welterde/l2tpns
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

Quick fix to at least decode slightly larger hidden AVPs correctly

Browse source
This commit is contained in:
Tassilo Schweyer 2025-05-05 03:15:52 +02:00
parent 690e09ba57
commit 702ed1ec72
1 changed files with 5 additions and 1 deletions
Download patch file Download diff file Expand all files Collapse all files

6
l2tpns.c
View file

@ -8620,6 +8620,10 @@ static void unhide_value(uint8_t *value, size_t len, uint16_t type, uint8_t *vec
size_t d = 0; size_t d = 0;
uint16_t m = htons(type); uint16_t m = htons(type);
// remember first block
uint8_t firstcipher[16];
memcpy(firstcipher, value, 16);
// Compute initial pad // Compute initial pad
MD5_Init(&ctx); MD5_Init(&ctx);
MD5_Update(&ctx, (unsigned char *) &m, 2); MD5_Update(&ctx, (unsigned char *) &m, 2);
@ -8637,7 +8641,7 @@ static void unhide_value(uint8_t *value, size_t len, uint16_t type, uint8_t *vec
{ {
MD5_Init(&ctx); MD5_Init(&ctx);
MD5_Update(&ctx, config->l2tp_secret, strlen(config->l2tp_secret)); MD5_Update(&ctx, config->l2tp_secret, strlen(config->l2tp_secret));
MD5_Update(&ctx, last, sizeof(digest)); MD5_Update(&ctx, firstcipher, sizeof(digest));
MD5_Final(digest, &ctx); MD5_Final(digest, &ctx);
d = 0; d = 0;