tor-commits May 2014

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[tor/master] Merge remote-tracking branch 'public/bug11513_024' into maint-0.2.4
by nickm＠torproject.org 08 May '14

08 May '14

commit 882893c8c3657be66b48580aa972e71dac25da5e Merge: 894c8b2 bd3db82 Author: Nick Mathewson <nickm(a)torproject.org> Date: Wed May 7 23:04:48 2014 -0400 Merge remote-tracking branch 'public/bug11513_024' into maint-0.2.4 changes/bug11513 | 12 ++++ src/common/gen_server_ciphers.py | 115 ++++++++++++++++++++++++++++++++++++++ src/common/tortls.c | 40 +++++++++---- 3 files changed, 155 insertions(+), 12 deletions(-)

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[tor/master] Merge remote-tracking branch 'public/ticket11528_024' into maint-0.2.4
by nickm＠torproject.org 08 May '14

08 May '14

commit 0ad8133a7e4f70120986f02bddb3abb6cc3d9509 Merge: 882893c 0b319de Author: Nick Mathewson <nickm(a)torproject.org> Date: Wed May 7 23:04:59 2014 -0400 Merge remote-tracking branch 'public/ticket11528_024' into maint-0.2.4 changes/ticket11528 | 6 ++++++ src/common/tortls.c | 4 ++++ 2 files changed, 10 insertions(+)

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[tor/master] Merge remote-tracking branch 'origin/maint-0.2.4'
by nickm＠torproject.org 08 May '14

08 May '14

commit 2d8377023781e5f7ba8152313b0fc3c0ea21e866 Merge: 683b80b 0ad8133 Author: Nick Mathewson <nickm(a)torproject.org> Date: Wed May 7 23:07:03 2014 -0400 Merge remote-tracking branch 'origin/maint-0.2.4'

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[tor/maint-0.2.4] Teach the get_mozilla_ciphers.py script to parse recent firefoxen
by nickm＠torproject.org 08 May '14

08 May '14

commit d00dc9f7d1b98dd80bbc890db1ddf497aae3bb9e Author: Nick Mathewson <nickm(a)torproject.org> Date: Tue Apr 8 03:19:38 2014 -0400 Teach the get_mozilla_ciphers.py script to parse recent firefoxen --- src/common/get_mozilla_ciphers.py | 30 ++++++++++++++++++++++++------ 1 file changed, 24 insertions(+), 6 deletions(-) diff --git a/src/common/get_mozilla_ciphers.py b/src/common/get_mozilla_ciphers.py index c7e9a84..0636eb3 100644 --- a/src/common/get_mozilla_ciphers.py +++ b/src/common/get_mozilla_ciphers.py @@ -41,12 +41,12 @@ fileA = open(ff('security/manager/ssl/src/nsNSSComponent.cpp'),'r') inCipherSection = False cipherLines = [] for line in fileA: - if line.startswith('static CipherPref CipherPrefs'): + if line.startswith('static const CipherPref sCipherPrefs[]'): # Get the starting boundary of the Cipher Preferences inCipherSection = True elif inCipherSection: line = line.strip() - if line.startswith('{NULL, 0}'): + if line.startswith('{ nullptr, 0}'): # At the ending boundary of the Cipher Prefs break else: @@ -56,12 +56,30 @@ fileA.close() # Parse the lines and put them into a dict ciphers = {} cipher_pref = {} +key_pending = None for line in cipherLines: - m = re.search(r'^{\s*\"([^\"]+)\",\s*(\S*)\s*}', line) + m = re.search(r'^{\s*\"([^\"]+)\",\s*(\S+)\s*(?:,\s*(true|false))?\s*}', line) if m: - key,value = m.groups() - ciphers[key] = value - cipher_pref[value] = key + assert not key_pending + key,value,enabled = m.groups() + if enabled == 'true': + ciphers[key] = value + cipher_pref[value] = key + continue + m = re.search(r'^{\s*\"([^\"]+)\",', line) + if m: + assert not key_pending + key_pending = m.group(1) + continue + m = re.search(r'^\s*(\S+)(?:,\s*(true|false))?\s*}', line) + if m: + assert key_pending + key = key_pending + value,enabled = m.groups() + key_pending = None + if enabled == 'true': + ciphers[key] = value + cipher_pref[value] = key #### # Now find the correct order for the ciphers

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[tor/maint-0.2.4] Update ciphers.inc to match ff28
by nickm＠torproject.org 08 May '14

08 May '14

commit 4231729176c63d28f7adb61074f79464e2ee73a7 Author: Nick Mathewson <nickm(a)torproject.org> Date: Tue Apr 8 11:31:48 2014 -0400 Update ciphers.inc to match ff28 The major changes are to re-order some ciphers, to drop the ECDH suites (note: *not* ECDHE: ECDHE is still there), to kill off some made-up stuff (like the SSL_RSA_FIPS_WITH_3DES_EDE_CBC_SHA suite), to drop some of the DSS suites... *and* to enable the ECDHE+GCM ciphersuites. This change is autogenerated by get_mozilla_ciphers.py from Firefox 28 and OpenSSL 1.0.1g. Resolves ticket 11438. --- changes/ff28_ciphers | 6 ++ src/common/ciphers.inc | 169 ++++++++++++++++-------------------------------- 2 files changed, 60 insertions(+), 115 deletions(-) diff --git a/changes/ff28_ciphers b/changes/ff28_ciphers new file mode 100644 index 0000000..05eb4e9 --- /dev/null +++ b/changes/ff28_ciphers @@ -0,0 +1,6 @@ + o Minor features (performance, compatibility): + - Update the list of TLS cipehrsuites that a client advertises + to match those advertised by Firefox 28. This enables selection of + (fast) GCM ciphersuites, disables some strange old ciphers, and + disables the ECDH (not to be confused with ECDHE) ciphersuites. + Resolves ticket 11438. diff --git a/src/common/ciphers.inc b/src/common/ciphers.inc index 137d78b..ab4ac40 100644 --- a/src/common/ciphers.inc +++ b/src/common/ciphers.inc @@ -4,86 +4,51 @@ * * This file was automatically generated by get_mozilla_ciphers.py. */ -#ifdef TLS1_TXT_ECDHE_ECDSA_WITH_AES_256_CBC_SHA - CIPHER(0xc00a, TLS1_TXT_ECDHE_ECDSA_WITH_AES_256_CBC_SHA) -#else - XCIPHER(0xc00a, TLS1_TXT_ECDHE_ECDSA_WITH_AES_256_CBC_SHA) -#endif -#ifdef TLS1_TXT_ECDHE_RSA_WITH_AES_256_CBC_SHA - CIPHER(0xc014, TLS1_TXT_ECDHE_RSA_WITH_AES_256_CBC_SHA) -#else - XCIPHER(0xc014, TLS1_TXT_ECDHE_RSA_WITH_AES_256_CBC_SHA) -#endif -#ifdef TLS1_TXT_DHE_RSA_WITH_CAMELLIA_256_CBC_SHA - CIPHER(0x0088, TLS1_TXT_DHE_RSA_WITH_CAMELLIA_256_CBC_SHA) -#else - XCIPHER(0x0088, TLS1_TXT_DHE_RSA_WITH_CAMELLIA_256_CBC_SHA) -#endif -#ifdef TLS1_TXT_DHE_DSS_WITH_CAMELLIA_256_CBC_SHA - CIPHER(0x0087, TLS1_TXT_DHE_DSS_WITH_CAMELLIA_256_CBC_SHA) +#ifdef TLS1_TXT_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256 + CIPHER(0xc02b, TLS1_TXT_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256) #else - XCIPHER(0x0087, TLS1_TXT_DHE_DSS_WITH_CAMELLIA_256_CBC_SHA) + XCIPHER(0xc02b, TLS1_TXT_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256) #endif -#ifdef TLS1_TXT_DHE_RSA_WITH_AES_256_SHA - CIPHER(0x0039, TLS1_TXT_DHE_RSA_WITH_AES_256_SHA) +#ifdef TLS1_TXT_ECDHE_RSA_WITH_AES_128_GCM_SHA256 + CIPHER(0xc02f, TLS1_TXT_ECDHE_RSA_WITH_AES_128_GCM_SHA256) #else - XCIPHER(0x0039, TLS1_TXT_DHE_RSA_WITH_AES_256_SHA) + XCIPHER(0xc02f, TLS1_TXT_ECDHE_RSA_WITH_AES_128_GCM_SHA256) #endif -#ifdef TLS1_TXT_DHE_DSS_WITH_AES_256_SHA - CIPHER(0x0038, TLS1_TXT_DHE_DSS_WITH_AES_256_SHA) +#ifdef TLS1_TXT_ECDHE_ECDSA_WITH_AES_256_CBC_SHA + CIPHER(0xc00a, TLS1_TXT_ECDHE_ECDSA_WITH_AES_256_CBC_SHA) #else - XCIPHER(0x0038, TLS1_TXT_DHE_DSS_WITH_AES_256_SHA) + XCIPHER(0xc00a, TLS1_TXT_ECDHE_ECDSA_WITH_AES_256_CBC_SHA) #endif -#ifdef TLS1_TXT_ECDH_RSA_WITH_AES_256_CBC_SHA - CIPHER(0xc00f, TLS1_TXT_ECDH_RSA_WITH_AES_256_CBC_SHA) +#ifdef TLS1_TXT_ECDHE_ECDSA_WITH_AES_128_CBC_SHA + CIPHER(0xc009, TLS1_TXT_ECDHE_ECDSA_WITH_AES_128_CBC_SHA) #else - XCIPHER(0xc00f, TLS1_TXT_ECDH_RSA_WITH_AES_256_CBC_SHA) + XCIPHER(0xc009, TLS1_TXT_ECDHE_ECDSA_WITH_AES_128_CBC_SHA) #endif -#ifdef TLS1_TXT_ECDH_ECDSA_WITH_AES_256_CBC_SHA - CIPHER(0xc005, TLS1_TXT_ECDH_ECDSA_WITH_AES_256_CBC_SHA) +#ifdef TLS1_TXT_ECDHE_RSA_WITH_AES_128_CBC_SHA + CIPHER(0xc013, TLS1_TXT_ECDHE_RSA_WITH_AES_128_CBC_SHA) #else - XCIPHER(0xc005, TLS1_TXT_ECDH_ECDSA_WITH_AES_256_CBC_SHA) + XCIPHER(0xc013, TLS1_TXT_ECDHE_RSA_WITH_AES_128_CBC_SHA) #endif -#ifdef TLS1_TXT_RSA_WITH_CAMELLIA_256_CBC_SHA - CIPHER(0x0084, TLS1_TXT_RSA_WITH_CAMELLIA_256_CBC_SHA) +#ifdef TLS1_TXT_ECDHE_RSA_WITH_AES_256_CBC_SHA + CIPHER(0xc014, TLS1_TXT_ECDHE_RSA_WITH_AES_256_CBC_SHA) #else - XCIPHER(0x0084, TLS1_TXT_RSA_WITH_CAMELLIA_256_CBC_SHA) + XCIPHER(0xc014, TLS1_TXT_ECDHE_RSA_WITH_AES_256_CBC_SHA) #endif -#ifdef TLS1_TXT_RSA_WITH_AES_256_SHA - CIPHER(0x0035, TLS1_TXT_RSA_WITH_AES_256_SHA) +#ifdef TLS1_TXT_ECDHE_RSA_WITH_DES_192_CBC3_SHA + CIPHER(0xc012, TLS1_TXT_ECDHE_RSA_WITH_DES_192_CBC3_SHA) #else - XCIPHER(0x0035, TLS1_TXT_RSA_WITH_AES_256_SHA) + XCIPHER(0xc012, TLS1_TXT_ECDHE_RSA_WITH_DES_192_CBC3_SHA) #endif #ifdef TLS1_TXT_ECDHE_ECDSA_WITH_RC4_128_SHA CIPHER(0xc007, TLS1_TXT_ECDHE_ECDSA_WITH_RC4_128_SHA) #else XCIPHER(0xc007, TLS1_TXT_ECDHE_ECDSA_WITH_RC4_128_SHA) #endif -#ifdef TLS1_TXT_ECDHE_ECDSA_WITH_AES_128_CBC_SHA - CIPHER(0xc009, TLS1_TXT_ECDHE_ECDSA_WITH_AES_128_CBC_SHA) -#else - XCIPHER(0xc009, TLS1_TXT_ECDHE_ECDSA_WITH_AES_128_CBC_SHA) -#endif #ifdef TLS1_TXT_ECDHE_RSA_WITH_RC4_128_SHA CIPHER(0xc011, TLS1_TXT_ECDHE_RSA_WITH_RC4_128_SHA) #else XCIPHER(0xc011, TLS1_TXT_ECDHE_RSA_WITH_RC4_128_SHA) #endif -#ifdef TLS1_TXT_ECDHE_RSA_WITH_AES_128_CBC_SHA - CIPHER(0xc013, TLS1_TXT_ECDHE_RSA_WITH_AES_128_CBC_SHA) -#else - XCIPHER(0xc013, TLS1_TXT_ECDHE_RSA_WITH_AES_128_CBC_SHA) -#endif -#ifdef TLS1_TXT_DHE_RSA_WITH_CAMELLIA_128_CBC_SHA - CIPHER(0x0045, TLS1_TXT_DHE_RSA_WITH_CAMELLIA_128_CBC_SHA) -#else - XCIPHER(0x0045, TLS1_TXT_DHE_RSA_WITH_CAMELLIA_128_CBC_SHA) -#endif -#ifdef TLS1_TXT_DHE_DSS_WITH_CAMELLIA_128_CBC_SHA - CIPHER(0x0044, TLS1_TXT_DHE_DSS_WITH_CAMELLIA_128_CBC_SHA) -#else - XCIPHER(0x0044, TLS1_TXT_DHE_DSS_WITH_CAMELLIA_128_CBC_SHA) -#endif #ifdef TLS1_TXT_DHE_RSA_WITH_AES_128_SHA CIPHER(0x0033, TLS1_TXT_DHE_RSA_WITH_AES_128_SHA) #else @@ -94,89 +59,63 @@ #else XCIPHER(0x0032, TLS1_TXT_DHE_DSS_WITH_AES_128_SHA) #endif -#ifdef TLS1_TXT_ECDH_RSA_WITH_RC4_128_SHA - CIPHER(0xc00c, TLS1_TXT_ECDH_RSA_WITH_RC4_128_SHA) -#else - XCIPHER(0xc00c, TLS1_TXT_ECDH_RSA_WITH_RC4_128_SHA) -#endif -#ifdef TLS1_TXT_ECDH_RSA_WITH_AES_128_CBC_SHA - CIPHER(0xc00e, TLS1_TXT_ECDH_RSA_WITH_AES_128_CBC_SHA) -#else - XCIPHER(0xc00e, TLS1_TXT_ECDH_RSA_WITH_AES_128_CBC_SHA) -#endif -#ifdef TLS1_TXT_ECDH_ECDSA_WITH_RC4_128_SHA - CIPHER(0xc002, TLS1_TXT_ECDH_ECDSA_WITH_RC4_128_SHA) -#else - XCIPHER(0xc002, TLS1_TXT_ECDH_ECDSA_WITH_RC4_128_SHA) -#endif -#ifdef TLS1_TXT_ECDH_ECDSA_WITH_AES_128_CBC_SHA - CIPHER(0xc004, TLS1_TXT_ECDH_ECDSA_WITH_AES_128_CBC_SHA) +#ifdef TLS1_TXT_DHE_RSA_WITH_CAMELLIA_128_CBC_SHA + CIPHER(0x0045, TLS1_TXT_DHE_RSA_WITH_CAMELLIA_128_CBC_SHA) #else - XCIPHER(0xc004, TLS1_TXT_ECDH_ECDSA_WITH_AES_128_CBC_SHA) + XCIPHER(0x0045, TLS1_TXT_DHE_RSA_WITH_CAMELLIA_128_CBC_SHA) #endif -#ifdef TLS1_TXT_RSA_WITH_SEED_SHA - CIPHER(0x0096, TLS1_TXT_RSA_WITH_SEED_SHA) +#ifdef TLS1_TXT_DHE_RSA_WITH_AES_256_SHA + CIPHER(0x0039, TLS1_TXT_DHE_RSA_WITH_AES_256_SHA) #else - XCIPHER(0x0096, TLS1_TXT_RSA_WITH_SEED_SHA) + XCIPHER(0x0039, TLS1_TXT_DHE_RSA_WITH_AES_256_SHA) #endif -#ifdef TLS1_TXT_RSA_WITH_CAMELLIA_128_CBC_SHA - CIPHER(0x0041, TLS1_TXT_RSA_WITH_CAMELLIA_128_CBC_SHA) +#ifdef TLS1_TXT_DHE_DSS_WITH_AES_256_SHA + CIPHER(0x0038, TLS1_TXT_DHE_DSS_WITH_AES_256_SHA) #else - XCIPHER(0x0041, TLS1_TXT_RSA_WITH_CAMELLIA_128_CBC_SHA) + XCIPHER(0x0038, TLS1_TXT_DHE_DSS_WITH_AES_256_SHA) #endif -#ifdef SSL3_TXT_RSA_RC4_128_MD5 - CIPHER(0x0004, SSL3_TXT_RSA_RC4_128_MD5) +#ifdef TLS1_TXT_DHE_RSA_WITH_CAMELLIA_256_CBC_SHA + CIPHER(0x0088, TLS1_TXT_DHE_RSA_WITH_CAMELLIA_256_CBC_SHA) #else - XCIPHER(0x0004, SSL3_TXT_RSA_RC4_128_MD5) + XCIPHER(0x0088, TLS1_TXT_DHE_RSA_WITH_CAMELLIA_256_CBC_SHA) #endif -#ifdef SSL3_TXT_RSA_RC4_128_SHA - CIPHER(0x0005, SSL3_TXT_RSA_RC4_128_SHA) +#ifdef SSL3_TXT_EDH_RSA_DES_192_CBC3_SHA + CIPHER(0x0016, SSL3_TXT_EDH_RSA_DES_192_CBC3_SHA) #else - XCIPHER(0x0005, SSL3_TXT_RSA_RC4_128_SHA) + XCIPHER(0x0016, SSL3_TXT_EDH_RSA_DES_192_CBC3_SHA) #endif #ifdef TLS1_TXT_RSA_WITH_AES_128_SHA CIPHER(0x002f, TLS1_TXT_RSA_WITH_AES_128_SHA) #else XCIPHER(0x002f, TLS1_TXT_RSA_WITH_AES_128_SHA) #endif -#ifdef TLS1_TXT_ECDHE_ECDSA_WITH_DES_192_CBC3_SHA - CIPHER(0xc008, TLS1_TXT_ECDHE_ECDSA_WITH_DES_192_CBC3_SHA) -#else - XCIPHER(0xc008, TLS1_TXT_ECDHE_ECDSA_WITH_DES_192_CBC3_SHA) -#endif -#ifdef TLS1_TXT_ECDHE_RSA_WITH_DES_192_CBC3_SHA - CIPHER(0xc012, TLS1_TXT_ECDHE_RSA_WITH_DES_192_CBC3_SHA) -#else - XCIPHER(0xc012, TLS1_TXT_ECDHE_RSA_WITH_DES_192_CBC3_SHA) -#endif -#ifdef SSL3_TXT_EDH_RSA_DES_192_CBC3_SHA - CIPHER(0x0016, SSL3_TXT_EDH_RSA_DES_192_CBC3_SHA) +#ifdef TLS1_TXT_RSA_WITH_CAMELLIA_128_CBC_SHA + CIPHER(0x0041, TLS1_TXT_RSA_WITH_CAMELLIA_128_CBC_SHA) #else - XCIPHER(0x0016, SSL3_TXT_EDH_RSA_DES_192_CBC3_SHA) + XCIPHER(0x0041, TLS1_TXT_RSA_WITH_CAMELLIA_128_CBC_SHA) #endif -#ifdef SSL3_TXT_EDH_DSS_DES_192_CBC3_SHA - CIPHER(0x0013, SSL3_TXT_EDH_DSS_DES_192_CBC3_SHA) +#ifdef TLS1_TXT_RSA_WITH_AES_256_SHA + CIPHER(0x0035, TLS1_TXT_RSA_WITH_AES_256_SHA) #else - XCIPHER(0x0013, SSL3_TXT_EDH_DSS_DES_192_CBC3_SHA) + XCIPHER(0x0035, TLS1_TXT_RSA_WITH_AES_256_SHA) #endif -#ifdef TLS1_TXT_ECDH_RSA_WITH_DES_192_CBC3_SHA - CIPHER(0xc00d, TLS1_TXT_ECDH_RSA_WITH_DES_192_CBC3_SHA) +#ifdef TLS1_TXT_RSA_WITH_CAMELLIA_256_CBC_SHA + CIPHER(0x0084, TLS1_TXT_RSA_WITH_CAMELLIA_256_CBC_SHA) #else - XCIPHER(0xc00d, TLS1_TXT_ECDH_RSA_WITH_DES_192_CBC3_SHA) + XCIPHER(0x0084, TLS1_TXT_RSA_WITH_CAMELLIA_256_CBC_SHA) #endif -#ifdef TLS1_TXT_ECDH_ECDSA_WITH_DES_192_CBC3_SHA - CIPHER(0xc003, TLS1_TXT_ECDH_ECDSA_WITH_DES_192_CBC3_SHA) +#ifdef SSL3_TXT_RSA_DES_192_CBC3_SHA + CIPHER(0x000a, SSL3_TXT_RSA_DES_192_CBC3_SHA) #else - XCIPHER(0xc003, TLS1_TXT_ECDH_ECDSA_WITH_DES_192_CBC3_SHA) + XCIPHER(0x000a, SSL3_TXT_RSA_DES_192_CBC3_SHA) #endif -/* No openssl macro found for 0xfeff */ -#ifdef SSL_RSA_FIPS_WITH_3DES_EDE_CBC_SHA - CIPHER(0xfeff, SSL_RSA_FIPS_WITH_3DES_EDE_CBC_SHA) +#ifdef SSL3_TXT_RSA_RC4_128_SHA + CIPHER(0x0005, SSL3_TXT_RSA_RC4_128_SHA) #else - XCIPHER(0xfeff, SSL_RSA_FIPS_WITH_3DES_EDE_CBC_SHA) + XCIPHER(0x0005, SSL3_TXT_RSA_RC4_128_SHA) #endif -#ifdef SSL3_TXT_RSA_DES_192_CBC3_SHA - CIPHER(0x000a, SSL3_TXT_RSA_DES_192_CBC3_SHA) +#ifdef SSL3_TXT_RSA_RC4_128_MD5 + CIPHER(0x0004, SSL3_TXT_RSA_RC4_128_MD5) #else - XCIPHER(0x000a, SSL3_TXT_RSA_DES_192_CBC3_SHA) + XCIPHER(0x0004, SSL3_TXT_RSA_RC4_128_MD5) #endif

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[tor/maint-0.2.4] Elevate server TLS cipher preferences over client
by nickm＠torproject.org 08 May '14

08 May '14

commit 0b319de60f7c80ab5c37c57af182f4f710ceb5b7 Author: Nick Mathewson <nickm(a)torproject.org> Date: Thu Apr 17 10:23:18 2014 -0400 Elevate server TLS cipher preferences over client The server cipher list is (thanks to #11513) chosen systematically to put the best choices for Tor first. The client cipher list is chosen to resemble a browser. So let's set SSL_OP_CIPHER_SERVER_PREFERENCE to have the servers pick according to their own preference order. --- changes/ticket11528 | 6 ++++++ src/common/tortls.c | 4 ++++ 2 files changed, 10 insertions(+) diff --git a/changes/ticket11528 b/changes/ticket11528 new file mode 100644 index 0000000..15daad9 --- /dev/null +++ b/changes/ticket11528 @@ -0,0 +1,6 @@ + o Minor features: + - Servers now trust themselves to have a better view than clients of + which TLS ciphersuites to choose. (Thanks to #11513, the server + list is now well-considered, whereas the client list has been + chosen mainly for anti-fingerprinting purposes.) Resolves ticket + 11528. diff --git a/src/common/tortls.c b/src/common/tortls.c index 886ee0d..8eb524e 100644 --- a/src/common/tortls.c +++ b/src/common/tortls.c @@ -1261,6 +1261,10 @@ tor_tls_context_new(crypto_pk_t *identity, unsigned int key_lifetime, goto error; SSL_CTX_set_options(result->ctx, SSL_OP_NO_SSLv2); + /* Prefer the server's ordering of ciphers: the client's ordering has + * historically been chosen for fingerprinting resistance. */ + SSL_CTX_set_options(result->ctx, SSL_OP_CIPHER_SERVER_PREFERENCE); + /* Disable TLS1.1 and TLS1.2 if they exist. We need to do this to * workaround a bug present in all OpenSSL 1.0.1 versions (as of 1 * June 2012), wherein renegotiating while using one of these TLS

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[tor/maint-0.2.4] Merge remote-tracking branch 'public/update_ciphers_ff28' into maint-0.2.4
by nickm＠torproject.org 08 May '14

08 May '14

commit 894c8b22662131817e5d7383740b2b285f9b7491 Merge: 14bc6e8 4231729 Author: Nick Mathewson <nickm(a)torproject.org> Date: Wed May 7 23:04:22 2014 -0400 Merge remote-tracking branch 'public/update_ciphers_ff28' into maint-0.2.4 changes/ff28_ciphers | 6 ++ src/common/ciphers.inc | 169 ++++++++++++------------------------- src/common/get_mozilla_ciphers.py | 30 +++++-- 3 files changed, 84 insertions(+), 121 deletions(-)

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[tor/maint-0.2.4] New sort order for server choice of ciphersuites.
by nickm＠torproject.org 08 May '14

08 May '14

commit bd3db82906a2efcd678b5f4b61fef26c93828777 Author: Nick Mathewson <nickm(a)torproject.org> Date: Mon Apr 14 14:10:05 2014 -0400 New sort order for server choice of ciphersuites. Back in 175b2678, we allowed servers to recognize clients who are telling them the truth about their ciphersuites, and select the best cipher from on that list. This implemented the server side of proposal 198. In bugs 11492, 11498, and 11499, cypherpunks found a bunch of mistakes and omissions and typos in the UNRESTRICTED_SERVER_CIPHER_LIST we had. In #11513, I found a couple more. Rather than try to hand-edit this list, I wrote a short python script to generate our ciphersuite preferences from the openssl headers. The new rules are: * Require forward secrecy. * Require RSA (since our servers only configure RSA keys) * Require AES or 3DES. (This means, reject RC4, DES, SEED, CAMELLIA, and NULL.) * No export ciphersuites. Then: * Prefer AES to 3DES. * If both suites have the same cipher, prefer ECDHE to DHE. * If both suites have the same DHE group type, prefer GCM to CBC. * If both suites have the same cipher mode, prefer SHA384 to SHA256 to SHA1. * If both suites have the same digest, prefer AES256 to AES128. --- changes/bug11513 | 12 ++++ src/common/gen_server_ciphers.py | 115 ++++++++++++++++++++++++++++++++++++++ src/common/tortls.c | 40 +++++++++---- 3 files changed, 155 insertions(+), 12 deletions(-) diff --git a/changes/bug11513 b/changes/bug11513 new file mode 100644 index 0000000..820c026 --- /dev/null +++ b/changes/bug11513 @@ -0,0 +1,12 @@ + o Major bugfixes: + - Generate the server's preference list for ciphersuites + automatically based on uniform criteria, and considering all + OpenSSL ciphersuites with acceptable strength and forward + secrecy. (The sort order is: prefer AES to 3DES; break ties by + preferring ECDHE to DHE; break ties by preferring GCM to CBC; + break ties by preferring SHA384 to SHA256 to SHA1; and finally, + break ties by preferring AES256 to AES128.) This resolves bugs + #11513, #11492, #11498, #11499. Bugs reported by 'cypherpunks'. + Bugfix on 0.2.4.8-alpha. + + diff --git a/src/common/gen_server_ciphers.py b/src/common/gen_server_ciphers.py new file mode 100755 index 0000000..97ed9d0 --- /dev/null +++ b/src/common/gen_server_ciphers.py @@ -0,0 +1,115 @@ +#!/usr/bin/python +# Copyright 2014, The Tor Project, Inc +# See LICENSE for licensing information + +# This script parses openssl headers to find ciphersuite names, determines +# which ones we should be willing to use as a server, and sorts them according +# to preference rules. +# +# Run it on all the files in your openssl include directory. + +import re +import sys + +EPHEMERAL_INDICATORS = [ "_EDH_", "_DHE_", "_ECDHE_" ] +BAD_STUFF = [ "_DES_40_", "MD5", "_RC4_", "_DES_64_", + "_SEED_", "_CAMELLIA_", "_NULL" ] + +# these never get #ifdeffed. +MANDATORY = [ + "TLS1_TXT_DHE_RSA_WITH_AES_256_SHA", + "TLS1_TXT_DHE_RSA_WITH_AES_128_SHA", + "SSL3_TXT_EDH_RSA_DES_192_CBC3_SHA", +] + +def find_ciphers(filename): + with open(filename) as f: + for line in f: + m = re.search(r'(?:SSL3|TLS1)_TXT_\w+', line) + if m: + yield m.group(0) + +def usable_cipher(ciph): + ephemeral = False + for e in EPHEMERAL_INDICATORS: + if e in ciph: + ephemeral = True + if not ephemeral: + return False + + if "_RSA_" not in ciph: + return False + + for b in BAD_STUFF: + if b in ciph: + return False + return True + +# All fields we sort on, in order of priority. +FIELDS = [ 'cipher', 'fwsec', 'mode', 'digest', 'bitlength' ] +# Map from sorted fields to recognized value in descending order of goodness +FIELD_VALS = { 'cipher' : [ 'AES', 'DES'], + 'fwsec' : [ 'ECDHE', 'DHE' ], + 'mode' : [ 'GCM', 'CBC' ], + 'digest' : [ 'SHA384', 'SHA256', 'SHA' ], + 'bitlength' : [ '256', '128', '192' ], +} + +class Ciphersuite(object): + def __init__(self, name, fwsec, cipher, bitlength, mode, digest): + self.name = name + self.fwsec = fwsec + self.cipher = cipher + self.bitlength = bitlength + self.mode = mode + self.digest = digest + + for f in FIELDS: + assert(getattr(self, f) in FIELD_VALS[f]) + + def sort_key(self): + return tuple(FIELD_VALS[f].index(getattr(self,f)) for f in FIELDS) + + +def parse_cipher(ciph): + m = re.match('(?:TLS1|SSL3)_TXT_(EDH|DHE|ECDHE)_RSA(?:_WITH)?_(AES|DES)_(256|128|192)(|_CBC|_CBC3|_GCM)_(SHA|SHA256|SHA384)$', ciph) + + if not m: + print "/* Couldn't parse %s ! */"%ciph + return None + + fwsec, cipher, bits, mode, digest = m.groups() + if fwsec == 'EDH': + fwsec = 'DHE' + + if mode in [ '_CBC3', '_CBC', '' ]: + mode = 'CBC' + elif mode == '_GCM': + mode = 'GCM' + + return Ciphersuite(ciph, fwsec, cipher, bits, mode, digest) + +ALL_CIPHERS = [] + +for fname in sys.argv[1:]: + ALL_CIPHERS += (parse_cipher(c) + for c in find_ciphers(fname) + if usable_cipher(c) ) + +ALL_CIPHERS.sort(key=Ciphersuite.sort_key) + +for c in ALL_CIPHERS: + if c is ALL_CIPHERS[-1]: + colon = ';' + else: + colon = ' ":"' + + if c.name in MANDATORY: + print " /* Required */" + print ' %s%s'%(c.name,colon) + else: + print "#ifdef %s"%c.name + print ' %s%s'%(c.name,colon) + print "#endif" + + diff --git a/src/common/tortls.c b/src/common/tortls.c index 886ee0d..bbbf6a5 100644 --- a/src/common/tortls.c +++ b/src/common/tortls.c @@ -714,31 +714,47 @@ tor_tls_create_certificate(crypto_pk_t *rsa, /** List of ciphers that servers should select from when we actually have * our choice of what cipher to use. */ const char UNRESTRICTED_SERVER_CIPHER_LIST[] = -#ifdef TLS1_TXT_ECDHE_RSA_WITH_AES_256_CHC_SHA - TLS1_TXT_ECDHE_RSA_WITH_AES_256_CBC_SHA ":" -#endif + /* This list is autogenerated with the gen_server_ciphers.py script; + * don't hand-edit it. */ #ifdef TLS1_TXT_ECDHE_RSA_WITH_AES_256_GCM_SHA384 TLS1_TXT_ECDHE_RSA_WITH_AES_256_GCM_SHA384 ":" #endif +#ifdef TLS1_TXT_ECDHE_RSA_WITH_AES_128_GCM_SHA256 + TLS1_TXT_ECDHE_RSA_WITH_AES_128_GCM_SHA256 ":" +#endif +#ifdef TLS1_TXT_ECDHE_RSA_WITH_AES_256_SHA384 + TLS1_TXT_ECDHE_RSA_WITH_AES_256_SHA384 ":" +#endif #ifdef TLS1_TXT_ECDHE_RSA_WITH_AES_128_SHA256 TLS1_TXT_ECDHE_RSA_WITH_AES_128_SHA256 ":" #endif +#ifdef TLS1_TXT_ECDHE_RSA_WITH_AES_256_CBC_SHA + TLS1_TXT_ECDHE_RSA_WITH_AES_256_CBC_SHA ":" +#endif #ifdef TLS1_TXT_ECDHE_RSA_WITH_AES_128_CBC_SHA TLS1_TXT_ECDHE_RSA_WITH_AES_128_CBC_SHA ":" #endif -#ifdef TLS1_TXT_ECDHE_RSA_WITH_AES_128_GCM_SHA256 - TLS1_TXT_ECDHE_RSA_WITH_AES_128_GCM_SHA256 +#ifdef TLS1_TXT_DHE_RSA_WITH_AES_256_GCM_SHA384 + TLS1_TXT_DHE_RSA_WITH_AES_256_GCM_SHA384 ":" +#endif +#ifdef TLS1_TXT_DHE_RSA_WITH_AES_128_GCM_SHA256 + TLS1_TXT_DHE_RSA_WITH_AES_128_GCM_SHA256 ":" +#endif +#ifdef TLS1_TXT_DHE_RSA_WITH_AES_256_SHA256 + TLS1_TXT_DHE_RSA_WITH_AES_256_SHA256 ":" +#endif +#ifdef TLS1_TXT_DHE_RSA_WITH_AES_128_SHA256 + TLS1_TXT_DHE_RSA_WITH_AES_128_SHA256 ":" #endif -//#if TLS1_TXT_ECDHE_RSA_WITH_RC4_128_SHA -// TLS1_TXT_ECDHE_RSA_WITH_RC4_128_SHA ":" -//#endif - /* These next two are mandatory. */ - TLS1_TXT_DHE_RSA_WITH_AES_256_SHA ":" - TLS1_TXT_DHE_RSA_WITH_AES_128_SHA ":" + /* Required */ + TLS1_TXT_DHE_RSA_WITH_AES_256_SHA ":" + /* Required */ + TLS1_TXT_DHE_RSA_WITH_AES_128_SHA ":" #ifdef TLS1_TXT_ECDHE_RSA_WITH_DES_192_CBC3_SHA TLS1_TXT_ECDHE_RSA_WITH_DES_192_CBC3_SHA ":" #endif - SSL3_TXT_EDH_RSA_DES_192_CBC3_SHA; + /* Required */ + SSL3_TXT_EDH_RSA_DES_192_CBC3_SHA; /* Note: to set up your own private testing network with link crypto * disabled, set your Tors' cipher list to

1 0

[tor/maint-0.2.4] Merge remote-tracking branch 'public/bug11513_024' into maint-0.2.4
by nickm＠torproject.org 08 May '14

08 May '14

1 0

[tor/maint-0.2.4] Merge remote-tracking branch 'public/ticket11528_024' into maint-0.2.4
by nickm＠torproject.org 08 May '14

08 May '14

1 0

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