132 lines
2.8 KiB
Go
132 lines
2.8 KiB
Go
// +build ignore
|
|
|
|
package main
|
|
|
|
import (
|
|
"bufio"
|
|
"crypto/tls"
|
|
"crypto/x509"
|
|
"fmt"
|
|
"io/ioutil"
|
|
"os"
|
|
"time"
|
|
|
|
"git.sr.ht/~adnano/go-gemini"
|
|
)
|
|
|
|
var (
|
|
scanner = bufio.NewScanner(os.Stdin)
|
|
client = &gemini.Client{}
|
|
)
|
|
|
|
func init() {
|
|
client.KnownHosts.LoadDefault()
|
|
client.TrustCertificate = func(hostname string, cert *x509.Certificate, knownHosts *gemini.KnownHosts) error {
|
|
err := knownHosts.Lookup(hostname, cert)
|
|
if err != nil {
|
|
switch err {
|
|
case gemini.ErrCertificateNotTrusted:
|
|
// Alert the user that the certificate is not trusted
|
|
fmt.Printf("Warning: Certificate for %s is not trusted!\n", hostname)
|
|
fmt.Println("This could indicate a Man-in-the-Middle attack.")
|
|
case gemini.ErrCertificateUnknown:
|
|
// Prompt the user to trust the certificate
|
|
trust := trustCertificate(cert)
|
|
switch trust {
|
|
case trustOnce:
|
|
// Temporarily trust the certificate
|
|
knownHosts.AddTemporary(hostname, cert)
|
|
return nil
|
|
case trustAlways:
|
|
// Add the certificate to the known hosts file
|
|
knownHosts.Add(hostname, cert)
|
|
return nil
|
|
}
|
|
}
|
|
}
|
|
return err
|
|
}
|
|
client.CreateCertificate = func(hostname, path string) (tls.Certificate, error) {
|
|
fmt.Println("Generating client certificate for", hostname, path)
|
|
return gemini.CreateCertificate(gemini.CertificateOptions{
|
|
Duration: time.Hour,
|
|
})
|
|
}
|
|
client.GetInput = func(prompt string, sensitive bool) (string, bool) {
|
|
fmt.Printf("%s: ", prompt)
|
|
scanner.Scan()
|
|
return scanner.Text(), true
|
|
}
|
|
}
|
|
|
|
func doRequest(req *gemini.Request) error {
|
|
resp, err := client.Do(req)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
if resp.Status.Class() == gemini.StatusClassSuccess {
|
|
body, err := ioutil.ReadAll(resp.Body)
|
|
resp.Body.Close()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
fmt.Print(string(body))
|
|
return nil
|
|
}
|
|
return fmt.Errorf("request failed: %d %s: %s", resp.Status, resp.Status.Message(), resp.Meta)
|
|
}
|
|
|
|
type trust int
|
|
|
|
const (
|
|
trustAbort trust = iota
|
|
trustOnce
|
|
trustAlways
|
|
)
|
|
|
|
const trustPrompt = `The certificate offered by this server is of unknown trust. Its fingerprint is:
|
|
%s
|
|
|
|
If you knew the fingerprint to expect in advance, verify that this matches.
|
|
Otherwise, this should be safe to trust.
|
|
|
|
[t]rust always; trust [o]nce; [a]bort
|
|
=> `
|
|
|
|
func trustCertificate(cert *x509.Certificate) trust {
|
|
fmt.Printf(trustPrompt, gemini.Fingerprint(cert))
|
|
scanner.Scan()
|
|
switch scanner.Text() {
|
|
case "t":
|
|
return trustAlways
|
|
case "o":
|
|
return trustOnce
|
|
default:
|
|
return trustAbort
|
|
}
|
|
}
|
|
|
|
func main() {
|
|
if len(os.Args) < 2 {
|
|
fmt.Printf("usage: %s gemini://... [host]", os.Args[0])
|
|
os.Exit(1)
|
|
}
|
|
|
|
url := os.Args[1]
|
|
req, err := gemini.NewRequest(url)
|
|
|
|
if err != nil {
|
|
fmt.Println(err)
|
|
os.Exit(1)
|
|
}
|
|
if len(os.Args) == 3 {
|
|
req.Host = os.Args[2]
|
|
}
|
|
|
|
if err := doRequest(req); err != nil {
|
|
fmt.Println(err)
|
|
os.Exit(1)
|
|
}
|
|
}
|