forked from cory/tildefriends
Cory McWilliams
09ddfffa6b
git-svn-id: https://www.unprompted.com/svn/projects/tildefriends/trunk@4088 ed5197a5-7fde-0310-b194-c3ffbd925b24
242 lines
9.3 KiB
Groff
242 lines
9.3 KiB
Groff
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.rm #[ #] #H #V #F C
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.\" ========================================================================
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.\"
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.IX Title "SSL_GET_CIPHERS 3"
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.TH SSL_GET_CIPHERS 3 "2020-04-21" "1.1.1g" "OpenSSL"
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.\" For nroff, turn off justification. Always turn off hyphenation; it makes
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.\" way too many mistakes in technical documents.
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.if n .ad l
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.nh
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.SH "NAME"
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SSL_get1_supported_ciphers, SSL_get_client_ciphers, SSL_get_ciphers, SSL_CTX_get_ciphers, SSL_bytes_to_cipher_list, SSL_get_cipher_list, SSL_get_shared_ciphers \&\- get list of available SSL_CIPHERs
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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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\&
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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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.Ve
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.SH "DESCRIPTION"
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.IX Header "DESCRIPTION"
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\&\fBSSL_get_ciphers()\fR returns the stack of available SSL_CIPHERs for \fBssl\fR,
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sorted by preference. If \fBssl\fR is \s-1NULL\s0 or no ciphers are available, \s-1NULL\s0
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is returned.
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.PP
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\&\fBSSL_CTX_get_ciphers()\fR returns the stack of available SSL_CIPHERs for \fBctx\fR.
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.PP
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\&\fBSSL_get1_supported_ciphers()\fR returns the stack of enabled SSL_CIPHERs for
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\&\fBssl\fR 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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\&\s-1SRP\s0 and \s-1PSK\s0 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 \fBssl\fR is \s-1NULL\s0 or no ciphers are available, \s-1NULL\s0 is returned.
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.PP
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\&\fBSSL_get_client_ciphers()\fR returns the stack of available SSL_CIPHERs matching the
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list received from the client on \fBssl\fR. If \fBssl\fR is \s-1NULL,\s0 no ciphers are
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available, or \fBssl\fR is not operating in server mode, \s-1NULL\s0 is returned.
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.PP
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\&\fBSSL_bytes_to_cipher_list()\fR treats the supplied \fBlen\fR octets in \fBbytes\fR
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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 \fBisv2format\fR 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 \s-1SSL_CIPHER\s0 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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.PP
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\&\fBSSL_get_cipher_list()\fR returns a pointer to the name of the \s-1SSL_CIPHER\s0
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listed for \fBssl\fR with \fBpriority\fR. If \fBssl\fR is \s-1NULL,\s0 no ciphers are
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available, or there are less ciphers than \fBpriority\fR available, \s-1NULL\s0
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is returned.
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.PP
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\&\fBSSL_get_shared_ciphers()\fR creates a colon separated and \s-1NUL\s0 terminated list of
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\&\s-1SSL_CIPHER\s0 names that are available in both the client and the server. \fBbuf\fR is
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the buffer that should be populated with the list of names and \fBsize\fR is the
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size of that buffer. A pointer to \fBbuf\fR is returned on success or \s-1NULL\s0 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 \fBSSL_get1_supported_ciphers()\fR 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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.SH "NOTES"
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.IX Header "NOTES"
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The details of the ciphers obtained by \fBSSL_get_ciphers()\fR, \fBSSL_CTX_get_ciphers()\fR
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\&\fBSSL_get1_supported_ciphers()\fR and \fBSSL_get_client_ciphers()\fR can be obtained using
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the \fBSSL_CIPHER_get_name\fR\|(3) family of functions.
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.PP
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Call \fBSSL_get_cipher_list()\fR with \fBpriority\fR starting from 0 to obtain the
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sorted list of available ciphers, until \s-1NULL\s0 is returned.
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.PP
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Note: \fBSSL_get_ciphers()\fR, \fBSSL_CTX_get_ciphers()\fR and \fBSSL_get_client_ciphers()\fR
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return a pointer to an internal cipher stack, which will be freed later on when
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the \s-1SSL\s0 or \s-1SSL_SESSION\s0 object is freed. Therefore, the calling code \fB\s-1MUST NOT\s0\fR
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free the return value itself.
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.PP
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The stack returned by \fBSSL_get1_supported_ciphers()\fR should be freed using
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\&\fBsk_SSL_CIPHER_free()\fR.
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.PP
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The stacks returned by \fBSSL_bytes_to_cipher_list()\fR should be freed using
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\&\fBsk_SSL_CIPHER_free()\fR.
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.SH "RETURN VALUES"
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.IX Header "RETURN VALUES"
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See \s-1DESCRIPTION\s0
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.SH "SEE ALSO"
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.IX Header "SEE ALSO"
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\&\fBssl\fR\|(7), \fBSSL_CTX_set_cipher_list\fR\|(3),
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\&\fBSSL_CIPHER_get_name\fR\|(3)
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.SH "COPYRIGHT"
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.IX Header "COPYRIGHT"
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Copyright 2000\-2018 The OpenSSL Project Authors. All Rights Reserved.
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.PP
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Licensed under the OpenSSL license (the \*(L"License\*(R"). 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 \s-1LICENSE\s0 in the source distribution or at
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<https://www.openssl.org/source/license.html>.
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