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CheckForAltNames fixes

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- Missing conversion from char to unsigned char caused any IP
  address with a byte > 127 to be wrong
- IPv6 address was converted to wrong format XX:YY:...
   (which also caused a buffer overrun)
- Anything that is not an IPv4 or IPv6 address should be ignored
This commit is contained in:
Per Allansson
2021-02-26 13:55:33 +01:00
parent 4da7fbb654
commit c41f10e708
2 changed files with 15 additions and 14 deletions
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27
src/internal.c
View File

@ -10168,23 +10168,22 @@ int CheckForAltNames(DecodedCert* dCert, const char* domain, int* checkCN)
#if defined(OPENSSL_ALL) || defined(WOLFSSL_IP_ALT_NAME)
/* check if alt name is stored as IP addr octet */
if (altName->type == ASN_IP_TYPE) {
char tmp[4];
int i;
word32 idx = 0;
for (i = 0; (idx < WOLFSSL_MAX_IPSTR) && (i < altName->len); i++) {
XMEMSET(tmp, 0, sizeof(tmp));
XSNPRINTF(tmp, sizeof(tmp), (altName->len <= 4) ? "%u" : "%02X",
altName->name[i]);
idx += (word32)XSTRLEN(tmp);
XSTRNCAT(name, tmp, (altName->len <= 4) ? 3 : 2);
if ((idx < WOLFSSL_MAX_IPSTR ) && ((i + 1) < altName->len)) {
name[idx++] = (altName->len <= 4) ? '.' : ':';
const unsigned char *ip = (const unsigned char*)altName->name;
if (altName->len == WOLFSSL_IP4_ADDR_LEN) {
XSNPRINTF(name, sizeof(name), "%u.%u.%u.%u", ip[0], ip[1], ip[2], ip[3]);
}
else if (altName->len == WOLFSSL_IP6_ADDR_LEN) {
int i;
for (i = 0; i < 8; i++) {
XSNPRINTF(name + i * 5, sizeof(name) - i * 5, "%02X%02X%s",
ip[2 * i], ip[2 * i + 1], (i < 7) ? ":" : "");
}
}
if (idx >= WOLFSSL_MAX_IPSTR) {
idx = WOLFSSL_MAX_IPSTR -1;
else {
WOLFSSL_MSG("\tnot an IPv4 or IPv6 address");
altName = altName->next;
continue;
}
name[idx] = '\0';
buf = name;
len = (word32)XSTRLEN(name);
}

2
wolfssl/ssl.h
View File

@ -570,6 +570,8 @@ struct WOLFSSL_X509_STORE {
#if defined(OPENSSL_ALL) || defined(OPENSSL_EXTRA) || \
defined(WOLFSSL_WPAS_SMALL) || defined(WOLFSSL_IP_ALT_NAME)
#define WOLFSSL_MAX_IPSTR 46 /* max ip size IPv4 mapped IPv6 */
#define WOLFSSL_IP4_ADDR_LEN 4
#define WOLFSSL_IP6_ADDR_LEN 16
#endif /* OPENSSL_ALL || WOLFSSL_IP_ALT_NAME */
#if defined(OPENSSL_EXTRA) || defined(WOLFSSL_WPAS_SMALL)