Update for OpenSSL 0.9.7. No assembler code at the moment. This

will follow.

1 files changed, 229 insertions, 0 deletions

diff --git a/secure/lib/libssl/man/SSL_CTX_set_client_cert_cb.3 b/secure/lib/libssl/man/SSL_CTX_set_client_cert_cb.3
new file mode 100644
index 0000000..73a04c1
--- /dev/null
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@@ -0,0 +1,229 @@
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+.\" ======================================================================
+.\"
+.IX Title "SSL_CTX_set_client_cert_cb 3"
+.TH SSL_CTX_set_client_cert_cb 3 "0.9.7" "2003-01-13" "OpenSSL"
+.UC
+.SH "NAME"
+SSL_CTX_set_client_cert_cb, SSL_CTX_get_client_cert_cb \- handle client certificate callback function
+.SH "SYNOPSIS"
+.IX Header "SYNOPSIS"
+.Vb 1
+\& #include <openssl/ssl.h>
+.Ve
+.Vb 3
+\& void SSL_CTX_set_client_cert_cb(SSL_CTX *ctx, int (*client_cert_cb)(SSL *ssl, X509 **x509, EVP_PKEY **pkey));
+\& int (*SSL_CTX_get_client_cert_cb(SSL_CTX *ctx))(SSL *ssl, X509 **x509, EVP_PKEY **pkey);
+\& int (*client_cert_cb)(SSL *ssl, X509 **x509, EVP_PKEY **pkey);
+.Ve
+.SH "DESCRIPTION"
+.IX Header "DESCRIPTION"
+\&\fISSL_CTX_set_client_cert_cb()\fR sets the \fB\f(BIclient_cert_cb()\fB\fR callback, that is
+called when a client certificate is requested by a server and no certificate
+was yet set for the \s-1SSL\s0 object.
+.PP
+When \fB\f(BIclient_cert_cb()\fB\fR is \s-1NULL\s0, no callback function is used.
+.PP
+\&\fISSL_CTX_get_client_cert_cb()\fR returns a pointer to the currently set callback
+function.
+.PP
+\&\fIclient_cert_cb()\fR is the application defined callback. If it wants to
+set a certificate, a certificate/private key combination must be set
+using the \fBx509\fR and \fBpkey\fR arguments and \*(L"1\*(R" must be returned. The
+certificate will be installed into \fBssl\fR, see the \s-1NOTES\s0 and \s-1BUGS\s0 sections.
+If no certificate should be set, \*(L"0\*(R" has to be returned and no certificate
+will be sent. A negative return value will suspend the handshake and the
+handshake function will return immediatly. SSL_get_error(3)
+will return \s-1SSL_ERROR_WANT_X509_LOOKUP\s0 to indicate, that the handshake was
+suspended. The next call to the handshake function will again lead to the call
+of \fIclient_cert_cb()\fR. It is the job of the \fIclient_cert_cb()\fR to store information
+about the state of the last call, if required to continue.
+.SH "NOTES"
+.IX Header "NOTES"
+During a handshake (or renegotiation) a server may request a certificate
+from the client. A client certificate must only be sent, when the server
+did send the request.
+.PP
+When a certificate was set using the
+SSL_CTX_use_certificate(3) family of functions,
+it will be sent to the server. The \s-1TLS\s0 standard requires that only a
+certificate is sent, if it matches the list of acceptable CAs sent by the
+server. This constraint is violated by the default behavior of the OpenSSL
+library. Using the callback function it is possible to implement a proper
+selection routine or to allow a user interaction to choose the certificate to
+be sent.
+.PP
+If a callback function is defined and no certificate was yet defined for the
+\&\s-1SSL\s0 object, the callback function will be called.
+If the callback function returns a certificate, the OpenSSL library
+will try to load the private key and certificate data into the \s-1SSL\s0
+object using the \fISSL_use_certificate()\fR and \fISSL_use_private_key()\fR functions.
+Thus it will permanently install the certificate and key for this \s-1SSL\s0
+object. It will not be reset by calling SSL_clear(3).
+If the callback returns no certificate, the OpenSSL library will not send
+a certificate.
+.SH "BUGS"
+.IX Header "BUGS"
+The \fIclient_cert_cb()\fR cannot return a complete certificate chain, it can
+only return one client certificate. If the chain only has a length of 2,
+the root \s-1CA\s0 certificate may be omitted according to the \s-1TLS\s0 standard and
+thus a standard conforming answer can be sent to the server. For a
+longer chain, the client must send the complete chain (with the option
+to leave out the root \s-1CA\s0 certificate). This can only be accomplished by
+either adding the intermediate \s-1CA\s0 certificates into the trusted
+certificate store for the \s-1SSL_CTX\s0 object (resulting in having to add
+\&\s-1CA\s0 certificates that otherwise maybe would not be trusted), or by adding
+the chain certificates using the
+SSL_CTX_add_extra_chain_cert(3)
+function, which is only available for the \s-1SSL_CTX\s0 object as a whole and that
+therefore probably can only apply for one client certificate, making
+the concept of the callback function (to allow the choice from several
+certificates) questionable.
+.PP
+Once the \s-1SSL\s0 object has been used in conjunction with the callback function,
+the certificate will be set for the \s-1SSL\s0 object and will not be cleared
+even when SSL_clear(3) is being called. It is therefore
+mandatory to destroy the \s-1SSL\s0 object using SSL_free(3)
+and create a new one to return to the previous state.
+.SH "SEE ALSO"
+.IX Header "SEE ALSO"
+ssl(3), SSL_CTX_use_certificate(3),
+SSL_CTX_add_extra_chain_cert(3),
+SSL_get_client_CA_list(3),
+SSL_clear(3), SSL_free(3)