#include "config.h"
#include <sys/types.h>
#include <sys/param.h>
#include <stdio.h>
#ifdef STDC_HEADERS
# include <stdlib.h>
# include <stddef.h>
#else
# ifdef HAVE_STDLIB_H
# include <stdlib.h>
# endif
#endif
#ifdef HAVE_STRING_H
# if defined(HAVE_MEMORY_H) && !defined(STDC_HEADERS)
# include <memory.h>
# endif
# include <string.h>
#else
# ifdef HAVE_STRINGS_H
# include <strings.h>
# endif
#endif
#ifdef HAVE_UNISTD_H
# include <unistd.h>
#endif
#include <pwd.h>
#include <pam/pam_appl.h>
#include "sudo.h"
#include "sudo_auth.h"
#ifndef lint
static const char rcsid[] = "$Sudo: pam.c,v 1.29 2002/01/22 16:43:23 millert Exp $";
#endif
static int sudo_conv __P((int, PAM_CONST struct pam_message **,
struct pam_response **, VOID *));
static char *def_prompt;
#ifndef PAM_DATA_SILENT
#define PAM_DATA_SILENT 0
#endif
int
pam_init(pw, promptp, auth)
struct passwd *pw;
char **promptp;
sudo_auth *auth;
{
static struct pam_conv pam_conv;
pam_handle_t *pamh;
pam_conv.conv = sudo_conv;
if (pam_start("sudo", pw->pw_name, &pam_conv, &pamh) != PAM_SUCCESS) {
log_error(USE_ERRNO|NO_EXIT|NO_MAIL,
"unable to initialize PAM");
return(AUTH_FATAL);
}
if (strcmp(user_tty, "unknown"))
(void) pam_set_item(pamh, PAM_TTY, user_tty);
auth->data = (VOID *) pamh;
return(AUTH_SUCCESS);
}
int
pam_verify(pw, prompt, auth)
struct passwd *pw;
char *prompt;
sudo_auth *auth;
{
int error;
const char *s;
pam_handle_t *pamh = (pam_handle_t *) auth->data;
def_prompt = prompt;
error = pam_authenticate(pamh, PAM_SILENT);
switch (error) {
case PAM_SUCCESS:
return(AUTH_SUCCESS);
case PAM_AUTH_ERR:
case PAM_MAXTRIES:
return(AUTH_FAILURE);
default:
if ((s = pam_strerror(pamh, error)))
log_error(NO_EXIT|NO_MAIL, "pam_authenticate: %s", s);
return(AUTH_FATAL);
}
}
int
pam_cleanup(pw, auth)
struct passwd *pw;
sudo_auth *auth;
{
pam_handle_t *pamh = (pam_handle_t *) auth->data;
int status = PAM_DATA_SILENT;
switch (auth->status) {
case AUTH_SUCCESS:
status |= PAM_SUCCESS;
break;
case AUTH_FAILURE:
status |= PAM_AUTH_ERR;
break;
case AUTH_FATAL:
default:
status |= PAM_ABORT;
break;
}
if (pam_end(pamh, status) == PAM_SUCCESS)
return(AUTH_SUCCESS);
else
return(AUTH_FAILURE);
}
int
pam_prep_user(pw)
struct passwd *pw;
{
struct pam_conv pam_conv;
pam_handle_t *pamh;
pam_conv.conv = sudo_conv;
if (pam_start("sudo", pw->pw_name, &pam_conv, &pamh) != PAM_SUCCESS) {
log_error(USE_ERRNO|NO_EXIT|NO_MAIL,
"unable to initialize PAM");
return(AUTH_FATAL);
}
(void) pam_set_item(pamh, PAM_RUSER, user_name);
if (strcmp(user_tty, "unknown"))
(void) pam_set_item(pamh, PAM_TTY, user_tty);
(void) pam_setcred(pamh, PAM_ESTABLISH_CRED);
if (pam_end(pamh, PAM_SUCCESS) == PAM_SUCCESS)
return(PAM_SUCCESS);
else
return(AUTH_FAILURE);
}
static int
sudo_conv(num_msg, msg, response, appdata_ptr)
int num_msg;
PAM_CONST struct pam_message **msg;
struct pam_response **response;
VOID *appdata_ptr;
{
struct pam_response *pr;
PAM_CONST struct pam_message *pm;
const char *p = def_prompt;
char *pass;
int n;
extern int nil_pw;
if ((*response = malloc(num_msg * sizeof(struct pam_response))) == NULL)
return(PAM_CONV_ERR);
(void) memset(*response, 0, num_msg * sizeof(struct pam_response));
for (pr = *response, pm = *msg, n = num_msg; n--; pr++, pm++) {
switch (pm->msg_style) {
case PAM_PROMPT_ECHO_ON:
tgetpass_flags |= TGP_ECHO;
case PAM_PROMPT_ECHO_OFF:
if (strncmp(pm->msg, "Password:", 9) || (pm->msg[9] != '\0'
&& (pm->msg[9] != ' ' || pm->msg[10] != '\0')))
p = pm->msg;
pass = tgetpass(p, def_ival(I_PASSWD_TIMEOUT) * 60,
tgetpass_flags);
pr->resp = estrdup(pass ? pass : "");
if (*pr->resp == '\0')
nil_pw = 1;
else
memset(pass, 0, strlen(pass));
break;
case PAM_TEXT_INFO:
if (pm->msg)
(void) puts(pm->msg);
break;
case PAM_ERROR_MSG:
if (pm->msg) {
(void) fputs(pm->msg, stderr);
(void) fputc('\n', stderr);
}
break;
default:
for (pr = *response, n = num_msg; n--; pr++) {
if (pr->resp != NULL) {
(void) memset(pr->resp, 0, strlen(pr->resp));
free(pr->resp);
pr->resp = NULL;
}
}
(void) memset(*response, 0,
num_msg * sizeof(struct pam_response));
free(*response);
*response = NULL;
return(PAM_CONV_ERR);
}
}
return(PAM_SUCCESS);
}