204 lines
6.9 KiB
Groff
204 lines
6.9 KiB
Groff
.\" $NetBSD: SSL_CTX_set_cert_verify_callback.3,v 1.13 2007/11/27 22:19:32 christos Exp $
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.\" ========================================================================
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.\"
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.IX Title "SSL_CTX_set_cert_verify_callback 3"
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.TH SSL_CTX_set_cert_verify_callback 3 "2003-07-24" "0.9.8e" "OpenSSL"
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.SH "NAME"
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SSL_CTX_set_cert_verify_callback \- set peer certificate verification procedure
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.SH "LIBRARY"
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libcrypto, -lcrypto
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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/ssl.h>
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.Ve
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.PP
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.Vb 1
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\& void SSL_CTX_set_cert_verify_callback(SSL_CTX *ctx, int (*callback)(X509_STORE_CTX *,void *), void *arg);
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.Ve
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.SH "DESCRIPTION"
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.IX Header "DESCRIPTION"
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\&\fISSL_CTX_set_cert_verify_callback()\fR sets the verification callback function for
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\&\fIctx\fR. \s-1SSL\s0 objects that are created from \fIctx\fR inherit the setting valid at
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the time when \fISSL_new\fR\|(3) is called.
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.SH "NOTES"
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.IX Header "NOTES"
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Whenever a certificate is verified during a \s-1SSL/TLS\s0 handshake, a verification
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function is called. If the application does not explicitly specify a
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verification callback function, the built-in verification function is used.
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If a verification callback \fIcallback\fR is specified via
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\&\fISSL_CTX_set_cert_verify_callback()\fR, the supplied callback function is called
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instead. By setting \fIcallback\fR to \s-1NULL\s0, the default behaviour is restored.
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.PP
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When the verification must be performed, \fIcallback\fR will be called with
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the arguments callback(X509_STORE_CTX *x509_store_ctx, void *arg). The
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argument \fIarg\fR is specified by the application when setting \fIcallback\fR.
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.PP
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\&\fIcallback\fR should return 1 to indicate verification success and 0 to
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indicate verification failure. If \s-1SSL_VERIFY_PEER\s0 is set and \fIcallback\fR
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returns 0, the handshake will fail. As the verification procedure may
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allow to continue the connection in case of failure (by always returning 1)
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the verification result must be set in any case using the \fBerror\fR
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member of \fIx509_store_ctx\fR so that the calling application will be informed
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about the detailed result of the verification procedure!
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.PP
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Within \fIx509_store_ctx\fR, \fIcallback\fR has access to the \fIverify_callback\fR
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function set using \fISSL_CTX_set_verify\fR\|(3).
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.SH "WARNINGS"
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.IX Header "WARNINGS"
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Do not mix the verification callback described in this function with the
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\&\fBverify_callback\fR function called during the verification process. The
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latter is set using the \fISSL_CTX_set_verify\fR\|(3)
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family of functions.
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.PP
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Providing a complete verification procedure including certificate purpose
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settings etc is a complex task. The built-in procedure is quite powerful
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and in most cases it should be sufficient to modify its behaviour using
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the \fBverify_callback\fR function.
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.SH "BUGS"
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.IX Header "BUGS"
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.SH "RETURN VALUES"
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.IX Header "RETURN VALUES"
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\&\fISSL_CTX_set_cert_verify_callback()\fR does not provide diagnostic information.
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.SH "SEE ALSO"
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.IX Header "SEE ALSO"
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\&\fIssl\fR\|(3), \fISSL_CTX_set_verify\fR\|(3),
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\&\fISSL_get_verify_result\fR\|(3),
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\&\fISSL_CTX_load_verify_locations\fR\|(3)
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.SH "HISTORY"
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.IX Header "HISTORY"
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Previous to OpenSSL 0.9.7, the \fIarg\fR argument to \fBSSL_CTX_set_cert_verify_callback\fR
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was ignored, and \fIcallback\fR was called simply as
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int (*callback)(X509_STORE_CTX *)
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To compile software written for previous versions of OpenSSL, a dummy
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argument will have to be added to \fIcallback\fR.
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