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- (djm) Clean up PAM namespace. Suggested by Darren Moffat 

<Darren.Moffat@eng.sun.com>
This commit is contained in:
Damien Miller 2001-02-15 11:51:32 +11:00
parent e8b5b04521
commit 646aa60b41
5 changed files with 66 additions and 64 deletions
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4
ChangeLog
View File

@ -1,6 +1,8 @@
20010215
- (djm) Move PAM session setup back to before setuid to user. Fixes
problems on Solaris-derived PAMs.
- (djm) Clean up PAM namespace. Suggested by Darren Moffat
<Darren.Moffat@eng.sun.com>
20010214
- (djm) Don't try to close PAM session or delete credentials if the
@ -3929,4 +3931,4 @@
- Wrote replacements for strlcpy and mkdtemp
- Released 1.0pre1
$Id: ChangeLog,v 1.760 2001/02/15 00:32:15 djm Exp $
$Id: ChangeLog,v 1.761 2001/02/15 00:51:32 djm Exp $

112
auth-pam.c
View File

@ -33,7 +33,7 @@
#include "canohost.h"
#include "readpass.h"
RCSID("$Id: auth-pam.c,v 1.28 2001/02/13 13:43:56 djm Exp $");
RCSID("$Id: auth-pam.c,v 1.29 2001/02/15 00:51:32 djm Exp $");
#define NEW_AUTHTOK_MSG \
"Warning: Your password has expired, please change it now"
@ -46,9 +46,9 @@ static struct pam_conv conv = {
do_pam_conversation,
NULL
};
static char *pam_msg = NULL;
static pam_handle_t *pamh = NULL;
static const char *pampasswd = NULL;
static char *__pam_msg = NULL;
static pam_handle_t *__pamh = NULL;
static const char *__pampasswd = NULL;
/* states for do_pam_conversation() */
enum { INITIAL_LOGIN, OTHER } pamstate = INITIAL_LOGIN;
@ -57,32 +57,32 @@ static int password_change_required = 0;
/* remember whether the last pam_authenticate() succeeded or not */
static int was_authenticated = 0;
/* Remember what has been initialised */
static int session_opened = 0;
static int creds_set = 0;
/* accessor which allows us to switch conversation structs according to
* the authentication method being used */
void pam_set_conv(struct pam_conv *conv)
void do_pam_set_conv(struct pam_conv *conv)
{
pam_set_item(pamh, PAM_CONV, conv);
pam_set_item(__pamh, PAM_CONV, conv);
}
/* start an authentication run */
int do_pam_authenticate(int flags)
{
int retval = pam_authenticate(pamh, flags);
int retval = pam_authenticate(__pamh, flags);
was_authenticated = (retval == PAM_SUCCESS);
return retval;
}
/* Remember what has been initialised */
static int session_opened = 0;
static int creds_set = 0;
/*
* PAM conversation function.
* There are two states this can run in.
*
* INITIAL_LOGIN mode simply feeds the password from the client into
* PAM in response to PAM_PROMPT_ECHO_OFF, and collects output
* messages with into pam_msg. This is used during initial
* 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)
@ -112,17 +112,17 @@ static int do_pam_conversation(int num_msg, const struct pam_message **msg,
free(reply);
return PAM_CONV_ERR;
case PAM_PROMPT_ECHO_OFF:
if (pampasswd == NULL) {
if (__pampasswd == NULL) {
free(reply);
return PAM_CONV_ERR;
}
reply[count].resp = xstrdup(pampasswd);
reply[count].resp = xstrdup(__pampasswd);
reply[count].resp_retcode = PAM_SUCCESS;
break;
case PAM_ERROR_MSG:
case PAM_TEXT_INFO:
if ((*msg)[count].msg != NULL) {
message_cat(&pam_msg,
message_cat(&__pam_msg,
PAM_MSG_MEMBER(msg, count, msg));
}
reply[count].resp = xstrdup("");
@ -170,29 +170,29 @@ static int do_pam_conversation(int num_msg, const struct pam_message **msg,
}
/* Called at exit to cleanly shutdown PAM */
void pam_cleanup_proc(void *context)
void do_pam_cleanup_proc(void *context)
{
int pam_retval;
if (pamh && session_opened) {
pam_retval = pam_close_session(pamh, 0);
if (__pamh && session_opened) {
pam_retval = pam_close_session(__pamh, 0);
if (pam_retval != PAM_SUCCESS)
log("Cannot close PAM session[%d]: %.200s",
pam_retval, PAM_STRERROR(pamh, pam_retval));
pam_retval, PAM_STRERROR(__pamh, pam_retval));
}
if (pamh && creds_set) {
pam_retval = pam_setcred(pamh, PAM_DELETE_CRED);
if (__pamh && creds_set) {
pam_retval = pam_setcred(__pamh, PAM_DELETE_CRED);
if (pam_retval != PAM_SUCCESS)
debug("Cannot delete credentials[%d]: %.200s",
pam_retval, PAM_STRERROR(pamh, pam_retval));
pam_retval, PAM_STRERROR(__pamh, pam_retval));
}
if (pamh) {
pam_retval = pam_end(pamh, pam_retval);
if (__pamh) {
pam_retval = pam_end(__pamh, pam_retval);
if (pam_retval != PAM_SUCCESS)
log("Cannot release PAM authentication[%d]: %.200s",
pam_retval, PAM_STRERROR(pamh, pam_retval));
pam_retval, PAM_STRERROR(__pamh, pam_retval));
}
}
@ -202,7 +202,7 @@ int auth_pam_password(struct passwd *pw, const char *password)
extern ServerOptions options;
int pam_retval;
pam_set_conv(&conv);
do_pam_set_conv(&conv);
/* deny if no user. */
if (pw == NULL)
@ -212,7 +212,7 @@ int auth_pam_password(struct passwd *pw, const char *password)
if (*password == '\0' && options.permit_empty_passwd == 0)
return 0;
pampasswd = password;
__pampasswd = password;
pamstate = INITIAL_LOGIN;
pam_retval = do_pam_authenticate(0);
@ -223,7 +223,7 @@ int auth_pam_password(struct passwd *pw, const char *password)
} else {
debug("PAM Password authentication for \"%.100s\" "
"failed[%d]: %s", pw->pw_name, pam_retval,
PAM_STRERROR(pamh, pam_retval));
PAM_STRERROR(__pamh, pam_retval));
return 0;
}
}
@ -233,29 +233,29 @@ int do_pam_account(char *username, char *remote_user)
{
int pam_retval;
pam_set_conv(&conv);
do_pam_set_conv(&conv);
if (remote_user) {
debug("PAM setting ruser to \"%.200s\"", remote_user);
pam_retval = pam_set_item(pamh, PAM_RUSER, remote_user);
pam_retval = pam_set_item(__pamh, PAM_RUSER, remote_user);
if (pam_retval != PAM_SUCCESS)
fatal("PAM set ruser failed[%d]: %.200s", pam_retval,
PAM_STRERROR(pamh, pam_retval));
PAM_STRERROR(__pamh, pam_retval));
}
pam_retval = pam_acct_mgmt(pamh, 0);
pam_retval = pam_acct_mgmt(__pamh, 0);
switch (pam_retval) {
case PAM_SUCCESS:
/* This is what we want */
break;
case PAM_NEW_AUTHTOK_REQD:
message_cat(&pam_msg, NEW_AUTHTOK_MSG);
message_cat(&__pam_msg, NEW_AUTHTOK_MSG);
/* flag that password change is necessary */
password_change_required = 1;
break;
default:
log("PAM rejected by account configuration[%d]: "
"%.200s", pam_retval, PAM_STRERROR(pamh,
"%.200s", pam_retval, PAM_STRERROR(__pamh,
pam_retval));
return(0);
}
@ -270,16 +270,16 @@ void do_pam_session(char *username, const char *ttyname)
if (ttyname != NULL) {
debug("PAM setting tty to \"%.200s\"", ttyname);
pam_retval = pam_set_item(pamh, PAM_TTY, ttyname);
pam_retval = pam_set_item(__pamh, PAM_TTY, ttyname);
if (pam_retval != PAM_SUCCESS)
fatal("PAM set tty failed[%d]: %.200s",
pam_retval, PAM_STRERROR(pamh, pam_retval));
pam_retval, PAM_STRERROR(__pamh, pam_retval));
}
pam_retval = pam_open_session(pamh, 0);
pam_retval = pam_open_session(__pamh, 0);
if (pam_retval != PAM_SUCCESS)
fatal("PAM session setup failed[%d]: %.200s",
pam_retval, PAM_STRERROR(pamh, pam_retval));
pam_retval, PAM_STRERROR(__pamh, pam_retval));
session_opened = 1;
}
@ -289,20 +289,20 @@ void do_pam_setcred(void)
int pam_retval;
debug("PAM establishing creds");
pam_retval = pam_setcred(pamh, PAM_ESTABLISH_CRED);
pam_retval = pam_setcred(__pamh, PAM_ESTABLISH_CRED);
if (pam_retval != PAM_SUCCESS) {
if (was_authenticated)
fatal("PAM setcred failed[%d]: %.200s",
pam_retval, PAM_STRERROR(pamh, pam_retval));
pam_retval, PAM_STRERROR(__pamh, pam_retval));
else
debug("PAM setcred failed[%d]: %.200s",
pam_retval, PAM_STRERROR(pamh, pam_retval));
pam_retval, PAM_STRERROR(__pamh, pam_retval));
} else
creds_set = 1;
}
/* accessor function for file scope static variable */
int pam_password_change_required(void)
int is_pam_password_change_required(void)
{
return password_change_required;
}
@ -321,11 +321,11 @@ void do_pam_chauthtok(void)
pamstate = OTHER;
/* XXX: should we really loop forever? */
do {
pam_retval = pam_chauthtok(pamh,
pam_retval = pam_chauthtok(__pamh,
PAM_CHANGE_EXPIRED_AUTHTOK);
if (pam_retval != PAM_SUCCESS)
log("PAM pam_chauthtok failed[%d]: %.200s",
pam_retval, PAM_STRERROR(pamh, pam_retval));
pam_retval, PAM_STRERROR(__pamh, pam_retval));
} while (pam_retval != PAM_SUCCESS);
}
}
@ -333,8 +333,8 @@ void do_pam_chauthtok(void)
/* Cleanly shutdown PAM */
void finish_pam(void)
{
pam_cleanup_proc(NULL);
fatal_remove_cleanup(&pam_cleanup_proc, NULL);
do_pam_cleanup_proc(NULL);
fatal_remove_cleanup(&do_pam_cleanup_proc, NULL);
}
/* Start PAM authentication for specified account */
@ -345,19 +345,19 @@ void start_pam(const char *user)
debug("Starting up PAM with username \"%.200s\"", user);
pam_retval = pam_start(SSHD_PAM_SERVICE, user, &conv, &pamh);
pam_retval = pam_start(SSHD_PAM_SERVICE, user, &conv, &__pamh);
if (pam_retval != PAM_SUCCESS)
fatal("PAM initialisation failed[%d]: %.200s",
pam_retval, PAM_STRERROR(pamh, pam_retval));
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,
pam_retval = pam_set_item(__pamh, PAM_RHOST,
get_canonical_hostname(options.reverse_mapping_check));
if (pam_retval != PAM_SUCCESS)
fatal("PAM set rhost failed[%d]: %.200s", pam_retval,
PAM_STRERROR(pamh, pam_retval));
PAM_STRERROR(__pamh, pam_retval));
#ifdef PAM_TTY_KLUDGE
/*
* Some PAM modules (e.g. pam_time) require a TTY to operate,
@ -366,20 +366,20 @@ void start_pam(const char *user)
* 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, "ssh");
if (pam_retval != PAM_SUCCESS)
fatal("PAM set tty failed[%d]: %.200s",
pam_retval, PAM_STRERROR(pamh, pam_retval));
pam_retval, PAM_STRERROR(__pamh, pam_retval));
#endif /* PAM_TTY_KLUDGE */
fatal_add_cleanup(&pam_cleanup_proc, NULL);
fatal_add_cleanup(&do_pam_cleanup_proc, NULL);
}
/* Return list of PAM enviornment strings */
char **fetch_pam_environment(void)
{
#ifdef HAVE_PAM_GETENVLIST
return(pam_getenvlist(pamh));
return(pam_getenvlist(__pamh));
#else /* HAVE_PAM_GETENVLIST */
return(NULL);
#endif /* HAVE_PAM_GETENVLIST */
@ -389,8 +389,8 @@ char **fetch_pam_environment(void)
/* or account checking to stderr */
void print_pam_messages(void)
{
if (pam_msg != NULL)
fputs(pam_msg, stderr);
if (__pam_msg != NULL)
fputs(__pam_msg, stderr);
}
/* Append a message to buffer */

6
auth-pam.h
View File

@ -1,4 +1,4 @@
/* $Id: auth-pam.h,v 1.9 2001/02/09 01:55:36 djm Exp $ */
/* $Id: auth-pam.h,v 1.10 2001/02/15 00:51:32 djm Exp $ */
#include "includes.h"
#ifdef USE_PAM
@ -14,9 +14,9 @@ int do_pam_account(char *username, char *remote_user);
void do_pam_session(char *username, const char *ttyname);
void do_pam_setcred(void);
void print_pam_messages(void);
int pam_password_change_required(void);
int is_pam_password_change_required(void);
void do_pam_chauthtok(void);
void pam_set_conv(struct pam_conv *);
void do_pam_set_conv(struct pam_conv *);
void message_cat(char **p, const char *a);
#endif /* USE_PAM */

4
auth2-pam.c
View File

@ -1,5 +1,5 @@
#include "includes.h"
RCSID("$Id: auth2-pam.c,v 1.8 2001/02/07 01:58:33 djm Exp $");
RCSID("$Id: auth2-pam.c,v 1.9 2001/02/15 00:51:32 djm Exp $");
#ifdef USE_PAM
#include <security/pam_appl.h>
@ -38,7 +38,7 @@ auth2_pam(Authctxt *authctxt)
fatal("auth2_pam: internal error: no user");
conv2.appdata_ptr = authctxt;
pam_set_conv(&conv2);
do_pam_set_conv(&conv2);
dispatch_set(SSH2_MSG_USERAUTH_INFO_RESPONSE,
&input_userauth_info_response_pam);

4
session.c
View File

@ -719,7 +719,7 @@ do_login(Session *s, const char *command)
* If password change is needed, do it now.
* This needs to occur before the ~/.hushlogin check.
*/
if (pam_password_change_required()) {
if (is_pam_password_change_required()) {
print_pam_messages();
do_pam_chauthtok();
}
@ -737,7 +737,7 @@ do_login(Session *s, const char *command)
return;
#ifdef USE_PAM
if (!pam_password_change_required())
if (!is_pam_password_change_required())
print_pam_messages();
#endif /* USE_PAM */
#ifdef WITH_AIXAUTHENTICATE