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Potential buffer overwrite in pem_write_buffer() fixed

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Length indication when given a too small buffer was off.
Added regression test in test_suite_pem to detect this.
This commit is contained in:
Paul Bakker 2014-04-11 13:28:43 +02:00
parent d6ad8e949b
commit 1630058dde
7 changed files with 74 additions and 2 deletions
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2
ChangeLog
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@ -42,6 +42,8 @@ Bugfix
* dhm_parse_dhm() (hence dhm_parse_dhmfile()) did not set dhm->len.
* Calling pk_debug() on an RSA-alt key would segfault.
* pk_get_size() and pk_get_len() were off by a factor 8 for RSA-alt keys.
* Potential buffer overwrite in pem_write_buffer() because of low length
indication (found by Thijs Alkemade)
= PolarSSL 1.3.5 released on 2014-03-26
Features

5
library/pem.c
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@ -382,10 +382,11 @@ int pem_write_buffer( const char *header, const char *footer,
{
int ret;
unsigned char *encode_buf, *c, *p = buf;
size_t len = 0, use_len = 0;
size_t add_len = strlen( header ) + strlen( footer ) + ( use_len / 64 ) + 1;
size_t len = 0, use_len = 0, add_len = 0;
base64_encode( NULL, &use_len, der_data, der_len );
add_len = strlen( header ) + strlen( footer ) + ( use_len / 64 ) + 1;
if( use_len + add_len > buf_len )
{
*olen = use_len + add_len;

1
tests/CMakeLists.txt
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@ -75,6 +75,7 @@ add_test_suite(md)
add_test_suite(mdx)
add_test_suite(mpi)
add_test_suite(pbkdf2)
add_test_suite(pem)
add_test_suite(pkcs1_v21)
add_test_suite(pkcs5)
add_test_suite(pk)

5
tests/Makefile
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@ -58,6 +58,7 @@ APPS = test_suite_aes.ecb test_suite_aes.cbc \
test_suite_hmac_drbg.pr \
test_suite_md test_suite_mdx \
test_suite_mpi test_suite_pbkdf2 \
test_suite_pem \
test_suite_pkcs1_v21 test_suite_pkcs5 \
test_suite_pkparse test_suite_pkwrite \
test_suite_pk \
@ -321,6 +322,10 @@ test_suite_pbkdf2: test_suite_pbkdf2.c $(DEP)
echo " CC $@.c"
$(CC) $(CFLAGS) $(OFLAGS) $@.c $(LDFLAGS) -o $@
test_suite_pem: test_suite_pem.c $(DEP)
echo " CC $@.c"
$(CC) $(CFLAGS) $(OFLAGS) $@.c $(LDFLAGS) -o $@
test_suite_pkcs1_v21: test_suite_pkcs1_v21.c $(DEP)
echo " CC $@.c"
$(CC) $(CFLAGS) $(OFLAGS) $@.c $(LDFLAGS) -o $@

8
tests/suites/main_test.function
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@ -1,6 +1,14 @@
#include <stdio.h>
#include <string.h>
#if defined(POLARSSL_PLATFORM_C)
#include "polarssl/platform.h"
#else
#define polarssl_printf printf
#define polarssl_malloc malloc
#define polarssl_free free
#endif
static int test_errors = 0;
SUITE_PRE_DEP

17
tests/suites/test_suite_pem.data Normal file
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@ -0,0 +1,17 @@
Standard PEM write
pem_write_buffer:"-----START TEST-----\n":"-----END TEST-----\n":"000102030405060708090A0B0C0D0E0F000102030405060708090A0B0C0D0E0F":"-----START TEST-----\nAAECAwQFBgcICQoLDA0ODwABAgMEBQYHCAkKCwwNDg8=\n-----END TEST-----\n"
PEM write (zero data)
pem_write_buffer:"-----START TEST-----\n":"-----END TEST-----\n":"":"-----START TEST-----\n-----END TEST-----\n"
PEM write (one byte)
pem_write_buffer:"-----START TEST-----\n":"-----END TEST-----\n":"00":"-----START TEST-----\nAA==\n-----END TEST-----\n"
PEM write (more than line size)
pem_write_buffer:"-----START TEST-----\n":"-----END TEST-----\n":"000102030405060708090A0B0C0D0E0F000102030405060708090A0B0C0D0E0F000102030405060708090A0B0C0D0E0F000102030405060708090A0B0C0D0E0F000102030405060708090A0B0C0D0E0F":"-----START TEST-----\nAAECAwQFBgcICQoLDA0ODwABAgMEBQYHCAkKCwwNDg8AAQIDBAUGBwgJCgsMDQ4P\nAAECAwQFBgcICQoLDA0ODwABAgMEBQYHCAkKCwwNDg8=\n-----END TEST-----\n"
PEM write (exactly two lines)
pem_write_buffer:"-----START TEST-----\n":"-----END TEST-----\n":"000102030405060708090A0B0C0D0E0F000102030405060708090A0B0C0D0E0F000102030405060708090A0B0C0D0E0F000102030405060708090A0B0C0D0E0F000102030405060708090A0B0C0D0E0F000102030405060708090A0B0C0D0E0F":"-----START TEST-----\nAAECAwQFBgcICQoLDA0ODwABAgMEBQYHCAkKCwwNDg8AAQIDBAUGBwgJCgsMDQ4P\nAAECAwQFBgcICQoLDA0ODwABAgMEBQYHCAkKCwwNDg8AAQIDBAUGBwgJCgsMDQ4P\n-----END TEST-----\n"
PEM write (exactly two lines + 1)
pem_write_buffer:"-----START TEST-----\n":"-----END TEST-----\n":"000102030405060708090A0B0C0D0E0F000102030405060708090A0B0C0D0E0F000102030405060708090A0B0C0D0E0F000102030405060708090A0B0C0D0E0F000102030405060708090A0B0C0D0E0F000102030405060708090A0B0C0D0E0F00":"-----START TEST-----\nAAECAwQFBgcICQoLDA0ODwABAgMEBQYHCAkKCwwNDg8AAQIDBAUGBwgJCgsMDQ4P\nAAECAwQFBgcICQoLDA0ODwABAgMEBQYHCAkKCwwNDg8AAQIDBAUGBwgJCgsMDQ4P\nAA==\n-----END TEST-----\n"

38
tests/suites/test_suite_pem.function Normal file
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@ -0,0 +1,38 @@
/* BEGIN_HEADER */
#include <polarssl/base64.h>
#include <polarssl/pem.h>
/* END_HEADER */
/* BEGIN_DEPENDENCIES
* depends_on:POLARSSL_PEM_WRITE_C
* END_DEPENDENCIES
*/
/* BEGIN_CASE */
void pem_write_buffer( char *start, char *end, char *buf_str, char *result_str )
{
unsigned char buf[5000];
unsigned char *check_buf;
int ret;
size_t buf_len, olen = 0, olen2 = 0;
memset( buf, 0, sizeof( buf ) );
buf_len = unhexify( buf, buf_str );
ret = pem_write_buffer( start, end, buf, buf_len, NULL, 0, &olen );
TEST_ASSERT( ret == POLARSSL_ERR_BASE64_BUFFER_TOO_SMALL );
check_buf = (unsigned char *) polarssl_malloc( olen );
TEST_ASSERT( check_buf != NULL );
memset( check_buf, 0, olen );
ret = pem_write_buffer( start, end, buf, buf_len, check_buf, olen, &olen2 );
TEST_ASSERT( olen2 <= olen );
TEST_ASSERT( olen > strlen( (char*) result_str ) );
TEST_ASSERT( ret == 0 );
TEST_ASSERT( strncmp( (char *) check_buf, (char *) result_str, olen ) == 0 );
polarssl_free( check_buf );
}
/* END_CASE */