556 lines
25 KiB
Plaintext
556 lines
25 KiB
Plaintext
* libZRTP SDK library, implements the ZRTP secure VoIP protocol.
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* Copyright (c) 2006-2009 Philip R. Zimmermann. All rights reserved.
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* Contact: http://philzimmermann.com
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* For licensing and other legal details, see the file zrtp_legal.c.
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!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
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SINCE LIBZRTP v0.80 CHANGELOG IS A PART OF HTML DOCUMENTATION.
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Check generated html or doc/manuals/changelog.dox doxygen sources
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!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
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libzrtp 0.7.1 18.11.2008
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--------------------------------------------------------------------------------
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1. Fixed bug with hardcoded AES128 cipher for generating SRTP keys. In this
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version is selected according to ZRTP discovery.
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2. Added initialization/deinitalization functions to zrtp helper functions.
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libzrtp 0.7.0 04.11.2008
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--------------------------------------------------------------------------------
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1. Changes in libzrtp sources tree.
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2. Improvements in libzrtp initialization routine:
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- all global zrtp options were combined in zrtp_config_t structure;
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- zrtp_init() allocates memory for zrtp global context;
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- zrtp_config_defaults()
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3. Improvements for Passive/Active mode support.
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a) A passive endpoint never sends a commit message, period. Also, it
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declares itself as a passive endpoint by setting the P flag it its own
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Hello message;
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b) A active endpoint does not send a commit to a passive endpoint, which it
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recognizes by detecting the P flag;
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c) A passive phone, if acting as a SIP initiator (meaning it initiated the
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call), rejects all commit packets from everyone;
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d) A passive phone rejects all commit messages from a PBX, which is easily
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recognized by the M flag.
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Passive mode support is built into the library logic and will be used
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automatically if the developer specifies signaling role by setting
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is_initiator flag in zrtp_init_session_ctx().
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4. Improvements in ZRTP feedback interface and system-dependent functions.
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There are two types of interface functions in libzrtp: system dependent API
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and realization of helper functions and events. System dependent API in
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defined in zrtp_iface_system.h as set of extern functions. System
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functions are already implemented for several basic platforms in
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zrtp_iface.sys.c libzrtp feedback and helper functions were re-factored
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and implemented as set of callbacks. If the developer doesn't want to
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handle one or another event it may just leave necessary pointer empty.
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See zrtp_init() and zrtp_callback_t, zrtp_iface.h for more details.
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5. ZRTP configuration approach was improved: zrtp_config_xxx.h contains
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adjustments for necessary target platform. libzrtp contains default
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configs for Linux, OS X, Windows, Window CE and Symbian platforms.
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All ZRTP protocol and behavior related adjustments are collected in
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zrtp_config_user.h. Edit this file to configure libzrtp for your
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needs.
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6. Implemented new functions in protocol according to the Internet Draft v 10.
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7. Improved realization of built-in libzrtp scheduler. Fixed bug with crashing
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on performing delay call when zrtp session have been already deleted.
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8. Logging function was improved. Use ZRTP_LOG macro to print log messages. See
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zrtp_log.h for more information.
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libzrtp 0.6.8 03.09.2008
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--------------------------------------------------------------------------------
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ZRTP
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1. Fixed bug with incorrect maximum value for T1 retry interval timer which
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increased delay between LOOKING_FOR_ZRTP and NO_ZRTP_SUPPORT states.
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Internal fix, no API changes required;
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2. Implemented version negotiation according to the latest specification.
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libzrtp v 0.6.8 supports ZRTP v0.90 only. No changes required in
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applications that use the SDK.
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3. Compilation flag WITH_ZFONE was removed. The developer, who wants to use
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built-in ZRTP cache, has to set name of the ZRTP cache explicitly,
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implementing zrtp_get_cache_path() function.
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4. New libzrtp licensing scheme was implemented. It allows the licensing policy
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to be changed at run time. See zrtp_license_mode_t doc. for more details.
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Affected API - zrtp_init().
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5. ZRTP Protocol version was changed to 0.90 according to ZRTP Internet Draft.
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6. Some changes in Linux config files: surplus configuration flags were removed
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from ./cfg.XXX templates.
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7. Added experimental ZRTP messages retries scheduler for slow channels. As
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ex ample for GSM CSD channel with average bandwidth 6Kb/s. To use this
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option build library with BUILD_FOR_CSD flag.
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libzrtp 0.6.6 27.06.2008
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--------------------------------------------------------------------------------
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ZRTP
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1. Small bug was fixed in S0 calculation: when RS1 is corrupted the library uses
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RS2 instead;
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2. Some changes in Makefile and building process: unused header were eliminated
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from the installation process.
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3. -DBUILD_WITH_ZRTP_MUTEXES was replaced with --enable_mutexes option passed to
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./configure script. This change allows not to specify any libzrtp compilation
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flags during user application compilation. --enable-mutexes adds
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BUILD_ZRTP_MUTEXES definition to the ./config/zrtp_unix_config.h so if you
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build libzrtp on other platforms - define this flag manually (windows
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configuration file already includes this option).
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4. Clean-up in .h and .c comments was made.
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libzrtp 0.6.5 04.06.2008
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--------------------------------------------------------------------------------
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ZRTP
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1. New names for: other_secret - pbxs; srtps - auxs. In bits and secrets storages;
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2. RS2 secret was eliminated form DH s0 calculation;
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3. Protocol version number was increased to 0.85
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libzrtp 0.6.4 19.05.2008
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--------------------------------------------------------------------------------
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ZRTP
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1. According to the new version of the Internet Draft Signaling shared secret was
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removed from the protocol and from the sources. It was not used by interface
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functions and developers may change nothing in libzrtp based applications.
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2. DH4K Key echange was eleminated from the specification and from the sources.
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Now ECDH is used for all larger AES key sizes.
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libzrtp 0.6.2 04.02.2008
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--------------------------------------------------------------------------------
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ZRTP
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1. New behaviour for Secure --> Clear --> Secure scenario was implemnted. According
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to ZRTP ID 06 section 5.7.2.1 new value of ZRTPSess computed as hash(ZRTPSess).
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DOC:
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Libzrtp documentation was updated up to version 0.6.2.
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libzrtp 0.6.1 03.14.2008
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--------------------------------------------------------------------------------
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ZRTP
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1. Multistream mode was implemented according to ZRTP Internet Draft 05.n:
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- new stream mode zrtp_stream_mode_t:: ZRTP_STREAM_MODE_MULT;
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- Multistream key exchange component was added with ID zrtp_pktype_id_t::
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ZRTP_PKTYPE_MULT and symbolic name ZRTP_MULT. To allow libzrtp use Multistream
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mode - ZRTP_PKTYPE_MULT have to be added to the stream profile in the first
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position;
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- According to the new draft SAS and ZRTPSess key are Session option and
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were moved to the zrtp_conn_ctx_t structure. New specification defines
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single SAS values for all streams within the session;
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- ZRTP state-machine was changed to handle Multistream mode. In .Fast. mode
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DH exchange is omitted and stream skips ZRTP_STATE_WAIT_CONFIRM1 and
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ZRTP_STATE_PENDINGSECURE for the Initiator and Responder state-machines,
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respectively;
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2. Hash preimages were added to prevent DOS attacks. See ZRTP ID sec 9.0 for detail
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information. This option is available using zrtp_set_signaling_hash() and
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zrtp_get_signaling_hash() functions.
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3. Hmac values were added to every packet to allow eliminate SAS validation
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if SIP is protected;
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4. Autosave. of the default realization of the ZRTP cache to the hard drive was
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implemented;
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5. Lot of other internal changes and improvements according to the latest ZRTP
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specification v06.
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libzrtp 0.4.5-6
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--------------------------------------------------------------------------------
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1. Full PBX support. Tested on GS-Labs Asterisk
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API:
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DOC:
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2. Resolved problem with BG ciphers compilation: initialization of AES hash tables.
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3. Fixed bug in SRTP replay protection. (Undeleted nodes for mulsy-stream encryption)
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(May resulted in a error zrtp_protocol_error_t::zrtp_status_rp_fail)
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4. Vrification is a session option. Input parameter of zrtp_set_verified() was
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changed from stream to ZRTP session structure.
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5. Fixed bug with malformed ZRTP Hello packet.
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5. fast video
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libzrtp 0.4.4 31.07.2007
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--------------------------------------------------------------------------------
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1. New extra error code for replay protection was added.
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See zrtp_status_t::zrtp_status_rp_fail.
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2. Fixed bug which may resulted in a dammage with decrypt failed 7 error. It
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was happen when libzrtp passed RTP alerts packet to the replay protection
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engine and ROC was broken.
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3. Fixed RTCP encryption/decryption.
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4. Fixed bug with RS1 and RS2 swapping when one of the sides lost RS1.
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(May resulted in a error zrtp_protocol_error_t::zrtp_error_auth_decrypt )
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libzrtp 0.4.3 06.07.2007
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--------------------------------------------------------------------------------
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1. Beta version of API for PBX support according to the latest ZRTP draft.
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Not tested. For internal development only. Follow // PBX comments;
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- secret's cache format was changed.
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2. S0 calculation according to NIST recommendations; Internal change
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- ZRTP protocol version was increased to 0.07.
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3. All libzrtp sources was audited with coverity code analyzer. http://coverity.com/
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libzrtp (0.3.9 - 0.4.2) 27.06.2008
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--------------------------------------------------------------------------------
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1. Changes according to new draft 04a. All changes are internal.
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a) new DH packets: pvi/pvr, nonce field is at the end of the DH packet.
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In "Preshared" mode both DH packets contain nonce value instead of pvi/r;
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b) new hvi value the same for all modes (DH and Preshared)
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hvi = hash(initiator's DHPart2 message | responder's Hello message);
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c) new algorithm of SAS computing: sasvalue = HMAC(hmackeyi,"SAS");
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2. New GUI based test-unite forSymbian platform
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3. Default implementation of the packet retries unite for Symbian was added
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to the libzrtp package. Except besides scheduler, libzrtp includes
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realization of some synchronization and threading routines. These
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components written in C++ and can't be linked with the library. One should
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add them to own Symbian project project.
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4. Compilation of default realization of ZRTP mutexes was separated from
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the other system interfaces. To build library with default mutexes
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BUILD_ZRTP_MUTEXES flag should be used;
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5. New clearing logic. Goals:
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API:
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- state-machine states were changed
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- goclear reason was eliminated. Now we can switch to CLEAR just on
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user action.
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- ZRTP_EVENT_IS_INITIATINGCLEAR was removed as a uperfluous event. As a
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result all event codes were changed.
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- new clear_hmac = HMAC(hmakkeyi/r, "Clear Hmac")
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6. New Errors handling logic. See updated state-macine diagram and "developers
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guide".
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API:
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- ZRTP_STATE_ERROR was added to handle error requests. Libzrtp switches
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to this state after the Error exchange. From ZRTP_STATE_ERROR stream
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cxan be started again or destroyed, depending on application strategy.
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- ZRTP_ERRORACK and ZRTP_ERROR packets were added
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- new event ZRTP_ENEVT_NO_ZRTP inform's user that other side doesn't
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support ZRTP encryption.
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7. -D WITH_STACK_MINIM compilation flag allows to minimize coasts for the
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system stack. In the most critical places dynamic allocation will be used
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instead of static variables. This option can be useful on mobile platforms
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in kernel mode, etc.
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8. Several bug fixes in scheduler. Improved built-in realization of Symbian
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platform. If you use our default realization on Symbian - please update.
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9. David A. McGrew's srtp was replaced with our own. We did it to get control
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over all crypto functions, generalize interface of crypto component. It
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allows us to port libsrtp to any platforms more smoothly. We have one
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configuration file, all platform-dependent function and definitions are
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concentrated at one place. We eliminated superfluous functionality from
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libsrtp, made it crossplatform and thread-safe. In SRTP engine we use our
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own crypto-components based on by Dr. Brian Gladman's sources. Each component
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has strong self-test function allows it to be tested on any platform and
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in any environment.
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- project structure was changed;
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- bgaes folder includes AES and SHA routines by Dr. Brian Gladman. For details
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see dgaes/howto and bg2zrtp.h files;
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- libzrtp supports external realizations of SRTP (Use zrtp_srtp.h API and flag
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-D WITHOUT_BUILTIN_SRTP );
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10. Header files were refactored: one can add just single zrtp.h include to use
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any libzrtp function or data type;
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11. Solved problem with deadlock during Video conferences. (One side starts
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negotioation with Video and another one with Audio stream)
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12. Some changes in test-unite:
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- test vectores and test-cases for all cryptio components are available;
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- zrtp_system_test.h checks environment and compilation flags
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- use ZRTP_ENABLE_TEST flag to build library with all tests
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13. Full documentation review and updating.
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14. Sources clean up and some refactoring;
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15. Fixing in "break the tie" logic. See diagrams and zrtp_preparse_commit(),
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zrtp_preparse_init_commit();
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16. Some changes according to the lates ZRTP specification:
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- sasvalue was trancated to 32 bits and used mostleft parts of the hashvalue.
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17. Small bug fixes (zrtp_can_start_dh and zrtp_can_start_preshared() mixed into
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zrtp_can_start_stream);
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18. New key derivation mechanism according to NIST standarts. See ZRTP Draft
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5.4.4 and 5.5.4.
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libzrtp (0.3.7)
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--------------------------------------------------------------------------------
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1. New, more clear and useful test-unite
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2. Eliminated zrtp_stop_protocol(). Now zrtp_done_session_ctx() includes
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protocol stopping.
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3. Some simplifications in project structure: removed zrtp_inet.h and bnase32.h,
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zrtp_iface.c was removed to src\iface folder;
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4. ZSTR_GET_VALUE should be used to convert zrtp_stringxx_t to zrtp_stringn_t;
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5. Some changes for windows CE;
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6. Changed default options: SAS base256 enabled by defauld and "staysecure" is on.
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libzrtp (0.3.6)
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--------------------------------------------------------------------------------
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FIXES:
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a) CRC now covers the whole ZRTP packet, not just a body
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b) improved names of some crypto-components in HELLO/COMMIT packets
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c) improved messages hash: hash function covers all ZRTP message with
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magic number and length fields;
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d) fixed DHPart1 and DHPart2 packets format according to last version
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of ZRTP Internet draft.
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e) fixed retain secrets sorting algorithm according to the last version
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of the internet draft.
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1. Windows CE support. Now library is fully compatible with Windows CE.
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- .\libzrtp\projects\libzrtp_wince_vc8.sln project file for MS VS 2005
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- .\libzrtp\test\WinCE contains sources of simple test-unite ( We have
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just started working in this direction and more intelligent test unite
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will be available soon. Tested on HTC S620 with Windows CE 2005 )
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2. Added previous state field to ZRTP stream structure. It can be used to
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analyze conditions of switching from one state to another. (For libzrtp
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developers only)
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API:
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- zrtp_stream_ctx_t#_prev_state was added
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- _zrtp_change_state() MUST be used to switch from one state to another
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3. Some changes in PENDING_CLEAR state handler. In case of error during
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transition from CLEAR to SECURE state-machine will switch back to CLEAR
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without the confirmation by user.
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libzrtp (0.3.5)
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--------------------------------------------------------------------------------
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Full description is in progress
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1. Support of all crypto futures according to the new ZRTP draft v 0.3. Lots
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of internal changes were provided in ZRTP kernel.
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2. Symbian support. Now you can build libzrtp and test unites on Symbian
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platforms. There are .inf and .mmp files in corresponded directories.
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(Symbian project files are a little bit row and we will appreciate any
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suggestions and advices.)
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3. ZRTP stream became more independent. You can use different configurations
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for different streams. So
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ZRTP profile: profile;
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"staysecure" flag: staysecure;
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SAS values: sas_values;
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cache TTL: cache_ttl;
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and all used crypto components were removed from session context
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(zrtp_conn_ctx_t) to stream context (zrtp_stream_ctx_t).
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API:
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- you should configure every stream in the same way as the whole session in
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previous version has been done. See zrtp_init_session_ctx()
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and zrtp_attach_stream()
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4. "Multistream" mode was replaced by "Preshared" (based on retain secrets
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from previous call. See http://zfoneproject.com/docs/ietf/draft-zimmermann-avt-zrtp-03.html#anchor19 .
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Preshared mode is available as a normal ZRTP crypto component e.g."DH3K"
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or "DH4K". If you enable Preshared mode in profile and libzrtp finds
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secrets in your cache - "Preshared" mode will be used for all next calls
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API:
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- the choice of stream mode was removed from zrtp_start_stream() and
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from zrtp_secure_stream().
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5. Integer enumerations for all crypto components e.g. Hash type, cipher type
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etc. You should use these values instead of character values for optional
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profile configuration. (as an example for enabling "preshared" mode)
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API:
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- enumerations types zrtp_hash_id, zrtp_cipher_idzrtp_atl_id,
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zrtp_pktype_id, zrtp_sas_id in zrtp_crypto.h
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- all crypto components structures now have id field and libzrtp
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operates with this field to find, register or delete crypto
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components.
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- ZRTP profile: zrtp_profile_t uses this integer values too. (list of
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crypto-components is a zero terminated array of values of necessary
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type)
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- zrtp_find_in_profile() and zrtp_find_comp() operate with component
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integer identifiers
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- there are two special functions to convert component ID to ZRTP
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character name: zrtp_comp_id2type(), zrtp_comp_type2id.
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6. Integer error codes were provided instead of 4-character values. One should
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use them to analyze zrtp_stream_ctx_t#last_error value in your ZRTP
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errors handlers.
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API:
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- zrtp_protocol_error_t was added to zrtp_error.h.
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- zrtp_stream_ctx_t#last_error now is an integer value from
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zrtp_protocol_error_t space.
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7. Special function for verification of SAS value was added. One should use
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this function to set/unset SAS verification flag from his own
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application.
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API:
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- zrtp_set_verified() was added to zrtp.h
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8. Some optimization of types was provided. Here are some possible changes which you
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need to make in your product:
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- libzrtp uses it own strings (zrtp_stringXX_t group) to operate with
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binary and character strings. In this version we made attempt to
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minimize memory coasts and replaced zrtp_string_t with zrtp_stringXX_t
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group, where XX - maximum length in bytes. zrtp_stringxx_t contains
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its length and as a result all functions for work with strings are
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type independent. So one should use one of these types to store binary
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strings and zrtp_stringn_t as a type of operand in all global functions.
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- all retain secrets holders and flags were removed to zrtp_secrets
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structure in zrtp_conn_ctx_t#secrets.
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- zrtp_packet_string4_t was replaced by zrtp_ucharXX_t group where XX -
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type length in bytes. These types are used in library for packets
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construction instead of char arrays.
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9. Packets retries synchronization was added. zrtp_retry_task_t structure
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from zrtp_types_t is used for all operations with scheduler. One should
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use #callback and #timeout fields from this structure.
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API:
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- zrtp_send_packet_later(), zrtp_cancel_send_packet_later()
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libzrtp (0.3.4)
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--------------------------------------------------------------------------------
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1. ZRTP state-macine was fully refactored. All transitions between states
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are absolutely identical to diagram attached to documentation.
|
|
DOC:
|
|
- See doc/img/png/state_mach_ext.png
|
|
|
|
2. ZRTP uses new packets format according to draft-zimmermann-avt-zrtp-03i
|
|
|
|
3. Improved some mistakes in libbn make-files for windows. Unused
|
|
functions were omitted.
|
|
|
|
4. Provided types optimization to decrease RAM memory costs.
|
|
|
|
5. Packets retries were synchronized.
|
|
|
|
6. zrtp_voip_proto_t was removed from the library
|
|
API:
|
|
- if you need this enumeration see zfone_types.h in zfone project
|
|
|
|
7. "GoClear reasons" support
|
|
|
|
8. Some internal changes according to draft-zimmermann-avt-zrtp-03i
|
|
a) Commit hash covers the whole Hello body
|
|
b) GoClear hmac includes "Reason string"
|
|
c) Confirm body encrypted by AES CDB cipher
|
|
d) Confirm hmac covers whole encrypted part of the packet
|
|
|
|
9. Use BUILD_ZRTP_DEBUG_LOG flag instead of BUILD_DEBUG_LOG to build the
|
|
library with debug logs.
|
|
|
|
libzrtp (0.3.3) 21.02.2007
|
|
--------------------------------------------------------------------------------
|
|
1. libzrtp test application refactored for better performance and usability.
|
|
For addition information see test application README file and
|
|
"libzrtp test suite" chapter in main documentation page.
|
|
|
|
2. Some changes in documentation for better English
|
|
|
|
3. Use microseconds in zrtp_time_t instead of milliseconds.
|
|
API changes:
|
|
- change zrtp_get_time() function realization if needed
|
|
|
|
4. Fixed several small mistakes
|
|
|
|
|
|
libzrtp (0.3.2) 09.02.2007
|
|
--------------------------------------------------------------------------------
|
|
1. Global context allocation removed to user space.
|
|
This was made to able RNG using before library initialization.
|
|
API changes:
|
|
- zrtp_init(), zrtp_down()
|
|
- zrtp_randstr(), zrtp_add_system_state()
|
|
|
|
2. Fixed bug in srtp SHA1 calculation for Windows.
|
|
|
|
3. Confirm and GoClear HMAC was truncated to 64 bits.
|
|
|
|
4. Calls stack minimized for library using in kernel mode
|
|
|
|
5. Default realization of secrets' cache is available. Cache was implemented
|
|
as a simple binary file and can be built using -DBUILD_DEFAULT_CACHE file.
|
|
API:
|
|
- realization at src\iface\zrtp_cache.c
|
|
DOC:
|
|
- 1.4 libZRTP setup and building
|
|
- 2.2 System-dependent functions
|
|
|
|
6. Default cross-platform realization of time-out sending unite is available.
|
|
This unite is available for Linux, MacOS and Windows. It can be built using
|
|
-DBUILD_DEFAULT_TIMER flag.
|
|
API:
|
|
- realization at src\iface\zrtp_scheduler.c
|
|
DOC:
|
|
- 1.4 libZRTP setup and building
|
|
- 2.2 System-dependent functions
|
|
|
|
7. "HOWTO libzrtp" was added to the library documentation
|
|
|
|
libzrtp (0.3.1) 06.12.2006
|
|
--------------------------------------------------------------------------------
|
|
1. Global variables were removed from c-files. Added global context
|
|
zrtp_global_ctx_t for necessary data storing. This was made to allow
|
|
to build library in some special environment as Symbian OS ed2.
|
|
DOC changes:
|
|
- 2.1.2 data structure
|
|
API changes:
|
|
- zrtp_global_ctx_t added
|
|
- zrtp_init(), zrtp_down(), zrtp_init_session(), zrtp_down_session()
|
|
|
|
2. Added multithreading support. Now libzrtp is thread-safe. About all
|
|
conditions of usage in multithreading application and synchronization
|
|
schemes see section "2.3.3 Multithreading and concurrent streams" in
|
|
developers guide.
|
|
DOC changes:
|
|
- 2.2.3 Multithreading and concurrent streams
|
|
API changes:
|
|
- mutex were added to main data structures
|
|
- mutex interface section at zrtp_iface.c, default realization at
|
|
zrtp_iface.c
|
|
|
|
3. Session configuration routine was simplified. ZRTP profile is applied on
|
|
session initialization. Some configuration functions were removed and
|
|
changed.
|
|
DOC changes:
|
|
- 2.3.1 Setup, initialization and deinitialization
|
|
API:
|
|
- zrtp_profile_autoload() removed
|
|
- zrtp_init_session(), zrtp_check_profile()
|
|
|
|
4. Default realizations of system interfaces was added (for Windows, Linux
|
|
and MacOS).
|
|
API:
|
|
- zrtp_iface.c added
|
|
|
|
5. Test suit developed.
|
|
Simple test-unite created. It runs several ZRTP sessions, enters SECURE
|
|
mode, shows statistics and is closed. To build test-suite on Unix - use C
|
|
flags -DBUILD_DEBUG_LOG -DBUILD_WITH_CFUNC -DBUILD_EMPTY_CACHE
|
|
-DBUILD_EMPTY_TIMER and configure param. --enable-test. To run tests:
|
|
make check. To build test-suite on Windows use necessary project files.
|
|
DOC changes:
|
|
- 1.4 libZRTP setup and building
|
|
API:
|
|
- Sources can be found at /test directory
|
|
|
|
6. Some changes in project structure, configuration and make files according
|
|
to new functionality.
|
|
DOC changes:
|
|
- 1.4 libZRTP setup and building
|
|
|