#include "includes.h"
#ifdef USE_PAM
-#include "ssh.h"
#include "xmalloc.h"
#include "log.h"
+#include "auth.h"
+#include "auth-options.h"
#include "auth-pam.h"
#include "servconf.h"
#include "canohost.h"
#include "readpass.h"
+extern char *__progname;
+
+extern int use_privsep;
+
RCSID("$Id$");
#define NEW_AUTHTOK_MSG \
- "Warning: Your password has expired, please change it now"
+ "Warning: Your password has expired, please change it now."
+#define NEW_AUTHTOK_MSG_PRIVSEP \
+ "Your password has expired, the session cannot proceed."
static int do_pam_conversation(int num_msg, const struct pam_message **msg,
struct pam_response **resp, void *appdata_ptr);
/* module-local variables */
static struct pam_conv conv = {
- do_pam_conversation,
+ (int (*)())do_pam_conversation,
NULL
};
static char *__pam_msg = NULL;
/* states for do_pam_conversation() */
enum { INITIAL_LOGIN, OTHER } pamstate = INITIAL_LOGIN;
-/* remember whether pam_acct_mgmt() returned PAM_NEWAUTHTOK_REQD */
+/* remember whether pam_acct_mgmt() returned PAM_NEW_AUTHTOK_REQD */
static int password_change_required = 0;
/* remember whether the last pam_authenticate() succeeded or not */
static int was_authenticated = 0;
* messages with into __pam_msg. This is used during initial
* authentication to bypass the normal PAM password prompt.
*
- * OTHER mode handles PAM_PROMPT_ECHO_OFF with read_passphrase(prompt, 1)
+ * OTHER mode handles PAM_PROMPT_ECHO_OFF with read_passphrase()
* and outputs messages to stderr. This mode is used if pam_chauthtok()
* is called to update expired passwords.
*/
char buf[1024];
/* PAM will free this later */
- reply = malloc(num_msg * sizeof(*reply));
- if (reply == NULL)
- return PAM_CONV_ERR;
+ reply = xmalloc(num_msg * sizeof(*reply));
for (count = 0; count < num_msg; count++) {
if (pamstate == INITIAL_LOGIN) {
*/
switch(PAM_MSG_MEMBER(msg, count, msg_style)) {
case PAM_PROMPT_ECHO_ON:
- free(reply);
+ xfree(reply);
return PAM_CONV_ERR;
case PAM_PROMPT_ECHO_OFF:
if (__pampasswd == NULL) {
- free(reply);
+ xfree(reply);
return PAM_CONV_ERR;
}
reply[count].resp = xstrdup(__pampasswd);
break;
case PAM_ERROR_MSG:
case PAM_TEXT_INFO:
- if ((*msg)[count].msg != NULL) {
+ if (PAM_MSG_MEMBER(msg, count, msg) != NULL) {
message_cat(&__pam_msg,
PAM_MSG_MEMBER(msg, count, msg));
}
reply[count].resp_retcode = PAM_SUCCESS;
break;
default:
- free(reply);
+ xfree(reply);
return PAM_CONV_ERR;
}
} else {
reply[count].resp_retcode = PAM_SUCCESS;
break;
case PAM_PROMPT_ECHO_OFF:
- reply[count].resp = xstrdup(
- read_passphrase(PAM_MSG_MEMBER(msg, count,
- msg), 1));
+ reply[count].resp =
+ read_passphrase(PAM_MSG_MEMBER(msg, count,
+ msg), RP_ALLOW_STDIN);
reply[count].resp_retcode = PAM_SUCCESS;
break;
case PAM_ERROR_MSG:
case PAM_TEXT_INFO:
- if ((*msg)[count].msg != NULL)
+ if (PAM_MSG_MEMBER(msg, count, msg) != NULL)
fprintf(stderr, "%s\n",
PAM_MSG_MEMBER(msg, count, msg));
reply[count].resp = xstrdup("");
reply[count].resp_retcode = PAM_SUCCESS;
break;
default:
- free(reply);
+ xfree(reply);
return PAM_CONV_ERR;
}
}
}
/* Attempt password authentation using PAM */
-int auth_pam_password(struct passwd *pw, const char *password)
+int auth_pam_password(Authctxt *authctxt, const char *password)
{
extern ServerOptions options;
int pam_retval;
+ struct passwd *pw = authctxt->pw;
do_pam_set_conv(&conv);
/* deny if no user. */
if (pw == NULL)
return 0;
- if (pw->pw_uid == 0 && options.permit_root_login == 2)
+ if (pw->pw_uid == 0 && options.permit_root_login == PERMIT_NO_PASSWD)
return 0;
if (*password == '\0' && options.permit_empty_passwd == 0)
return 0;
__pampasswd = password;
pamstate = INITIAL_LOGIN;
- pam_retval = do_pam_authenticate(0);
+ pam_retval = do_pam_authenticate(
+ options.permit_empty_passwd == 0 ? PAM_DISALLOW_NULL_AUTHTOK : 0);
if (pam_retval == PAM_SUCCESS) {
debug("PAM Password authentication accepted for "
"user \"%.100s\"", pw->pw_name);
}
pam_retval = pam_acct_mgmt(__pamh, 0);
+ debug2("pam_acct_mgmt() = %d", pam_retval);
switch (pam_retval) {
case PAM_SUCCESS:
/* This is what we want */
break;
+#if 0
case PAM_NEW_AUTHTOK_REQD:
- message_cat(&__pam_msg, NEW_AUTHTOK_MSG);
+ message_cat(&__pam_msg, use_privsep ?
+ NEW_AUTHTOK_MSG_PRIVSEP : NEW_AUTHTOK_MSG);
/* flag that password change is necessary */
password_change_required = 1;
+ /* disallow other functionality for now */
+ no_port_forwarding_flag |= 2;
+ no_agent_forwarding_flag |= 2;
+ no_x11_forwarding_flag |= 2;
break;
+#endif
default:
log("PAM rejected by account configuration[%d]: "
"%.200s", pam_retval, PAM_STRERROR(__pamh,
}
/* Set PAM credentials */
-void do_pam_setcred(void)
+void do_pam_setcred(int init)
{
int pam_retval;
+ if (__pamh == NULL)
+ return;
+
do_pam_set_conv(&conv);
debug("PAM establishing creds");
- pam_retval = pam_setcred(__pamh, PAM_ESTABLISH_CRED);
+ pam_retval = pam_setcred(__pamh,
+ init ? PAM_ESTABLISH_CRED : PAM_REINITIALIZE_CRED);
if (pam_retval != PAM_SUCCESS) {
if (was_authenticated)
fatal("PAM setcred failed[%d]: %.200s",
* Have user change authentication token if pam_acct_mgmt() indicated
* it was expired. This needs to be called after an interactive
* session is established and the user's pty is connected to
- * stdin/stout/stderr.
+ * stdin/stdout/stderr.
*/
void do_pam_chauthtok(void)
{
do_pam_set_conv(&conv);
if (password_change_required) {
+ if (use_privsep)
+ fatal("Password changing is currently unsupported"
+ " with privilege separation");
pamstate = OTHER;
pam_retval = pam_chauthtok(__pamh, PAM_CHANGE_EXPIRED_AUTHTOK);
if (pam_retval != PAM_SUCCESS)
fatal("PAM pam_chauthtok failed[%d]: %.200s",
pam_retval, PAM_STRERROR(__pamh, pam_retval));
+#if 0
+ /* XXX: This would need to be done in the parent process,
+ * but there's currently no way to pass such request. */
+ no_port_forwarding_flag &= ~2;
+ no_agent_forwarding_flag &= ~2;
+ no_x11_forwarding_flag &= ~2;
+ if (!no_port_forwarding_flag && options.allow_tcp_forwarding)
+ channel_permit_all_opens();
+#endif
}
}
{
int pam_retval;
extern ServerOptions options;
+ extern u_int utmp_len;
+ const char *rhost;
debug("Starting up PAM with username \"%.200s\"", user);
fatal("PAM initialisation failed[%d]: %.200s",
pam_retval, PAM_STRERROR(__pamh, pam_retval));
- debug("PAM setting rhost to \"%.200s\"",
- get_canonical_hostname(options.reverse_mapping_check));
- pam_retval = pam_set_item(__pamh, PAM_RHOST,
- get_canonical_hostname(options.reverse_mapping_check));
+ rhost = get_remote_name_or_ip(utmp_len, options.verify_reverse_mapping);
+ debug("PAM setting rhost to \"%.200s\"", rhost);
+
+ pam_retval = pam_set_item(__pamh, PAM_RHOST, rhost);
if (pam_retval != PAM_SUCCESS)
fatal("PAM set rhost failed[%d]: %.200s", pam_retval,
PAM_STRERROR(__pamh, pam_retval));
* not even need one (for tty-less connections)
* Kludge: Set a fake PAM_TTY
*/
- pam_retval = pam_set_item(__pamh, PAM_TTY, "ssh");
+ pam_retval = pam_set_item(__pamh, PAM_TTY, "NODEVssh");
if (pam_retval != PAM_SUCCESS)
fatal("PAM set tty failed[%d]: %.200s",
pam_retval, PAM_STRERROR(__pamh, pam_retval));
fatal_add_cleanup(&do_pam_cleanup_proc, NULL);
}
-/* Return list of PAM enviornment strings */
+/* Return list of PAM environment strings */
char **fetch_pam_environment(void)
{
#ifdef HAVE_PAM_GETENVLIST
#endif /* HAVE_PAM_GETENVLIST */
}
+void free_pam_environment(char **env)
+{
+ int i;
+
+ if (env != NULL) {
+ for (i = 0; env[i] != NULL; i++)
+ xfree(env[i]);
+ }
+}
+
/* Print any messages that have been generated during authentication */
/* or account checking to stderr */
void print_pam_messages(void)
andersk / openssh.git / blobdiff