162 lines
3.9 KiB
C
162 lines
3.9 KiB
C
/*
|
|
* Dropbear SSH
|
|
*
|
|
* Copyright (c) 2002,2003 Matt Johnston
|
|
* All rights reserved.
|
|
*
|
|
* Permission is hereby granted, free of charge, to any person obtaining a copy
|
|
* of this software and associated documentation files (the "Software"), to deal
|
|
* in the Software without restriction, including without limitation the rights
|
|
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
|
* copies of the Software, and to permit persons to whom the Software is
|
|
* furnished to do so, subject to the following conditions:
|
|
*
|
|
* The above copyright notice and this permission notice shall be included in
|
|
* all copies or substantial portions of the Software.
|
|
*
|
|
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
|
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
|
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
|
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
|
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
|
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
|
|
* SOFTWARE. */
|
|
|
|
#include "includes.h"
|
|
#include "buffer.h"
|
|
#include "dbutil.h"
|
|
#include "session.h"
|
|
#include "ssh.h"
|
|
#include "runopts.h"
|
|
|
|
#ifdef ENABLE_CLI_PASSWORD_AUTH
|
|
|
|
#ifdef ENABLE_CLI_ASKPASS_HELPER
|
|
/* Returns 1 if we want to use the askpass program, 0 otherwise */
|
|
static int want_askpass()
|
|
{
|
|
char* askpass_prog = NULL;
|
|
|
|
askpass_prog = getenv("SSH_ASKPASS");
|
|
return askpass_prog &&
|
|
((!isatty(STDIN_FILENO) && getenv("DISPLAY") )
|
|
|| getenv("SSH_ASKPASS_ALWAYS"));
|
|
}
|
|
|
|
/* returns a statically allocated password from a helper app, or NULL
|
|
* on failure */
|
|
static char *gui_getpass(const char *prompt) {
|
|
|
|
pid_t pid;
|
|
int p[2], maxlen, len, status;
|
|
static char buf[DROPBEAR_MAX_CLI_PASS + 1];
|
|
char* helper = NULL;
|
|
|
|
TRACE(("enter gui_getpass"))
|
|
|
|
helper = getenv("SSH_ASKPASS");
|
|
if (!helper)
|
|
{
|
|
TRACE(("leave gui_getpass: no askpass program"))
|
|
return NULL;
|
|
}
|
|
|
|
if (pipe(p) < 0) {
|
|
TRACE(("error creating child pipe"))
|
|
return NULL;
|
|
}
|
|
|
|
pid = fork();
|
|
|
|
if (pid < 0) {
|
|
TRACE(("fork error"))
|
|
return NULL;
|
|
}
|
|
|
|
if (!pid) {
|
|
/* child */
|
|
close(p[0]);
|
|
if (dup2(p[1], STDOUT_FILENO) < 0) {
|
|
TRACE(("error redirecting stdout"))
|
|
exit(1);
|
|
}
|
|
close(p[1]);
|
|
execlp(helper, helper, prompt, (char *)0);
|
|
TRACE(("execlp error"))
|
|
exit(1);
|
|
}
|
|
|
|
close(p[1]);
|
|
maxlen = sizeof(buf);
|
|
while (maxlen > 0) {
|
|
len = read(p[0], buf + sizeof(buf) - maxlen, maxlen);
|
|
if (len > 0) {
|
|
maxlen -= len;
|
|
} else {
|
|
if (errno != EINTR)
|
|
break;
|
|
}
|
|
}
|
|
|
|
close(p[0]);
|
|
|
|
while (waitpid(pid, &status, 0) < 0 && errno == EINTR)
|
|
;
|
|
if (!WIFEXITED(status) || WEXITSTATUS(status) != 0)
|
|
return(NULL);
|
|
|
|
len = sizeof(buf) - maxlen;
|
|
buf[len] = '\0';
|
|
if (len > 0 && buf[len - 1] == '\n')
|
|
buf[len - 1] = '\0';
|
|
|
|
TRACE(("leave gui_getpass"))
|
|
return(buf);
|
|
}
|
|
#endif /* ENABLE_CLI_ASKPASS_HELPER */
|
|
|
|
void cli_auth_password() {
|
|
|
|
char* password = NULL;
|
|
char prompt[80];
|
|
|
|
TRACE(("enter cli_auth_password"))
|
|
CHECKCLEARTOWRITE();
|
|
|
|
snprintf(prompt, sizeof(prompt), "%s@%s's password: ",
|
|
cli_opts.username, cli_opts.remotehost);
|
|
#ifdef ENABLE_CLI_ASKPASS_HELPER
|
|
if (want_askpass())
|
|
{
|
|
password = gui_getpass(prompt);
|
|
if (!password) {
|
|
dropbear_exit("No password");
|
|
}
|
|
} else
|
|
#endif
|
|
{
|
|
password = getpass_or_cancel(prompt);
|
|
}
|
|
|
|
buf_putbyte(ses.writepayload, SSH_MSG_USERAUTH_REQUEST);
|
|
|
|
buf_putstring(ses.writepayload, cli_opts.username,
|
|
strlen(cli_opts.username));
|
|
|
|
buf_putstring(ses.writepayload, SSH_SERVICE_CONNECTION,
|
|
SSH_SERVICE_CONNECTION_LEN);
|
|
|
|
buf_putstring(ses.writepayload, AUTH_METHOD_PASSWORD,
|
|
AUTH_METHOD_PASSWORD_LEN);
|
|
|
|
buf_putbyte(ses.writepayload, 0); /* FALSE - so says the spec */
|
|
|
|
buf_putstring(ses.writepayload, password, strlen(password));
|
|
|
|
encrypt_packet();
|
|
m_burn(password, strlen(password));
|
|
|
|
TRACE(("leave cli_auth_password"))
|
|
}
|
|
#endif /* ENABLE_CLI_PASSWORD_AUTH */
|