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Diffstat (limited to 'secure/lib/libcrypto/man/CMS_verify.3')
| -rw-r--r-- | secure/lib/libcrypto/man/CMS_verify.3 | 255 |
1 files changed, 255 insertions, 0 deletions
diff --git a/secure/lib/libcrypto/man/CMS_verify.3 b/secure/lib/libcrypto/man/CMS_verify.3 new file mode 100644 index 0000000..52a45cd --- /dev/null +++ b/secure/lib/libcrypto/man/CMS_verify.3 @@ -0,0 +1,255 @@ +.\" Automatically generated by Pod::Man 2.28 (Pod::Simple 3.28) +.\" +.\" 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" +\&\fICMS_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 +\&\fICMS_get0_signers()\fR retrieves the signing certificate(s) from \fBcms\fR, it must +be called after a successful \fICMS_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 is 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" +\&\fICMS_verify()\fR returns 1 for a successful verification and zero if an error +occurred. +.PP +\&\fICMS_get0_signers()\fR returns all signers or \s-1NULL\s0 if an error occurred. +.PP +The error can be obtained from \fIERR_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" +\&\fIERR_get_error\fR\|(3), \fICMS_sign\fR\|(3) +.SH "HISTORY" +.IX Header "HISTORY" +\&\fICMS_verify()\fR was added to OpenSSL 0.9.8 |
