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Get rid of the artification limitation enforced by

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SCTP_AUTH_RANDOM_SIZE_MAX.
This was suggested by Andrew Galante.

MFC after: 3 days
This commit is contained in:
Michael Tuexen 2013-11-07 18:50:11 +00:00
parent a9d94d290b
commit de72f4e54b
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=257804
2 changed files with 12 additions and 31 deletions
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42
sys/netinet/sctp_auth.c
View File

@ -333,10 +333,6 @@ sctp_generate_random_key(uint32_t keylen)
{
sctp_key_t *new_key;
/* validate keylen */
if (keylen > SCTP_AUTH_RANDOM_SIZE_MAX)
keylen = SCTP_AUTH_RANDOM_SIZE_MAX;
new_key = sctp_alloc_key(keylen);
if (new_key == NULL) {
/* out of memory */
@ -374,7 +370,7 @@ sctp_compare_key(sctp_key_t * key1, sctp_key_t * key2)
uint32_t i;
uint32_t key1len, key2len;
uint8_t *key_1, *key_2;
uint8_t temp[SCTP_AUTH_RANDOM_SIZE_MAX];
uint8_t val1, val2;
/* sanity/length check */
key1len = sctp_get_keylen(key1);
@ -386,38 +382,24 @@ sctp_compare_key(sctp_key_t * key1, sctp_key_t * key2)
else if (key2len == 0)
return (1);
if (key1len != key2len) {
if (key1len >= key2len)
maxlen = key1len;
else
maxlen = key2len;
bzero(temp, maxlen);
if (key1len < maxlen) {
/* prepend zeroes to key1 */
bcopy(key1->key, temp + (maxlen - key1len), key1len);
key_1 = temp;
key_2 = key2->key;
} else {
/* prepend zeroes to key2 */
bcopy(key2->key, temp + (maxlen - key2len), key2len);
key_1 = key1->key;
key_2 = temp;
}
if (key1len < key2len) {
maxlen = key2len;
} else {
maxlen = key1len;
key_1 = key1->key;
key_2 = key2->key;
}
key_1 = key1->key;
key_2 = key2->key;
/* check for numeric equality */
for (i = 0; i < maxlen; i++) {
if (*key_1 > *key_2)
/* left-pad with zeros */
val1 = (i < (maxlen - key1len)) ? 0 : *(key_1++);
val2 = (i < (maxlen - key2len)) ? 0 : *(key_2++);
if (val1 > val2) {
return (1);
else if (*key_1 < *key_2)
} else if (val1 < val2) {
return (-1);
key_1++;
key_2++;
}
}
/* keys are equal value, so check lengths */
if (key1len == key2len)
return (0);

1
sys/netinet/sctp_auth.h
View File

@ -46,7 +46,6 @@ __FBSDID("$FreeBSD$");
/* random sizes */
#define SCTP_AUTH_RANDOM_SIZE_DEFAULT 32
#define SCTP_AUTH_RANDOM_SIZE_REQUIRED 32
#define SCTP_AUTH_RANDOM_SIZE_MAX 256
/* union of all supported HMAC algorithm contexts */
typedef union sctp_hash_context {