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90134d9806
Split off the portions that mutate the SSL object into a separate function that the state machine calls, so that the public API can be a pure function. (It still needs the SSL parameter in order to determine what SSL_METHOD's get_cipher_by_char() routine to use, though.) Instead of returning the stack of ciphers (functionality that was not used internally), require using the output parameter, and add a separate output parameter for the SCSVs contained in the supplied octets, if desired. This lets us move to the standard return value convention. Also make both output stacks optional parameters. Reviewed-by: Matt Caswell <matt@openssl.org> Reviewed-by: Richard Levitte <levitte@openssl.org> (Merged from https://github.com/openssl/openssl/pull/2279)
100 lines
3.8 KiB
Plaintext
100 lines
3.8 KiB
Plaintext
=pod
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=head1 NAME
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SSL_get1_supported_ciphers, SSL_get_client_ciphers,
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SSL_get_ciphers, SSL_CTX_get_ciphers,
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SSL_bytes_to_cipher_list, SSL_get_cipher_list
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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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=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>, 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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This is the list that will be sent by the client to the server.
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The list supported by the server might include more ciphers in case there is a
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hole in the list of supported protocols.
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The server will also not use ciphers from this list depending on the
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configured certificates and DH parameters.
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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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=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 2000-2016 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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