271 lines
10 KiB
Plaintext
271 lines
10 KiB
Plaintext
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.\" ========================================================================
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.\"
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.IX Title "PKCS7_VERIFY 3ossl"
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.TH PKCS7_VERIFY 3ossl "2024-01-30" "3.2.1" "OpenSSL"
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.\" For nroff, turn off justification. Always turn off hyphenation; it makes
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.\" way too many mistakes in technical documents.
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.if n .ad l
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.nh
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.SH "NAME"
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PKCS7_verify, PKCS7_get0_signers \- verify a PKCS#7 signedData structure
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.SH "SYNOPSIS"
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.IX Header "SYNOPSIS"
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.Vb 1
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\& #include <openssl/pkcs7.h>
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\&
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\& int PKCS7_verify(PKCS7 *p7, STACK_OF(X509) *certs, X509_STORE *store,
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\& BIO *indata, BIO *out, int flags);
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\&
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\& STACK_OF(X509) *PKCS7_get0_signers(PKCS7 *p7, STACK_OF(X509) *certs, int flags);
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.Ve
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.SH "DESCRIPTION"
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.IX Header "DESCRIPTION"
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\&\fIPKCS7_verify()\fR is very similar to \fICMS_verify\fR\|(3).
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It verifies a PKCS#7 signedData structure given in \fIp7\fR.
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The optional \fIcerts\fR parameter refers to a set of certificates
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in which to search for signer's certificates.
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\&\fIp7\fR may contain extra untrusted \s-1CA\s0 certificates that may be used for
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chain building as well as CRLs that may be used for certificate validation.
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\&\fIstore\fR may be \s-1NULL\s0 or point to
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the trusted certificate store to use for chain verification.
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\&\fIindata\fR refers to the signed data if the content is detached from \fIp7\fR.
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Otherwise \fIindata\fR should be \s-1NULL,\s0 and then the signed data must be in \fIp7\fR.
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The content is written to the \s-1BIO \s0\fIout\fR unless it is \s-1NULL.
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\&\s0\fIflags\fR is an optional set of flags, which can be used to modify the operation.
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.PP
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\&\fIPKCS7_get0_signers()\fR retrieves the signer's certificates from \fIp7\fR, it does
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\&\fBnot\fR check their validity or whether any signatures are valid. The \fIcerts\fR
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and \fIflags\fR parameters have the same meanings as in \fIPKCS7_verify()\fR.
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.SH "VERIFY PROCESS"
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.IX Header "VERIFY PROCESS"
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Normally the verify process proceeds as follows.
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.PP
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Initially some sanity checks are performed on \fIp7\fR. The type of \fIp7\fR must
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be SignedData. There must be at least one signature on the data and if
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the content is detached \fIindata\fR cannot be \s-1NULL. \s0 If the content is
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not detached and \fIindata\fR is not \s-1NULL\s0 then the structure has both
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embedded and external content. To treat this as an error, use the flag
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\&\fB\s-1PKCS7_NO_DUAL_CONTENT\s0\fR.
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The default behavior allows this, for compatibility with older
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versions of OpenSSL.
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.PP
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An attempt is made to locate all the signer's certificates, first looking in
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the \fIcerts\fR parameter (if it is not \s-1NULL\s0). Then they are looked up in any
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certificates contained in the \fIp7\fR structure unless \fB\s-1PKCS7_NOINTERN\s0\fR is set.
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If any signer's certificates cannot be located the operation fails.
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.PP
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Each signer's certificate is chain verified using the \fBsmimesign\fR purpose and
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using the trusted certificate store \fIstore\fR if supplied.
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Any internal certificates in the message, which may have been added using
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\&\fIPKCS7_add_certificate\fR\|(3), are used as untrusted CAs unless \fB\s-1PKCS7_NOCHAIN\s0\fR
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is set.
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If \s-1CRL\s0 checking is enabled in \fIstore\fR and \fB\s-1PKCS7_NOCRL\s0\fR is not set,
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any internal CRLs, which may have been added using \fIPKCS7_add_crl\fR\|(3),
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are used in addition to attempting to look them up in \fIstore\fR.
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If \fIstore\fR is not \s-1NULL\s0 and any chain verify fails an error code is returned.
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.PP
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Finally the signed content is read (and written to \fIout\fR unless it is \s-1NULL\s0)
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and the signature is checked.
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.PP
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If all signatures verify correctly then the function is successful.
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.PP
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Any of the following flags (ored together) can be passed in the \fIflags\fR
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parameter to change the default verify behaviour.
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Only the flag \fB\s-1PKCS7_NOINTERN\s0\fR is meaningful to \fIPKCS7_get0_signers()\fR.
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.PP
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If \fB\s-1PKCS7_NOINTERN\s0\fR is set the certificates in the message itself are not
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searched when locating the signer's certificates.
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This means that all the signer's certificates must be in the \fIcerts\fR parameter.
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.PP
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If \fB\s-1PKCS7_NOCRL\s0\fR is set and \s-1CRL\s0 checking is enabled in \fIstore\fR then any
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CRLs in the message itself are ignored.
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.PP
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If the \fB\s-1PKCS7_TEXT\s0\fR flag is set \s-1MIME\s0 headers for type \f(CW\*(C`text/plain\*(C'\fR are deleted
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from the content. If the content is not of type \f(CW\*(C`text/plain\*(C'\fR then an error is
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returned.
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.PP
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If \fB\s-1PKCS7_NOVERIFY\s0\fR is set the signer's certificates are not chain verified.
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.PP
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If \fB\s-1PKCS7_NOCHAIN\s0\fR is set then the certificates contained in the message are
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not used as untrusted CAs. This means that the whole verify chain (apart from
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the signer's certificates) must be contained in the trusted store.
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.PP
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If \fB\s-1PKCS7_NOSIGS\s0\fR is set then the signatures on the data are not checked.
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.SH "NOTES"
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.IX Header "NOTES"
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One application of \fB\s-1PKCS7_NOINTERN\s0\fR is to only accept messages signed by
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a small number of certificates. The acceptable certificates would be passed
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in the \fIcerts\fR parameter. In this case if the signer's certificate is not one
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of the certificates supplied in \fIcerts\fR then the verify will fail because the
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signer cannot be found.
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.PP
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Care should be taken when modifying the default verify behaviour, for example
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setting \f(CW\*(C`PKCS7_NOVERIFY|PKCS7_NOSIGS\*(C'\fR will totally disable all verification
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and any signed message will be considered valid. This combination is however
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useful if one merely wishes to write the content to \fIout\fR and its validity
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is not considered important.
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.PP
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Chain verification should arguably be performed using the signing time rather
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than the current time. However, since the signing time is supplied by the
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signer it cannot be trusted without additional evidence (such as a trusted
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timestamp).
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.SH "RETURN VALUES"
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.IX Header "RETURN VALUES"
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\&\fIPKCS7_verify()\fR returns 1 for a successful verification and 0 if an error occurs.
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.PP
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\&\fIPKCS7_get0_signers()\fR returns all signers or \s-1NULL\s0 if an error occurred.
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.PP
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The error can be obtained from \fIERR_get_error\fR\|(3).
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.SH "BUGS"
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.IX Header "BUGS"
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The trusted certificate store is not searched for the signer's certificates.
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This is primarily due to the inadequacies of the current \fBX509_STORE\fR
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functionality.
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.PP
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The lack of single pass processing means that the signed content must all
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be held in memory if it is not detached.
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.SH "SEE ALSO"
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.IX Header "SEE ALSO"
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\&\fICMS_verify\fR\|(3), \fIPKCS7_add_certificate\fR\|(3), \fIPKCS7_add_crl\fR\|(3),
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\&\fIERR_get_error\fR\|(3), \fIPKCS7_sign\fR\|(3)
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.SH "COPYRIGHT"
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.IX Header "COPYRIGHT"
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Copyright 2002\-2020 The OpenSSL Project Authors. All Rights Reserved.
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.PP
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Licensed under the Apache License 2.0 (the \*(L"License\*(R"). You may not use
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this file except in compliance with the License. You can obtain a copy
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in the file \s-1LICENSE\s0 in the source distribution or at
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<https://www.openssl.org/source/license.html>.
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