From d9acfc1ce677f0bfd16f1555f3762af13b8e5a7b Mon Sep 17 00:00:00 2001 From: Jeremy Harris Date: Thu, 25 Apr 2019 17:07:35 +0100 Subject: [PATCH] GnuTLS 3.6.7 cipher strings --- doc/doc-txt/ChangeLog | 9 +++++++++ src/src/tls-gnu.c | 36 +++++++++++++++++++++++++++++++++++- test/log/5821 | 4 ++-- test/runtest | 19 ++++++++++++++++++- 4 files changed, 64 insertions(+), 4 deletions(-) diff --git a/doc/doc-txt/ChangeLog b/doc/doc-txt/ChangeLog index 2c57ce64b..a85841af6 100644 --- a/doc/doc-txt/ChangeLog +++ b/doc/doc-txt/ChangeLog @@ -80,6 +80,15 @@ HS/02 Bug 2392: exigrep does case sensitive *option* processing (as it JH/15 Use unsigned when creating bitmasks in macros, to avoid build errors on some platforms for bit 31. +JH/16 GnuTLS: rework ciphersuite strings under recent library versions. Thanks + to changes apparently associated with TLS1.3 handling some of the APIs + previously used were either nonfunctional or inappropriate. Strings + like TLS1.3:ECDHE_SECP256R1__RSA_PSS_RSAE_SHA256__AES_256_GCM__AEAD:256 + and TLS1.2:ECDHE_SECP256R1__RSA_SHA256__AES_128_CBC__SHA256:128 replace + the previous TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256 . + This affects log line X= elements, the $tls_{in,out}_cipher variables, + and the use of specific cipher names in the encrypted= ACL condition. + Exim version 4.92 ----------------- diff --git a/src/src/tls-gnu.c b/src/src/tls-gnu.c index 7fc88c002..abf2c25b8 100644 --- a/src/src/tls-gnu.c +++ b/src/src/tls-gnu.c @@ -1516,11 +1516,40 @@ state->peerdn = NULL; cipher = gnutls_cipher_get(state->session); protocol = gnutls_protocol_get_version(state->session); mac = gnutls_mac_get(state->session); -kx = gnutls_kx_get(state->session); +kx = protocol < GNUTLS_TLS1_3 ? gnutls_kx_get(state->session) : 0; old_pool = store_pool; { store_pool = POOL_PERM; + +#ifdef SUPPORT_GNUTLS_SESS_DESC + { + gstring * g = NULL; + uschar * s = US gnutls_session_get_desc(state->session), c; + + /* Nikos M suggests we use this by preference. It returns like: + (TLS1.3)-(ECDHE-SECP256R1)-(RSA-PSS-RSAE-SHA256)-(AES-256-GCM) + + For partial back-compat, put a colon after the TLS version, replace the + )-( grouping with __, replace in-group - with _ and append the :keysize. */ + + /* debug_printf("peer_status: gnutls_session_get_desc %s\n", s); */ + + for (s++; (c = *s) && c != ')'; s++) g = string_catn(g, s, 1); + g = string_catn(g, US":", 1); + if (*s) s++; /* now on _ between groups */ + while ((c = *s)) + { + for (*++s && ++s; (c = *s) && c != ')'; s++) g = string_catn(g, c == '-' ? US"_" : s, 1); + /* now on ) closing group */ + if ((c = *s) && *++s == '-') g = string_catn(g, US"__", 2); + /* now on _ between groups */ + } + g = string_catn(g, US":", 1); + g = string_cat(g, string_sprintf("%d", (int) gnutls_cipher_get_key_size(cipher) * 8)); + state->ciphersuite = string_from_gstring(g); + } +#else state->ciphersuite = string_sprintf("%s:%s:%d", gnutls_protocol_get_name(protocol), gnutls_cipher_suite_get_name(kx, cipher, mac), @@ -1531,7 +1560,12 @@ old_pool = store_pool; releases did return "TLS 1.0"; play it safe, just in case. */ for (uschar * p = state->ciphersuite; *p; p++) if (isspace(*p)) *p = '-'; +#endif + +/* debug_printf("peer_status: ciphersuite %s\n", state->ciphersuite); */ + state->tlsp->cipher = state->ciphersuite; + state->tlsp->bits = gnutls_cipher_get_key_size(cipher) * 8; state->tlsp->cipher_stdname = cipher_stdname_kcm(kx, cipher, mac); } diff --git a/test/log/5821 b/test/log/5821 index d94c7c6fd..98282ecc2 100644 --- a/test/log/5821 +++ b/test/log/5821 @@ -8,7 +8,7 @@ 1999-03-02 09:44:33 10HmbB-0005vi-00 => CALLER@localhost.test.ex R=client T=send_to_server H=localhost.test.ex [127.0.0.1] X=TLS1.x:ke-RSA-AES256-SHAnnn:xxx CV=yes DN="CN=server1.example.com" C="250 OK id=10HmbC-0005vi-00" 1999-03-02 09:44:33 10HmbB-0005vi-00 Completed 1999-03-02 09:44:33 10HmbD-0005vi-00 <= CALLER@myhost.test.ex U=CALLER P=local S=sss for CALLER@dane256ee.test.ex -1999-03-02 09:44:33 10HmbD-0005vi-00 => CALLER@dane256ee.test.ex R=client T=send_to_server H=dane256ee.test.ex [ip4.ip4.ip4.ip4] X=TLS1.2:RSA_CAMELLIA_256_GCM_SHA384:256 CV=dane DN="CN=server1.example.com" C="250 OK id=10HmbE-0005vi-00" +1999-03-02 09:44:33 10HmbD-0005vi-00 => CALLER@dane256ee.test.ex R=client T=send_to_server H=dane256ee.test.ex [ip4.ip4.ip4.ip4] X=TLS1.2:RSA_CAMELLIA_256_GCM-SHAnnn:256 CV=dane DN="CN=server1.example.com" C="250 OK id=10HmbE-0005vi-00" 1999-03-02 09:44:33 10HmbD-0005vi-00 Completed ******** SERVER ******** @@ -26,6 +26,6 @@ 1999-03-02 09:44:33 10HmbC-0005vi-00 => :blackhole: R=server 1999-03-02 09:44:33 10HmbC-0005vi-00 Completed 1999-03-02 09:44:33 "rcpt ACL" -1999-03-02 09:44:33 10HmbE-0005vi-00 <= <> H=the.local.host.name (myhost.test.ex) [ip4.ip4.ip4.ip4] P=esmtps X=TLS1.2:RSA_CAMELLIA_256_GCM_SHA384:256 CV=no S=sss id=E10HmbD-0005vi-00@myhost.test.ex for CALLER@dane256ee.test.ex +1999-03-02 09:44:33 10HmbE-0005vi-00 <= <> H=the.local.host.name (myhost.test.ex) [ip4.ip4.ip4.ip4] P=esmtps X=TLS1.2:RSA_CAMELLIA_256_GCM-SHAnnn:256 CV=no S=sss id=E10HmbD-0005vi-00@myhost.test.ex for CALLER@dane256ee.test.ex 1999-03-02 09:44:33 10HmbE-0005vi-00 => :blackhole: R=server 1999-03-02 09:44:33 10HmbE-0005vi-00 Completed diff --git a/test/runtest b/test/runtest index 3b572c155..d7e4325e3 100755 --- a/test/runtest +++ b/test/runtest @@ -604,11 +604,18 @@ RESET_AFTER_EXTRA_LINE_READ: # GnuTLS have seen: # TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256 + # TLS1.3:ECDHE_SECP256R1__RSA_PSS_RSAE_SHA256__AES_256_GCM__AEAD:256 + # TLS1.3:ECDHE_X25519__RSA_PSS_RSAE_SHA256__AES_256_GCM:256 + # TLS1.3:ECDHE_PSK_SECP256R1__AES_256_GCM__AEAD:256 # # TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256 # TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128 # TLS1.2:RSA_AES_256_CBC_SHA1:256 (canonical) # TLS1.2:DHE_RSA_AES_128_CBC_SHA1:128 + # TLS1.2:ECDHE_SECP256R1__RSA_SHA256__AES_256_GCM:256 + # TLS1.2:ECDHE_SECP256R1__RSA_SHA256__AES_128_CBC__SHA256:128 + # TLS1.2:ECDHE_SECP256R1__ECDSA_SHA512__AES_256_GCM:256 + # TLS1.2:RSA__CAMELLIA_256_GCM:256 (leave the cipher name) # # X=TLS1.2:DHE_RSA_AES_256_CBC_SHA256:256 # X=TLS1.2:RSA_AES_256_CBC_SHA1:256 @@ -620,7 +627,17 @@ RESET_AFTER_EXTRA_LINE_READ: # DHE-RSA-AES256-SHA # picking latter as canonical simply because regex easier that way. s/\bDHE_RSA_AES_128_CBC_SHA1:128/RSA-AES256-SHA1:256/g; - s/TLS1.[0123]:((EC)?DHE_)?(RSA|ECDSA)_AES_(256|128)_(CBC|GCM)_SHA(1|256|384):(256|128)/TLS1.x:ke-$3-AES256-SHAnnn:xxx/g; + s/TLS1.[0123]: # TLS version + ((EC)?DHE(_((?PSK)_)?(SECP256R1|X25519))?__?)? # key-exchange + ((?RSA|ECDSA)((_PSS_RSAE)?_SHA(512|256))?__?)? # authentication + AES_(256|128)_(CBC|GCM) # cipher + (__?SHA(1|256|384))?: # PRF + (256|128) # cipher strength + /"TLS1.x:ke-" + . (defined($+{psk}) ? $+{psk} : "") + . (defined($+{auth}) ? $+{auth} : "") + . "-AES256-SHAnnn:xxx"/genx; + s/TLS1.2:RSA__CAMELLIA_256_GCM(_SHA384)?:256/TLS1.2:RSA_CAMELLIA_256_GCM-SHAnnn:256/g; s/\b(ECDHE-(RSA|ECDSA)-AES256-SHA|DHE-RSA-AES256-SHA256)\b/ke-$2-AES256-SHAnnn/g; # GnuTLS library error message changes -- 2.30.2