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Add flag/option to skip hostName verification #4

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Add flag/option to skip hostName verification #4

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1 change: 1 addition & 0 deletions .gitignore
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Original file line number Diff line number Diff line change
@@ -0,0 +1 @@
certchk
13 changes: 10 additions & 3 deletions certchk.go
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Expand Up @@ -39,18 +39,22 @@ import (

var (
dialer = &net.Dialer{Timeout: 5 * time.Second}
config = &tls.Config{}
file = flag.String("f", "", "read server names from `file`")
skipHostVerify = flag.Bool("skip-host-verify", false, "If set, will ensure that the certificate chain(s) retrieved from the specified hosts are not verified")
)

func check(server string, width int) {
conn, err := tls.DialWithDialer(dialer, "tcp", server+":443", nil)
conn, err := tls.DialWithDialer(dialer, "tcp", server+":443", config)
if err != nil {
fmt.Printf("%*s | %v\n", width, server, err)
return
}
defer conn.Close()
valid := conn.VerifyHostname(server)

var valid error = nil
if !*skipHostVerify {
valid = conn.VerifyHostname(server)
}
for _, c := range conn.ConnectionState().PeerCertificates {
if valid == nil {
fmt.Printf("%*s | valid, expires on %s (%s)\n", width, server,
Expand All @@ -71,6 +75,9 @@ func main() {
os.Exit(1)
}

// Create TLS config based on supplied options
config = &tls.Config{InsecureSkipVerify: *skipHostVerify}

// collect list of server names
names := getNames()

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