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VersionsSSL_CTX_SET_TLSEXT_USE_SRTP(3ossl) OpenSSL SSL_CTX_SET_TLSEXT_USE_SRTP(3ossl)
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
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);
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 profiles parameters should point to a
NUL-terminated, colon delimited list of SRTP protection profile names.
The currently supported protection profile names are:
SRTP_AES128_CM_SHA1_80
This corresponds to SRTP_AES128_CM_HMAC_SHA1_80 defined in RFC5764.
SRTP_AES128_CM_SHA1_32
This corresponds to SRTP_AES128_CM_HMAC_SHA1_32 defined in RFC5764.
SRTP_AEAD_AES_128_GCM
This corresponds to the profile of the same name defined in RFC7714.
SRTP_AEAD_AES_256_GCM
This corresponds to the profile of the same name defined in RFC7714.
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 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.
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.
SEE ALSO
ssl(7), SSL_export_keying_material(3)
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
<https://www.openssl.org/source/license.html>.
3.1.3 2023-09-19 SSL_CTX_SET_TLSEXT_USE_SRTP(3ossl)
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
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);
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 profiles parameters should point to a
NUL-terminated, colon delimited list of SRTP protection profile names.
The currently supported protection profile names are:
SRTP_AES128_CM_SHA1_80
This corresponds to SRTP_AES128_CM_HMAC_SHA1_80 defined in RFC5764.
SRTP_AES128_CM_SHA1_32
This corresponds to SRTP_AES128_CM_HMAC_SHA1_32 defined in RFC5764.
SRTP_AEAD_AES_128_GCM
This corresponds to the profile of the same name defined in RFC7714.
SRTP_AEAD_AES_256_GCM
This corresponds to the profile of the same name defined in RFC7714.
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 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.
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.
SEE ALSO
ssl(7), SSL_export_keying_material(3)
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
<https://www.openssl.org/source/license.html>.
3.1.3 2023-09-19 SSL_CTX_SET_TLSEXT_USE_SRTP(3ossl)