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Fix hostname validation with an IPv4 SAN

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Go can use 16 bytes to store an IPv4 address in a net.IP so it needs to
be converted to a 4-byte representation first.
This commit is contained in:
Andrew Harding 2018-04-17 08:51:22 -06:00
parent 2df7e68102
commit 85c7f475b6
1 changed files with 6 additions and 0 deletions
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6
hostname.go
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@ -95,6 +95,12 @@ func (c *Certificate) CheckEmail(email string, flags CheckFlags) error {
// Specifically returns ValidationError if the Certificate didn't match but
// there was no internal error.
func (c *Certificate) CheckIP(ip net.IP, flags CheckFlags) error {
// X509_check_ip will fail to validate the 16-byte representation of an IPv4
// address, so convert to the 4-byte representation.
if ip4 := ip.To4(); ip4 != nil {
ip = ip4
}
cip := unsafe.Pointer(&ip[0])
rv := C.X509_check_ip(c.x, (*C.uchar)(cip), C.size_t(len(ip)),
C.uint(flags))