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Prefer SHA-1 certificates for pre-1.2 clients

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This commit is contained in:
Manuel Pégourié-Gonnard 2015-01-08 16:43:07 +01:00
parent 6458e3b743
commit df331a55d2
3 changed files with 86 additions and 5 deletions
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6
ChangeLog
View file

@ -1,5 +1,11 @@
PolarSSL ChangeLog (Sorted per branch, date)
= PolarSSL 1.3.10 released ???
Features
* Certificate selection based on signature hash, prefering SHA-1 over SHA-2
for pre-1.2 clients when multiple certificates are available.
= PolarSSL 1.3.9 released 2014-10-20
Security
* Lowest common hash was selected from signature_algorithms extension in

31
library/ssl_srv.c
View file

@ -776,7 +776,7 @@ static int ssl_check_key_curve( pk_context *pk,
static int ssl_pick_cert( ssl_context *ssl,
const ssl_ciphersuite_t * ciphersuite_info )
{
ssl_key_cert *cur, *list;
ssl_key_cert *cur, *list, *fallback = NULL;
pk_type_t pk_alg = ssl_get_ciphersuite_sig_pk_alg( ciphersuite_info );
#if defined(POLARSSL_SSL_SERVER_NAME_INDICATION)
@ -814,15 +814,36 @@ static int ssl_pick_cert( ssl_context *ssl,
continue;
#endif
/*
* Try to select a SHA-1 certificate for pre-1.2 clients, but still
* present them a SHA-higher cert rather than failing if it's the only
* one we got that satisfies the other conditions.
*/
if( ssl->minor_ver < SSL_MINOR_VERSION_3 &&
cur->cert->sig_md != POLARSSL_MD_SHA1 )
{
if( fallback == NULL )
fallback = cur;
continue;
}
/* If we get there, we got a winner */
break;
}
if( cur == NULL )
return( -1 );
if( cur != NULL )
{
ssl->handshake->key_cert = cur;
return( 0 );
}
ssl->handshake->key_cert = cur;
return( 0 );
if( fallback != NULL )
{
ssl->handshake->key_cert = fallback;
return( 0 );
}
return( -1 );
}
#endif /* POLARSSL_X509_CRT_PARSE_C */

54
tests/ssl-opt.sh
View file

@ -956,6 +956,60 @@ run_test "Authentication: client no cert, ssl3" \
-C "! ssl_handshake returned" \
-S "X509 - Certificate verification failed"
# Tests for certificate selection based on SHA verson
run_test "Certificate hash: client TLS 1.2 -> SHA-2" \
"$P_SRV crt_file=data_files/server5.crt \
key_file=data_files/server5.key \
crt_file2=data_files/server5-sha1.crt \
key_file2=data_files/server5.key" \
"$P_CLI force_version=tls1_2" \
0 \
-c "signed using.*ECDSA with SHA256" \
-C "signed using.*ECDSA with SHA1"
run_test "Certificate hash: client TLS 1.1 -> SHA-1" \
"$P_SRV crt_file=data_files/server5.crt \
key_file=data_files/server5.key \
crt_file2=data_files/server5-sha1.crt \
key_file2=data_files/server5.key" \
"$P_CLI force_version=tls1_1" \
0 \
-C "signed using.*ECDSA with SHA256" \
-c "signed using.*ECDSA with SHA1"
run_test "Certificate hash: client TLS 1.0 -> SHA-1" \
"$P_SRV crt_file=data_files/server5.crt \
key_file=data_files/server5.key \
crt_file2=data_files/server5-sha1.crt \
key_file2=data_files/server5.key" \
"$P_CLI force_version=tls1" \
0 \
-C "signed using.*ECDSA with SHA256" \
-c "signed using.*ECDSA with SHA1"
run_test "Certificate hash: client TLS 1.1, no SHA-1 -> SHA-2 (order 1)" \
"$P_SRV crt_file=data_files/server5.crt \
key_file=data_files/server5.key \
crt_file2=data_files/server6.crt \
key_file2=data_files/server6.key" \
"$P_CLI force_version=tls1_1" \
0 \
-c "serial number.*09" \
-c "signed using.*ECDSA with SHA256" \
-C "signed using.*ECDSA with SHA1"
run_test "Certificate hash: client TLS 1.1, no SHA-1 -> SHA-2 (order 2)" \
"$P_SRV crt_file=data_files/server6.crt \
key_file=data_files/server6.key \
crt_file2=data_files/server5.crt \
key_file2=data_files/server5.key" \
"$P_CLI force_version=tls1_1" \
0 \
-c "serial number.*0A" \
-c "signed using.*ECDSA with SHA256" \
-C "signed using.*ECDSA with SHA1"
# tests for SNI
run_test "SNI: no SNI callback" \