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Edit File : CMS_get0_signers.3 \| Size : 10.11 KB
.\" Automatically generated by Pod::Man 4.11 (Pod::Simple 3.35) .\" .\" Standard preamble: .\" ======================================================================== .de Sp \" Vertical space (when we can't use .PP) .if t .sp .5v .if n .sp .. .de Vb \" Begin verbatim text .ft CW .nf .ne \\$1 .. .de Ve \" End verbatim text .ft R .fi .. .\" Set up some character translations and predefined strings. \(-- will .\" give an unbreakable dash, \(PI will give pi, \(L" will give a left .\" double quote, and \(R" will give a right double quote. \(C+ will .\" give a nicer C++. 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Always turn off hyphenation; it makes .\" way too many mistakes in technical documents. .if n .ad l .nh .SH "NAME" CMS_verify, CMS_get0_signers \- verify a CMS SignedData structure .SH "SYNOPSIS" .IX Header "SYNOPSIS" .Vb 1 \& #include <openssl/cms.h> \& \& int CMS_verify(CMS_ContentInfo cms, STACK_OF(X509) certs, X509_STORE store, \& BIO indata, BIO out, unsigned int flags); \& \& STACK_OF(X509) CMS_get0_signers(CMS_ContentInfo cms); .Ve .SH "DESCRIPTION" .IX Header "DESCRIPTION" \&\fBCMS_verify()\fR is very similar to \fBPKCS7_verify\fR\\|(3). It verifies a \&\fB\s-1CMS\s0 SignedData\fR structure contained in a structure of type \fBCMS_ContentInfo\fR. \&\fIcms\fR points to the \fBCMS_ContentInfo\fR structure to verify. The optional \fIcerts\fR parameter refers to a set of certificates in which to search for signing certificates. \&\fIcms\fR may contain extra untrusted \s-1CA\s0 certificates that may be used for chain building as well as CRLs that may be used for certificate validation. \&\fIstore\fR may be \s-1NULL\s0 or point to the trusted certificate store to use for chain verification. \&\fIindata\fR refers to the signed data if the content is detached from \fIcms\fR. Otherwise \fIindata\fR should be \s-1NULL\s0 and the signed data must be in \fIcms\fR. The content is written to the \s-1BIO\s0 \fIout\fR unless it is \s-1NULL.\s0 \&\fIflags\fR is an optional set of flags, which can be used to modify the operation. .PP \&\fBCMS_get0_signers()\fR retrieves the signing certificate(s) from \fIcms\fR, it may only be called after a successful \fBCMS_verify()\fR operation. .SH "VERIFY PROCESS" .IX Header "VERIFY PROCESS" Normally the verify process proceeds as follows. .PP Initially some sanity checks are performed on \fIcms\fR. The type of \fIcms\fR must be SignedData. There must be at least one signature on the data and if the content is detached \fIindata\fR cannot be \s-1NULL.\s0 .PP An attempt is made to locate all the signing certificate(s), first looking in the \fIcerts\fR parameter (if it is not \s-1NULL\s0) and then looking in any certificates contained in the \fIcms\fR structure unless \fB\s-1CMS_NOINTERN\s0\fR is set. If any signing certificate cannot be located the operation fails. .PP Each signing certificate is chain verified using the \fIsmimesign\fR purpose and using the trusted certificate store \fIstore\fR if supplied. Any internal certificates in the message, which may have been added using \&\fBCMS_add1_cert\fR\\|(3), are used as untrusted CAs. If \s-1CRL\s0 checking is enabled in \fIstore\fR and \fB\s-1CMS_NOCRL\s0\fR is not set, any internal CRLs, which may have been added using \fBCMS_add1_crl\fR\\|(3), are used in addition to attempting to look them up in \fIstore\fR. If \fIstore\fR is not \s-1NULL\s0 and any chain verify fails an error code is returned. .PP Finally the signed content is read (and written to \fIout\fR unless it is \s-1NULL\s0) and the signature is checked. .PP If all signatures verify correctly then the function is successful. .PP Any of the following flags (ored together) can be passed in the \fIflags\fR parameter to change the default verify behaviour. .PP If \fB\s-1CMS_NOINTERN\s0\fR is set the certificates in the message itself are not searched when locating the signing certificate(s). This means that all the signing certificates must be in the \fIcerts\fR parameter. .PP If \fB\s-1CMS_NOCRL\s0\fR is set and \s-1CRL\s0 checking is enabled in \fIstore\fR then any CRLs in the message itself are ignored. .PP If the \fB\s-1CMS_TEXT\s0\fR flag is set \s-1MIME\s0 headers for type \fBtext/plain\fR are deleted from the content. If the content is not of type \fBtext/plain\fR then an error is returned. .PP If \fB\s-1CMS_NO_SIGNER_CERT_VERIFY\s0\fR is set the signing certificates are not chain verified. .PP If \fB\s-1CMS_NO_ATTR_VERIFY\s0\fR is set the signed attributes signature is not verified. .PP If \fB\s-1CMS_NO_CONTENT_VERIFY\s0\fR is set then the content digest is not checked. .SH "NOTES" .IX Header "NOTES" One application of \fB\s-1CMS_NOINTERN\s0\fR is to only accept messages signed by a small number of certificates. The acceptable certificates would be passed in the \fIcerts\fR parameter. In this case if the signer certificate is not one of the certificates supplied in \fIcerts\fR then the verify will fail because the signer cannot be found. .PP In some cases the standard techniques for looking up and validating certificates are not appropriate: for example an application may wish to lookup certificates in a database or perform customised verification. This can be achieved by setting and verifying the signer certificates manually using the signed data utility functions. .PP Care should be taken when modifying the default verify behaviour, for example setting \fB\s-1CMS_NO_CONTENT_VERIFY\s0\fR will totally disable all content verification and any modified content will be considered valid. This combination is however useful if one merely wishes to write the content to \fIout\fR and its validity is not considered important. .PP Chain verification should arguably be performed using the signing time rather than the current time. However, since the signing time is supplied by the signer it cannot be trusted without additional evidence (such as a trusted timestamp). .SH "RETURN VALUES" .IX Header "RETURN VALUES" \&\fBCMS_verify()\fR returns 1 for a successful verification and 0 if an error occurred. .PP \&\fBCMS_get0_signers()\fR returns all signers or \s-1NULL\s0 if an error occurred. .PP The error can be obtained from \fBERR_get_error\fR\\|(3) .SH "BUGS" .IX Header "BUGS" The trusted certificate store is not searched for the signing certificate. This is primarily due to the inadequacies of the current \fBX509_STORE\fR functionality. .PP The lack of single pass processing means that the signed content must all be held in memory if it is not detached. .SH "SEE ALSO" .IX Header "SEE ALSO" \&\fBPKCS7_verify\fR\\|(3), \fBCMS_add1_cert\fR\\|(3), \fBCMS_add1_crl\fR\\|(3), \&\fBOSSL_ESS_check_signing_certs\fR\\|(3), \&\fBERR_get_error\fR\\|(3), \fBCMS_sign\fR\\|(3) .SH "COPYRIGHT" .IX Header "COPYRIGHT" Copyright 2008\-2022 The OpenSSL Project Authors. All Rights Reserved. .PP Licensed under the OpenSSL license (the \(L"License\(R"). You may not use this file except in compliance with the License. You can obtain a copy in the file \s-1LICENSE\s0 in the source distribution or at <https://www.openssl.org/source/license.html>. Back

Edit File : CMS_get0_signers.3 | Size : 10.11 KB

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.rm #[ #] #H #V #F C
.\" ========================================================================
.\"
.IX Title "CMS_VERIFY 3"
.TH CMS_VERIFY 3 "2023-09-11" "1.1.1w" "OpenSSL"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
.if n .ad l
.nh
.SH "NAME"
CMS_verify, CMS_get0_signers \- verify a CMS SignedData structure
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\& #include <openssl/cms.h>
\&
\& int CMS_verify(CMS_ContentInfo *cms, STACK_OF(X509) *certs, X509_STORE *store,
\&                BIO *indata, BIO *out, unsigned int flags);
\&
\& STACK_OF(X509) *CMS_get0_signers(CMS_ContentInfo *cms);
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
\&\fBCMS_verify()\fR is very similar to \fBPKCS7_verify\fR\|(3). It verifies a
\&\fB\s-1CMS\s0 SignedData\fR structure contained in a structure of type \fBCMS_ContentInfo\fR.
\&\fIcms\fR points to the \fBCMS_ContentInfo\fR structure to verify.
The optional \fIcerts\fR parameter refers to a set of certificates
in which to search for signing certificates.
\&\fIcms\fR may contain extra untrusted \s-1CA\s0 certificates that may be used for
chain building as well as CRLs that may be used for certificate validation.
\&\fIstore\fR may be \s-1NULL\s0 or point to
the trusted certificate store to use for chain verification.
\&\fIindata\fR refers to the signed data if the content is detached from \fIcms\fR.
Otherwise \fIindata\fR should be \s-1NULL\s0 and the signed data must be in \fIcms\fR.
The content is written to the \s-1BIO\s0 \fIout\fR unless it is \s-1NULL.\s0
\&\fIflags\fR is an optional set of flags, which can be used to modify the operation.
.PP
\&\fBCMS_get0_signers()\fR retrieves the signing certificate(s) from \fIcms\fR, it may only
be called after a successful \fBCMS_verify()\fR operation.
.SH "VERIFY PROCESS"
.IX Header "VERIFY PROCESS"
Normally the verify process proceeds as follows.
.PP
Initially some sanity checks are performed on \fIcms\fR. The type of \fIcms\fR must
be SignedData. There must be at least one signature on the data and if
the content is detached \fIindata\fR cannot be \s-1NULL.\s0
.PP
An attempt is made to locate all the signing certificate(s), first looking in
the \fIcerts\fR parameter (if it is not \s-1NULL\s0) and then looking in any
certificates contained in the \fIcms\fR structure unless \fB\s-1CMS_NOINTERN\s0\fR is set.
If any signing certificate cannot be located the operation fails.
.PP
Each signing certificate is chain verified using the \fIsmimesign\fR purpose and
using the trusted certificate store \fIstore\fR if supplied.
Any internal certificates in the message, which may have been added using
\&\fBCMS_add1_cert\fR\|(3), are used as untrusted CAs.
If \s-1CRL\s0 checking is enabled in \fIstore\fR and \fB\s-1CMS_NOCRL\s0\fR is not set,
any internal CRLs, which may have been added using \fBCMS_add1_crl\fR\|(3),
are used in addition to attempting to look them up in \fIstore\fR.
If \fIstore\fR is not \s-1NULL\s0 and any chain verify fails an error code is returned.
.PP
Finally the signed content is read (and written to \fIout\fR unless it is \s-1NULL\s0)
and the signature is checked.
.PP
If all signatures verify correctly then the function is successful.
.PP
Any of the following flags (ored together) can be passed in the \fIflags\fR
parameter to change the default verify behaviour.
.PP
If \fB\s-1CMS_NOINTERN\s0\fR is set the certificates in the message itself are not
searched when locating the signing certificate(s).
This means that all the signing certificates must be in the \fIcerts\fR parameter.
.PP
If \fB\s-1CMS_NOCRL\s0\fR is set and \s-1CRL\s0 checking is enabled in \fIstore\fR then any
CRLs in the message itself are ignored.
.PP
If the \fB\s-1CMS_TEXT\s0\fR flag is set \s-1MIME\s0 headers for type \fBtext/plain\fR are deleted
from the content. If the content is not of type \fBtext/plain\fR then an error is
returned.
.PP
If \fB\s-1CMS_NO_SIGNER_CERT_VERIFY\s0\fR is set the signing certificates are not
chain verified.
.PP
If \fB\s-1CMS_NO_ATTR_VERIFY\s0\fR is set the signed attributes signature is not
verified.
.PP
If \fB\s-1CMS_NO_CONTENT_VERIFY\s0\fR is set then the content digest is not checked.
.SH "NOTES"
.IX Header "NOTES"
One application of \fB\s-1CMS_NOINTERN\s0\fR is to only accept messages signed by
a small number of certificates. The acceptable certificates would be passed
in the \fIcerts\fR parameter. In this case if the signer certificate is not one
of the certificates supplied in \fIcerts\fR then the verify will fail because the
signer cannot be found.
.PP
In some cases the standard techniques for looking up and validating
certificates are not appropriate: for example an application may wish to
lookup certificates in a database or perform customised verification. This
can be achieved by setting and verifying the signer certificates manually
using the signed data utility functions.
.PP
Care should be taken when modifying the default verify behaviour, for example
setting \fB\s-1CMS_NO_CONTENT_VERIFY\s0\fR will totally disable all content verification
and any modified content will be considered valid. This combination is however
useful if one merely wishes to write the content to \fIout\fR and its validity
is not considered important.
.PP
Chain verification should arguably be performed using the signing time rather
than the current time. However, since the signing time is supplied by the
signer it cannot be trusted without additional evidence (such as a trusted
timestamp).
.SH "RETURN VALUES"
.IX Header "RETURN VALUES"
\&\fBCMS_verify()\fR returns 1 for a successful verification and 0 if an error occurred.
.PP
\&\fBCMS_get0_signers()\fR returns all signers or \s-1NULL\s0 if an error occurred.
.PP
The error can be obtained from \fBERR_get_error\fR\|(3)
.SH "BUGS"
.IX Header "BUGS"
The trusted certificate store is not searched for the signing certificate.
This is primarily due to the inadequacies of the current \fBX509_STORE\fR
functionality.
.PP
The lack of single pass processing means that the signed content must all
be held in memory if it is not detached.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fBPKCS7_verify\fR\|(3), \fBCMS_add1_cert\fR\|(3), \fBCMS_add1_crl\fR\|(3),
\&\fBOSSL_ESS_check_signing_certs\fR\|(3),
\&\fBERR_get_error\fR\|(3), \fBCMS_sign\fR\|(3)
.SH "COPYRIGHT"
.IX Header "COPYRIGHT"
Copyright 2008\-2022 The OpenSSL Project Authors. All Rights Reserved.
.PP
Licensed under the OpenSSL license (the \*(L"License\*(R").  You may not use
this file except in compliance with the License.  You can obtain a copy
in the file \s-1LICENSE\s0 in the source distribution or at
<https://www.openssl.org/source/license.html>.

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