Add manpages for SSL_get_certificate, SSL_get_private_key

This is as I understand these functions from reading the code.

Reviewed-by: Matt Caswell <matt@openssl.org>
Reviewed-by: Paul Dale <pauli@openssl.org>
Reviewed-by: Tomas Mraz <tomas@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/17815)

3 files changed, 79 insertions, 2 deletions

diff --git a/doc/build.info b/doc/build.info
index 4e1db237d7..46dabeb9a6 100644
--- a/doc/build.info
+++ b/doc/build.info
@@ -2415,6 +2415,10 @@ DEPEND[html/man3/SSL_get_all_async_fds.html]=man3/SSL_get_all_async_fds.pod
 GENERATE[html/man3/SSL_get_all_async_fds.html]=man3/SSL_get_all_async_fds.pod
 DEPEND[man/man3/SSL_get_all_async_fds.3]=man3/SSL_get_all_async_fds.pod
 GENERATE[man/man3/SSL_get_all_async_fds.3]=man3/SSL_get_all_async_fds.pod
+DEPEND[html/man3/SSL_get_certificate.html]=man3/SSL_get_certificate.pod
+GENERATE[html/man3/SSL_get_certificate.html]=man3/SSL_get_certificate.pod
+DEPEND[man/man3/SSL_get_certificate.3]=man3/SSL_get_certificate.pod
+GENERATE[man/man3/SSL_get_certificate.3]=man3/SSL_get_certificate.pod
 DEPEND[html/man3/SSL_get_ciphers.html]=man3/SSL_get_ciphers.pod
 GENERATE[html/man3/SSL_get_ciphers.html]=man3/SSL_get_ciphers.pod
 DEPEND[man/man3/SSL_get_ciphers.3]=man3/SSL_get_ciphers.pod
@@ -3327,6 +3331,7 @@ html/man3/SSL_free.html \
 html/man3/SSL_get0_peer_scts.html \
 html/man3/SSL_get_SSL_CTX.html \
 html/man3/SSL_get_all_async_fds.html \
+html/man3/SSL_get_certificate.html \
 html/man3/SSL_get_ciphers.html \
 html/man3/SSL_get_client_random.html \
 html/man3/SSL_get_current_cipher.html \
@@ -3920,6 +3925,7 @@ man/man3/SSL_free.3 \
 man/man3/SSL_get0_peer_scts.3 \
 man/man3/SSL_get_SSL_CTX.3 \
 man/man3/SSL_get_all_async_fds.3 \
+man/man3/SSL_get_certificate.3 \
 man/man3/SSL_get_ciphers.3 \
 man/man3/SSL_get_client_random.3 \
 man/man3/SSL_get_current_cipher.3 \
diff --git a/doc/man3/SSL_get_certificate.pod b/doc/man3/SSL_get_certificate.pod
new file mode 100644
index 0000000000..a57917c813
--- /dev/null
+++ b/doc/man3/SSL_get_certificate.pod
@@ -0,0 +1,73 @@
+=pod
+
+=head1 NAME
+
+SSL_get_certificate, SSL_get_privatekey - retrieve TLS/SSL certificate and
+private key
+
+=head1 SYNOPSIS
+
+ #include <openssl/ssl.h>
+
+ X509 *SSL_get_certificate(const SSL *s);
+ EVP_PKEY *SSL_get_privatekey(const SSL *s);
+
+=head1 DESCRIPTION
+
+SSL_get_certificate() returns a pointer to an B<X509> object representing a
+certificate used as the local peer's identity.
+
+Multiple certificates can be configured; for example, a server might have both
+RSA and ECDSA certificates. The certificate which is returned by
+SSL_get_certificate() is determined as follows:
+
+=over 4
+
+=item
+
+If it is called before certificate selection has occurred, it returns the most
+recently added certificate, or NULL if no certificate has been added.
+
+=item
+
+After certificate selection has occurred, it returns the certificate which was
+selected during the handshake, or NULL if no certificate was selected (for
+example, on a client where no client certificate is in use).
+
+=back
+
+Certificate selection occurs during the handshake; therefore, the value returned
+by SSL_get_certificate() during any callback made during the handshake process
+will depend on whether that callback is made before or after certificate
+selection occurs.
+
+A specific use for SSL_get_certificate() is inside a callback set via a call to
+L<SSL_CTX_set_tlsext_status_cb(3)>. This callback occurs after certificate
+selection, where it can be used to examine a server's chosen certificate, for
+example for the purpose of identifying a certificate's OCSP responder URL so
+that an OCSP response can be obtained.
+
+SSL_get_privatekey() returns a pointer to the B<EVP_PKEY> object corresponding
+to the certificate returned by SSL_get_certificate(), if any.
+
+=head1 RETURN VALUES
+
+These functions return pointers to their respective objects, or NULL if no such
+object is available. Returned objects are owned by the SSL object and should not
+be freed by users of these functions.
+
+=head1 SEE ALSO
+
+L<ssl(7)>, L<SSL_CTX_set_tlsext_status_cb(3)>
+
+=head1 COPYRIGHT
+
+Copyright 2001-2022 The OpenSSL Project Authors. All Rights Reserved.
+
+Licensed under the Apache License 2.0 (the "License").  You may not use
+this file except in compliance with the License.  You can obtain a copy
+in the file LICENSE in the source distribution or at
+L<https://www.openssl.org/source/license.html>.
+
+=cut
+
diff --git a/util/missingssl.txt b/util/missingssl.txt
index ef13fca84a..6adf6c5117 100644
--- a/util/missingssl.txt
+++ b/util/missingssl.txt
@@ -22,12 +22,10 @@ SSL_certs_clear(3)
 SSL_copy_session_id(3)
 SSL_dup_CA_list(3)
 SSL_get0_dane(3)
-SSL_get_certificate(3)
 SSL_get_current_compression(3)
 SSL_get_current_expansion(3)
 SSL_get_finished(3)
 SSL_get_peer_finished(3)
-SSL_get_privatekey(3)
 SSL_set_SSL_CTX(3)
 SSL_set_debug(3)
 SSL_set_not_resumable_session_callback(3)