Module: sip-router Branch: kamailio_3.0 Commit: aff7ce53ed0dc9a63143f45fa546b7e2640f82b1 URL: http://git.sip-router.org/cgi-bin/gitweb.cgi/sip-router/?a=commit;h=aff7ce53...

Author: Andrei Pelinescu-Onciul andrei@iptel.org Committer: Daniel-Constantin Mierla miconda@gmail.com Date: Tue Feb 23 16:10:21 2010 +0100

tls: disable kerberos more thoroughly [fix]

Older openssl versions (< 0.9.8e release) have a bug in the kerberos code (it uses the wrong malloc, for more details see openssl bug # 1467). While there is already a workaround for this openssl bug in the sr code (see commits 36cb8f & 560a42), in some situations this workaround causes another bug (crash on connection opening when openssl is compiled with kerberos support and kerberos is enabled for key exchange). The current fix will disable automatically all the ciphers containing KRB5 if the openssl version is < 0.9.8e beta1 or it is between 0.9.9-dev and 0.9.9-beta1. It iss equivalent to setting cipher_list to "<prev. value>:!KRB5".

Impact: this fix is needed only if openssl is compiled with kerberos support and the version is < 0.9.8e. It also affects at least CentOS users with openssl-0.9.8e-12.el5_4.1 (in the centos openssl package they play some strange games with the version and report 0.9.8b via SSLeay).

Tested-by: Klaus Darilion klaus.mailinglists at pernau.at Reported-by: Klaus Darilion klaus.mailinglists at pernau.at Reported-by: Andreas Rehbein rehbein at e-technik.org Reported-by: Martin Koenig koenig starface.de (cherry picked from commit 51ee5da9ebf09447f71d4393f7c5b703305ff46d)

---

modules/tls/tls_domain.c | 35 +++++++++++++++++++++++++++++++---- 1 files changed, 31 insertions(+), 4 deletions(-)

diff --git a/modules/tls/tls_domain.c b/modules/tls/tls_domain.c index db35eda..628b3e2 100644 --- a/modules/tls/tls_domain.c +++ b/modules/tls/tls_domain.c @@ -269,6 +269,10 @@ static int load_ca_list(tls_domain_t* d) return 0; }

+#define C_DEF_NO_KRB5 "DEFAULT:!KRB5" +#define C_DEF_NO_KRB5_LEN (sizeof(C_DEF_NO_KRB5)-1) +#define C_NO_KRB5_SUFFIX ":!KRB5" +#define C_NO_KRB5_SUFFIX_LEN (sizeof(C_NO_KRB5_SUFFIX)-1)

/* * Configure cipher list @@ -277,12 +281,35 @@ static int set_cipher_list(tls_domain_t* d) { int i; int procs_no; - - if (!d->cipher_list.s) return 0; + char* cipher_list; + + cipher_list=d->cipher_list.s; +#ifdef TLS_KSSL_WORKARROUND + if (openssl_kssl_malloc_bug) { /* is openssl bug #1467 present ? */ + if (d->cipher_list.s==0) { + /* use "DEFAULT:!KRB5" */ + cipher_list="DEFAULT:!KRB5"; + } else { + /* append ":!KRB5" */ + cipher_list=shm_malloc(d->cipher_list.len+C_NO_KRB5_SUFFIX_LEN+1); + if (cipher_list) { + memcpy(cipher_list, d->cipher_list.s, d->cipher_list.len); + memcpy(cipher_list+d->cipher_list.len, C_NO_KRB5_SUFFIX, + C_NO_KRB5_SUFFIX_LEN); + cipher_list[d->cipher_list.len+C_NO_KRB5_SUFFIX_LEN]=0; + shm_free(d->cipher_list.s); + d->cipher_list.s=cipher_list; + d->cipher_list.len+=C_NO_KRB5_SUFFIX_LEN; + } + } + } +#endif /* TLS_KSSL_WORKARROUND */ + if (!cipher_list) return 0; procs_no=get_max_procs(); for(i = 0; i < procs_no; i++) { - if (SSL_CTX_set_cipher_list(d->ctx[i], d->cipher_list.s) == 0 ) { - ERR("%s: Failure to set SSL context cipher list\n", tls_domain_str(d)); + if (SSL_CTX_set_cipher_list(d->ctx[i], cipher_list) == 0 ) { + ERR("%s: Failure to set SSL context cipher list "%s"\n", + tls_domain_str(d), cipher_list); return -1; } }