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authorJung-uk Kim <jkim@FreeBSD.org>2020-02-21 00:33:21 +0000
committerJung-uk Kim <jkim@FreeBSD.org>2020-02-21 00:33:21 +0000
commit6b4382c4054d7c169c6140feaa144ca360a90ead (patch)
tree176bf7fdbae226099058e11e9a429805b6e0af42 /secure/lib/libcrypto/man/man3/CMS_verify.3
parent24722aacdb06a5ac6780beef7db856a0f99095c3 (diff)
downloadsrc-6b4382c4054d7c169c6140feaa144ca360a90ead.tar.gz
src-6b4382c4054d7c169c6140feaa144ca360a90ead.zip
MFC: r356963
Install man5 and man7 for OpenSSL.
Notes
Notes: svn path=/stable/12/; revision=358188
Diffstat (limited to 'secure/lib/libcrypto/man/man3/CMS_verify.3')
-rw-r--r--secure/lib/libcrypto/man/man3/CMS_verify.3261
1 files changed, 261 insertions, 0 deletions
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+.rm #[ #] #H #V #F C
+.\" ========================================================================
+.\"
+.IX Title "CMS_VERIFY 3"
+.TH CMS_VERIFY 3 "2019-09-10" "1.1.1d" "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 verifies a \s-1CMS\s0 SignedData structure. \fBcms\fR is the CMS_ContentInfo
+structure to verify. \fBcerts\fR is a set of certificates in which to search for
+the signing certificate(s). \fBstore\fR is a trusted certificate store used for
+chain verification. \fBindata\fR is the detached content if the content is not
+present in \fBcms\fR. The content is written to \fBout\fR if it is not \s-1NULL.\s0
+.PP
+\&\fBflags\fR is an optional set of flags, which can be used to modify the verify
+operation.
+.PP
+\&\fBCMS_get0_signers()\fR retrieves the signing certificate(s) from \fBcms\fR, it must
+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 \fBcms\fR. The type of \fBcms\fR must
+be SignedData. There must be at least one signature on the data and if
+the content is detached \fBindata\fR cannot be \fB\s-1NULL\s0\fR.
+.PP
+An attempt is made to locate all the signing certificate(s), first looking in
+the \fBcerts\fR parameter (if it is not \s-1NULL\s0) and then looking in any
+certificates contained in the \fBcms\fR structure itself. If any signing
+certificate cannot be located the operation fails.
+.PP
+Each signing certificate is chain verified using the \fBsmimesign\fR purpose and
+the supplied trusted certificate store. Any internal certificates in the message
+are used as untrusted CAs. If \s-1CRL\s0 checking is enabled in \fBstore\fR any internal
+CRLs are used in addition to attempting to look them up in \fBstore\fR. If any
+chain verify fails an error code is returned.
+.PP
+Finally the signed content is read (and written to \fBout\fR if it is not \s-1NULL\s0)
+and the signature's checked.
+.PP
+If all signature's verify correctly then the function is successful.
+.PP
+Any of the following flags (ored together) can be passed in the \fBflags\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 \fBcerts\fR parameter.
+.PP
+If \fB\s-1CMS_NOCRL\s0\fR is set and \s-1CRL\s0 checking is enabled in \fBstore\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
+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 \fBcerts\fR parameter. In this case if the signer is not one of the
+certificates supplied in \fBcerts\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 signers 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 \fBout\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 zero 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"
+\&\fBERR_get_error\fR\|(3), \fBCMS_sign\fR\|(3)
+.SH "COPYRIGHT"
+.IX Header "COPYRIGHT"
+Copyright 2008\-2019 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>.