mirror of
https://github.com/openssl/openssl.git
synced 2024-12-03 05:41:46 +08:00
98ca37e4aa
Reviewed-by: Matt Caswell <matt@openssl.org> Reviewed-by: Tomas Mraz <tmraz@fedoraproject.org> (Merged from https://github.com/openssl/openssl/pull/10208)
113 lines
4.2 KiB
Plaintext
113 lines
4.2 KiB
Plaintext
=pod
|
|
|
|
=head1 NAME
|
|
|
|
SSL_CTX_set_tlsext_use_srtp,
|
|
SSL_set_tlsext_use_srtp,
|
|
SSL_get_srtp_profiles,
|
|
SSL_get_selected_srtp_profile
|
|
- Configure and query SRTP support
|
|
|
|
=head1 SYNOPSIS
|
|
|
|
#include <openssl/srtp.h>
|
|
|
|
int SSL_CTX_set_tlsext_use_srtp(SSL_CTX *ctx, const char *profiles);
|
|
int SSL_set_tlsext_use_srtp(SSL *ssl, const char *profiles);
|
|
|
|
STACK_OF(SRTP_PROTECTION_PROFILE) *SSL_get_srtp_profiles(SSL *ssl);
|
|
SRTP_PROTECTION_PROFILE *SSL_get_selected_srtp_profile(SSL *s);
|
|
|
|
=head1 DESCRIPTION
|
|
|
|
SRTP is the Secure Real-Time Transport Protocol. OpenSSL implements support for
|
|
the "use_srtp" DTLS extension defined in RFC5764. This provides a mechanism for
|
|
establishing SRTP keying material, algorithms and parameters using DTLS. This
|
|
capability may be used as part of an implementation that conforms to RFC5763.
|
|
OpenSSL does not implement SRTP itself or RFC5763. Note that OpenSSL does not
|
|
support the use of SRTP Master Key Identifiers (MKIs). Also note that this
|
|
extension is only supported in DTLS. Any SRTP configuration will be ignored if a
|
|
TLS connection is attempted.
|
|
|
|
An OpenSSL client wishing to send the "use_srtp" extension should call
|
|
SSL_CTX_set_tlsext_use_srtp() to set its use for all SSL objects subsequently
|
|
created from an SSL_CTX. Alternatively a client may call
|
|
SSL_set_tlsext_use_srtp() to set its use for an individual SSL object. The
|
|
B<profiles> parameters should point to a NUL-terminated, colon delimited list of
|
|
SRTP protection profile names.
|
|
|
|
The currently supported protection profile names are:
|
|
|
|
=over 4
|
|
|
|
=item SRTP_AES128_CM_SHA1_80
|
|
|
|
This corresponds to SRTP_AES128_CM_HMAC_SHA1_80 defined in RFC5764.
|
|
|
|
=item SRTP_AES128_CM_SHA1_32
|
|
|
|
This corresponds to SRTP_AES128_CM_HMAC_SHA1_32 defined in RFC5764.
|
|
|
|
=item SRTP_AEAD_AES_128_GCM
|
|
|
|
This corresponds to the profile of the same name defined in RFC7714.
|
|
|
|
=item SRTP_AEAD_AES_256_GCM
|
|
|
|
This corresponds to the profile of the same name defined in RFC7714.
|
|
|
|
=back
|
|
|
|
Supplying an unrecognised protection profile name will result in an error.
|
|
|
|
An OpenSSL server wishing to support the "use_srtp" extension should also call
|
|
SSL_CTX_set_tlsext_use_srtp() or SSL_set_tlsext_use_srtp() to indicate the
|
|
protection profiles that it is willing to negotiate.
|
|
|
|
The currently configured list of protection profiles for either a client or a
|
|
server can be obtained by calling SSL_get_srtp_profiles(). This returns a stack
|
|
of SRTP_PROTECTION_PROFILE objects. The memory pointed to in the return value of
|
|
this function should not be freed by the caller.
|
|
|
|
After a handshake has been completed the negotiated SRTP protection profile (if
|
|
any) can be obtained (on the client or the server) by calling
|
|
SSL_get_selected_srtp_profile(). This function will return NULL if no SRTP
|
|
protection profile was negotiated. The memory returned from this function should
|
|
not be freed by the caller.
|
|
|
|
If an SRTP protection profile has been successfully negotiated then the SRTP
|
|
keying material (on both the client and server) should be obtained via a call to
|
|
L<SSL_export_keying_material(3)>. This call should provide a label value of
|
|
"EXTRACTOR-dtls_srtp" and a NULL context value (use_context is 0). The total
|
|
length of keying material obtained should be equal to two times the sum of the
|
|
master key length and the salt length as defined for the protection profile in
|
|
use. This provides the client write master key, the server write master key, the
|
|
client write master salt and the server write master salt in that order.
|
|
|
|
=head1 RETURN VALUES
|
|
|
|
SSL_CTX_set_tlsext_use_srtp() and SSL_set_tlsext_use_srtp() return 0 on success
|
|
or 1 on error.
|
|
|
|
SSL_get_srtp_profiles() returns a stack of SRTP_PROTECTION_PROFILE objects on
|
|
success or NULL on error or if no protection profiles have been configured.
|
|
|
|
SSL_get_selected_srtp_profile() returns a pointer to an SRTP_PROTECTION_PROFILE
|
|
object if one has been negotiated or NULL otherwise.
|
|
|
|
=head1 SEE ALSO
|
|
|
|
L<ssl(7)>,
|
|
L<SSL_export_keying_material(3)>
|
|
|
|
=head1 COPYRIGHT
|
|
|
|
Copyright 2017-2018 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
|