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Merge remote-tracking branch 'upstream-public/pr/1094' into development

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This commit is contained in:
Gilles Peskine 2017-11-23 20:02:46 +01:00
commit 68306ed31f
5 changed files with 130 additions and 12 deletions
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10
ChangeLog
View File

@ -2,6 +2,16 @@ mbed TLS ChangeLog (Sorted per branch, date)
= mbed TLS x.x.x branch released xxxx-xx-xx
Security
* Fix a potential heap buffer overflow in mbedtls_ssl_write. When the (by
default enabled) maximum fragment length extension is disabled in the
config and the application data buffer passed to mbedtls_ssl_write
is larger than the internal message buffer (16384 bytes by default), the
latter overflows. The exploitability of this issue depends on whether the
application layer can be forced into sending such large packets. The issue
was independently reported by Tim Nordell via e-mail and by Florin Petriuc
and sjorsdewit on GitHub. Fix proposed by Florin Petriuc in #1022. Fixes #707.
Features
* Allow comments in test data files.

7
library/ssl_tls.c
View File

@ -7078,7 +7078,9 @@ static int ssl_write_real( mbedtls_ssl_context *ssl,
int ret;
#if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH)
size_t max_len = mbedtls_ssl_get_max_frag_len( ssl );
#else
size_t max_len = MBEDTLS_SSL_MAX_CONTENT_LEN;
#endif /* MBEDTLS_SSL_MAX_FRAGMENT_LENGTH */
if( len > max_len )
{
#if defined(MBEDTLS_SSL_PROTO_DTLS)
@ -7093,7 +7095,6 @@ static int ssl_write_real( mbedtls_ssl_context *ssl,
#endif
len = max_len;
}
#endif /* MBEDTLS_SSL_MAX_FRAGMENT_LENGTH */
if( ssl->out_left != 0 )
{
@ -7124,7 +7125,7 @@ static int ssl_write_real( mbedtls_ssl_context *ssl,
*
* With non-blocking I/O, ssl_write_real() may return WANT_WRITE,
* then the caller will call us again with the same arguments, so
* remember wether we already did the split or not.
* remember whether we already did the split or not.
*/
#if defined(MBEDTLS_SSL_CBC_RECORD_SPLITTING)
static int ssl_write_split( mbedtls_ssl_context *ssl,

22
programs/ssl/ssl_client2.c
View File

@ -63,6 +63,9 @@ int main( void )
#include <stdlib.h>
#include <string.h>
#define MAX_REQUEST_SIZE 20000
#define MAX_REQUEST_SIZE_STR "20000"
#define DFL_SERVER_NAME "localhost"
#define DFL_SERVER_ADDR NULL
#define DFL_SERVER_PORT "4433"
@ -243,7 +246,7 @@ int main( void )
" server_port=%%d default: 4433\n" \
" request_page=%%s default: \".\"\n" \
" request_size=%%d default: about 34 (basic request)\n" \
" (minimum: 0, max: 16384)\n" \
" (minimum: 0, max: " MAX_REQUEST_SIZE_STR " )\n" \
" debug_level=%%d default: 0 (disabled)\n" \
" nbio=%%d default: 0 (blocking I/O)\n" \
" options: 1 (non-blocking), 2 (added delays)\n" \
@ -437,7 +440,9 @@ int main( int argc, char *argv[] )
{
int ret = 0, len, tail_len, i, written, frags, retry_left;
mbedtls_net_context server_fd;
unsigned char buf[MBEDTLS_SSL_MAX_CONTENT_LEN + 1];
unsigned char buf[MAX_REQUEST_SIZE + 1];
#if defined(MBEDTLS_KEY_EXCHANGE__SOME__PSK_ENABLED)
unsigned char psk[MBEDTLS_PSK_MAX_LEN];
size_t psk_len = 0;
@ -602,7 +607,8 @@ int main( int argc, char *argv[] )
else if( strcmp( p, "request_size" ) == 0 )
{
opt.request_size = atoi( q );
if( opt.request_size < 0 || opt.request_size > MBEDTLS_SSL_MAX_CONTENT_LEN )
if( opt.request_size < 0 ||
opt.request_size > MAX_REQUEST_SIZE )
goto usage;
}
else if( strcmp( p, "ca_file" ) == 0 )
@ -1494,7 +1500,7 @@ send_request:
mbedtls_printf( " > Write to server:" );
fflush( stdout );
len = mbedtls_snprintf( (char *) buf, sizeof(buf) - 1, GET_REQUEST,
len = mbedtls_snprintf( (char *) buf, sizeof( buf ) - 1, GET_REQUEST,
opt.request_page );
tail_len = (int) strlen( GET_REQUEST_END );
@ -1506,7 +1512,7 @@ send_request:
len += opt.request_size - len - tail_len;
}
strncpy( (char *) buf + len, GET_REQUEST_END, sizeof(buf) - len - 1 );
strncpy( (char *) buf + len, GET_REQUEST_END, sizeof( buf ) - len - 1 );
len += tail_len;
/* Truncate if request size is smaller than the "natural" size */
@ -1550,6 +1556,12 @@ send_request:
frags = 1;
written = ret;
if( written < len )
{
mbedtls_printf( " warning\n ! request didn't fit into single datagram and "
"was truncated to size %u", (unsigned) written );
}
}
buf[written] = '\0';

11
tests/scripts/all.sh
View File

@ -413,6 +413,16 @@ scripts/config.pl unset MBEDTLS_NET_C # getaddrinfo() undeclared, etc.
scripts/config.pl set MBEDTLS_NO_PLATFORM_ENTROPY # uses syscall() on GNU/Linux
CC=gcc CFLAGS='-Werror -Wall -Wextra -O0 -std=c99 -pedantic' make lib
msg "build: default config except MFL extension (ASan build)" # ~ 30s
cleanup
cp "$CONFIG_H" "$CONFIG_BAK"
scripts/config.pl unset MBEDTLS_SSL_MAX_FRAGMENT_LENGTH
CC=gcc cmake -D CMAKE_BUILD_TYPE:String=Asan .
make
msg "test: ssl-opt.sh, MFL-related tests"
tests/ssl-opt.sh -f "Max fragment length"
msg "build: default config with MBEDTLS_TEST_NULL_ENTROPY (ASan build)"
cleanup
cp "$CONFIG_H" "$CONFIG_BAK"
@ -628,4 +638,3 @@ rm -rf "$OUT_OF_SOURCE_DIR"
msg "Done, cleaning up"
cleanup

88
tests/ssl-opt.sh
View File

@ -1348,7 +1348,23 @@ run_test "Session resume using cache: openssl server" \
# Tests for Max Fragment Length extension
run_test "Max fragment length: not used, reference" \
MAX_CONTENT_LEN_EXPECT='16384'
MAX_CONTENT_LEN_CONFIG=$( ../scripts/config.pl get MBEDTLS_SSL_MAX_CONTENT_LEN)
if [ -n "$MAX_CONTENT_LEN_CONFIG" ] && [ "$MAX_CONTENT_LEN_CONFIG" -ne "$MAX_CONTENT_LEN_EXPECT" ]; then
printf "The ${CONFIG_H} file contains a value for the configuration of\n"
printf "MBEDTLS_SSL_MAX_CONTENT_LEN that is different from the script’s\n"
printf "test value of ${MAX_CONTENT_LEN_EXPECT}. \n"
printf "\n"
printf "The tests assume this value and if it changes, the tests in this\n"
printf "script should also be adjusted.\n"
printf "\n"
exit 1
fi
requires_config_enabled MBEDTLS_SSL_MAX_FRAGMENT_LENGTH
run_test "Max fragment length: enabled, default" \
"$P_SRV debug_level=3" \
"$P_CLI debug_level=3" \
0 \
@ -1359,6 +1375,55 @@ run_test "Max fragment length: not used, reference" \
-S "server hello, max_fragment_length extension" \
-C "found max_fragment_length extension"
requires_config_enabled MBEDTLS_SSL_MAX_FRAGMENT_LENGTH
run_test "Max fragment length: enabled, default, larger message" \
"$P_SRV debug_level=3" \
"$P_CLI debug_level=3 request_size=16385" \
0 \
-c "Maximum fragment length is 16384" \
-s "Maximum fragment length is 16384" \
-C "client hello, adding max_fragment_length extension" \
-S "found max fragment length extension" \
-S "server hello, max_fragment_length extension" \
-C "found max_fragment_length extension" \
-c "16385 bytes written in 2 fragments" \
-s "16384 bytes read" \
-s "1 bytes read"
requires_config_enabled MBEDTLS_SSL_MAX_FRAGMENT_LENGTH
run_test "Max fragment length, DTLS: enabled, default, larger message" \
"$P_SRV debug_level=3 dtls=1" \
"$P_CLI debug_level=3 dtls=1 request_size=16385" \
1 \
-c "Maximum fragment length is 16384" \
-s "Maximum fragment length is 16384" \
-C "client hello, adding max_fragment_length extension" \
-S "found max fragment length extension" \
-S "server hello, max_fragment_length extension" \
-C "found max_fragment_length extension" \
-c "fragment larger than.*maximum "
requires_config_disabled MBEDTLS_SSL_MAX_FRAGMENT_LENGTH
run_test "Max fragment length: disabled, larger message" \
"$P_SRV debug_level=3" \
"$P_CLI debug_level=3 request_size=16385" \
0 \
-C "Maximum fragment length is 16384" \
-S "Maximum fragment length is 16384" \
-c "16385 bytes written in 2 fragments" \
-s "16384 bytes read" \
-s "1 bytes read"
requires_config_disabled MBEDTLS_SSL_MAX_FRAGMENT_LENGTH
run_test "Max fragment length DTLS: disabled, larger message" \
"$P_SRV debug_level=3 dtls=1" \
"$P_CLI debug_level=3 dtls=1 request_size=16385" \
1 \
-C "Maximum fragment length is 16384" \
-S "Maximum fragment length is 16384" \
-c "fragment larger than.*maximum "
requires_config_enabled MBEDTLS_SSL_MAX_FRAGMENT_LENGTH
run_test "Max fragment length: used by client" \
"$P_SRV debug_level=3" \
"$P_CLI debug_level=3 max_frag_len=4096" \
@ -1370,6 +1435,7 @@ run_test "Max fragment length: used by client" \
-s "server hello, max_fragment_length extension" \
-c "found max_fragment_length extension"
requires_config_enabled MBEDTLS_SSL_MAX_FRAGMENT_LENGTH
run_test "Max fragment length: used by server" \
"$P_SRV debug_level=3 max_frag_len=4096" \
"$P_CLI debug_level=3" \
@ -1381,6 +1447,7 @@ run_test "Max fragment length: used by server" \
-S "server hello, max_fragment_length extension" \
-C "found max_fragment_length extension"
requires_config_enabled MBEDTLS_SSL_MAX_FRAGMENT_LENGTH
requires_gnutls
run_test "Max fragment length: gnutls server" \
"$G_SRV" \
@ -1390,6 +1457,7 @@ run_test "Max fragment length: gnutls server" \
-c "client hello, adding max_fragment_length extension" \
-c "found max_fragment_length extension"
requires_config_enabled MBEDTLS_SSL_MAX_FRAGMENT_LENGTH
run_test "Max fragment length: client, message just fits" \
"$P_SRV debug_level=3" \
"$P_CLI debug_level=3 max_frag_len=2048 request_size=2048" \
@ -1403,6 +1471,7 @@ run_test "Max fragment length: client, message just fits" \
-c "2048 bytes written in 1 fragments" \
-s "2048 bytes read"
requires_config_enabled MBEDTLS_SSL_MAX_FRAGMENT_LENGTH
run_test "Max fragment length: client, larger message" \
"$P_SRV debug_level=3" \
"$P_CLI debug_level=3 max_frag_len=2048 request_size=2345" \
@ -1417,6 +1486,7 @@ run_test "Max fragment length: client, larger message" \
-s "2048 bytes read" \
-s "297 bytes read"
requires_config_enabled MBEDTLS_SSL_MAX_FRAGMENT_LENGTH
run_test "Max fragment length: DTLS client, larger message" \
"$P_SRV debug_level=3 dtls=1" \
"$P_CLI debug_level=3 dtls=1 max_frag_len=2048 request_size=2345" \
@ -3417,6 +3487,7 @@ run_test "Large packet SSLv3 BlockCipher" \
"$P_CLI request_size=16384 force_version=ssl3 recsplit=0 \
force_ciphersuite=TLS-RSA-WITH-AES-256-CBC-SHA" \
0 \
-c "16384 bytes written in 1 fragments" \
-s "Read from client: 16384 bytes read"
requires_config_enabled MBEDTLS_SSL_PROTO_SSL3
@ -3425,6 +3496,7 @@ run_test "Large packet SSLv3 StreamCipher" \
"$P_CLI request_size=16384 force_version=ssl3 \
force_ciphersuite=TLS-RSA-WITH-RC4-128-SHA" \
0 \
-c "16384 bytes written in 1 fragments" \
-s "Read from client: 16384 bytes read"
run_test "Large packet TLS 1.0 BlockCipher" \
@ -3432,6 +3504,7 @@ run_test "Large packet TLS 1.0 BlockCipher" \
"$P_CLI request_size=16384 force_version=tls1 recsplit=0 \
force_ciphersuite=TLS-RSA-WITH-AES-256-CBC-SHA" \
0 \
-c "16384 bytes written in 1 fragments" \
-s "Read from client: 16384 bytes read"
run_test "Large packet TLS 1.0 BlockCipher truncated MAC" \
@ -3440,6 +3513,7 @@ run_test "Large packet TLS 1.0 BlockCipher truncated MAC" \
force_ciphersuite=TLS-RSA-WITH-AES-256-CBC-SHA \
trunc_hmac=1" \
0 \
-c "16384 bytes written in 1 fragments" \
-s "Read from client: 16384 bytes read"
run_test "Large packet TLS 1.0 StreamCipher truncated MAC" \
@ -3448,6 +3522,7 @@ run_test "Large packet TLS 1.0 StreamCipher truncated MAC" \
force_ciphersuite=TLS-RSA-WITH-RC4-128-SHA \
trunc_hmac=1" \
0 \
-c "16384 bytes written in 1 fragments" \
-s "Read from client: 16384 bytes read"
run_test "Large packet TLS 1.1 BlockCipher" \
@ -3455,6 +3530,7 @@ run_test "Large packet TLS 1.1 BlockCipher" \
"$P_CLI request_size=16384 force_version=tls1_1 \
force_ciphersuite=TLS-RSA-WITH-AES-256-CBC-SHA" \
0 \
-c "16384 bytes written in 1 fragments" \
-s "Read from client: 16384 bytes read"
run_test "Large packet TLS 1.1 StreamCipher" \
@ -3462,6 +3538,7 @@ run_test "Large packet TLS 1.1 StreamCipher" \
"$P_CLI request_size=16384 force_version=tls1_1 \
force_ciphersuite=TLS-RSA-WITH-RC4-128-SHA" \
0 \
-c "16384 bytes written in 1 fragments" \
-s "Read from client: 16384 bytes read"
run_test "Large packet TLS 1.1 BlockCipher truncated MAC" \
@ -3470,6 +3547,7 @@ run_test "Large packet TLS 1.1 BlockCipher truncated MAC" \
force_ciphersuite=TLS-RSA-WITH-AES-256-CBC-SHA \
trunc_hmac=1" \
0 \
-c "16384 bytes written in 1 fragments" \
-s "Read from client: 16384 bytes read"
run_test "Large packet TLS 1.1 StreamCipher truncated MAC" \
@ -3478,6 +3556,7 @@ run_test "Large packet TLS 1.1 StreamCipher truncated MAC" \
force_ciphersuite=TLS-RSA-WITH-RC4-128-SHA \
trunc_hmac=1" \
0 \
-c "16384 bytes written in 1 fragments" \
-s "Read from client: 16384 bytes read"
run_test "Large packet TLS 1.2 BlockCipher" \
@ -3485,6 +3564,7 @@ run_test "Large packet TLS 1.2 BlockCipher" \
"$P_CLI request_size=16384 force_version=tls1_2 \
force_ciphersuite=TLS-RSA-WITH-AES-256-CBC-SHA" \
0 \
-c "16384 bytes written in 1 fragments" \
-s "Read from client: 16384 bytes read"
run_test "Large packet TLS 1.2 BlockCipher larger MAC" \
@ -3492,6 +3572,7 @@ run_test "Large packet TLS 1.2 BlockCipher larger MAC" \
"$P_CLI request_size=16384 force_version=tls1_2 \
force_ciphersuite=TLS-ECDHE-RSA-WITH-AES-256-CBC-SHA384" \
0 \
-c "16384 bytes written in 1 fragments" \
-s "Read from client: 16384 bytes read"
run_test "Large packet TLS 1.2 BlockCipher truncated MAC" \
@ -3500,6 +3581,7 @@ run_test "Large packet TLS 1.2 BlockCipher truncated MAC" \
force_ciphersuite=TLS-RSA-WITH-AES-256-CBC-SHA \
trunc_hmac=1" \
0 \
-c "16384 bytes written in 1 fragments" \
-s "Read from client: 16384 bytes read"
run_test "Large packet TLS 1.2 StreamCipher" \
@ -3507,6 +3589,7 @@ run_test "Large packet TLS 1.2 StreamCipher" \
"$P_CLI request_size=16384 force_version=tls1_2 \
force_ciphersuite=TLS-RSA-WITH-RC4-128-SHA" \
0 \
-c "16384 bytes written in 1 fragments" \
-s "Read from client: 16384 bytes read"
run_test "Large packet TLS 1.2 StreamCipher truncated MAC" \
@ -3515,6 +3598,7 @@ run_test "Large packet TLS 1.2 StreamCipher truncated MAC" \
force_ciphersuite=TLS-RSA-WITH-RC4-128-SHA \
trunc_hmac=1" \
0 \
-c "16384 bytes written in 1 fragments" \
-s "Read from client: 16384 bytes read"
run_test "Large packet TLS 1.2 AEAD" \
@ -3522,6 +3606,7 @@ run_test "Large packet TLS 1.2 AEAD" \
"$P_CLI request_size=16384 force_version=tls1_2 \
force_ciphersuite=TLS-RSA-WITH-AES-256-CCM" \
0 \
-c "16384 bytes written in 1 fragments" \
-s "Read from client: 16384 bytes read"
run_test "Large packet TLS 1.2 AEAD shorter tag" \
@ -3529,6 +3614,7 @@ run_test "Large packet TLS 1.2 AEAD shorter tag" \
"$P_CLI request_size=16384 force_version=tls1_2 \
force_ciphersuite=TLS-RSA-WITH-AES-256-CCM-8" \
0 \
-c "16384 bytes written in 1 fragments" \
-s "Read from client: 16384 bytes read"
# Tests for DTLS HelloVerifyRequest