base64 decode sanity checks

diff --git a/libraries/liblutil/passwd.c b/libraries/liblutil/passwd.c
index a2235c45f53d0a65934d82831111895394d55882..751852520aedbbe3e2a5b1775282ebc1c21cf2f1 100644 (file)
--- a/libraries/liblutil/passwd.c
+++ b/libraries/liblutil/passwd.c
@@ -486,7 +486,12 @@ static int chk_ssha1(
        unsigned char SHA1digest[LUTIL_SHA1_BYTES];
        int rc;
        unsigned char *orig_pass = NULL;
- 
+
+       /* safety check */
+       if (LUTIL_BASE64_DECODE_LEN(passwd->bv_len) <= sizeof(SHA1digest)) {
+               return -1;
+       }
+
        /* decode base64 password */
        orig_pass = (unsigned char *) ber_memalloc( (size_t) (
                LUTIL_BASE64_DECODE_LEN(passwd->bv_len) + 1) );
@@ -495,7 +500,7 @@ static int chk_ssha1(
 
        rc = lutil_b64_pton(passwd->bv_val, orig_pass, passwd->bv_len);
 
-       if(rc < 0) {
+       if (rc <= sizeof(SHA1digest)) {
                ber_memfree(orig_pass);
                return -1;
        }
@@ -561,6 +566,11 @@ static int chk_smd5(
        int rc;
        unsigned char *orig_pass = NULL;
 
+       /* safety check */
+       if (LUTIL_BASE64_DECODE_LEN(passwd->bv_len) <= sizeof(MD5digest)) {
+               return -1;
+       }
+
        /* base64 un-encode password */
        orig_pass = (unsigned char *) ber_memalloc( (size_t) (
                LUTIL_BASE64_DECODE_LEN(passwd->bv_len) + 1) );
@@ -568,7 +578,8 @@ static int chk_smd5(
        if( orig_pass == NULL ) return -1;
 
        rc = lutil_b64_pton(passwd->bv_val, orig_pass, passwd->bv_len);
-       if ( rc < 0 ) {
+
+       if (rc <= sizeof(MD5digest)) {
                ber_memfree(orig_pass);
                return -1;
        }