[OpenAFS-devel] [PATCH] PAM: allow PAM to change AFS passwords
Ulrich Hahn
zrsha01@zdv.uni-tuebingen.de
Wed, 28 Feb 2001 12:58:12 +0100 (CET)
This patch allows AFS users to change their passwords using the=20
standard passwd utility (no kpasswd needed). To enable PAM to change
the AFS password the PAM definition to passwd needs the following lines
included:
auth sufficient /lib/security/pam_afs.so try_first_path ignore_root
password sufficient /lib/security/pam_afs.so try_first_path ignore_root
The patch was tested on openafs-1.0.2, linux kernel 2.2.16, SuSE 7.0.
patch=20
Uli
: Ulrich Hahn email: ulrich.hahn@zdv.uni-tuebingen.de :
: Zentrum f=FCr Datenverarbeitung Tel: + (49) 07071 29 70315 :
: Universit=E4t T=FCbingen FAX: + (49) 07071 29 5912 :=
=20
-----------------------------------------------------------------------
##### patch
--- openafs-1.0.2.orig/src/pam/afs_password.c=09Wed Feb 21 11:10:29 2001
+++ openafs-1.0.2/src/pam/afs_password.c=09Wed Feb 28 12:24:55 2001
@@ -9,6 +9,22 @@
=20
#include <security/pam_appl.h>
#include <security/pam_modules.h>
+#include <syslog.h>
+#include <stdlib.h>
+#include <string.h>
+#include <pwd.h>
+#include <unistd.h>
+#include <afs/param.h>
+#include <sys/param.h>
+#include <afs/kautils.h>
+#include "afs_message.h"
+#include "afs_util.h"
+#include "afs_pam_msg.h"
+#include <signal.h>
+#include <sys/wait.h>
+#include <errno.h>
+
+#define RET(x) { retcode =3D (x); goto out; }
=20
extern int
pam_sm_chauthtok(
@@ -17,5 +33,267 @@
=09int=09=09argc,
=09const char=09**argv)
{
- return PAM_PERM_DENIED;
+ int retcode =3D PAM_SUCCESS;
+ int errcode =3D PAM_SUCCESS;
+ int code;
+ int origmask;
+ int logmask =3D LOG_UPTO(LOG_INFO);
+ int nowarn =3D 0;
+ int use_first_pass =3D 0;
+ int try_first_pass =3D 0;
+ int ignore_root =3D 0;
+ int got_authtok =3D 0;=09/* got PAM_AUTHTOK upon entry */
+ int torch_password =3D 1;
+ int i;
+ char my_password_buf[256];
+ char instance[256];
+ char realm[256];
+ char cell[256];
+ char *localcell;
+ char *user =3D NULL, *password =3D NULL;
+ char *new_password =3D NULL, *verify_password =3D NULL;
+ char upwd_buf[2048];=09/* size is a guess. */
+ char*=09reason =3D NULL;
+ struct ktc_encryptionKey oldkey, newkey;
+ struct ktc_token token;
+ struct ubik_client *conn =3D 0;
+ struct pam_conv *pam_convp =3D NULL;
+ struct passwd unix_pwd, *upwd =3D NULL;
+
+#ifndef AFS_SUN56_ENV
+ openlog(pam_afs_ident, LOG_CONS, LOG_AUTH);
+#endif
+ origmask =3D setlogmask(logmask);
+
+ /*
+ * Parse the user options. Log an error for any unknown options.
+ *
+ * Todo options: PAM_SILENT
+ */
+ for (i =3D 0; i < argc; i++) {
+=09if (=09 strcasecmp(argv[i], "debug"=09 ) =3D=3D 0) {
+=09 logmask |=3D LOG_MASK(LOG_DEBUG);
+=09 (void) setlogmask(logmask);
+=09} else if (strcasecmp(argv[i], "nowarn"=09 ) =3D=3D 0) {
+=09 nowarn =3D 1;
+=09} else if (strcasecmp(argv[i], "use_first_pass") =3D=3D 0) {
+=09 use_first_pass =3D 1;
+=09} else if (strcasecmp(argv[i], "try_first_pass") =3D=3D 0) {
+=09 try_first_pass =3D 1;
+=09} else if (strcasecmp(argv[i], "ignore_root" ) =3D=3D 0) {
+=09 ignore_root =3D 1;
+=09} else {
+=09 pam_afs_syslog(LOG_ERR, PAMAFS_UNKNOWNOPT, argv[i]);
+=09}
+ }
+
+ if (use_first_pass) try_first_pass =3D 0;
+
+ pam_afs_syslog(LOG_DEBUG, PAMAFS_OPTIONS, nowarn, use_first_pass, try_=
first_pass);
+ pam_afs_syslog(LOG_DEBUG, PAMAFS_PAMERROR, flags);
+
+ /* Try to get the user-interaction info, if available. */
+ errcode =3D pam_get_item(pamh, PAM_CONV, (const void **) &pam_convp);
+ if (errcode !=3D PAM_SUCCESS) {
+=09pam_afs_syslog(LOG_WARNING, PAMAFS_NO_USER_INT);
+=09pam_convp =3D NULL;
+ }
+
+ /* Who are we trying to authenticate here? */
+ if ((errcode =3D pam_get_user(pamh, (const char **)&user, "AFS usernam=
e: ")) !=3D PAM_SUCCESS) {
+=09pam_afs_syslog(LOG_ERR, PAMAFS_NOUSER, errcode);
+=09RET(PAM_USER_UNKNOWN);
+ }
+
+ pam_afs_syslog(LOG_DEBUG, PAMAFS_USERNAMEDEBUG, user);
+
+ /*
+ * If the user has a "local" (or via nss, possibly nss_dce) pwent,
+ * and its uid=3D=3D0, and "ignore_root" was given in pam.conf,
+ * ignore the user.
+ */
+#if=09defined(AFS_HPUX_ENV)
+#if defined(AFS_HPUX110_ENV)
+ i =3D getpwnam_r(user, &unix_pwd, upwd_buf, sizeof(upwd_buf), &upwd);
+#else /* AFS_HPUX110_ENV */
+ i =3D getpwnam_r(user, &unix_pwd, upwd_buf, sizeof(upwd_buf));
+ if ( i =3D=3D 0 )=09=09=09/* getpwnam_r success */
+=09upwd =3D &unix_pwd;=20
+#endif /* else AFS_HPUX110_ENV */
+ if (ignore_root && i =3D=3D 0 && upwd->pw_uid =3D=3D 0) {
+=09pam_afs_syslog(LOG_INFO, PAMAFS_IGNORINGROOT, user);
+=09RET(PAM_AUTH_ERR);
+ }
+#else
+#ifdef AFS_LINUX20_ENV
+ upwd =3D getpwnam(user);
+#else
+ upwd =3D getpwnam_r(user, &unix_pwd, upwd_buf, sizeof(upwd_buf));
+#endif
+ if (ignore_root && upwd !=3D NULL && upwd->pw_uid =3D=3D 0) {
+=09pam_afs_syslog(LOG_INFO, PAMAFS_IGNORINGROOT, user);
+=09RET(PAM_AUTH_ERR);
+ }
+#endif
+
+ errcode =3D pam_get_item(pamh, PAM_AUTHTOK, (const void **) &password)=
;
+ if (errcode !=3D PAM_SUCCESS || password =3D=3D NULL) {
+=09if (use_first_pass) {
+=09 pam_afs_syslog(LOG_ERR, PAMAFS_PASSWD_REQ, user);
+=09 RET(PAM_AUTH_ERR);
+=09}
+=09password =3D NULL;=09/* In case it isn't already NULL */
+=09pam_afs_syslog(LOG_DEBUG, PAMAFS_NOFIRSTPASS, user);
+ } else if (password[0] =3D=3D '\0') {
+=09/* Actually we *did* get one but it was empty. */
+=09torch_password =3D 0;
+=09pam_afs_syslog(LOG_INFO, PAMAFS_NILPASSWORD, user);
+=09RET(PAM_NEW_AUTHTOK_REQD);
+ } else {
+=09pam_afs_syslog(LOG_DEBUG, PAMAFS_GOTPASS, user);
+=09torch_password =3D 0;
+=09got_authtok =3D 1;
+ }
+ if (!(use_first_pass || try_first_pass)) {
+=09password =3D NULL;
+ }
+
+ if (password =3D=3D NULL) {
+=09torch_password =3D 1;
+=09if (use_first_pass)
+=09 RET(PAM_AUTH_ERR);=09/* shouldn't happen */
+=09if (try_first_pass)
+=09 try_first_pass =3D 0;=09
+=09if (pam_convp =3D=3D NULL || pam_convp->conv =3D=3D NULL) {
+=09 pam_afs_syslog(LOG_ERR, PAMAFS_CANNOT_PROMPT);
+=09 RET(PAM_AUTH_ERR);
+=09}
+
+=09errcode =3D pam_afs_prompt(pam_convp, &password, 0, PAMAFS_PWD_PROMPT);
+=09if (errcode !=3D PAM_SUCCESS || password =3D=3D NULL) {
+=09 pam_afs_syslog(LOG_ERR, PAMAFS_GETPASS_FAILED);
+=09 RET(PAM_AUTH_ERR);
+=09}
+=09if (password[0] =3D=3D '\0') {
+=09 pam_afs_syslog(LOG_INFO, PAMAFS_NILPASSWORD, user);
+=09 RET(PAM_NEW_AUTHTOK_REQD);
+=09}
+
+=09/*
+ * We aren't going to free the password later (we will wipe it,
+ * though), because the storage for it if we get it from other
+ * paths may belong to someone else. Since we do need to free
+ * this storage, copy it to a buffer that won't need to be freed
+ * later, and free this storage now.
+ */
+ strncpy(my_password_buf, password, sizeof(my_password_buf));
+ my_password_buf[sizeof(my_password_buf)-1] =3D '\0';
+ memset(password, 0, strlen(password));
+ free(password);
+ password =3D my_password_buf;
+ }
+
+ if ( (code =3D ka_VerifyUserPassword(KA_USERAUTH_VERSION + KA_USERAUTH=
_DOSETPAG,
+=09=09=09=09 user, /* kerberos name */
+=09=09=09=09 (char *)0, /* instance */
+=09=09=09=09 (char *)0, /* realm */
+=09=09=09=09 password, /* password */
+=09=09=09=09 0, /* spare 2 */
+=09=09=09=09 &reason /* error string */ )) !=3D0 ) {
+=09pam_afs_syslog(LOG_ERR, PAMAFS_LOGIN_FAILED, user, reason);
+ RET(PAM_AUTH_ERR);
+ }
+ torch_password =3D 0;
+ pam_set_item(pamh, PAM_AUTHTOK, password);
+ pam_set_item(pamh, PAM_OLDAUTHTOK, password);
+ if (flags & PAM_PRELIM_CHECK) {
+ /* only auth check was requested, so return success here */
+ return(PAM_SUCCESS);
+ }
+ if (!(flags & PAM_UPDATE_AUTHTOK)) {
+ /* these lines are never executed ... */
+ /* UPDATE_AUTHTOK flag is required, return with error */
+ pam_afs_syslog(LOG_ERR, PAMAFS_FLAGS, "PAM_UPDATE_AUTHTOK");
+ RET(PAM_AUTH_ERR);
+ }
+
+ /* get the new passwd and verify it */
+ errcode =3D pam_afs_prompt(pam_convp, &new_password, 0, PAMAFS_NEW_PWD=
_PROMPT);
+ if (errcode !=3D PAM_SUCCESS || new_password =3D=3D NULL) {
+ pam_afs_syslog(LOG_ERR, PAMAFS_GETPASS_FAILED);
+ RET(PAM_AUTH_ERR);
+ }
+ if (new_password[0] =3D=3D '\0') {
+ pam_afs_syslog(LOG_INFO, PAMAFS_NILPASSWORD, user);
+ RET(PAM_AUTH_ERR);
+ }
+ errcode =3D pam_afs_prompt(pam_convp, &verify_password, 0, PAMAFS_VERI=
FY_PWD_PROMPT);
+ if (errcode !=3D PAM_SUCCESS || verify_password =3D=3D NULL) {
+ pam_afs_syslog(LOG_ERR, PAMAFS_GETPASS_FAILED);
+=09memset(new_password, 0, strlen(new_password));
+ RET(PAM_AUTH_ERR);
+ }
+ if (verify_password[0] =3D=3D '\0') {
+ pam_afs_syslog(LOG_INFO, PAMAFS_NILPASSWORD, user);
+=09memset(new_password, 0, strlen(new_password));
+ RET(PAM_AUTH_ERR);
+ }
+ if (strcmp(new_password, verify_password) !=3D 0) {
+ pam_afs_syslog(LOG_INFO, PAMAFS_NE_PASSWORD);
+=09memset(new_password, 0, strlen(new_password));
+=09memset(verify_password, 0, strlen(verify_password));
+ RET(PAM_AUTH_ERR);
+ }
+ memset(verify_password, 0, strlen(verify_password));
+ /* checking password length and quality is up to other PAM modules */=
=20
+
+ /* set the new password */
+ if ((code =3D ka_Init(0)) !=3D 0) {
+ pam_afs_syslog(LOG_ERR, PAMAFS_KAERROR, code);
+ RET(PAM_AUTH_ERR);
+ }
+ if ((code =3D rx_Init(0)) !=3D 0) {
+ pam_afs_syslog(LOG_ERR, PAMAFS_KAERROR, code);
+ RET(PAM_AUTH_ERR);
+ }
+ strcpy(instance,"");
+ if ((localcell =3D ka_LocalCell()) =3D=3D NULL) {
+ pam_afs_syslog(LOG_ERR, PAMAFS_NOCELLNAME);
+ RET(PAM_AUTH_ERR);
+ }
+ strcpy(realm,localcell);
+ strcpy(cell,realm);
+ /* oldkey is not used in ka_ChangePassword (only for ka_auth) */
+ ka_StringToKey(password, realm, &oldkey);
+ ka_StringToKey(new_password, realm, &newkey);
+ if ((code =3D ka_GetAdminToken(user, instance, realm, &oldkey, 20, &to=
ken, 0)) !=3D 0) {
+ pam_afs_syslog(LOG_ERR, PAMAFS_KAERROR, code);
+ RET(PAM_AUTH_ERR);
+ }
+ if ((code =3D ka_AuthServerConn(realm, KA_MAINTENANCE_SERVICE, &token,=
&conn)) !=3D 0) {=20
+ pam_afs_syslog(LOG_ERR, PAMAFS_KAERROR, code);
+ RET(PAM_AUTH_ERR);
+ }
+ if ((code =3D ka_ChangePassword(user, /* kerberos name */
+=09 =09 instance, /* instance */
+=09=09=09 conn, /* conn */
+=09=09=09 0, /* old password unused */
+=09=09=09 &newkey /* new password */ )) !=3D 0) {
+=09pam_afs_syslog(LOG_ERR, PAMAFS_KAPASS_FAIL);
+ memset(new_password, 0, strlen(new_password));
+ RET(PAM_AUTH_ERR);
+ } else {
+ pam_set_item(pamh, PAM_AUTHTOK, new_password);
+ RET(PAM_SUCCESS);
+ }
+=09
+ out:
+ if (password && torch_password) {
+ memset(password, 0, strlen(password));
+ }
+ (void) setlogmask(origmask);
+#ifndef AFS_SUN56_ENV
+ closelog();
+#endif
+ return retcode;
}
--- openafs-1.0.2.orig/src/pam/afs_message.c=09Thu Feb 22 12:20:09 2001
+++ openafs-1.0.2/src/pam/afs_message.c=09Wed Feb 28 12:35:59 2001
@@ -36,7 +36,7 @@
"AFS not available",=09=09=09/* 10: AFS_UNAVAIL=09*/
"AFS error code 0x%x",=09=09=09/* 11: AFS_ERROR=09*/
"AFS Authentication succeeded.\n",=09=09/* 12: LOGIN_OK=09=09*/
- "AFS Authentication failed for user %s. %s\n",
+ "AFS Authentication failed for user %s %s\n",
=09=09=09=09=09=09/* 13: LOGIN_FAILED=09*/
"AFS PAM error, code=3D%d",=09=09=09/* 14: PAMERROR=09=09*/
"AFS uid exceeds OS bounds.\n",=09=09/* 15: UID_OVERFLOW=09*/
@@ -64,6 +64,14 @@
"AFS ReInitializing creds for user %s\n",=09/* 31: REINITCRED=09*/
"AFS Failed to set PASSWORD_EXPIRES for user %s\n",
=09=09=09=09=09=09/* 32: PASSEXPFAIL */
+ "",
+ "",
+ "New AFS Password: ", /* 35: NEW_PWD_PROMPT */
+ "New AFS Password (again): ", /* 36: VERIFY_PWD_PROMPT *=
/
+ "Failed to change AFS password", /* 37: KRBPASS_FAIL */
+ "Missing PAM flag: %s", /* 38: FLAGS */
+ "ka error, code=3D%d", /* 39: KAERROR =
*/
+ "Passwords are not equal" /* 40: NE_PASSWORD */
};
=20
static int num_fallbacks =3D sizeof(fallback_messages)/sizeof(char *);
--- openafs-1.0.2.orig/src/pam/afs_message.c=09Thu Feb 22 12:20:09 2001
+++ openafs-1.0.2/src/pam/afs_message.c=09Wed Feb 28 12:35:59 2001
@@ -36,7 +36,7 @@
"AFS not available",=09=09=09/* 10: AFS_UNAVAIL=09*/
"AFS error code 0x%x",=09=09=09/* 11: AFS_ERROR=09*/
"AFS Authentication succeeded.\n",=09=09/* 12: LOGIN_OK=09=09*/
- "AFS Authentication failed for user %s. %s\n",
+ "AFS Authentication failed for user %s %s\n",
=09=09=09=09=09=09/* 13: LOGIN_FAILED=09*/
"AFS PAM error, code=3D%d",=09=09=09/* 14: PAMERROR=09=09*/
"AFS uid exceeds OS bounds.\n",=09=09/* 15: UID_OVERFLOW=09*/
@@ -64,6 +64,14 @@
"AFS ReInitializing creds for user %s\n",=09/* 31: REINITCRED=09*/
"AFS Failed to set PASSWORD_EXPIRES for user %s\n",
=09=09=09=09=09=09/* 32: PASSEXPFAIL */
+ "",
+ "",
+ "New AFS Password: ", /* 35: NEW_PWD_PROMPT */
+ "New AFS Password (again): ", /* 36: VERIFY_PWD_PROMPT *=
/
+ "Failed to change AFS password", /* 37: KRBPASS_FAIL */
+ "Missing PAM flag: %s", /* 38: FLAGS */
+ "ka error, code=3D%d", /* 39: KAERROR =
*/
+ "Passwords are not equal" /* 40: NE_PASSWORD */
};
=20
static int num_fallbacks =3D sizeof(fallback_messages)/sizeof(char *);
#### end patch