL, then mechanisms requiring IPaddr are disabled) * ipremoteport -- server IPv4/IPv6 domain literal string with port * (if NULL, then mechanisms requiring IPaddr are disabled) * prompt_supp -- list of client interactions supported * may also include sasl_getopt_t context & call * NULL prompt_supp = user/pass via SASL_INTERACT only * NULL proc = interaction supported via SASL_INTERACT * flags -- server usage flags (see above) * in/out: * pconn -- connection negotiation structure * pointer to NULL => allocate new * * Returns: * SASL_OK -- success * SASL_NOMECH -- no mechanism meets requested properties * SASL_NOMEM -- not enough memory / LIBSASL_API int sasl_client_new(const char service, const char serverFQDN, const char iplocalport, const char ipremoteport, const sasl_callback_t prompt_supp, unsigned flags, sasl_conn_t *pconn); / select a mechanism for a connection * mechlist -- mechanisms server has available (punctuation ignored) * if NULL, then discard cached info and retry last mech * output: * prompt_need -- on SASL_INTERACT, list of prompts needed to continue * may be NULL if callbacks provided * clientout -- the initial client response to send to the server * will be valid until next call to client_start/client_step * NULL if mech doesn't include initial client challenge * mech -- set to mechansm name of selected mechanism (may be NULL) * * Returns: * SASL_OK -- success * SASL_NOMEM -- not enough memory * SASL_NOMECH -- no mechanism meets requested properties * SASL_INTERACT -- user interaction needed to fill in prompt_need list / LIBSASL_API int sasl_client_start(sasl_conn_t conn, const char mechlist, sasl_interact_t prompt_need, const char clientout, unsigned clientoutlen, const char *mech); / do a single authentication step. * serverin -- the server message received by the client, MUST have a NUL * sentinel, not counted by serverinlen * output: * prompt_need -- on SASL_INTERACT, list of prompts needed to continue * clientout -- the client response to send to the server * will be valid until next call to client_start/client_step * * returns: * SASL_OK -- success * SASL_INTERACT -- user interaction needed to fill in prompt_need list * SASL_BADPROT -- server protocol incorrect/cancelled * SASL_BADSERV -- server failed mutual auth / LIBSASL_API int sasl_client_step(sasl_conn_t conn, const char serverin, unsigned serverinlen, sasl_interact_t prompt_need, const char clientout, unsigned clientoutlen); /************** * Server API * *************/ / initialize server drivers, done once per process * callbacks -- callbacks for all server connections; must include * getopt callback * appname -- name of calling application (for lower level logging) * results: * state -- server state * returns: * SASL_OK -- success * SASL_BADPARAM -- error in config file * SASL_NOMEM -- memory failure * SASL_BADVERS -- Mechanism version mismatch / LIBSASL_API int sasl_server_init(const sasl_callback_t callbacks, const char appname); / IP/port syntax: * a.b.c.d;p where a-d are 0-255 and p is 0-65535 port number. * e:f:g:h:i:j:k:l;p where e-l are 0000-ffff lower-case hexidecimal * e:f:g:h:i:j:a.b.c.d;p alternate syntax for previous * * Note that one or more "0" fields in f-k can be replaced with "::" * Thus: e:f:0000:0000:0000:j:k:l;p * can be abbreviated: e:f::j:k:l;p * * A buffer of size 52 is adequate for the longest format with NUL terminator. / / create context for a single SASL connection * service -- registered name of the service using SASL (e.g. "imap") * serverFQDN -- Fully qualified domain name of server. NULL means use * gethostname() or equivalent. * Useful for multi-homed servers. * user_realm -- permits multiple user realms on server, NULL = default * iplocalport -- server IPv4/IPv6 domain literal string with port * (if NULL, then mechanisms requiring IPaddr are disabled) * ipremoteport -- client IPv4/IPv6 domain literal string with port * (if NULL, then mechanisms requiring IPaddr are disabled) * callbacks -- callbacks (e.g., authorization, lang, new getopt context) * flags -- usage flags (see above) * returns: * pconn -- new connection context * * returns: * SASL_OK -- success * SASL_NOMEM -- not enough memory / LIBSASL_API int sasl_server_new(const char service, const char serverFQDN, const char user_realm, const char iplocalport, const char ipremoteport, const sasl_callback_t callbacks, unsigned flags, sasl_conn_t pconn); / Return an array of NUL-terminated strings, terminated by a NULL pointer, * which lists all possible mechanisms that the library can supply * * Returns NULL on failure. / LIBSASL_API const char * sasl_global_listmech(void); /* This returns a list of mechanisms in a NUL-terminated string * conn -- the connection to list mechanisms for (either client * or server) * user -- restricts mechanisms to those available to that user * (may be NULL, not used for client case) * prefix -- appended to beginning of result * sep -- appended between mechanisms * suffix -- appended to end of result * results: * result -- NUL terminated result which persists until next * call to sasl_listmech for this sasl_conn_t * plen -- gets length of result (excluding NUL), may be NULL * pcount -- gets number of mechanisms, may be NULL * * returns: * SASL_OK -- success * SASL_NOMEM -- not enough memory * SASL_NOMECH -- no enabled mechanisms / LIBSASL_API int sasl_listmech(sasl_conn_t conn, const char user, const char prefix, const char sep, const char suffix, const char *result, unsigned plen, int pcount); / start a mechanism exchange within a connection context * mech -- the mechanism name client requested * clientin -- client initial response (NUL terminated), NULL if empty * clientinlen -- length of initial response * serverout -- initial server challenge, NULL if done * (library handles freeing this string) * serveroutlen -- length of initial server challenge * output: * pconn -- the connection negotiation state on success * * Same returns as sasl_server_step() or * SASL_NOMECH if mechanism not available. / LIBSASL_API int sasl_server_start(sasl_conn_t conn, const char mech, const char clientin, unsigned clientinlen, const char *serverout, unsigned serveroutlen); /* perform one step of the SASL exchange * inputlen & input -- client data * NULL on first step if no optional client step * outputlen & output -- set to the server data to transmit * to the client in the next step * (library handles freeing this) * * returns: * SASL_OK -- exchange is complete. * SASL_CONTINUE -- indicates another step is necessary. * SASL_TRANS -- entry for user exists, but not for mechanism * and transition is possible * SASL_BADPARAM -- service name needed * SASL_BADPROT -- invalid input from client * ... / LIBSASL_API int sasl_server_step(sasl_conn_t conn, const char clientin, unsigned clientinlen, const char serverout, unsigned serveroutlen); /* check if an apop exchange is valid * (note this is an optional part of the SASL API) * if challenge is NULL, just check if APOP is enabled * inputs: * challenge -- challenge which was sent to client * challen -- length of challenge, 0 = strlen(challenge) * response -- client response, "<user> <digest>" (RFC 1939) * resplen -- length of response, 0 = strlen(response) * returns * SASL_OK -- success * SASL_BADAUTH -- authentication failed * SASL_BADPARAM -- missing challenge * SASL_BADPROT -- protocol error (e.g., response in wrong format) * SASL_NOVERIFY -- user found, but no verifier * SASL_NOMECH -- mechanism not supported * SASL_NOUSER -- user not found / LIBSASL_API int sasl_checkapop(sasl_conn_t conn, const char challenge, unsigned challen, const char response, unsigned resplen); /* check if a plaintext password is valid * if user is NULL, check if plaintext passwords are enabled * inputs: * user -- user to query in current user_domain * userlen -- length of username, 0 = strlen(user) * pass -- plaintext password to check * passlen -- length of password, 0 = strlen(pass) * returns * SASL_OK -- success * SASL_NOMECH -- mechanism not supported * SASL_NOVERIFY -- user found, but no verifier * SASL_NOUSER -- user not found / LIBSASL_API int sasl_checkpass(sasl_conn_t conn, const char user, unsigned userlen, const char pass, unsigned passlen); /* check if a user exists on server * conn -- connection context * service -- registered name of the service using SASL (e.g. "imap") * user_realm -- permits multiple user realms on server, NULL = default * user -- NUL terminated user name * * returns: * SASL_OK -- success * SASL_DISABLED -- account disabled * SASL_NOUSER -- user not found * SASL_NOVERIFY -- user found, but no usable mechanism * SASL_NOMECH -- no mechanisms enabled * SASL_UNAVAIL -- remote authentication server unavailable, try again later / LIBSASL_API int sasl_user_exists(sasl_conn_t conn, const char service, const char user_realm, const char user); / set the password for a user * conn -- SASL connection * user -- user name * pass -- plaintext password, may be NULL to remove user * passlen -- length of password, 0 = strlen(pass) * oldpass -- NULL will sometimes work * oldpasslen -- length of password, 0 = strlen(oldpass) * flags -- see flags below * * returns: * SASL_NOCHANGE -- proper entry already exists * SASL_NOMECH -- no authdb supports password setting as configured * SASL_NOVERIFY -- user exists, but no settable password present * SASL_DISABLED -- account disabled * SASL_PWLOCK -- password locked * SASL_WEAKPASS -- password too weak for security policy * SASL_NOUSERPASS -- user-supplied passwords not permitted * SASL_FAIL -- OS error * SASL_BADPARAM -- password too long * SASL_OK -- successful / LIBSASL_API int sasl_setpass(sasl_conn_t conn, const char user, const char pass, unsigned passlen, const char oldpass, unsigned oldpasslen, unsigned flags); #define SASL_SET_CREATE 0x01 / create a new entry for user / #define SASL_SET_DISABLE 0x02 / disable user account / #define SASL_SET_NOPLAIN 0x04 / do not store secret in plain text / #define SASL_SET_CURMECH_ONLY 0x08 / set the mechanism specific password only. fail if no current mechanism / /******************************************************** * Auxiliary Property Support -- added by cjn 1999-09-29 * ********************************************************/ #define SASL_AUX_END NULL / last auxiliary property / #define SASL_AUX_ALL "" /* A special flag to signal user deletion / / traditional Posix items (should be implemented on Posix systems) / #define SASL_AUX_PASSWORD_PROP "userPassword" / User Password / #define SASL_AUX_PASSWORD "" SASL_AUX_PASSWORD_PROP /* User Password (of authid) / #define SASL_AUX_UIDNUM "uidNumber" / UID number for the user / #define SASL_AUX_GIDNUM "gidNumber" / GID for the user / #define SASL_AUX_FULLNAME "gecos" / full name of the user, unix-style / #define SASL_AUX_HOMEDIR "homeDirectory" / home directory for user / #define SASL_AUX_SHELL "loginShell" / login shell for the user / / optional additional items (not necessarily implemented) / / single preferred mail address for user canonically-quoted * RFC821/822 syntax / #define SASL_AUX_MAILADDR "mail" / path to unix-style mailbox for user / #define SASL_AUX_UNIXMBX "mailMessageStore" / SMTP mail channel name to use if user authenticates successfully / #define SASL_AUX_MAILCHAN "mailSMTPSubmitChannel" / Request a set of auxiliary properties * conn connection context * propnames list of auxiliary property names to request ending with * NULL. * * Subsequent calls will add items to the request list. Call with NULL * to clear the request list. * * errors * SASL_OK -- success * SASL_BADPARAM -- bad count/conn parameter * SASL_NOMEM -- out of memory / LIBSASL_API int sasl_auxprop_request(sasl_conn_t conn, const char *propnames); / Returns current auxiliary property context. * Use functions in prop.h to access content * * if authentication hasn't completed, property values may be empty/NULL * * properties not recognized by active plug-ins will be left empty/NULL * * returns NULL if conn is invalid. / LIBSASL_API struct propctx sasl_auxprop_getctx(sasl_conn_t conn); / Store the set of auxiliary properties for the given user. * Use functions in prop.h to set the content. * * conn connection context * ctx property context from prop_new()/prop_request()/prop_set() * user NUL terminated user * * Call with NULL 'ctx' to see if the backend allows storing properties. * * errors * SASL_OK -- success * SASL_NOMECH -- can not store some/all properties * SASL_BADPARAM -- bad conn/ctx/user parameter * SASL_NOMEM -- out of memory * SASL_FAIL -- failed to store / LIBSASL_API int sasl_auxprop_store(sasl_conn_t conn, struct propctx ctx, const char user); /********************** * security layer API * *********************/ / encode a block of data for transmission using security layer, * returning the input buffer if there is no security layer. * output is only valid until next call to sasl_encode or sasl_encodev * returns: * SASL_OK -- success (returns input if no layer negotiated) * SASL_NOTDONE -- security layer negotiation not finished * SASL_BADPARAM -- inputlen is greater than the SASL_MAXOUTBUF / LIBSASL_API int sasl_encode(sasl_conn_t conn, const char input, unsigned inputlen, const char output, unsigned outputlen); /* encode a block of data for transmission using security layer * output is only valid until next call to sasl_encode or sasl_encodev * returns: * SASL_OK -- success (returns input if no layer negotiated) * SASL_NOTDONE -- security layer negotiation not finished * SASL_BADPARAM -- input length is greater than the SASL_MAXOUTBUF * or no security layer / LIBSASL_API int sasl_encodev(sasl_conn_t conn, const struct iovec invec, unsigned numiov, const char output, unsigned outputlen); /* decode a block of data received using security layer * returning the input buffer if there is no security layer. * output is only valid until next call to sasl_decode * * if outputlen is 0 on return, than the value of output is undefined. * * returns: * SASL_OK -- success (returns input if no layer negotiated) * SASL_NOTDONE -- security layer negotiation not finished * SASL_BADMAC -- bad message integrity check / LIBSASL_API int sasl_decode(sasl_conn_t conn, const char input, unsigned inputlen, const char output, unsigned outputlen); #ifdef __cplusplus } #endif #endif /* SASL_H */ Back

Edit File : sasl.h | Size : 50.92 KB

/* This is a proposed C API for support of SASL
 *
 *********************************IMPORTANT*******************************
 * send email to chris.newman@innosoft.com and cyrus-bugs@andrew.cmu.edu *
 * if you need to add new error codes, callback types, property values,  *
 * etc.   It is important to keep the multiple implementations of this   *
 * API from diverging.                                                   *
 *********************************IMPORTANT*******************************
 *
 * Basic Type Summary:
 *  sasl_conn_t       Context for a SASL connection negotiation
 *  sasl_ssf_t        Security layer Strength Factor
 *  sasl_callback_t   A typed client/server callback function and context
 *  sasl_interact_t   A client interaction descriptor
 *  sasl_secret_t     A client password
 *  sasl_rand_t       Random data context structure
 *  sasl_security_properties_t  An application's required security level
 *
 * Callbacks:
 *  sasl_getopt_t     client/server: Get an option value
 *  sasl_logmsg_t     client/server: Log message handler
 *  sasl_getsimple_t  client: Get user/language list
 *  sasl_getsecret_t  client: Get authentication secret
 *  sasl_chalprompt_t client: Display challenge and prompt for response
 *
 * Server only Callbacks:
 *  sasl_authorize_t             user authorization policy callback
 *  sasl_getconfpath_t           get path to search for config file
 *  sasl_server_userdb_checkpass check password and auxprops in userdb
 *  sasl_server_userdb_setpass   set password in userdb
 *  sasl_server_canon_user       canonicalize username routine
 *
 * Client/Server Function Summary:
 *  sasl_done         Release all SASL global state
 *  sasl_dispose      Connection done: Dispose of sasl_conn_t
 *  sasl_getprop      Get property (e.g., user name, security layer info)
 *  sasl_setprop      Set property (e.g., external ssf)
 *  sasl_errdetail    Generate string from last error on connection
 *  sasl_errstring    Translate sasl error code to a string
 *  sasl_encode       Encode data to send using security layer
 *  sasl_decode       Decode data received using security layer
 *  
 * Utility functions:
 *  sasl_encode64     Encode data to send using MIME base64 encoding
 *  sasl_decode64     Decode data received using MIME base64 encoding
 *  sasl_erasebuffer  Erase a buffer
 *
 * Client Function Summary:
 *  sasl_client_init  Load and initialize client plug-ins (call once)
 *  sasl_client_new   Initialize client connection context: sasl_conn_t
 *  sasl_client_start Select mechanism for connection
 *  sasl_client_step  Perform one authentication step
 *
 * Server Function Summary
 *  sasl_server_init  Load and initialize server plug-ins (call once)
 *  sasl_server_new   Initialize server connection context: sasl_conn_t
 *  sasl_listmech     Create list of available mechanisms
 *  sasl_server_start Begin an authentication exchange
 *  sasl_server_step  Perform one authentication exchange step
 *  sasl_checkpass    Check a plaintext passphrase
 *  sasl_checkapop    Check an APOP challenge/response (uses pseudo "APOP"
 *                    mechanism similar to CRAM-MD5 mechanism; optional)
 *  sasl_user_exists  Check if user exists
 *  sasl_setpass      Change a password or add a user entry
 *  sasl_auxprop_request  Request auxiliary properties
 *  sasl_auxprop_getctx   Get auxiliary property context for connection
 *  sasl_auxprop_store    Store a set of auxiliary properties
 *
 * Basic client model:
 *  1. client calls sasl_client_init() at startup to load plug-ins
 *  2. when connection formed, call sasl_client_new()
 *  3. once list of supported mechanisms received from server, client
 *     calls sasl_client_start().  goto 4a
 *  4. client calls sasl_client_step()
 * [4a. If SASL_INTERACT, fill in prompts and goto 4
 *      -- doesn't happen if callbacks provided]
 *  4b. If SASL error, goto 7 or 3
 *  4c. If SASL_OK, continue or goto 6 if last server response was success
 *  5. send message to server, wait for response
 *  5a. On data or success with server response, goto 4
 *  5b. On failure goto 7 or 3
 *  5c. On success with no server response continue
 *  6. continue with application protocol until connection closes
 *     call sasl_getprop/sasl_encode/sasl_decode() if using security layer
 *  7. call sasl_dispose(), may return to step 2
 *  8. call sasl_done() when program terminates
 *
 * Basic Server model:
 *  1. call sasl_server_init() at startup to load plug-ins
 *  2. On connection, call sasl_server_new()
 *  3. call sasl_listmech() and send list to client]
 *  4. after client AUTH command, call sasl_server_start(), goto 5a
 *  5. call sasl_server_step()
 *  5a. If SASL_CONTINUE, output to client, wait response, repeat 5
 *  5b. If SASL error, then goto 7
 *  5c. If SASL_OK, move on
 *  6. continue with application protocol until connection closes
 *     call sasl_getprop to get username
 *     call sasl_getprop/sasl_encode/sasl_decode() if using security layer
 *  7. call sasl_dispose(), may return to step 2
 *  8. call sasl_done() when program terminates
 *
 *************************************************
 * IMPORTANT NOTE: server realms / username syntax
 *
 * If a user name contains a "@", then the rightmost "@" in the user name
 * separates the account name from the realm in which this account is
 * located.  A single server may support multiple realms.  If the
 * server knows the realm at connection creation time (e.g., a server
 * with multiple IP addresses tightly binds one address to a specific
 * realm) then that realm must be passed in the user_realm field of
 * the sasl_server_new call.  If user_realm is non-empty and an
 * unqualified user name is supplied, then the canon_user facility is
 * expected to append "@" and user_realm to the user name.  The canon_user
 * facility may treat other characters such as "%" as equivalent to "@".
 *
 * If the server forbids the use of "@" in user names for other
 * purposes, this simplifies security validation.
 */

#ifndef SASL_H
#define SASL_H 1

#include <stddef.h>  /* For size_t */

/* Keep in sync with win32/common.mak */
#define SASL_VERSION_MAJOR 2
#define SASL_VERSION_MINOR 1
#define SASL_VERSION_STEP 27

/* A convenience macro: same as was defined in the OpenLDAP LDAPDB */
#define SASL_VERSION_FULL ((SASL_VERSION_MAJOR << 16) |\
      (SASL_VERSION_MINOR << 8) | SASL_VERSION_STEP)

#include "prop.h"

/*************
 * Basic API *
 *************/

/* SASL result codes: */
#define SASL_CONTINUE    1   /* another step is needed in authentication */
#define SASL_OK          0   /* successful result */
#define SASL_FAIL       -1   /* generic failure */
#define SASL_NOMEM      -2   /* memory shortage failure */
#define SASL_BUFOVER    -3   /* overflowed buffer */
#define SASL_NOMECH     -4   /* mechanism not supported */
#define SASL_BADPROT    -5   /* bad protocol / cancel */
#define SASL_NOTDONE    -6   /* can't request info until later in exchange */
#define SASL_BADPARAM   -7   /* invalid parameter supplied */
#define SASL_TRYAGAIN   -8   /* transient failure (e.g., weak key) */
#define SASL_BADMAC	-9   /* integrity check failed */
#define SASL_NOTINIT    -12  /* SASL library not initialized */
                             /* -- client only codes -- */
#define SASL_INTERACT    2   /* needs user interaction */
#define SASL_BADSERV    -10  /* server failed mutual authentication step */
#define SASL_WRONGMECH  -11  /* mechanism doesn't support requested feature */
                             /* -- server only codes -- */
#define SASL_BADAUTH    -13  /* authentication failure */
#define SASL_NOAUTHZ    -14  /* authorization failure */
#define SASL_TOOWEAK    -15  /* mechanism too weak for this user */
#define SASL_ENCRYPT    -16  /* encryption needed to use mechanism */
#define SASL_TRANS      -17  /* One time use of a plaintext password will
				enable requested mechanism for user */
#define SASL_EXPIRED    -18  /* passphrase expired, has to be reset */
#define SASL_DISABLED   -19  /* account disabled */
#define SASL_NOUSER     -20  /* user not found */
#define SASL_BADVERS    -23  /* version mismatch with plug-in */
#define SASL_UNAVAIL    -24  /* remote authentication server unavailable */
#define SASL_NOVERIFY   -26  /* user exists, but no verifier for user */
			     /* -- codes for password setting -- */
#define SASL_PWLOCK     -21  /* passphrase locked */
#define SASL_NOCHANGE   -22  /* requested change was not needed */
#define SASL_WEAKPASS   -27  /* passphrase is too weak for security policy */
#define SASL_NOUSERPASS -28  /* user supplied passwords not permitted */
#define SASL_NEED_OLD_PASSWD -29 /* sasl_setpass needs old password in order
				    to perform password change */
#define SASL_CONSTRAINT_VIOLAT	-30 /* a property can't be stored,
				       because of some constrains/policy violation */

#define SASL_BADBINDING -32  /* channel binding failure */
#define SASL_CONFIGERR  -100 /* error when parsing configuration file */

/* max size of a sasl mechanism name */
#define SASL_MECHNAMEMAX 20

#ifdef _WIN32
/* Define to have the same layout as a WSABUF */
#ifndef STRUCT_IOVEC_DEFINED
#define STRUCT_IOVEC_DEFINED 1
struct iovec {
    long iov_len;
    char *iov_base;
};
#endif
#else
struct iovec;				     /* Defined in OS headers */
#endif

/* per-connection SASL negotiation state for client or server
 */
typedef struct sasl_conn sasl_conn_t;

/* Plain text password structure.
 *  len is the length of the password, data is the text.
 */
typedef struct sasl_secret {
    unsigned long len;
    unsigned char data[1];		/* variable sized */
} sasl_secret_t;

/* random data context structure
 */
typedef struct sasl_rand_s sasl_rand_t;

#ifdef __cplusplus
extern "C" {
#endif

/****************************
 * Configure Basic Services *
 ****************************/

/* the following functions are used to adjust how allocation and mutexes work
 * they must be called before all other SASL functions:
 */

#include <sys/types.h>

/* memory allocation functions which may optionally be replaced:
 */
typedef void *sasl_malloc_t(size_t);
typedef void *sasl_calloc_t(size_t, size_t);
typedef void *sasl_realloc_t(void *, size_t);
typedef void sasl_free_t(void *);

LIBSASL_API void sasl_set_alloc(sasl_malloc_t *,
				sasl_calloc_t *,
				sasl_realloc_t *,
				sasl_free_t *);

/* mutex functions which may optionally be replaced:
 *  sasl_mutex_alloc allocates a mutex structure
 *  sasl_mutex_lock blocks until mutex locked
 *   returns -1 on deadlock or parameter error
 *   returns 0 on success
 *  sasl_mutex_unlock unlocks mutex if it's locked
 *   returns -1 if not locked or parameter error
 *   returns 0 on success
 *  sasl_mutex_free frees a mutex structure
 */
typedef void *sasl_mutex_alloc_t(void);
typedef int sasl_mutex_lock_t(void *mutex);
typedef int sasl_mutex_unlock_t(void *mutex);
typedef void sasl_mutex_free_t(void *mutex);
LIBSASL_API void sasl_set_mutex(sasl_mutex_alloc_t *, sasl_mutex_lock_t *,
				sasl_mutex_unlock_t *, sasl_mutex_free_t *);

/*****************************
 * Security preference types *
 *****************************/

/* security layer strength factor -- an unsigned integer usable by the caller
 *  to specify approximate security layer strength desired.  Roughly
 *  correlated to effective key length for encryption.
 * 0   = no protection
 * 1   = integrity protection only
 * 40  = 40-bit DES or 40-bit RC2/RC4
 * 56  = DES
 * 112 = triple-DES
 * 128 = 128-bit RC2/RC4/BLOWFISH
 * 256 = baseline AES
 */
typedef unsigned sasl_ssf_t;

/* usage flags provided to sasl_server_new and sasl_client_new:
 */
#define SASL_SUCCESS_DATA    0x0004 /* server supports data on success */
#define SASL_NEED_PROXY      0x0008 /* require a mech that allows proxying */
#define SASL_NEED_HTTP       0x0010 /* require a mech that can do HTTP auth */

/***************************
 * Security Property Types *
 ***************************/

/* Structure specifying the client or server's security policy
 * and optional additional properties.
 */

/* These are the various security flags apps can specify. */
/* NOPLAINTEXT          -- don't permit mechanisms susceptible to simple
 *                         passive attack (e.g., PLAIN, LOGIN)
 * NOACTIVE             -- protection from active (non-dictionary) attacks
 *                         during authentication exchange.
 *                         Authenticates server.
 * NODICTIONARY         -- don't permit mechanisms susceptible to passive
 *                         dictionary attack
 * FORWARD_SECRECY      -- require forward secrecy between sessions
 *                         (breaking one won't help break next)
 * NOANONYMOUS          -- don't permit mechanisms that allow anonymous login
 * PASS_CREDENTIALS     -- require mechanisms which pass client
 *			   credentials, and allow mechanisms which can pass
 *			   credentials to do so
 * MUTUAL_AUTH          -- require mechanisms which provide mutual
 *			   authentication
 */
#define SASL_SEC_NOPLAINTEXT      0x0001
#define SASL_SEC_NOACTIVE         0x0002
#define SASL_SEC_NODICTIONARY     0x0004
#define SASL_SEC_FORWARD_SECRECY  0x0008
#define SASL_SEC_NOANONYMOUS      0x0010
#define SASL_SEC_PASS_CREDENTIALS 0x0020
#define SASL_SEC_MUTUAL_AUTH      0x0040
#define SASL_SEC_MAXIMUM          0x00FF

typedef struct sasl_security_properties 
{ 
    /* security strength factor
     *  min_ssf      = minimum acceptable final level
     *  max_ssf      = maximum acceptable final level
     */ 
    sasl_ssf_t min_ssf;
    sasl_ssf_t max_ssf;

/* Maximum security layer receive buffer size.
     *  0=security layer not supported
     */
    unsigned maxbufsize; 
    
    /* bitfield for attacks to protect against */
    unsigned security_flags;

/* NULL terminated array of additional property names, values */ 
    const char **property_names;
    const char **property_values;
} sasl_security_properties_t;

/******************
 * Callback types *
 ******************/

/*
 * Extensible type for a client/server callbacks
 *  id      -- identifies callback type
 *  proc    -- procedure call arguments vary based on id
 *  context -- context passed to procedure
 */
/* Note that any memory that is allocated by the callback needs to be
 * freed by the application, be it via function call or interaction.
 *
 * It may be freed after sasl_*_step returns SASL_OK.  if the mechanism
 * requires this information to persist (for a security layer, for example)
 * it must maintain a private copy.
 */
typedef struct sasl_callback {
    /* Identifies the type of the callback function.
     * Mechanisms must ignore callbacks with id's they don't recognize.
     */
    unsigned long id;
    int (*proc)(void);   /* Callback function.  Types of arguments vary by 'id' */
    void *context;
} sasl_callback_t;

/* callback ids & functions:
 */
#define SASL_CB_LIST_END   0  /* end of list */

/* option reading callback -- this allows a SASL configuration to be
 *  encapsulated in the caller's configuration system.  Some implementations
 *  may use default config file(s) if this is omitted.  Configuration items
 *  may be plugin-specific and are arbitrary strings.
 *
 * inputs:
 *  context     -- option context from callback record
 *  plugin_name -- name of plugin (NULL = general SASL option)
 *  option      -- name of option
 * output:
 *  result      -- set to result which persists until next getopt in
 *                 same thread, unchanged if option not found
 *  len         -- length of result (may be NULL)
 * returns:
 *  SASL_OK     -- no error
 *  SASL_FAIL   -- error
 */
typedef int sasl_getopt_t(void *context, const char *plugin_name,
			  const char *option,
			  const char **result, unsigned *len);
#define SASL_CB_GETOPT       1

/* Logging levels for use with the logging callback function. */
#define SASL_LOG_NONE  0	/* don't log anything */
#define SASL_LOG_ERR   1	/* log unusual errors (default) */
#define SASL_LOG_FAIL  2	/* log all authentication failures */
#define SASL_LOG_WARN  3	/* log non-fatal warnings */
#define SASL_LOG_NOTE  4	/* more verbose than LOG_WARN */
#define SASL_LOG_DEBUG 5	/* more verbose than LOG_NOTE */
#define SASL_LOG_TRACE 6	/* traces of internal protocols */
#define SASL_LOG_PASS  7	/* traces of internal protocols, including
				 * passwords */

/* logging callback -- this allows plugins and the middleware to
 *  log operations they perform.
 * inputs:
 *  context     -- logging context from the callback record
 *  level       -- logging level; see above
 *  message     -- message to log
 * returns:
 *  SASL_OK     -- no error
 *  SASL_FAIL   -- error
 */
typedef int sasl_log_t(void *context,
		       int level,
		       const char *message);
#define SASL_CB_LOG	    2

/* getpath callback -- this allows applications to specify the
 * colon-separated path to search for plugins (by default,
 * taken from an implementation-specific location).
 * inputs:
 *  context     -- getpath context from the callback record
 * outputs:
 *  path	-- colon seperated path
 * returns:
 *  SASL_OK     -- no error
 *  SASL_FAIL   -- error
 */
typedef int sasl_getpath_t(void *context,
			   const char **path);

#define SASL_CB_GETPATH	    3

/* verify file callback -- this allows applications to check if they
 * want SASL to use files, file by file.  This is intended to allow
 * applications to sanity check the environment to make sure plugins
 * or the configuration file can't be written to, etc.
 * inputs: 
 *  context     -- verifypath context from the callback record
 *  file        -- full path to file to verify
 *  type        -- type of file to verify (see below)

* returns:
 *  SASL_OK        -- no error (file can safely be used)
 *  SASL_CONTINUE  -- continue WITHOUT using this file
 *  SASL_FAIL      -- error 
 */

/* these are the types of files libsasl will ask about */
typedef enum {
    SASL_VRFY_PLUGIN=0,		/* a DLL/shared library plug-in */
    SASL_VRFY_CONF=1,		/* a configuration file */
    SASL_VRFY_PASSWD=2,		/* a password storage file/db */
    SASL_VRFY_OTHER=3		/* some other file */
} sasl_verify_type_t;

typedef int sasl_verifyfile_t(void *context,
                              const char *file, sasl_verify_type_t type);
#define SASL_CB_VERIFYFILE  4

/* getconfpath callback -- this allows applications to specify the
 * colon-separated path to search for config files (by default,
 * taken from the SASL_CONF_PATH environment variable).
 * inputs:
 *  context     -- getconfpath context from the callback record
 * outputs:
 *  path        -- colon seperated path (allocated on the heap; the
 *                 library will free it using the sasl_free_t *
 *                 passed to sasl_set_callback, or the standard free()
 *                 library call).
 * returns:
 *  SASL_OK     -- no error
 *  SASL_FAIL   -- error
 */
typedef int sasl_getconfpath_t(void *context,
                               char **path);

#define SASL_CB_GETCONFPATH  5

/* client/user interaction callbacks:
 */
/* Simple prompt -- result must persist until next call to getsimple on
 *  same connection or until connection context is disposed
 * inputs:
 *  context       -- context from callback structure
 *  id            -- callback id
 * outputs:
 *  result        -- set to NUL terminated string
 *                   NULL = user cancel
 *  len           -- length of result
 * returns SASL_OK
 */
typedef int sasl_getsimple_t(void *context, int id,
			     const char **result, unsigned *len);
#define SASL_CB_USER         0x4001  /* client user identity to login as */
#define SASL_CB_AUTHNAME     0x4002  /* client authentication name */
#define SASL_CB_LANGUAGE     0x4003  /* comma separated list of RFC 1766
			              * language codes in order of preference
				      * to be used to localize client prompts
				      * or server error codes */
#define SASL_CB_CNONCE       0x4007  /* caller supplies client-nonce
				      * primarily for testing purposes */

/* get a sasl_secret_t (plaintext password with length)
 * inputs:
 *  conn          -- connection context
 *  context       -- context from callback structure
 *  id            -- callback id
 * outputs:
 *  psecret       -- set to NULL to cancel
 *                   set to password structure which must persist until
 *                   next call to getsecret in same connection, but middleware
 *                   will erase password data when it's done with it.
 * returns SASL_OK
 */
typedef int sasl_getsecret_t(sasl_conn_t *conn, void *context, int id,
			     sasl_secret_t **psecret);
#define SASL_CB_PASS         0x4004  /* client passphrase-based secret */

/* prompt for input in response to a challenge.
 * input:
 *  context   -- context from callback structure
 *  id        -- callback id
 *  challenge -- server challenge
 * output:
 *  result    -- NUL terminated result, NULL = user cancel
 *  len       -- length of result
 * returns SASL_OK
 */
typedef int sasl_chalprompt_t(void *context, int id,
			      const char *challenge,
			      const char *prompt, const char *defresult,
			      const char **result, unsigned *len);
#define SASL_CB_ECHOPROMPT   0x4005 /* challenge and client enterred result */
#define SASL_CB_NOECHOPROMPT 0x4006 /* challenge and client enterred result */

/* prompt (or autoselect) the realm to do authentication in.
 *  may get a list of valid realms.
 * input:
 *  context     -- context from callback structure
 *  id          -- callback id
 *  availrealms -- available realms; string list; NULL terminated
 *                 list may be empty.
 * output:
 *  result      -- NUL terminated realm; NULL is equivalent to ""
 * returns SASL_OK
 * result must persist until the next callback
 */
typedef int sasl_getrealm_t(void *context, int id,
			    const char **availrealms,
			    const char **result);
#define SASL_CB_GETREALM (0x4008) /* realm to attempt authentication in */

/* server callbacks:
 */

/* improved callback to verify authorization;
 *     canonicalization now handled elsewhere
 *  conn           -- connection context
 *  requested_user -- the identity/username to authorize (NUL terminated)
 *  rlen           -- length of requested_user
 *  auth_identity  -- the identity associated with the secret (NUL terminated)
 *  alen           -- length of auth_identity
 *  default_realm  -- default user realm, as passed to sasl_server_new if
 *  urlen          -- length of default realm
 *  propctx        -- auxiliary properties
 * returns SASL_OK on success,
 *         SASL_NOAUTHZ or other SASL response on failure
 */
typedef int sasl_authorize_t(sasl_conn_t *conn,
			     void *context,
			     const char *requested_user, unsigned rlen,
			     const char *auth_identity, unsigned alen,
			     const char *def_realm, unsigned urlen,
			     struct propctx *propctx);
#define SASL_CB_PROXY_POLICY 0x8001

/* functions for "userdb" based plugins to call to get/set passwords.
 * the location for the passwords is determined by the caller or middleware.
 * plug-ins may get passwords from other locations.
 */

/* callback to verify a plaintext password against the caller-supplied
 * user database.  This is necessary to allow additional <method>s for
 * encoding of the userPassword property.
 *  user          -- NUL terminated user name with user@realm syntax
 *  pass          -- password to check (may not be NUL terminated)
 *  passlen       -- length of password to check
 *  propctx       -- auxiliary properties for user
 */
typedef int sasl_server_userdb_checkpass_t(sasl_conn_t *conn,
					   void *context,
					   const char *user,
					   const char *pass,
					   unsigned passlen,
					   struct propctx *propctx);
#define SASL_CB_SERVER_USERDB_CHECKPASS (0x8005)

/* callback to store/change a plaintext password in the user database
 *  user          -- NUL terminated user name with user@realm syntax
 *  pass          -- password to store (may not be NUL terminated)
 *  passlen       -- length of password to store
 *  propctx       -- auxiliary properties (not stored)
 *  flags         -- see SASL_SET_* flags below (SASL_SET_CREATE optional)
 */
typedef int sasl_server_userdb_setpass_t(sasl_conn_t *conn,
					 void *context,
					 const char *user,
					 const char *pass,
					 unsigned passlen,
					 struct propctx *propctx,
					 unsigned flags);
#define SASL_CB_SERVER_USERDB_SETPASS (0x8006)

/* callback for a server-supplied user canonicalization function.
 *
 * This function is called directly after the mechanism has the
 * authentication and authorization IDs.  It is called before any
 * User Canonicalization plugin is called.  It has the responsibility
 * of copying its output into the provided output buffers.
 * 
 *  in, inlen     -- user name to canonicalize, may not be NUL terminated
 *                   may be same buffer as out
 *  flags         -- not currently used, supplied by auth mechanism
 *  user_realm    -- the user realm (may be NULL in case of client)
 *  out           -- buffer to copy user name
 *  out_max       -- max length of user name
 *  out_len       -- set to length of user name
 *
 * returns
 *  SASL_OK         on success
 *  SASL_BADPROT    username contains invalid character
 */

/* User Canonicalization Function Flags */

#define SASL_CU_NONE    0x00 /* Not a valid flag to pass */
/* One of the following two is required */
#define SASL_CU_AUTHID  0x01
#define SASL_CU_AUTHZID 0x02

/* Combine the following with SASL_CU_AUTHID, if you don't want
   to fail if auxprop returned SASL_NOUSER/SASL_NOMECH. */
#define SASL_CU_EXTERNALLY_VERIFIED 0x04

#define SASL_CU_OVERRIDE	    0x08    /* mapped to SASL_AUXPROP_OVERRIDE */

/* The following CU flags are passed "as is" down to auxprop lookup */
#define SASL_CU_ASIS_MASK	    0xFFF0
/* NOTE: Keep in sync with SASL_AUXPROP_<XXX> flags */
#define SASL_CU_VERIFY_AGAINST_HASH 0x10

typedef int sasl_canon_user_t(sasl_conn_t *conn,
			      void *context,
			      const char *in, unsigned inlen,
			      unsigned flags,
			      const char *user_realm,
			      char *out,
			      unsigned out_max, unsigned *out_len);

#define SASL_CB_CANON_USER (0x8007)

/**********************************
 * Common Client/server functions *
 **********************************/

/* Types of paths to set (see sasl_set_path below). */
#define SASL_PATH_TYPE_PLUGIN	0
#define SASL_PATH_TYPE_CONFIG	1

/* a simpler way to set plugin path or configuration file path
 * without the need to set sasl_getpath_t callback.
 *
 * This function can be called before sasl_server_init/sasl_client_init.
 */  
LIBSASL_API int sasl_set_path (int path_type, char * path);

/* get sasl library version information
 * implementation is a vendor-defined string
 * version is a vender-defined representation of the version #.
 *
 * This function is being deprecated in favor of sasl_version_info. */
LIBSASL_API void sasl_version(const char **implementation,
			      int *version);

/* Extended version of sasl_version().
 *
 * This function is to be used
 *  for library version display and logging
 *  for bug workarounds in old library versions
 *
 * The sasl_version_info is not to be used for API feature detection.
 *
 * All parameters are optional. If NULL is specified, the value is not returned.
 */
LIBSASL_API void sasl_version_info (const char **implementation,
				const char **version_string,
				int *version_major,
				int *version_minor,
				int *version_step,
				int *version_patch);

/* dispose of all SASL plugins.  Connection
 * states have to be disposed of before calling this.
 *
 * This function is DEPRECATED in favour of sasl_server_done/
 * sasl_client_done.
 */
LIBSASL_API void sasl_done(void);

/* dispose of all SASL plugins.  Connection
 * states have to be disposed of before calling this.
 * This function should be called instead of sasl_done(),
   whenever possible.
 */
LIBSASL_API int sasl_server_done(void);

/* dispose connection state, sets it to NULL
 *  checks for pointer to NULL
 */
LIBSASL_API void sasl_dispose(sasl_conn_t **pconn);

/* translate an error number into a string
 * input:
 *  saslerr  -- the error number
 *  langlist -- comma separated list of RFC 1766 languages (may be NULL)
 * results:
 *  outlang  -- the language actually used (may be NULL if don't care)
 * returns:
 *  the error message in UTF-8 (only the US-ASCII subset if langlist is NULL)
 */
LIBSASL_API const char *sasl_errstring(int saslerr,
				       const char *langlist,
				       const char **outlang);

/* get detail about the last error that occurred on a connection
 * text is sanitized so it's suitable to send over the wire
 * (e.g., no distinction between SASL_BADAUTH and SASL_NOUSER)
 * input:
 *  conn          -- mandatory connection context
 * returns:
 *  the error message in UTF-8 (only the US-ASCII subset permitted if no
 *  SASL_CB_LANGUAGE callback is present)
 */
LIBSASL_API const char *sasl_errdetail(sasl_conn_t *conn);

/* set the error string which will be returned by sasl_errdetail() using
 *  syslog()-style formatting (e.g. printf-style with %m as most recent
 *  errno error)
 *
 *  primarily for use by server callbacks such as the sasl_authorize_t
 *  callback and internally to plug-ins
 *
 * This will also trigger a call to the SASL logging callback (if any)
 * with a level of SASL_LOG_FAIL unless the SASL_NOLOG flag is set.
 *
 * Messages should be sensitive to the current language setting.  If there
 * is no SASL_CB_LANGUAGE callback messages MUST be US-ASCII otherwise UTF-8
 * is used and use of RFC 2482 for mixed-language text is encouraged.
 *
 * if conn is NULL, function does nothing
 */
LIBSASL_API void sasl_seterror(sasl_conn_t *conn, unsigned flags,
			       const char *fmt, ...);
#define SASL_NOLOG       0x01
			   
/* get property from SASL connection state
 *  propnum       -- property number
 *  pvalue        -- pointer to value
 * returns:
 *  SASL_OK       -- no error
 *  SASL_NOTDONE  -- property not available yet
 *  SASL_BADPARAM -- bad property number
 */
LIBSASL_API int sasl_getprop(sasl_conn_t *conn, int propnum,
			     const void **pvalue);
#define SASL_USERNAME     0	/* pointer to NUL terminated user name */
#define SASL_SSF          1	/* security layer security strength factor,
                                 * if 0, call to sasl_encode, sasl_decode
                                 * unnecessary */
#define SASL_MAXOUTBUF    2     /* security layer max output buf unsigned */  
#define SASL_DEFUSERREALM 3	/* default realm passed to server_new */
				/* or set with setprop */
#define SASL_GETOPTCTX    4	/* context for getopt callback */
#define SASL_CALLBACK     7	/* current callback function list */
#define SASL_IPLOCALPORT  8	/* iplocalport string passed to server_new */
#define SASL_IPREMOTEPORT 9	/* ipremoteport string passed to server_new */

/* This returns a string which is either empty or has an error message
 * from sasl_seterror (e.g., from a plug-in or callback).  It differs
 * from the result of sasl_errdetail() which also takes into account the
 * last return status code.
 */
#define SASL_PLUGERR     10

/* a handle to any delegated credentials or NULL if none is present 
 * is returned by the mechanism. The user will probably need to know
 * which mechanism was used to actually known how to make use of them
 * currently only implemented for the gssapi mechanism */
#define SASL_DELEGATEDCREDS 11

#define SASL_SERVICE      12	/* service passed to sasl_*_new */
#define SASL_SERVERFQDN   13	/* serverFQDN passed to sasl_*_new */
#define SASL_AUTHSOURCE   14	/* name of auth source last used, useful
				 * for failed authentication tracking */
#define SASL_MECHNAME     15    /* active mechanism name, if any */
#define SASL_AUTHUSER     16    /* authentication/admin user */
#define SASL_APPNAME	  17	/* application name (used for logging/
				   configuration), same as appname parameter
				   to sasl_server_init */

/* GSS-API credential handle for sasl_client_step() or sasl_server_step().
 * The application is responsible for releasing this credential handle. */
#define	SASL_GSS_CREDS	  18

/* GSS name (gss_name_t) of the peer, as output by gss_inquire_context()
 * or gss_accept_sec_context().
 * On server end this is similar to SASL_USERNAME, but the gss_name_t
 * structure can contain additional attributes associated with the peer.
 */
#define	SASL_GSS_PEER_NAME	19

/* Local GSS name (gss_name_t) as output by gss_inquire_context(). This
 * is particularly useful for servers that respond to multiple names. */
#define	SASL_GSS_LOCAL_NAME	20

/* Channel binding information. Memory is managed by the caller. */
typedef struct sasl_channel_binding {
    const char *name;
    int critical;
    unsigned long len;
    const unsigned char *data;
} sasl_channel_binding_t;

#define SASL_CHANNEL_BINDING    21

/* HTTP Request (RFC 2616) - ONLY used for HTTP Digest Auth (RFC 2617) */
typedef struct sasl_http_request {
    const char *method;			/* HTTP Method */
    const char *uri;			/* request-URI */
    const unsigned char *entity;	/* entity-body */
    unsigned long elen;			/* entity-body length */
    unsigned non_persist;		/* Is it a non-persistent connection? */
} sasl_http_request_t;

#define SASL_HTTP_REQUEST	22

/* set property in SASL connection state
 * returns:
 *  SASL_OK       -- value set
 *  SASL_BADPARAM -- invalid property or value
 */
LIBSASL_API int sasl_setprop(sasl_conn_t *conn,
			     int propnum,
			     const void *value);
#define SASL_SSF_EXTERNAL  100	/* external SSF active (sasl_ssf_t *) */
#define SASL_SEC_PROPS     101	/* sasl_security_properties_t */
#define SASL_AUTH_EXTERNAL 102	/* external authentication ID (const char *) */

/* If the SASL_AUTH_EXTERNAL value is non-NULL, then a special version of the
 * EXTERNAL mechanism is enabled (one for server-embedded EXTERNAL mechanisms).
 * Otherwise, the EXTERNAL mechanism will be absent unless a plug-in
 * including EXTERNAL is present.
 */

/* do precalculations during an idle period or network round trip
 *  may pass NULL to precompute for some mechanisms prior to connect
 *  returns 1 if action taken, 0 if no action taken
 */
LIBSASL_API int sasl_idle(sasl_conn_t *conn);

/**************
 * Client API *
 **************/

/* list of client interactions with user for caller to fill in
 */
typedef struct sasl_interact {
    unsigned long id;		/* same as client/user callback ID */
    const char *challenge;	/* presented to user (e.g. OTP challenge) */
    const char *prompt;		/* presented to user (e.g. "Username: ") */
    const char *defresult;	/* default result string */
    const void *result;		/* set to point to result */
    unsigned len;		/* set to length of result */
} sasl_interact_t;

/* initialize the SASL client drivers
 *  callbacks      -- base callbacks for all client connections;
 *                    must include getopt callback
 * returns:
 *  SASL_OK        -- Success
 *  SASL_NOMEM     -- Not enough memory
 *  SASL_BADVERS   -- Mechanism version mismatch
 *  SASL_BADPARAM  -- missing getopt callback or error in config file
 *  SASL_NOMECH    -- No mechanisms available
 *  ...
 */
LIBSASL_API int sasl_client_init(const sasl_callback_t *callbacks);

/* initialize a client exchange based on the specified mechanism
 *  service       -- registered name of the service using SASL (e.g. "imap")
 *  serverFQDN    -- the fully qualified domain name of the server
 *  iplocalport   -- client IPv4/IPv6 domain literal string with port
 *                    (if NULL, then mechanisms requiring IPaddr are disabled)
 *  ipremoteport  -- server IPv4/IPv6 domain literal string with port
 *                    (if NULL, then mechanisms requiring IPaddr are disabled)
 *  prompt_supp   -- list of client interactions supported
 *                   may also include sasl_getopt_t context & call
 *                   NULL prompt_supp = user/pass via SASL_INTERACT only
 *                   NULL proc = interaction supported via SASL_INTERACT
 *  flags         -- server usage flags (see above)
 * in/out:
 *  pconn         -- connection negotiation structure
 *                   pointer to NULL => allocate new
 *
 * Returns:
 *  SASL_OK       -- success
 *  SASL_NOMECH   -- no mechanism meets requested properties
 *  SASL_NOMEM    -- not enough memory
 */
LIBSASL_API int sasl_client_new(const char *service,
				const char *serverFQDN,
				const char *iplocalport,
				const char *ipremoteport,
				const sasl_callback_t *prompt_supp,
				unsigned flags,
				sasl_conn_t **pconn);

/* select a mechanism for a connection
 *  mechlist      -- mechanisms server has available (punctuation ignored)
 *                   if NULL, then discard cached info and retry last mech
 * output:
 *  prompt_need   -- on SASL_INTERACT, list of prompts needed to continue
 *                   may be NULL if callbacks provided
 *  clientout     -- the initial client response to send to the server
 *                   will be valid until next call to client_start/client_step
 *                   NULL if mech doesn't include initial client challenge
 *  mech          -- set to mechansm name of selected mechanism (may be NULL)
 *
 * Returns:
 *  SASL_OK       -- success
 *  SASL_NOMEM    -- not enough memory
 *  SASL_NOMECH   -- no mechanism meets requested properties
 *  SASL_INTERACT -- user interaction needed to fill in prompt_need list
 */
LIBSASL_API int sasl_client_start(sasl_conn_t *conn,
				  const char *mechlist,
				  sasl_interact_t **prompt_need,
				  const char **clientout,
				  unsigned *clientoutlen,
				  const char **mech);

/* do a single authentication step.
 *  serverin    -- the server message received by the client, MUST have a NUL
 *                 sentinel, not counted by serverinlen
 * output:
 *  prompt_need -- on SASL_INTERACT, list of prompts needed to continue
 *  clientout   -- the client response to send to the server
 *                 will be valid until next call to client_start/client_step
 *
 * returns:
 *  SASL_OK        -- success
 *  SASL_INTERACT  -- user interaction needed to fill in prompt_need list
 *  SASL_BADPROT   -- server protocol incorrect/cancelled
 *  SASL_BADSERV   -- server failed mutual auth
 */
LIBSASL_API int sasl_client_step(sasl_conn_t *conn,
				 const char *serverin,
				 unsigned serverinlen,
				 sasl_interact_t **prompt_need,
				 const char **clientout,
				 unsigned *clientoutlen);

/**************
 * Server API *
 **************/

/* initialize server drivers, done once per process
 *  callbacks      -- callbacks for all server connections; must include
 *                    getopt callback
 *  appname        -- name of calling application (for lower level logging)
 * results:
 *  state          -- server state
 * returns:
 *  SASL_OK        -- success
 *  SASL_BADPARAM  -- error in config file
 *  SASL_NOMEM     -- memory failure
 *  SASL_BADVERS   -- Mechanism version mismatch
 */
LIBSASL_API int sasl_server_init(const sasl_callback_t *callbacks,
				 const char *appname);

/* IP/port syntax:
 *  a.b.c.d;p              where a-d are 0-255 and p is 0-65535 port number.
 *  e:f:g:h:i:j:k:l;p      where e-l are 0000-ffff lower-case hexidecimal
 *  e:f:g:h:i:j:a.b.c.d;p  alternate syntax for previous
 *
 *  Note that one or more "0" fields in f-k can be replaced with "::"
 *  Thus:                 e:f:0000:0000:0000:j:k:l;p
 *  can be abbreviated:   e:f::j:k:l;p
 *
 * A buffer of size 52 is adequate for the longest format with NUL terminator.
 */

/* create context for a single SASL connection
 *  service        -- registered name of the service using SASL (e.g. "imap")
 *  serverFQDN     -- Fully qualified domain name of server.  NULL means use
 *                    gethostname() or equivalent.
 *                    Useful for multi-homed servers.
 *  user_realm     -- permits multiple user realms on server, NULL = default
 *  iplocalport    -- server IPv4/IPv6 domain literal string with port
 *                    (if NULL, then mechanisms requiring IPaddr are disabled)
 *  ipremoteport   -- client IPv4/IPv6 domain literal string with port
 *                    (if NULL, then mechanisms requiring IPaddr are disabled)
 *  callbacks      -- callbacks (e.g., authorization, lang, new getopt context)
 *  flags          -- usage flags (see above)
 * returns:
 *  pconn          -- new connection context
 *
 * returns:
 *  SASL_OK        -- success
 *  SASL_NOMEM     -- not enough memory
 */
LIBSASL_API int sasl_server_new(const char *service,
				const char *serverFQDN,
				const char *user_realm,
				const char *iplocalport,
				const char *ipremoteport,
				const sasl_callback_t *callbacks,
				unsigned flags,
				sasl_conn_t **pconn);

/* Return an array of NUL-terminated strings, terminated by a NULL pointer,
 * which lists all possible mechanisms that the library can supply
 *
 * Returns NULL on failure. */
LIBSASL_API const char ** sasl_global_listmech(void);

/* This returns a list of mechanisms in a NUL-terminated string
 *  conn          -- the connection to list mechanisms for (either client
 *                   or server)
 *  user          -- restricts mechanisms to those available to that user
 *                   (may be NULL, not used for client case)
 *  prefix        -- appended to beginning of result
 *  sep           -- appended between mechanisms
 *  suffix        -- appended to end of result
 * results:
 *  result        -- NUL terminated result which persists until next
 *                   call to sasl_listmech for this sasl_conn_t
 *  plen          -- gets length of result (excluding NUL), may be NULL
 *  pcount        -- gets number of mechanisms, may be NULL
 *
 * returns:
 *  SASL_OK        -- success
 *  SASL_NOMEM     -- not enough memory
 *  SASL_NOMECH    -- no enabled mechanisms
 */
LIBSASL_API int sasl_listmech(sasl_conn_t *conn,
			      const char *user,
			      const char *prefix,
			      const char *sep,
			      const char *suffix,
			      const char **result,
			      unsigned *plen,
			      int *pcount);

/* start a mechanism exchange within a connection context
 *  mech           -- the mechanism name client requested
 *  clientin       -- client initial response (NUL terminated), NULL if empty
 *  clientinlen    -- length of initial response
 *  serverout      -- initial server challenge, NULL if done 
 *                    (library handles freeing this string)
 *  serveroutlen   -- length of initial server challenge
 * output:
 *  pconn          -- the connection negotiation state on success
 *
 * Same returns as sasl_server_step() or
 * SASL_NOMECH if mechanism not available.
 */
LIBSASL_API int sasl_server_start(sasl_conn_t *conn,
				  const char *mech,
				  const char *clientin,
				  unsigned clientinlen,
				  const char **serverout,
				  unsigned *serveroutlen);

/* perform one step of the SASL exchange
 *  inputlen & input -- client data
 *                      NULL on first step if no optional client step
 *  outputlen & output -- set to the server data to transmit
 *                        to the client in the next step
 *                        (library handles freeing this)
 *
 * returns:
 *  SASL_OK        -- exchange is complete.
 *  SASL_CONTINUE  -- indicates another step is necessary.
 *  SASL_TRANS     -- entry for user exists, but not for mechanism
 *                    and transition is possible
 *  SASL_BADPARAM  -- service name needed
 *  SASL_BADPROT   -- invalid input from client
 *  ...
 */
LIBSASL_API int sasl_server_step(sasl_conn_t *conn,
				 const char *clientin,
				 unsigned clientinlen,
				 const char **serverout,
				 unsigned *serveroutlen);

/* check if an apop exchange is valid
 *  (note this is an optional part of the SASL API)
 *  if challenge is NULL, just check if APOP is enabled
 * inputs:
 *  challenge     -- challenge which was sent to client
 *  challen       -- length of challenge, 0 = strlen(challenge)
 *  response      -- client response, "<user> <digest>" (RFC 1939)
 *  resplen       -- length of response, 0 = strlen(response)
 * returns 
 *  SASL_OK       -- success
 *  SASL_BADAUTH  -- authentication failed
 *  SASL_BADPARAM -- missing challenge
 *  SASL_BADPROT  -- protocol error (e.g., response in wrong format)
 *  SASL_NOVERIFY -- user found, but no verifier
 *  SASL_NOMECH   -- mechanism not supported
 *  SASL_NOUSER   -- user not found
 */
LIBSASL_API int sasl_checkapop(sasl_conn_t *conn,
			       const char *challenge, unsigned challen,
			       const char *response, unsigned resplen);

/* check if a plaintext password is valid
 *   if user is NULL, check if plaintext passwords are enabled
 * inputs:
 *  user          -- user to query in current user_domain
 *  userlen       -- length of username, 0 = strlen(user)
 *  pass          -- plaintext password to check
 *  passlen       -- length of password, 0 = strlen(pass)
 * returns 
 *  SASL_OK       -- success
 *  SASL_NOMECH   -- mechanism not supported
 *  SASL_NOVERIFY -- user found, but no verifier
 *  SASL_NOUSER   -- user not found
 */
LIBSASL_API int sasl_checkpass(sasl_conn_t *conn,
			       const char *user, unsigned userlen,
			       const char *pass, unsigned passlen);

/* check if a user exists on server
 *  conn          -- connection context
 *  service       -- registered name of the service using SASL (e.g. "imap")
 *  user_realm    -- permits multiple user realms on server, NULL = default
 *  user          -- NUL terminated user name
 *
 * returns:
 *  SASL_OK       -- success
 *  SASL_DISABLED -- account disabled
 *  SASL_NOUSER   -- user not found
 *  SASL_NOVERIFY -- user found, but no usable mechanism
 *  SASL_NOMECH   -- no mechanisms enabled
 *  SASL_UNAVAIL  -- remote authentication server unavailable, try again later
 */
LIBSASL_API int sasl_user_exists(sasl_conn_t *conn,
				 const char *service,
				 const char *user_realm,
				 const char *user);

/* set the password for a user
 *  conn        -- SASL connection
 *  user        -- user name
 *  pass        -- plaintext password, may be NULL to remove user
 *  passlen     -- length of password, 0 = strlen(pass)
 *  oldpass     -- NULL will sometimes work
 *  oldpasslen  -- length of password, 0 = strlen(oldpass)
 *  flags       -- see flags below
 * 
 * returns:
 *  SASL_NOCHANGE  -- proper entry already exists
 *  SASL_NOMECH    -- no authdb supports password setting as configured
 *  SASL_NOVERIFY  -- user exists, but no settable password present
 *  SASL_DISABLED  -- account disabled
 *  SASL_PWLOCK    -- password locked
 *  SASL_WEAKPASS  -- password too weak for security policy
 *  SASL_NOUSERPASS -- user-supplied passwords not permitted
 *  SASL_FAIL      -- OS error
 *  SASL_BADPARAM  -- password too long
 *  SASL_OK        -- successful
 */
LIBSASL_API int sasl_setpass(sasl_conn_t *conn,
			     const char *user,
			     const char *pass, unsigned passlen,
			     const char *oldpass, unsigned oldpasslen,
			     unsigned flags);
#define SASL_SET_CREATE  0x01   /* create a new entry for user */
#define SASL_SET_DISABLE 0x02	/* disable user account */
#define SASL_SET_NOPLAIN 0x04	/* do not store secret in plain text */
#define SASL_SET_CURMECH_ONLY 0x08	/* set the mechanism specific password only.
					   fail if no current mechanism */

/*********************************************************
 * Auxiliary Property Support -- added by cjn 1999-09-29 *
 *********************************************************/

#define SASL_AUX_END      NULL	/* last auxiliary property */

#define SASL_AUX_ALL "*" /* A special flag to signal user deletion */

/* traditional Posix items (should be implemented on Posix systems) */
#define SASL_AUX_PASSWORD_PROP "userPassword" /* User Password */
#define SASL_AUX_PASSWORD "*" SASL_AUX_PASSWORD_PROP /* User Password (of authid) */
#define SASL_AUX_UIDNUM   "uidNumber"	/* UID number for the user */
#define SASL_AUX_GIDNUM   "gidNumber"	/* GID for the user */
#define SASL_AUX_FULLNAME "gecos"	/* full name of the user, unix-style */
#define SASL_AUX_HOMEDIR  "homeDirectory" /* home directory for user */
#define SASL_AUX_SHELL    "loginShell"	/* login shell for the user */

/* optional additional items (not necessarily implemented) */
/* single preferred mail address for user canonically-quoted
 * RFC821/822 syntax */
#define SASL_AUX_MAILADDR "mail"
/* path to unix-style mailbox for user */
#define SASL_AUX_UNIXMBX  "mailMessageStore"
/* SMTP mail channel name to use if user authenticates successfully */
#define SASL_AUX_MAILCHAN "mailSMTPSubmitChannel"

/* Request a set of auxiliary properties
 *  conn         connection context
 *  propnames    list of auxiliary property names to request ending with
 *               NULL.  
 *
 * Subsequent calls will add items to the request list.  Call with NULL
 * to clear the request list.
 *
 * errors
 *  SASL_OK       -- success
 *  SASL_BADPARAM -- bad count/conn parameter
 *  SASL_NOMEM    -- out of memory
 */
LIBSASL_API int sasl_auxprop_request(sasl_conn_t *conn,
				     const char **propnames);

/* Returns current auxiliary property context.
 * Use functions in prop.h to access content
 *
 *  if authentication hasn't completed, property values may be empty/NULL
 *
 *  properties not recognized by active plug-ins will be left empty/NULL
 *
 *  returns NULL if conn is invalid.
 */
LIBSASL_API struct propctx *sasl_auxprop_getctx(sasl_conn_t *conn);

/* Store the set of auxiliary properties for the given user.
 * Use functions in prop.h to set the content.
 *
 *  conn         connection context
 *  ctx          property context from prop_new()/prop_request()/prop_set()
 *  user         NUL terminated user
 *
 * Call with NULL 'ctx' to see if the backend allows storing properties.
 *
 * errors
 *  SASL_OK       -- success
 *  SASL_NOMECH   -- can not store some/all properties
 *  SASL_BADPARAM -- bad conn/ctx/user parameter
 *  SASL_NOMEM    -- out of memory
 *  SASL_FAIL     -- failed to store
 */
LIBSASL_API int sasl_auxprop_store(sasl_conn_t *conn,
				   struct propctx *ctx, const char *user);

/**********************
 * security layer API *
 **********************/

/* encode a block of data for transmission using security layer,
 *  returning the input buffer if there is no security layer.
 *  output is only valid until next call to sasl_encode or sasl_encodev
 * returns:
 *  SASL_OK      -- success (returns input if no layer negotiated)
 *  SASL_NOTDONE -- security layer negotiation not finished
 *  SASL_BADPARAM -- inputlen is greater than the SASL_MAXOUTBUF
 */
LIBSASL_API int sasl_encode(sasl_conn_t *conn,
			    const char *input, unsigned inputlen,
			    const char **output, unsigned *outputlen);

/* encode a block of data for transmission using security layer
 *  output is only valid until next call to sasl_encode or sasl_encodev
 * returns:
 *  SASL_OK      -- success (returns input if no layer negotiated)
 *  SASL_NOTDONE -- security layer negotiation not finished
 *  SASL_BADPARAM -- input length is greater than the SASL_MAXOUTBUF
 *		     or no security layer
 */
LIBSASL_API int sasl_encodev(sasl_conn_t *conn,
			     const struct iovec *invec, unsigned numiov,
			     const char **output, unsigned *outputlen);

/* decode a block of data received using security layer
 *  returning the input buffer if there is no security layer.
 *  output is only valid until next call to sasl_decode
 *
 *  if outputlen is 0 on return, than the value of output is undefined.
 *  
 * returns:
 *  SASL_OK      -- success (returns input if no layer negotiated)
 *  SASL_NOTDONE -- security layer negotiation not finished
 *  SASL_BADMAC  -- bad message integrity check
 */
LIBSASL_API int sasl_decode(sasl_conn_t *conn,
			    const char *input, unsigned inputlen,
			    const char **output, unsigned *outputlen);

#ifdef __cplusplus
}
#endif

#endif /* SASL_H */

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