213 lines
6.9 KiB
Groff
213 lines
6.9 KiB
Groff
.\" $NetBSD: SSL_CTX_set_cert_verify_callback.3,v 1.2 2002/07/31 01:45:27 itojun Exp $
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.\" Wed Jul 31 10:37:59 2002
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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 "0.9.6e" "2002-06-10" "OpenSSL"
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.UC
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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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.Vb 3
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\& void SSL_CTX_set_cert_verify_callback(SSL_CTX *ctx, int (*callback)(),
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\& char *arg);
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\& int (*callback)();
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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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\&\fBctx\fR. \s-1SSL\s0 objects, that are created from \fBctx\fR inherit the setting valid at
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the time, SSL_new(3) is called. \fBarg\fR is currently ignored.
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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 \fBcallback\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 \fBcallback\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, \fBcallback\fR will be called with
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the argument callback(X509_STORE_CTX *x509_store_ctx). The arguments \fBarg\fR
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that can be specified when setting \fBcallback\fR are currently ignored.
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.PP
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\&\fBcallback\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 \fBcallback\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 \fBx509_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 \fBx509_store_ctx\fR, \fBcallback\fR has access to the \fBverify_callback\fR
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function set using SSL_CTX_set_verify(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 SSL_CTX_set_verify(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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It is possible to specify arguments to be passed to the verification callback.
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Currently they are however not passed but ignored.
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.PP
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The \fBcallback\fR function is not specified via a prototype, so that no
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type checking takes place.
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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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ssl(3), SSL_CTX_set_verify(3),
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SSL_get_verify_result(3),
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SSL_CTX_load_verify_locations(3)
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