*/
#ifndef lint
-static char rcsid[] = "$Id: auth.c,v 1.2 1993/12/14 05:40:50 paulus Exp $";
+static char rcsid[] = "$Id: auth.c,v 1.40 1999/01/19 23:59:14 paulus Exp $";
#endif
#include <stdio.h>
#include <stddef.h>
+#include <stdlib.h>
+#include <unistd.h>
#include <syslog.h>
#include <pwd.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
+#include <sys/socket.h>
+#include <utmp.h>
+#include <fcntl.h>
+#if defined(_PATH_LASTLOG) && defined(_linux_)
+#include <lastlog.h>
+#endif
#include <netdb.h>
#include <netinet/in.h>
#include <arpa/inet.h>
-#include "ppp.h"
+#ifdef USE_PAM
+#include <security/pam_appl.h>
+#endif
+
+#ifdef HAS_SHADOW
+#include <shadow.h>
+#ifndef PW_PPP
+#define PW_PPP PW_LOGIN
+#endif
+#endif
+
#include "pppd.h"
#include "fsm.h"
#include "lcp.h"
+#include "ipcp.h"
#include "upap.h"
#include "chap.h"
-#include "ipcp.h"
+#ifdef CBCP_SUPPORT
+#include "cbcp.h"
+#endif
#include "pathnames.h"
-#ifdef sparc
-#include <alloca.h>
-#ifndef __GNUC__
-/* why alloca.h doesn't define what alloca() returns is a mystery */
-/* char *alloca __ARGS((int)); */
-#endif /*__GNUC__*/
-#endif /*sparc*/
-
/* Used for storing a sequence of words. Usually malloced. */
struct wordlist {
struct wordlist *next;
#define FALSE 0
#define TRUE 1
-extern char user[];
-extern char passwd[];
-extern char devname[];
-extern char our_name[];
-extern char remote_name[];
-extern char hostname[];
-extern int uselogin;
-extern int usehostname;
-extern int auth_required;
+/* The name by which the peer authenticated itself to us. */
+char peer_authname[MAXNAMELEN];
/* Records which authentication operations haven't completed yet. */
-static int auth_pending[NPPP];
+static int auth_pending[NUM_PPP];
+
+/* Set if we have successfully called plogin() */
static int logged_in;
-static struct wordlist *addresses[NPPP];
+
+/* Set if we have run the /etc/ppp/auth-up script. */
+static int did_authup;
+static pid_t authup_pid; /* process ID of auth-up/down script */
+
+/* List of addresses which the peer may use. */
+static struct wordlist *addresses[NUM_PPP];
+
+/* Number of network protocols which we have opened. */
+static int num_np_open;
+
+/* Number of network protocols which have come up. */
+static int num_np_up;
+
+/* Set if we got the contents of passwd[] from the pap-secrets file. */
+static int passwd_from_file;
+
+/*
+ * Option variables.
+ */
+bool uselogin = 0; /* Use /etc/passwd for checking PAP */
+bool cryptpap = 0; /* Passwords in pap-secrets are encrypted */
+bool refuse_pap = 0; /* Don't wanna auth. ourselves with PAP */
+bool refuse_chap = 0; /* Don't wanna auth. ourselves with CHAP */
+bool usehostname = 0; /* Use hostname for our_name */
+bool auth_required = 0; /* Always require authentication from peer */
+bool allow_any_ip = 0; /* Allow peer to use any IP address */
/* Bits in auth_pending[] */
-#define UPAP_WITHPEER 1
-#define UPAP_PEER 2
+#define PAP_WITHPEER 1
+#define PAP_PEER 2
#define CHAP_WITHPEER 4
#define CHAP_PEER 8
-/* Prototypes */
-void check_access __ARGS((FILE *, char *));
+extern char *crypt __P((const char *, const char *));
+
+/* Prototypes for procedures local to this file. */
+
+static void network_phase __P((int));
+static void check_idle __P((void *));
+static void connect_time_expired __P((void *));
+static int plogin __P((char *, char *, char **, int *));
+static void plogout __P((void));
+static int null_login __P((int));
+static int get_pap_passwd __P((char *));
+static int have_pap_secret __P((void));
+static int have_chap_secret __P((char *, char *, u_int32_t));
+static int ip_addr_check __P((u_int32_t, struct wordlist *));
+static int scan_authfile __P((FILE *, char *, char *, u_int32_t, char *,
+ struct wordlist **, char *));
+static void free_wordlist __P((struct wordlist *));
+static void auth_script __P((char *));
+static void set_allowed_addrs __P((int, struct wordlist *));
+
+#ifdef OLD_OPTIONS
+static int setupapfile __P((char **));
+#endif
-static int login __ARGS((char *, char *, char **, int *));
-static void logout __ARGS((void));
-static int get_upap_passwd __ARGS((void));
-static int have_upap_secret __ARGS((void));
-static int have_chap_secret __ARGS((char *, char *));
-static int scan_authfile __ARGS((FILE *, char *, char *, char *,
- struct wordlist **, char *));
-static void free_wordlist __ARGS((struct wordlist *));
+/*
+ * Authentication-related options.
+ */
+option_t auth_options[] = {
+ { "require-pap", o_bool, &lcp_wantoptions[0].neg_upap,
+ "Require PAP authentication from peer", 1, &auth_required },
+ { "+pap", o_bool, &lcp_wantoptions[0].neg_upap,
+ "Require PAP authentication from peer", 1, &auth_required },
+ { "refuse-pap", o_bool, &refuse_pap,
+ "Don't agree to auth to peer with PAP", 1 },
+ { "-pap", o_bool, &refuse_pap,
+ "Don't allow UPAP authentication with peer", 1 },
+ { "require-chap", o_bool, &lcp_wantoptions[0].neg_chap,
+ "Require CHAP authentication from peer", 1, &auth_required },
+ { "+chap", o_bool, &lcp_wantoptions[0].neg_chap,
+ "Require CHAP authentication from peer", 1, &auth_required },
+ { "refuse-chap", o_bool, &refuse_chap,
+ "Don't agree to auth to peer with CHAP", 1 },
+ { "-chap", o_bool, &refuse_chap,
+ "Don't allow CHAP authentication with peer", 1 },
+ { "name", o_string, our_name,
+ "Set local name for authentication",
+ OPT_PRIV|OPT_STATIC, NULL, MAXNAMELEN },
+ { "user", o_string, user,
+ "Set name for auth with peer", OPT_STATIC, NULL, MAXNAMELEN },
+ { "usehostname", o_bool, &usehostname,
+ "Must use hostname for authentication", 1 },
+ { "remotename", o_string, remote_name,
+ "Set remote name for authentication", OPT_STATIC, NULL, MAXNAMELEN },
+ { "auth", o_bool, &auth_required,
+ "Require authentication from peer", 1 },
+ { "noauth", o_bool, &auth_required,
+ "Don't require peer to authenticate", OPT_PRIV, &allow_any_ip },
+ { "login", o_bool, &uselogin,
+ "Use system password database for PAP", 1 },
+ { "papcrypt", o_bool, &cryptpap,
+ "PAP passwords are encrypted", 1 },
+#if OLD_OPTIONS
+ { "+ua", o_special, setupapfile,
+ "Get PAP user and password from file" },
+#endif
+ { NULL }
+};
+
+#if OLD_OPTIONS
+/*
+ * setupapfile - specifies UPAP info for authenticating with peer.
+ */
+static int
+setupapfile(argv)
+ char **argv;
+{
+ FILE * ufile;
+ int l;
+
+ lcp_allowoptions[0].neg_upap = 1;
+
+ /* open user info file */
+ if ((ufile = fopen(*argv, "r")) == NULL) {
+ option_error("unable to open user login data file %s", *argv);
+ return 0;
+ }
+ if (!readable(fileno(ufile))) {
+ option_error("%s: access denied", *argv);
+ return 0;
+ }
+ check_access(ufile, *argv);
+
+ /* get username */
+ if (fgets(user, MAXNAMELEN - 1, ufile) == NULL
+ || fgets(passwd, MAXSECRETLEN - 1, ufile) == NULL){
+ option_error("unable to read user login data file %s", *argv);
+ return 0;
+ }
+ fclose(ufile);
+
+ /* get rid of newlines */
+ l = strlen(user);
+ if (l > 0 && user[l-1] == '\n')
+ user[l-1] = 0;
+ l = strlen(passwd);
+ if (l > 0 && passwd[l-1] == '\n')
+ passwd[l-1] = 0;
+
+ return (1);
+}
+#endif
-extern char *crypt __ARGS((char *, char *));
/*
* An Open on LCP has requested a change from Dead to Establish phase.
link_terminated(unit)
int unit;
{
+ if (phase == PHASE_DEAD)
+ return;
if (logged_in)
- logout();
- if (lcp_wantoptions[unit].restart) {
- lcp_lowerdown(unit);
- lcp_lowerup(unit);
- } else
- EXIT(unit);
+ plogout();
+ phase = PHASE_DEAD;
+ syslog(LOG_NOTICE, "Connection terminated.");
+}
+
+/*
+ * LCP has gone down; it will either die or try to re-establish.
+ */
+void
+link_down(unit)
+ int unit;
+{
+ int i;
+ struct protent *protp;
+
+ if (did_authup) {
+ auth_script(_PATH_AUTHDOWN);
+ did_authup = 0;
+ }
+ for (i = 0; (protp = protocols[i]) != NULL; ++i) {
+ if (!protp->enabled_flag)
+ continue;
+ if (protp->protocol != PPP_LCP && protp->lowerdown != NULL)
+ (*protp->lowerdown)(unit);
+ if (protp->protocol < 0xC000 && protp->close != NULL)
+ (*protp->close)(unit, "LCP down");
+ }
+ num_np_open = 0;
+ num_np_up = 0;
+ if (phase != PHASE_DEAD)
+ phase = PHASE_TERMINATE;
}
/*
lcp_options *wo = &lcp_wantoptions[unit];
lcp_options *go = &lcp_gotoptions[unit];
lcp_options *ho = &lcp_hisoptions[unit];
+ int i;
+ struct protent *protp;
+
+ /*
+ * Tell higher-level protocols that LCP is up.
+ */
+ for (i = 0; (protp = protocols[i]) != NULL; ++i)
+ if (protp->protocol != PPP_LCP && protp->enabled_flag
+ && protp->lowerup != NULL)
+ (*protp->lowerup)(unit);
if (auth_required && !(go->neg_chap || go->neg_upap)) {
/*
- * We wanted the peer to authenticate himself, and he refused:
- * tell him to go away.
+ * We wanted the peer to authenticate itself, and it refused:
+ * treat it as though it authenticated with PAP using a username
+ * of "" and a password of "". If that's not OK, boot it out.
*/
- syslog(LOG_WARNING, "peer refused to authenticate");
- lcp_close(unit);
- return;
+ if (!wo->neg_upap || !null_login(unit)) {
+ syslog(LOG_WARNING, "peer refused to authenticate");
+ lcp_close(unit, "peer refused to authenticate");
+ return;
+ }
}
+ phase = PHASE_AUTHENTICATE;
auth = 0;
if (go->neg_chap) {
ChapAuthPeer(unit, our_name, go->chap_mdtype);
auth |= CHAP_PEER;
} else if (go->neg_upap) {
upap_authpeer(unit);
- auth |= UPAP_PEER;
+ auth |= PAP_PEER;
}
if (ho->neg_chap) {
- ChapAuthWithPeer(unit, our_name, ho->chap_mdtype);
+ ChapAuthWithPeer(unit, user, ho->chap_mdtype);
auth |= CHAP_WITHPEER;
} else if (ho->neg_upap) {
+ if (passwd[0] == 0) {
+ passwd_from_file = 1;
+ if (!get_pap_passwd(passwd))
+ syslog(LOG_ERR, "No secret found for PAP login");
+ }
upap_authwithpeer(unit, user, passwd);
- auth |= UPAP_WITHPEER;
+ auth |= PAP_WITHPEER;
}
auth_pending[unit] = auth;
if (!auth)
- ipcp_open(unit);
+ network_phase(unit);
+}
+
+/*
+ * Proceed to the network phase.
+ */
+static void
+network_phase(unit)
+ int unit;
+{
+ int i;
+ struct protent *protp;
+ lcp_options *go = &lcp_gotoptions[unit];
+
+ /*
+ * If the peer had to authenticate, run the auth-up script now.
+ */
+ if ((go->neg_chap || go->neg_upap) && !did_authup) {
+ auth_script(_PATH_AUTHUP);
+ did_authup = 1;
+ }
+
+#ifdef CBCP_SUPPORT
+ /*
+ * If we negotiated callback, do it now.
+ */
+ if (go->neg_cbcp) {
+ phase = PHASE_CALLBACK;
+ (*cbcp_protent.open)(unit);
+ return;
+ }
+#endif
+
+ phase = PHASE_NETWORK;
+#if 0
+ if (!demand)
+ set_filters(&pass_filter, &active_filter);
+#endif
+ for (i = 0; (protp = protocols[i]) != NULL; ++i)
+ if (protp->protocol < 0xC000 && protp->enabled_flag
+ && protp->open != NULL) {
+ (*protp->open)(unit);
+ if (protp->protocol != PPP_CCP)
+ ++num_np_open;
+ }
+
+ if (num_np_open == 0)
+ /* nothing to do */
+ lcp_close(0, "No network protocols running");
}
/*
/*
* Authentication failure: take the link down
*/
- lcp_close(unit);
+ lcp_close(unit, "Authentication failed");
}
/*
* The peer has been successfully authenticated using `protocol'.
*/
void
-auth_peer_success(unit, protocol)
+auth_peer_success(unit, protocol, name, namelen)
int unit, protocol;
+ char *name;
+ int namelen;
{
int bit;
switch (protocol) {
- case CHAP:
+ case PPP_CHAP:
bit = CHAP_PEER;
break;
- case UPAP:
- bit = UPAP_PEER;
+ case PPP_PAP:
+ bit = PAP_PEER;
break;
default:
syslog(LOG_WARNING, "auth_peer_success: unknown protocol %x",
return;
}
+ /*
+ * Save the authenticated name of the peer for later.
+ */
+ if (namelen > sizeof(peer_authname) - 1)
+ namelen = sizeof(peer_authname) - 1;
+ BCOPY(name, peer_authname, namelen);
+ peer_authname[namelen] = 0;
+ script_setenv("PEERNAME", peer_authname);
+
/*
* If there is no more authentication still to be done,
- * proceed to the network phase.
+ * proceed to the network (or callback) phase.
*/
if ((auth_pending[unit] &= ~bit) == 0)
- ipcp_open(unit);
+ network_phase(unit);
}
/*
auth_withpeer_fail(unit, protocol)
int unit, protocol;
{
+ if (passwd_from_file)
+ BZERO(passwd, MAXSECRETLEN);
/*
* We've failed to authenticate ourselves to our peer.
* He'll probably take the link down, and there's not much
int bit;
switch (protocol) {
- case CHAP:
+ case PPP_CHAP:
bit = CHAP_WITHPEER;
break;
- case UPAP:
- bit = UPAP_WITHPEER;
+ case PPP_PAP:
+ if (passwd_from_file)
+ BZERO(passwd, MAXSECRETLEN);
+ bit = PAP_WITHPEER;
break;
default:
syslog(LOG_WARNING, "auth_peer_success: unknown protocol %x",
protocol);
+ bit = 0;
}
/*
* If there is no more authentication still being done,
- * proceed to the network phase.
+ * proceed to the network (or callback) phase.
*/
if ((auth_pending[unit] &= ~bit) == 0)
- ipcp_open(unit);
+ network_phase(unit);
}
/*
- * check_auth_options - called to check authentication options.
+ * np_up - a network protocol has come up.
*/
void
-check_auth_options()
+np_up(unit, proto)
+ int unit, proto;
+{
+ if (num_np_up == 0) {
+ /*
+ * At this point we consider that the link has come up successfully.
+ */
+ need_holdoff = 0;
+
+ if (idle_time_limit > 0)
+ TIMEOUT(check_idle, NULL, idle_time_limit);
+
+ /*
+ * Set a timeout to close the connection once the maximum
+ * connect time has expired.
+ */
+ if (maxconnect > 0)
+ TIMEOUT(connect_time_expired, 0, maxconnect);
+
+ /*
+ * Detach now, if the updetach option was given.
+ */
+ if (updetach && !nodetach)
+ detach();
+ }
+ ++num_np_up;
+}
+
+/*
+ * np_down - a network protocol has gone down.
+ */
+void
+np_down(unit, proto)
+ int unit, proto;
+{
+ if (--num_np_up == 0 && idle_time_limit > 0) {
+ UNTIMEOUT(check_idle, NULL);
+ }
+}
+
+/*
+ * np_finished - a network protocol has finished using the link.
+ */
+void
+np_finished(unit, proto)
+ int unit, proto;
+{
+ if (--num_np_open <= 0) {
+ /* no further use for the link: shut up shop. */
+ lcp_close(0, "No network protocols running");
+ }
+}
+
+/*
+ * check_idle - check whether the link has been idle for long
+ * enough that we can shut it down.
+ */
+static void
+check_idle(arg)
+ void *arg;
+{
+ struct ppp_idle idle;
+ time_t itime;
+
+ if (!get_idle_time(0, &idle))
+ return;
+ itime = MIN(idle.xmit_idle, idle.recv_idle);
+ if (itime >= idle_time_limit) {
+ /* link is idle: shut it down. */
+ syslog(LOG_INFO, "Terminating connection due to lack of activity.");
+ lcp_close(0, "Link inactive");
+ } else {
+ TIMEOUT(check_idle, NULL, idle_time_limit - itime);
+ }
+}
+
+/*
+ * connect_time_expired - log a message and close the connection.
+ */
+static void
+connect_time_expired(arg)
+ void *arg;
+{
+ syslog(LOG_INFO, "Connect time expired");
+ lcp_close(0, "Connect time expired"); /* Close connection */
+}
+
+/*
+ * auth_check_options - called to check authentication options.
+ */
+void
+auth_check_options()
{
lcp_options *wo = &lcp_wantoptions[0];
- lcp_options *ao = &lcp_allowoptions[0];
+ int can_auth;
+ ipcp_options *ipwo = &ipcp_wantoptions[0];
+ u_int32_t remote;
/* Default our_name to hostname, and user to our_name */
if (our_name[0] == 0 || usehostname)
strcpy(user, our_name);
/* If authentication is required, ask peer for CHAP or PAP. */
- if (auth_required && !wo->neg_chap && !wo->neg_upap) {
- wo->neg_chap = 1;
- wo->neg_upap = 1;
+ if (auth_required) {
+ if (!wo->neg_chap && !wo->neg_upap) {
+ wo->neg_chap = 1;
+ wo->neg_upap = 1;
+ }
+ } else {
+ wo->neg_chap = 0;
+ wo->neg_upap = 0;
}
/*
* Check whether we have appropriate secrets to use
- * to authenticate ourselves and/or the peer.
+ * to authenticate the peer.
*/
- if (ao->neg_upap && passwd[0] == 0 && !get_upap_passwd())
- ao->neg_upap = 0;
- if (wo->neg_upap && !uselogin && !have_upap_secret())
- wo->neg_upap = 0;
- if (ao->neg_chap && !have_chap_secret(our_name, remote_name))
- ao->neg_chap = 0;
- if (wo->neg_chap && !have_chap_secret(remote_name, our_name))
- wo->neg_chap = 0;
+ can_auth = wo->neg_upap && (uselogin || have_pap_secret());
+ if (!can_auth && wo->neg_chap) {
+ remote = ipwo->accept_remote? 0: ipwo->hisaddr;
+ can_auth = have_chap_secret(remote_name, our_name, remote);
+ }
- if (auth_required && !wo->neg_chap && !wo->neg_upap) {
- fprintf(stderr, "\
-pppd: peer authentication required but no authentication files accessible\n");
+ if (auth_required && !can_auth) {
+ option_error("peer authentication required but no suitable secret(s) found\n");
+ if (remote_name[0] == 0)
+ option_error("for authenticating any peer to us (%s)\n", our_name);
+ else
+ option_error("for authenticating peer %s to us (%s)\n",
+ remote_name, our_name);
exit(1);
}
+ /*
+ * Check whether the user tried to override certain values
+ * set by root.
+ */
+ if (allow_any_ip) {
+ if ((connector != NULL && connector_info.priv == 0)
+ || (disconnector != NULL && disconnector_info.priv == 0)
+ || (welcomer != NULL && welcomer_info.priv == 0)) {
+ option_error("connect, disconnect and welcome options");
+ option_error("are privileged when noauth option is used");
+ exit(1);
+ }
+ }
+}
+
+/*
+ * auth_reset - called when LCP is starting negotiations to recheck
+ * authentication options, i.e. whether we have appropriate secrets
+ * to use for authenticating ourselves and/or the peer.
+ */
+void
+auth_reset(unit)
+ int unit;
+{
+ lcp_options *go = &lcp_gotoptions[unit];
+ lcp_options *ao = &lcp_allowoptions[0];
+ ipcp_options *ipwo = &ipcp_wantoptions[0];
+ u_int32_t remote;
+
+ ao->neg_upap = !refuse_pap && (passwd[0] != 0 || get_pap_passwd(NULL));
+ ao->neg_chap = !refuse_chap
+ && have_chap_secret(user, remote_name, (u_int32_t)0);
+
+ if (go->neg_upap && !uselogin && !have_pap_secret())
+ go->neg_upap = 0;
+ if (go->neg_chap) {
+ remote = ipwo->accept_remote? 0: ipwo->hisaddr;
+ if (!have_chap_secret(remote_name, our_name, remote))
+ go->neg_chap = 0;
+ }
}
char *filename;
FILE *f;
struct wordlist *addrs;
+ u_int32_t remote;
+ ipcp_options *ipwo = &ipcp_wantoptions[unit];
char passwd[256], user[256];
char secret[MAXWORDLEN];
static int attempts = 0;
passwd[passwdlen] = '\0';
BCOPY(auser, user, userlen);
user[userlen] = '\0';
+ *msg = (char *) 0;
/*
- * Open the file of upap secrets and scan for a suitable secret
+ * Open the file of pap secrets and scan for a suitable secret
* for authenticating this user.
*/
filename = _PATH_UPAPFILE;
ret = UPAP_AUTHACK;
f = fopen(filename, "r");
if (f == NULL) {
- if (!uselogin) {
- syslog(LOG_ERR, "Can't open upap password file %s: %m", filename);
- ret = UPAP_AUTHNAK;
- }
+ syslog(LOG_ERR, "Can't open PAP password file %s: %m", filename);
+ ret = UPAP_AUTHNAK;
} else {
check_access(f, filename);
- if (scan_authfile(f, user, our_name, secret, &addrs, filename) < 0
- || (secret[0] != 0 && strcmp(passwd, secret) != 0
+ remote = ipwo->accept_remote? 0: ipwo->hisaddr;
+ if (scan_authfile(f, user, our_name, remote,
+ secret, &addrs, filename) < 0
+ || (secret[0] != 0 && (cryptpap || strcmp(passwd, secret) != 0)
&& strcmp(crypt(passwd, secret), secret) != 0)) {
- syslog(LOG_WARNING, "upap authentication failure for %s", user);
+ syslog(LOG_WARNING, "PAP authentication failure for %s", user);
ret = UPAP_AUTHNAK;
}
fclose(f);
}
if (uselogin && ret == UPAP_AUTHACK) {
- ret = login(user, passwd, msg, msglen);
+ ret = plogin(user, passwd, msg, msglen);
if (ret == UPAP_AUTHNAK) {
- syslog(LOG_WARNING, "upap login failure for %s", user);
+ syslog(LOG_WARNING, "PAP login failure for %s", user);
}
}
if (ret == UPAP_AUTHNAK) {
- *msg = "Login incorrect";
+ if (*msg == (char *) 0)
+ *msg = "Login incorrect";
*msglen = strlen(*msg);
/*
* Frustrate passwd stealer programs.
*/
if (attempts++ >= 10) {
syslog(LOG_WARNING, "%d LOGIN FAILURES ON %s, %s",
- attempts, devname, user);
+ attempts, devnam, user);
quit();
}
if (attempts > 3)
} else {
attempts = 0; /* Reset count */
- *msg = "Login ok";
+ if (*msg == (char *) 0)
+ *msg = "Login ok";
*msglen = strlen(*msg);
- if (addresses[unit] != NULL)
- free_wordlist(addresses[unit]);
- addresses[unit] = addrs;
+ set_allowed_addrs(unit, addrs);
}
+ BZERO(passwd, sizeof(passwd));
+ BZERO(secret, sizeof(secret));
+
return ret;
}
+/*
+ * This function is needed for PAM.
+ */
+
+#ifdef USE_PAM
+static char *PAM_username = "";
+static char *PAM_password = "";
+
+#ifdef PAM_ESTABLISH_CRED /* new PAM defines :(^ */
+#define MY_PAM_STRERROR(err_code) (char *) pam_strerror(pamh,err_code)
+#else
+#define MY_PAM_STRERROR(err_code) (char *) pam_strerror(err_code)
+#endif
+
+static int pam_conv (int num_msg,
+ const struct pam_message **msg,
+ struct pam_response **resp,
+ void *appdata_ptr)
+{
+ int count = 0, replies = 0;
+ struct pam_response *reply = NULL;
+ int size = 0;
+
+ for (count = 0; count < num_msg; count++)
+ {
+ size += sizeof (struct pam_response);
+ reply = realloc (reply, size); /* ANSI: is malloc() if reply==NULL */
+ if (!reply)
+ return PAM_CONV_ERR;
+
+ switch (msg[count]->msg_style)
+ {
+ case PAM_PROMPT_ECHO_ON:
+ reply[replies].resp_retcode = PAM_SUCCESS;
+ reply[replies++].resp = strdup(PAM_username); /* never NULL */
+ break;
+
+ case PAM_PROMPT_ECHO_OFF:
+ reply[replies].resp_retcode = PAM_SUCCESS;
+ reply[replies++].resp = strdup(PAM_password); /* never NULL */
+ break;
+
+ case PAM_TEXT_INFO:
+ reply[replies].resp_retcode = PAM_SUCCESS;
+ reply[replies++].resp = NULL;
+ break;
+
+ case PAM_ERROR_MSG:
+ default:
+ free (reply);
+ return PAM_CONV_ERR;
+ }
+ }
+
+ if (resp)
+ *resp = reply;
+ else
+ free (reply);
+
+ return PAM_SUCCESS;
+}
+#endif
/*
- * login - Check the user name and password against the system
+ * plogin - Check the user name and password against the system
* password database, and login the user if OK.
*
* returns:
* UPAP_AUTHACK: Login succeeded.
* In either case, msg points to an appropriate message.
*/
+
static int
-login(user, passwd, msg, msglen)
+plogin(user, passwd, msg, msglen)
char *user;
char *passwd;
char **msg;
int *msglen;
{
+
+#ifdef USE_PAM
+
+ struct pam_conv pam_conversation;
+ pam_handle_t *pamh;
+ int pam_error;
+/*
+ * Fill the pam_conversion structure
+ */
+ memset (&pam_conversation, '\0', sizeof (struct pam_conv));
+ pam_conversation.conv = &pam_conv;
+
+ pam_error = pam_start ("ppp", user, &pam_conversation, &pamh);
+
+ if (pam_error != PAM_SUCCESS) {
+ *msg = MY_PAM_STRERROR (pam_error);
+ return UPAP_AUTHNAK;
+ }
+/*
+ * Define the fields for the credintial validation
+ */
+ (void) pam_set_item (pamh, PAM_TTY, devnam);
+ PAM_username = user;
+ PAM_password = passwd;
+/*
+ * Validate the user
+ */
+ pam_error = pam_authenticate (pamh, PAM_SILENT);
+ if (pam_error == PAM_SUCCESS) {
+ pam_error = pam_acct_mgmt (pamh, PAM_SILENT);
+
+ /* start a session for this user. Session closed when link ends. */
+ if (pam_error == PAM_SUCCESS)
+ (void) pam_open_session (pamh, PAM_SILENT);
+ }
+
+ *msg = MY_PAM_STRERROR (pam_error);
+
+ PAM_username =
+ PAM_password = "";
+/*
+ * Clean up the mess
+ */
+ (void) pam_end (pamh, pam_error);
+
+ if (pam_error != PAM_SUCCESS)
+ return UPAP_AUTHNAK;
+/*
+ * Use the non-PAM methods directly
+ */
+#else /* #ifdef USE_PAM */
+
struct passwd *pw;
- char *epasswd;
char *tty;
- if ((pw = getpwnam(user)) == NULL) {
+#ifdef HAS_SHADOW
+ struct spwd *spwd;
+ struct spwd *getspnam();
+#endif
+
+ pw = getpwnam(user);
+ endpwent();
+ if (pw == NULL) {
return (UPAP_AUTHNAK);
}
- /*
- * XXX If no passwd, let them login without one.
- */
- if (pw->pw_passwd == '\0') {
- return (UPAP_AUTHACK);
+#ifdef HAS_SHADOW
+ spwd = getspnam(user);
+ endspent();
+ if (spwd) {
+ /* check the age of the password entry */
+ long now = time(NULL) / 86400L;
+
+ if ((spwd->sp_expire > 0 && now >= spwd->sp_expire)
+ || ((spwd->sp_max >= 0 && spwd->sp_max < 10000)
+ && spwd->sp_lstchg >= 0
+ && now >= spwd->sp_lstchg + spwd->sp_max)) {
+ syslog(LOG_WARNING, "Password for %s has expired", user);
+ return (UPAP_AUTHNAK);
+ }
+ pw->pw_passwd = spwd->sp_pwdp;
}
+#endif
- epasswd = crypt(passwd, pw->pw_passwd);
- if (strcmp(epasswd, pw->pw_passwd)) {
+ /*
+ * If no passwd, don't let them login.
+ */
+ if (pw->pw_passwd == NULL || *pw->pw_passwd == '\0'
+ || strcmp(crypt(passwd, pw->pw_passwd), pw->pw_passwd) != 0)
return (UPAP_AUTHNAK);
- }
- syslog(LOG_INFO, "user %s logged in", user);
+ /* These functions are not enabled for PAM. The reason for this is that */
+ /* there is not necessarily a "passwd" entry for this user. That is */
+ /* real purpose of 'PAM' -- to virtualize the account data from the */
+ /* application. If you want to do the same thing, write the entry in */
+ /* the 'session' hook. */
/*
* Write a wtmp entry for this user.
*/
- tty = strrchr(devname, '/');
- if (tty == NULL)
- tty = devname;
- else
- tty++;
- logwtmp(tty, user, ""); /* Add wtmp login entry */
+
+ tty = devnam;
+ if (strncmp(tty, "/dev/", 5) == 0)
+ tty += 5;
+ logwtmp(tty, user, remote_name); /* Add wtmp login entry */
+
+#if defined(_PATH_LASTLOG)
+ {
+ struct lastlog ll;
+ int fd;
+
+ if ((fd = open(_PATH_LASTLOG, O_RDWR, 0)) >= 0) {
+ (void)lseek(fd, (off_t)(pw->pw_uid * sizeof(ll)), SEEK_SET);
+ memset((void *)&ll, 0, sizeof(ll));
+ (void)time(&ll.ll_time);
+ (void)strncpy(ll.ll_line, tty, sizeof(ll.ll_line));
+ (void)write(fd, (char *)&ll, sizeof(ll));
+ (void)close(fd);
+ }
+ }
+#endif
+
+#endif /* #ifdef USE_PAM */
+
+ syslog(LOG_INFO, "user %s logged in", user);
logged_in = TRUE;
return (UPAP_AUTHACK);
}
/*
- * logout - Logout the user.
+ * plogout - Logout the user.
*/
static void
-logout()
+plogout()
{
+#ifdef USE_PAM
+ struct pam_conv pam_conversation;
+ pam_handle_t *pamh;
+ int pam_error;
+/*
+ * Fill the pam_conversion structure. The PAM specification states that the
+ * session must be able to be closed by a totally different handle from which
+ * it was created. Hold the PAM group to their own specification!
+ */
+ memset (&pam_conversation, '\0', sizeof (struct pam_conv));
+ pam_conversation.conv = &pam_conv;
+
+ pam_error = pam_start ("ppp", user, &pam_conversation, &pamh);
+ if (pam_error == PAM_SUCCESS) {
+ (void) pam_set_item (pamh, PAM_TTY, devnam);
+ (void) pam_close_session (pamh, PAM_SILENT);
+ (void) pam_end (pamh, PAM_SUCCESS);
+ }
+
+#else
char *tty;
- tty = strrchr(devname, '/');
- if (tty == NULL)
- tty = devname;
- else
- tty++;
- logwtmp(tty, "", ""); /* Wipe out wtmp logout entry */
+ tty = devnam;
+ if (strncmp(tty, "/dev/", 5) == 0)
+ tty += 5;
+ logwtmp(tty, "", ""); /* Wipe out utmp logout entry */
+#endif
+
logged_in = FALSE;
}
/*
- * get_upap_passwd - get a password for authenticating ourselves with
+ * null_login - Check if a username of "" and a password of "" are
+ * acceptable, and iff so, set the list of acceptable IP addresses
+ * and return 1.
+ */
+static int
+null_login(unit)
+ int unit;
+{
+ char *filename;
+ FILE *f;
+ int i, ret;
+ struct wordlist *addrs;
+ char secret[MAXWORDLEN];
+
+ /*
+ * Open the file of pap secrets and scan for a suitable secret.
+ * We don't accept a wildcard client.
+ */
+ filename = _PATH_UPAPFILE;
+ addrs = NULL;
+ f = fopen(filename, "r");
+ if (f == NULL)
+ return 0;
+ check_access(f, filename);
+
+ i = scan_authfile(f, "", our_name, (u_int32_t)0, secret, &addrs, filename);
+ ret = i >= 0 && (i & NONWILD_CLIENT) != 0 && secret[0] == 0;
+ BZERO(secret, sizeof(secret));
+
+ if (ret)
+ set_allowed_addrs(unit, addrs);
+ else
+ free_wordlist(addrs);
+
+ fclose(f);
+ return ret;
+}
+
+
+/*
+ * get_pap_passwd - get a password for authenticating ourselves with
* our peer using PAP. Returns 1 on success, 0 if no suitable password
* could be found.
*/
static int
-get_upap_passwd()
+get_pap_passwd(passwd)
+ char *passwd;
{
char *filename;
FILE *f;
+ int ret;
struct wordlist *addrs;
char secret[MAXWORDLEN];
if (f == NULL)
return 0;
check_access(f, filename);
- if (scan_authfile(f, user, remote_name, secret, NULL, filename) < 0)
+ ret = scan_authfile(f, user,
+ remote_name[0]? remote_name: NULL,
+ (u_int32_t)0, secret, NULL, filename);
+ fclose(f);
+ if (ret < 0)
return 0;
- strncpy(passwd, secret, MAXSECRETLEN);
- passwd[MAXSECRETLEN-1] = 0;
+ if (passwd != NULL) {
+ strncpy(passwd, secret, MAXSECRETLEN);
+ passwd[MAXSECRETLEN-1] = 0;
+ }
+ BZERO(secret, sizeof(secret));
return 1;
}
/*
- * have_upap_secret - check whether we have a PAP file with any
+ * have_pap_secret - check whether we have a PAP file with any
* secrets that we could possibly use for authenticating the peer.
*/
static int
-have_upap_secret()
+have_pap_secret()
{
FILE *f;
int ret;
char *filename;
+ ipcp_options *ipwo = &ipcp_wantoptions[0];
+ u_int32_t remote;
filename = _PATH_UPAPFILE;
f = fopen(filename, "r");
if (f == NULL)
return 0;
- ret = scan_authfile(f, NULL, our_name, NULL, NULL, filename);
+ remote = ipwo->accept_remote? 0: ipwo->hisaddr;
+ ret = scan_authfile(f, NULL, our_name, remote, NULL, NULL, filename);
fclose(f);
if (ret < 0)
return 0;
* know the identity yet.
*/
static int
-have_chap_secret(client, server)
+have_chap_secret(client, server, remote)
char *client;
char *server;
+ u_int32_t remote;
{
FILE *f;
int ret;
else if (server[0] == 0)
server = NULL;
- ret = scan_authfile(f, client, server, NULL, NULL, filename);
+ ret = scan_authfile(f, client, server, remote, NULL, NULL, filename);
fclose(f);
if (ret < 0)
return 0;
char *server;
char *secret;
int *secret_len;
+ int save_addrs;
{
FILE *f;
int ret, len;
}
check_access(f, filename);
- ret = scan_authfile(f, client, server, secbuf, &addrs, filename);
+ ret = scan_authfile(f, client, server, (u_int32_t)0,
+ secbuf, &addrs, filename);
fclose(f);
if (ret < 0)
return 0;
- if (save_addrs) {
- if (addresses[unit] != NULL)
- free_wordlist(addresses[unit]);
- addresses[unit] = addrs;
- }
+ if (save_addrs)
+ set_allowed_addrs(unit, addrs);
len = strlen(secbuf);
if (len > MAXSECRETLEN) {
len = MAXSECRETLEN;
}
BCOPY(secbuf, secret, len);
+ BZERO(secbuf, sizeof(secbuf));
*secret_len = len;
return 1;
}
+/*
+ * set_allowed_addrs() - set the list of allowed addresses.
+ */
+static void
+set_allowed_addrs(unit, addrs)
+ int unit;
+ struct wordlist *addrs;
+{
+ if (addresses[unit] != NULL)
+ free_wordlist(addresses[unit]);
+ addresses[unit] = addrs;
+
+ /*
+ * If there's only one authorized address we might as well
+ * ask our peer for that one right away
+ */
+ if (addrs != NULL && addrs->next == NULL) {
+ char *p = addrs->word;
+ struct ipcp_options *wo = &ipcp_wantoptions[unit];
+ u_int32_t a;
+ struct hostent *hp;
+
+ if (*p != '!' && *p != '-' && *p != '*' && strchr(p, '/') == NULL) {
+ hp = gethostbyname(p);
+ if (hp != NULL && hp->h_addrtype == AF_INET)
+ a = *(u_int32_t *)hp->h_addr;
+ else
+ a = inet_addr(p);
+ if (a != (u_int32_t) -1)
+ wo->hisaddr = a;
+ }
+ }
+}
+
/*
* auth_ip_addr - check whether the peer is authorized to use
* a given IP address. Returns 1 if authorized, 0 otherwise.
int
auth_ip_addr(unit, addr)
int unit;
- u_long addr;
+ u_int32_t addr;
{
- u_long a;
- struct hostent *hp;
+ return ip_addr_check(addr, addresses[unit]);
+}
+
+static int
+ip_addr_check(addr, addrs)
+ u_int32_t addr;
struct wordlist *addrs;
+{
+ u_int32_t a, mask, ah;
+ int accept;
+ char *ptr_word, *ptr_mask;
+ struct hostent *hp;
+ struct netent *np;
+
+ /* don't allow loopback or multicast address */
+ if (bad_ip_adrs(addr))
+ return 0;
- if ((addrs = addresses[unit]) == NULL)
- return 1; /* no restriction */
+ if (addrs == NULL) {
+ if (auth_required)
+ return 0; /* no addresses authorized */
+ return allow_any_ip || !have_route_to(addr);
+ }
for (; addrs != NULL; addrs = addrs->next) {
- /* "-" means no addresses authorized */
- if (strcmp(addrs->word, "-") == 0)
+ /* "-" means no addresses authorized, "*" means any address allowed */
+ ptr_word = addrs->word;
+ if (strcmp(ptr_word, "-") == 0)
break;
- if ((a = inet_addr(addrs->word)) == -1) {
- if ((hp = gethostbyname(addrs->word)) == NULL) {
- syslog(LOG_WARNING, "unknown host %s in auth. address list",
- addrs->word);
+ if (strcmp(ptr_word, "*") == 0)
+ return 1;
+
+ accept = 1;
+ if (*ptr_word == '!') {
+ accept = 0;
+ ++ptr_word;
+ }
+
+ mask = ~ (u_int32_t) 0;
+ ptr_mask = strchr (ptr_word, '/');
+ if (ptr_mask != NULL) {
+ int bit_count;
+
+ bit_count = (int) strtol (ptr_mask+1, (char **) 0, 10);
+ if (bit_count <= 0 || bit_count > 32) {
+ syslog (LOG_WARNING,
+ "invalid address length %s in auth. address list",
+ ptr_mask);
continue;
- } else
- a = *(u_long *)hp->h_addr;
+ }
+ *ptr_mask = '\0';
+ mask <<= 32 - bit_count;
}
- if (addr == a)
- return 1;
+
+ hp = gethostbyname(ptr_word);
+ if (hp != NULL && hp->h_addrtype == AF_INET) {
+ a = *(u_int32_t *)hp->h_addr;
+ } else {
+ np = getnetbyname (ptr_word);
+ if (np != NULL && np->n_addrtype == AF_INET) {
+ a = htonl (*(u_int32_t *)np->n_net);
+ if (ptr_mask == NULL) {
+ /* calculate appropriate mask for net */
+ ah = ntohl(a);
+ if (IN_CLASSA(ah))
+ mask = IN_CLASSA_NET;
+ else if (IN_CLASSB(ah))
+ mask = IN_CLASSB_NET;
+ else if (IN_CLASSC(ah))
+ mask = IN_CLASSC_NET;
+ }
+ } else {
+ a = inet_addr (ptr_word);
+ }
+ }
+
+ if (ptr_mask != NULL)
+ *ptr_mask = '/';
+
+ if (a == (u_int32_t)-1L)
+ syslog (LOG_WARNING,
+ "unknown host %s in auth. address list",
+ addrs->word);
+ else
+ /* Here a and addr are in network byte order,
+ and mask is in host order. */
+ if (((addr ^ a) & htonl(mask)) == 0)
+ return accept;
}
return 0; /* not in list => can't have it */
}
+/*
+ * bad_ip_adrs - return 1 if the IP address is one we don't want
+ * to use, such as an address in the loopback net or a multicast address.
+ * addr is in network byte order.
+ */
+int
+bad_ip_adrs(addr)
+ u_int32_t addr;
+{
+ addr = ntohl(addr);
+ return (addr >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET
+ || IN_MULTICAST(addr) || IN_BADCLASS(addr);
+}
+
/*
* check_access - complain if a secret file has too-liberal permissions.
*/
* info) are placed in a wordlist and returned in *addrs.
*/
static int
-scan_authfile(f, client, server, secret, addrs, filename)
+scan_authfile(f, client, server, ipaddr, secret, addrs, filename)
FILE *f;
char *client;
char *server;
+ u_int32_t ipaddr;
char *secret;
struct wordlist **addrs;
char *filename;
int newline, xxx;
int got_flag, best_flag;
FILE *sf;
- struct wordlist *ap, *addr_list, *addr_last;
+ struct wordlist *ap, *addr_list, *alist, *alast;
char word[MAXWORDLEN];
char atfile[MAXWORDLEN];
+ char lsecret[MAXWORDLEN];
if (addrs != NULL)
*addrs = NULL;
fclose(sf);
}
if (secret != NULL)
- strcpy(secret, word);
-
- best_flag = got_flag;
+ strcpy(lsecret, word);
/*
* Now read address authorization info and make a wordlist.
*/
- if (addr_list)
- free_wordlist(addr_list);
- addr_list = NULL;
+ alist = alast = NULL;
for (;;) {
if (!getword(f, word, &newline, filename) || newline)
break;
novm("authorized addresses");
ap->next = NULL;
strcpy(ap->word, word);
- if (addr_list == NULL)
- addr_list = ap;
+ if (alist == NULL)
+ alist = ap;
else
- addr_last->next = ap;
- addr_last = ap;
+ alast->next = ap;
+ alast = ap;
+ }
+
+ /*
+ * Check if the given IP address is allowed by the wordlist.
+ */
+ if (ipaddr != 0 && !ip_addr_check(ipaddr, alist)) {
+ free_wordlist(alist);
+ continue;
}
+
+ /*
+ * This is the best so far; remember it.
+ */
+ best_flag = got_flag;
+ if (addr_list)
+ free_wordlist(addr_list);
+ addr_list = alist;
+ if (secret != NULL)
+ strcpy(secret, lsecret);
+
if (!newline)
break;
}
wp = next;
}
}
+
+/*
+ * auth_script - execute a script with arguments
+ * interface-name peer-name real-user tty speed
+ */
+static void
+auth_script(script)
+ char *script;
+{
+ char strspeed[32];
+ struct passwd *pw;
+ char struid[32];
+ char *user_name;
+ char *argv[8];
+
+ if ((pw = getpwuid(getuid())) != NULL && pw->pw_name != NULL)
+ user_name = pw->pw_name;
+ else {
+ sprintf(struid, "%d", getuid());
+ user_name = struid;
+ }
+ sprintf(strspeed, "%d", baud_rate);
+
+ argv[0] = script;
+ argv[1] = ifname;
+ argv[2] = peer_authname;
+ argv[3] = user_name;
+ argv[4] = devnam;
+ argv[5] = strspeed;
+ argv[6] = NULL;
+
+ authup_pid = run_program(script, argv, 0, NULL, NULL);
+}
projects / ppp.git / blobdiff