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examples: add public key auth for specific key

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There was no example of using a specific key for authentication so I added
one.

Signed-off-by: Eric Bentley <ebentley66@gmail.com>
Reviewed-by: Andreas Schneider <asn@cryptomilk.org>
This commit is contained in:
Eric Bentley
2017-11-27 13:08:47 -05:00
committed by Andreas Schneider
parent db67fcbe88
commit 83d86ef6a5
1 changed files with 62 additions and 0 deletions
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62
examples/authentication.c
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@ -100,6 +100,39 @@ int authenticate_kbdint(ssh_session session, const char *password)
return err;
}
static int auth_keyfile(ssh_session session, char* keyfile)
{
ssh_key key = NULL;
char pubkey[132] = {0}; // +".pub"
int rc;
snprintf(pubkey, sizeof(pubkey), "%s.pub", keyfile);
rc = ssh_pki_import_pubkey_file( pubkey, &key);
if (rc != SSH_OK)
return SSH_AUTH_DENIED;
rc = ssh_userauth_try_publickey(session, NULL, key);
ssh_key_free(key);
if (rc!=SSH_AUTH_SUCCESS)
return SSH_AUTH_DENIED;
rc = ssh_pki_import_privkey_file(keyfile, NULL, NULL, NULL, &key);
if (rc != SSH_OK)
return SSH_AUTH_DENIED;
rc = ssh_userauth_publickey(session, NULL, key);
ssh_key_free(key);
return rc;
}
static void error(ssh_session session)
{
fprintf(stderr,"Authentication failed: %s\n",ssh_get_error(session));
@ -140,6 +173,35 @@ int authenticate_console(ssh_session session)
break;
}
}
{
char buffer[128] = {0};
char *p = NULL;
printf("Automatic pubkey failed. "
"Do you want to try a specific key? (y/n)\n");
if (fgets(buffer, sizeof(buffer), stdin) == NULL) {
break;
}
if ((buffer[0]=='Y') || (buffer[0]=='y')) {
printf("private key filename: ");
if (fgets(buffer, sizeof(buffer), stdin) == NULL) {
return SSH_AUTH_ERROR;
}
buffer[sizeof(buffer) - 1] = '\0';
if ((p = strchr(buffer, '\n'))) {
*p = '\0';
}
rc = auth_keyfile(session, buffer);
if(rc == SSH_AUTH_SUCCESS) {
break;
}
fprintf(stderr, "failed with key\n");
}
}
// Try to authenticate with keyboard interactive";
if (method & SSH_AUTH_METHOD_INTERACTIVE) {