118 lines
4.9 KiB
Plaintext
118 lines
4.9 KiB
Plaintext
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=pod
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=head1 NAME
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SSL_get1_supported_ciphers,
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SSL_get_client_ciphers,
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SSL_get_ciphers,
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SSL_CTX_get_ciphers,
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SSL_bytes_to_cipher_list,
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SSL_get_cipher_list,
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SSL_get_shared_ciphers
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- get list of available SSL_CIPHERs
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=head1 SYNOPSIS
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#include <openssl/ssl.h>
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STACK_OF(SSL_CIPHER) *SSL_get_ciphers(const SSL *ssl);
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STACK_OF(SSL_CIPHER) *SSL_CTX_get_ciphers(const SSL_CTX *ctx);
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STACK_OF(SSL_CIPHER) *SSL_get1_supported_ciphers(SSL *s);
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STACK_OF(SSL_CIPHER) *SSL_get_client_ciphers(const SSL *ssl);
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int SSL_bytes_to_cipher_list(SSL *s, const unsigned char *bytes, size_t len,
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int isv2format, STACK_OF(SSL_CIPHER) **sk,
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STACK_OF(SSL_CIPHER) **scsvs);
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const char *SSL_get_cipher_list(const SSL *ssl, int priority);
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char *SSL_get_shared_ciphers(const SSL *s, char *buf, int size);
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=head1 DESCRIPTION
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SSL_get_ciphers() returns the stack of available SSL_CIPHERs for B<ssl>,
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sorted by preference. If B<ssl> is NULL or no ciphers are available, NULL
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is returned.
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SSL_CTX_get_ciphers() returns the stack of available SSL_CIPHERs for B<ctx>.
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SSL_get1_supported_ciphers() returns the stack of enabled SSL_CIPHERs for
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B<ssl> as would be sent in a ClientHello (that is, sorted by preference).
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The list depends on settings like the cipher list, the supported protocol
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versions, the security level, and the enabled signature algorithms.
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SRP and PSK ciphers are only enabled if the appropriate callbacks or settings
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have been applied.
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The list of ciphers that would be sent in a ClientHello can differ from
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the list of ciphers that would be acceptable when acting as a server.
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For example, additional ciphers may be usable by a server if there is
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a gap in the list of supported protocols, and some ciphers may not be
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usable by a server if there is not a suitable certificate configured.
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If B<ssl> is NULL or no ciphers are available, NULL is returned.
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SSL_get_client_ciphers() returns the stack of available SSL_CIPHERs matching the
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list received from the client on B<ssl>. If B<ssl> is NULL, no ciphers are
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available, or B<ssl> is not operating in server mode, NULL is returned.
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SSL_bytes_to_cipher_list() treats the supplied B<len> octets in B<bytes>
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as a wire-protocol cipher suite specification (in the three-octet-per-cipher
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SSLv2 wire format if B<isv2format> is nonzero; otherwise the two-octet
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SSLv3/TLS wire format), and parses the cipher suites supported by the library
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into the returned stacks of SSL_CIPHER objects sk and Signalling Cipher-Suite
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Values scsvs. Unsupported cipher suites are ignored. Returns 1 on success
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and 0 on failure.
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SSL_get_cipher_list() returns a pointer to the name of the SSL_CIPHER
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listed for B<ssl> with B<priority>. If B<ssl> is NULL, no ciphers are
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available, or there are less ciphers than B<priority> available, NULL
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is returned.
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SSL_get_shared_ciphers() creates a colon separated and NUL terminated list of
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SSL_CIPHER names that are available in both the client and the server. B<buf> is
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the buffer that should be populated with the list of names and B<size> is the
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size of that buffer. A pointer to B<buf> is returned on success or NULL on
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error. If the supplied buffer is not large enough to contain the complete list
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of names then a truncated list of names will be returned. Note that just because
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a ciphersuite is available (i.e. it is configured in the cipher list) and shared
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by both the client and the server it does not mean that it is enabled (see the
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description of SSL_get1_supported_ciphers() above). This function will return
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available shared ciphersuites whether or not they are enabled. This is a server
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side function only and must only be called after the completion of the initial
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handshake.
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=head1 NOTES
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The details of the ciphers obtained by SSL_get_ciphers(), SSL_CTX_get_ciphers()
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SSL_get1_supported_ciphers() and SSL_get_client_ciphers() can be obtained using
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the L<SSL_CIPHER_get_name(3)> family of functions.
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Call SSL_get_cipher_list() with B<priority> starting from 0 to obtain the
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sorted list of available ciphers, until NULL is returned.
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Note: SSL_get_ciphers(), SSL_CTX_get_ciphers() and SSL_get_client_ciphers()
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return a pointer to an internal cipher stack, which will be freed later on when
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the SSL or SSL_SESSION object is freed. Therefore, the calling code B<MUST NOT>
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free the return value itself.
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The stack returned by SSL_get1_supported_ciphers() should be freed using
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sk_SSL_CIPHER_free().
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The stacks returned by SSL_bytes_to_cipher_list() should be freed using
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sk_SSL_CIPHER_free().
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=head1 RETURN VALUES
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See DESCRIPTION
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=head1 SEE ALSO
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L<ssl(7)>, L<SSL_CTX_set_cipher_list(3)>,
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L<SSL_CIPHER_get_name(3)>
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=head1 COPYRIGHT
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Copyright 2000-2018 The OpenSSL Project Authors. All Rights Reserved.
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Licensed under the OpenSSL license (the "License"). 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 LICENSE in the source distribution or at
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L<https://www.openssl.org/source/license.html>.
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=cut
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