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ssl-verify-host: fix verifying ip addresses containing zero's (#732)

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* ssl-verify-host: fix verifying ip addresses containing zero's

If the subject alternate name contained an ip address with an zero
(like 10.42.0.1) it could not successfully verify.
It is because in c++ strings are null-terminated
and therefore strlen(name) would return a wrong result.
As I can not see why we can not trust the length returned by openssl,
lets drop this check.

* ssl-verify-host: add test case

lets try to validate against 127.0.0.1

Co-authored-by: Daniel Ottiger <daniel.ottiger@ch.schindler.com>
This commit is contained in:
Daniel Ottiger 2020-11-03 02:27:34 +01:00 • committed by GitHub
parent eb1d2e04bc
commit 6e1879dfae
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4 changed files with 37 additions and 9 deletions
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16
httplib.h
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@ -6225,17 +6225,15 @@ SSLClient::verify_host_with_subject_alt_name(X509 *server_cert) const {
auto name = (const char *)ASN1_STRING_get0_data(val->d.ia5);
auto name_len = (size_t)ASN1_STRING_length(val->d.ia5);
if (strlen(name) == name_len) {
switch (type) {
case GEN_DNS: dsn_matched = check_host_name(name, name_len); break;
switch (type) {
case GEN_DNS: dsn_matched = check_host_name(name, name_len); break;
case GEN_IPADD:
if (!memcmp(&addr6, name, addr_len) ||
!memcmp(&addr, name, addr_len)) {
ip_mached = true;
}
break;
case GEN_IPADD:
if (!memcmp(&addr6, name, addr_len) ||
!memcmp(&addr, name, addr_len)) {
ip_mached = true;
}
break;
}
}
}