*/
#ifndef lint
-static char rcsid[] = "$Id: auth.c,v 1.32 1997/07/14 03:52:33 paulus Exp $";
+static char rcsid[] = "$Id: auth.c,v 1.47 1999/03/19 01:17:51 paulus Exp $";
#endif
#include <stdio.h>
#include <stddef.h>
#include <stdlib.h>
#include <unistd.h>
-#include <syslog.h>
#include <pwd.h>
+#include <grp.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>
#ifdef USE_PAM
#include <security/pam_appl.h>
-#include <security/pam_modules.h>
#endif
#ifdef HAS_SHADOW
#include <shadow.h>
-#ifndef SVR4
-#include <shadow/pwauth.h>
-#endif
#ifndef PW_PPP
#define PW_PPP PW_LOGIN
#endif
/* Used for storing a sequence of words. Usually malloced. */
struct wordlist {
struct wordlist *next;
- char word[1];
+ char *word;
};
/* Bits in scan_authfile return value */
#define ISWILD(word) (word[0] == '*' && word[1] == 0)
-#define FALSE 0
-#define TRUE 1
-
/* 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[NUM_PPP];
-/* Set if we have successfully called login() */
+/* Set if we have successfully called plogin() */
static int logged_in;
-/* Set if we have run the /etc/ppp/auth-up script. */
-static int did_authup;
-
/* List of addresses which the peer may use. */
-static struct wordlist *addresses[NUM_PPP];
+static struct permitted_ip *addresses[NUM_PPP];
/* Number of network protocols which we have opened. */
static int num_np_open;
/* Set if we got the contents of passwd[] from the pap-secrets file. */
static int passwd_from_file;
+/*
+ * This is used to ensure that we don't start an auth-up/down
+ * script while one is already running.
+ */
+enum script_state {
+ s_down,
+ s_up
+};
+
+static enum script_state auth_state = s_down;
+static enum script_state auth_script_state = s_down;
+static pid_t auth_script_pid = 0;
+
+/*
+ * 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 */
+bool explicit_remote = 0; /* User specified explicit remote name */
+char remote_name[MAXNAMELEN]; /* Peer's name for authentication */
+
/* Bits in auth_pending[] */
#define PAP_WITHPEER 1
#define PAP_PEER 2
static void network_phase __P((int));
static void check_idle __P((void *));
static void connect_time_expired __P((void *));
-static int login __P((char *, char *, char **, int *));
-static void logout __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 *,
+static int have_pap_secret __P((int *));
+static int have_chap_secret __P((char *, char *, int, int *));
+static int ip_addr_check __P((u_int32_t, struct permitted_ip *));
+static int scan_authfile __P((FILE *, char *, char *, char *,
struct wordlist **, char *));
static void free_wordlist __P((struct wordlist *));
static void auth_script __P((char *));
+static void auth_script_done __P((void *));
static void set_allowed_addrs __P((int, struct wordlist *));
-#ifdef CBCP_SUPPORT
-static void callback_phase __P((int));
-#endif
+static int some_ip_ok __P((struct wordlist *));
+static int setupapfile __P((char **));
+static int privgroup __P((char **));
+static void check_access __P((FILE *, char *));
+
+/*
+ * 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 PAP 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,
+ &explicit_remote, 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 },
+ { "+ua", o_special, setupapfile,
+ "Get PAP user and password from file" },
+ { "privgroup", o_special, privgroup,
+ "Allow group members to use privileged options", OPT_PRIV },
+ { NULL }
+};
+
+/*
+ * 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 */
+ seteuid(getuid());
+ ufile = fopen(*argv, "r");
+ seteuid(0);
+ if (ufile == NULL) {
+ option_error("unable to open user login data file %s", *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);
+}
+
+
+/*
+ * privgroup - allow members of the group to have privileged access.
+ */
+static int
+privgroup(argv)
+ char **argv;
+{
+ struct group *g;
+ int i;
+
+ g = getgrnam(*argv);
+ if (g == 0) {
+ option_error("group %s is unknown", *argv);
+ return 0;
+ }
+ for (i = 0; i < ngroups; ++i) {
+ if (groups[i] == g->gr_gid) {
+ privileged = 1;
+ break;
+ }
+ }
+ return 1;
+}
+
/*
* An Open on LCP has requested a change from Dead to Establish phase.
if (phase == PHASE_DEAD)
return;
if (logged_in)
- logout();
+ plogout();
phase = PHASE_DEAD;
- syslog(LOG_NOTICE, "Connection terminated.");
+ notice("Connection terminated.");
}
/*
int i;
struct protent *protp;
- if (did_authup) {
+ auth_state = s_down;
+ if (auth_script_state == s_up && auth_script_pid == 0) {
+ auth_script_state = s_down;
auth_script(_PATH_AUTHDOWN);
- did_authup = 0;
}
for (i = 0; (protp = protocols[i]) != NULL; ++i) {
if (!protp->enabled_flag)
* of "" and a password of "". If that's not OK, boot it out.
*/
if (!wo->neg_upap || !null_login(unit)) {
- syslog(LOG_WARNING, "peer refused to authenticate");
+ warn("peer refused to authenticate: terminating link");
lcp_close(unit, "peer refused to authenticate");
return;
}
if (passwd[0] == 0) {
passwd_from_file = 1;
if (!get_pap_passwd(passwd))
- syslog(LOG_ERR, "No secret found for PAP login");
+ error("No secret found for PAP login");
}
upap_authwithpeer(unit, user, passwd);
auth |= PAP_WITHPEER;
/*
* 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;
+ if (go->neg_chap || go->neg_upap) {
+ auth_state = s_up;
+ if (auth_script_state == s_down && auth_script_pid == 0) {
+ auth_script_state = s_up;
+ auth_script(_PATH_AUTHUP);
+ }
}
#ifdef CBCP_SUPPORT
bit = PAP_PEER;
break;
default:
- syslog(LOG_WARNING, "auth_peer_success: unknown protocol %x",
- protocol);
+ warn("auth_peer_success: unknown protocol %x", protocol);
return;
}
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,
bit = PAP_WITHPEER;
break;
default:
- syslog(LOG_WARNING, "auth_peer_success: unknown protocol %x",
- protocol);
+ warn("auth_withpeer_success: unknown protocol %x", protocol);
bit = 0;
}
*/
if (maxconnect > 0)
TIMEOUT(connect_time_expired, 0, maxconnect);
+
+ /*
+ * Detach now, if the updetach option was given.
+ */
+ if (updetach && !nodetach)
+ detach();
}
++num_np_up;
}
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.");
+ 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(arg)
void *arg;
{
- syslog(LOG_INFO, "Connect time expired");
+ info("Connect time expired");
lcp_close(0, "Connect time expired"); /* Close connection */
}
{
lcp_options *wo = &lcp_wantoptions[0];
int can_auth;
- ipcp_options *ipwo = &ipcp_wantoptions[0];
- u_int32_t remote;
+ int lacks_ip;
/* Default our_name to hostname, and user to our_name */
if (our_name[0] == 0 || usehostname)
- strcpy(our_name, hostname);
+ strlcpy(our_name, hostname, sizeof(our_name));
if (user[0] == 0)
- strcpy(user, our_name);
+ strlcpy(user, our_name, sizeof(user));
+
+ /*
+ * If we have a default route, require the peer to authenticate
+ * unless the noauth option was given.
+ */
+ if (!auth_required && !allow_any_ip && have_route_to(0))
+ auth_required = 1;
/* 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 the peer.
*/
- can_auth = wo->neg_upap && (uselogin || have_pap_secret());
+ lacks_ip = 0;
+ can_auth = wo->neg_upap && (uselogin || have_pap_secret(&lacks_ip));
if (!can_auth && wo->neg_chap) {
- remote = ipwo->accept_remote? 0: ipwo->hisaddr;
- can_auth = have_chap_secret(remote_name, our_name, remote);
+ can_auth = have_chap_secret((explicit_remote? remote_name: NULL),
+ our_name, 1, &lacks_ip);
}
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);
+ if (explicit_remote)
+ option_error(
+"The remote system (%s) is required to authenticate itself but I",
+ remote_name);
else
- option_error("for authenticating peer %s to us (%s)\n",
- remote_name, our_name);
- exit(1);
- }
+ option_error(
+"The remote system is required to authenticate itself but I");
- /*
- * Check whether the user tried to override certain values
- * set by root.
- */
- if (!auth_required && auth_req_info.priv > 0) {
- if (!default_device && devnam_info.priv == 0) {
- option_error("can't override device name when noauth option used");
- exit(1);
- }
- if ((connector != NULL && connector_info.priv == 0)
- || (disconnector != NULL && disconnector_info.priv == 0)
- || (welcomer != NULL && welcomer_info.priv == 0)) {
- option_error("can't override connect, disconnect or welcome");
- option_error("option values when noauth option used");
- exit(1);
- }
+ if (!lacks_ip)
+ option_error(
+"couldn't find any suitable secret (password) for it to use to do so.");
+ else
+ option_error(
+"couldn't find any secret (password) which would let it use an IP address.");
+
+ exit(1);
}
}
{
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);
+ && have_chap_secret(user, (explicit_remote? remote_name: NULL),
+ 0, NULL);
- if (go->neg_upap && !uselogin && !have_pap_secret())
+ if (go->neg_upap && !uselogin && !have_pap_secret(NULL))
go->neg_upap = 0;
if (go->neg_chap) {
- remote = ipwo->accept_remote? 0: ipwo->hisaddr;
- if (!have_chap_secret(remote_name, our_name, remote))
+ if (!have_chap_secret((explicit_remote? remote_name: NULL),
+ our_name, 1, NULL))
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;
ret = UPAP_AUTHACK;
f = fopen(filename, "r");
if (f == NULL) {
- syslog(LOG_ERR, "Can't open PAP password file %s: %m", filename);
+ error("Can't open PAP password file %s: %m", filename);
ret = UPAP_AUTHNAK;
} else {
check_access(f, filename);
- remote = ipwo->accept_remote? 0: ipwo->hisaddr;
- if (scan_authfile(f, user, our_name, remote,
- secret, &addrs, filename) < 0
+ if (scan_authfile(f, user, our_name, secret, &addrs, filename) < 0
|| (secret[0] != 0 && (cryptpap || strcmp(passwd, secret) != 0)
&& strcmp(crypt(passwd, secret), secret) != 0)) {
- syslog(LOG_WARNING, "PAP authentication failure for %s", user);
+ warn("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, "PAP login failure for %s", user);
+ warn("PAP login failure for %s", user);
}
}
*msg = "Login incorrect";
*msglen = strlen(*msg);
/*
+ * XXX can we ever get here more than once??
* Frustrate passwd stealer programs.
* Allow 10 tries, but start backing off after 3 (stolen from login).
* On 10'th, drop the connection.
*/
if (attempts++ >= 10) {
- syslog(LOG_WARNING, "%d LOGIN FAILURES ON %s, %s",
- attempts, devnam, user);
- quit();
+ warn("%d LOGIN FAILURES ON %s, %s", attempts, devnam, user);
+ lcp_close(unit, "login failed");
}
if (attempts > 3)
sleep((u_int) (attempts - 3) * 5);
}
/*
- * This function is needed for PAM. However, it should not be called.
- * If it is, return the error code.
+ * This function is needed for PAM.
*/
#ifdef USE_PAM
-static int pam_conv(int num_msg, const struct pam_message **msg,
- struct pam_response **resp, void *appdata_ptr)
+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)
{
- return PAM_CONV_ERR;
+ 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:
*/
static int
-login(user, passwd, msg, msglen)
+plogin(user, passwd, msg, msglen)
char *user;
char *passwd;
char **msg;
int *msglen;
{
- char *tty;
#ifdef USE_PAM
+
struct pam_conv pam_conversation;
pam_handle_t *pamh;
int pam_error;
- char *pass;
- char *dev;
/*
* Fill the pam_conversion structure
*/
pam_conversation.conv = &pam_conv;
pam_error = pam_start ("ppp", user, &pam_conversation, &pamh);
+
if (pam_error != PAM_SUCCESS) {
- *msg = (char *) pam_strerror (pam_error);
+ *msg = MY_PAM_STRERROR (pam_error);
return UPAP_AUTHNAK;
}
/*
* Define the fields for the credintial validation
*/
- (void) pam_set_item (pamh, PAM_AUTHTOK, passwd);
- (void) pam_set_item (pamh, PAM_TTY, devnam);
+ (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)
+ if (pam_error == PAM_SUCCESS) {
pam_error = pam_acct_mgmt (pamh, PAM_SILENT);
- *msg = (char *) pam_strerror (pam_error);
+ /* 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
*/
#else /* #ifdef USE_PAM */
struct passwd *pw;
+ char *tty;
#ifdef HAS_SHADOW
struct spwd *spwd;
struct spwd *getspnam();
- extern int isexpired (struct passwd *, struct spwd *); /* in libshadow.a */
+ long now;
#endif
pw = getpwnam(user);
- if (pw == NULL) {
+ endpwent();
+ if (pw == NULL)
return (UPAP_AUTHNAK);
- }
#ifdef HAS_SHADOW
spwd = getspnam(user);
endspent();
- if (spwd) {
- /* check the age of the password entry */
- if (isexpired(pw, spwd)) {
- syslog(LOG_WARNING,"Expired password for %s",user);
- return (UPAP_AUTHNAK);
- }
- pw->pw_passwd = spwd->sp_pwdp;
+ if (spwd == NULL)
+ return UPAP_AUTHNAK;
+
+ /* check the age of the password entry */
+ 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)) {
+ warn("Password for %s has expired", user);
+ return (UPAP_AUTHNAK);
}
+ pw->pw_passwd = spwd->sp_pwdp;
#endif
/*
|| strcmp(crypt(passwd, pw->pw_passwd), pw->pw_passwd) != 0)
return (UPAP_AUTHNAK);
-#endif /* #ifdef USE_PAM */
-
- 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 = devnam;
if (strncmp(tty, "/dev/", 5) == 0)
tty += 5;
logwtmp(tty, user, remote_name); /* Add wtmp login entry */
- logged_in = TRUE;
+
+#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)strlcpy(ll.ll_line, tty, sizeof(ll.ll_line));
+ (void)write(fd, (char *)&ll, sizeof(ll));
+ (void)close(fd);
+ }
+ }
+#endif
+
+#endif /* #ifdef USE_PAM */
+
+ info("user %s logged in", user);
+ logged_in = 1;
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 = devnam;
if (strncmp(tty, "/dev/", 5) == 0)
tty += 5;
- logwtmp(tty, "", ""); /* Wipe out wtmp logout entry */
- logged_in = FALSE;
+ logwtmp(tty, "", ""); /* Wipe out utmp logout entry */
+#endif
+
+ logged_in = 0;
}
return 0;
check_access(f, filename);
- i = scan_authfile(f, "", our_name, (u_int32_t)0, secret, &addrs, filename);
+ i = scan_authfile(f, "", our_name, secret, &addrs, filename);
ret = i >= 0 && (i & NONWILD_CLIENT) != 0 && secret[0] == 0;
BZERO(secret, sizeof(secret));
* 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.
+ * Assumes passwd points to MAXSECRETLEN bytes of space (if non-null).
*/
static int
get_pap_passwd(passwd)
return 0;
check_access(f, filename);
ret = scan_authfile(f, user,
- remote_name[0]? remote_name: NULL,
- (u_int32_t)0, secret, NULL, filename);
+ (remote_name[0]? remote_name: NULL),
+ secret, NULL, filename);
fclose(f);
if (ret < 0)
return 0;
- if (passwd != NULL) {
- strncpy(passwd, secret, MAXSECRETLEN);
- passwd[MAXSECRETLEN-1] = 0;
- }
+ if (passwd != NULL)
+ strlcpy(passwd, secret, MAXSECRETLEN);
BZERO(secret, sizeof(secret));
return 1;
}
* secrets that we could possibly use for authenticating the peer.
*/
static int
-have_pap_secret()
+have_pap_secret(lacks_ipp)
+ int *lacks_ipp;
{
FILE *f;
int ret;
char *filename;
- ipcp_options *ipwo = &ipcp_wantoptions[0];
- u_int32_t remote;
+ struct wordlist *addrs;
filename = _PATH_UPAPFILE;
f = fopen(filename, "r");
if (f == NULL)
return 0;
- remote = ipwo->accept_remote? 0: ipwo->hisaddr;
- ret = scan_authfile(f, NULL, our_name, remote, NULL, NULL, filename);
+ ret = scan_authfile(f, (explicit_remote? remote_name: NULL), our_name,
+ NULL, &addrs, filename);
fclose(f);
- if (ret < 0)
- return 0;
+ if (ret >= 0 && !some_ip_ok(addrs)) {
+ if (lacks_ipp != 0)
+ *lacks_ipp = 1;
+ ret = -1;
+ }
+ if (addrs != 0)
+ free_wordlist(addrs);
- return 1;
+ return ret >= 0;
}
* know the identity yet.
*/
static int
-have_chap_secret(client, server, remote)
+have_chap_secret(client, server, need_ip, lacks_ipp)
char *client;
char *server;
- u_int32_t remote;
+ int need_ip;
+ int *lacks_ipp;
{
FILE *f;
int ret;
char *filename;
+ struct wordlist *addrs;
filename = _PATH_CHAPFILE;
f = fopen(filename, "r");
if (f == NULL)
return 0;
- if (client[0] == 0)
+ if (client != NULL && client[0] == 0)
client = NULL;
- else if (server[0] == 0)
+ else if (server != NULL && server[0] == 0)
server = NULL;
- ret = scan_authfile(f, client, server, remote, NULL, NULL, filename);
+ ret = scan_authfile(f, client, server, NULL, &addrs, filename);
fclose(f);
- if (ret < 0)
- return 0;
+ if (ret >= 0 && need_ip && !some_ip_ok(addrs)) {
+ if (lacks_ipp != 0)
+ *lacks_ipp = 1;
+ ret = -1;
+ }
+ if (addrs != 0)
+ free_wordlist(addrs);
- return 1;
+ return ret >= 0;
}
f = fopen(filename, "r");
if (f == NULL) {
- syslog(LOG_ERR, "Can't open chap secret file %s: %m", filename);
+ error("Can't open chap secret file %s: %m", filename);
return 0;
}
check_access(f, filename);
- ret = scan_authfile(f, client, server, (u_int32_t)0,
- secbuf, &addrs, filename);
+ ret = scan_authfile(f, client, server, secbuf, &addrs, filename);
fclose(f);
if (ret < 0)
return 0;
len = strlen(secbuf);
if (len > MAXSECRETLEN) {
- syslog(LOG_ERR, "Secret for %s on %s is too long", client, server);
+ error("Secret for %s on %s is too long", client, server);
len = MAXSECRETLEN;
}
BCOPY(secbuf, secret, len);
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 (wo->hisaddr == 0 && *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_int32_t addr;
-{
- 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;
+ int n = 0;
+ struct wordlist *ap;
+ struct permitted_ip *ip;
char *ptr_word, *ptr_mask;
struct hostent *hp;
struct netent *np;
+ u_int32_t a, mask, ah;
+ struct ipcp_options *wo = &ipcp_wantoptions[unit];
+ u_int32_t suggested_ip = 0;
- /* don't allow loopback or multicast address */
- if (bad_ip_adrs(addr))
- return 0;
+ if (addresses[unit] != NULL)
+ free(addresses[unit]);
+ addresses[unit] = NULL;
- if (addrs == NULL)
- return !auth_required; /* no addresses authorized */
+ for (ap = addrs; ap != NULL; ap = ap->next)
+ ++n;
+ if (n == 0)
+ return;
+ ip = (struct permitted_ip *) malloc((n + 1) * sizeof(struct permitted_ip));
+ if (ip == 0)
+ return;
- for (; addrs != NULL; addrs = addrs->next) {
+ n = 0;
+ for (ap = addrs; ap != NULL; ap = ap->next) {
/* "-" means no addresses authorized, "*" means any address allowed */
- ptr_word = addrs->word;
+ ptr_word = ap->word;
if (strcmp(ptr_word, "-") == 0)
break;
- if (strcmp(ptr_word, "*") == 0)
- return 1;
+ if (strcmp(ptr_word, "*") == 0) {
+ ip[n].permit = 1;
+ ip[n].base = ip[n].mask = 0;
+ ++n;
+ break;
+ }
- accept = 1;
+ ip[n].permit = 1;
if (*ptr_word == '!') {
- accept = 0;
+ ip[n].permit = 0;
++ptr_word;
}
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);
+ warn("invalid address length %v in auth. address list",
+ ptr_mask);
continue;
}
*ptr_mask = '\0';
*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;
+ warn("unknown host %s in auth. address list", ap->word);
+ else {
+ ip[n].mask = htonl(mask);
+ ip[n].base = a & ip[n].mask;
+ ++n;
+ if (~mask == 0 && suggested_ip == 0)
+ suggested_ip = a;
+ }
+ }
+
+ ip[n].permit = 0; /* make the last entry forbid all addresses */
+ ip[n].base = 0; /* to terminate the list */
+ ip[n].mask = 0;
+
+ addresses[unit] = ip;
+
+ /*
+ * If the address given for the peer isn't authorized, or if
+ * the user hasn't given one, AND there is an authorized address
+ * which is a single host, then use that if we find one.
+ */
+ if (suggested_ip != 0
+ && (wo->hisaddr == 0 || !auth_ip_addr(unit, wo->hisaddr)))
+ wo->hisaddr = suggested_ip;
+}
+
+/*
+ * 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_int32_t addr;
+{
+ if (addresses[unit] == NULL) {
+ if (auth_required)
+ return 0; /* no addresses authorized */
+ return allow_any_ip || !have_route_to(addr);
}
- return 0; /* not in list => can't have it */
+ return ip_addr_check(addr, addresses[unit]);
+}
+
+static int
+ip_addr_check(addr, addrs)
+ u_int32_t addr;
+ struct permitted_ip *addrs;
+{
+ /* don't allow loopback or multicast address */
+ if (bad_ip_adrs(addr))
+ return 0;
+
+ for (; ; ++addrs)
+ if ((addr & addrs->mask) == addrs->base)
+ return addrs->permit;
}
/*
|| IN_MULTICAST(addr) || IN_BADCLASS(addr);
}
+/*
+ * some_ip_ok - check a wordlist to see if it authorizes any
+ * IP address(es).
+ */
+static int
+some_ip_ok(addrs)
+ struct wordlist *addrs;
+{
+ for (; addrs != 0; addrs = addrs->next) {
+ if (strcmp(addrs->word, "-") == 0)
+ break;
+ if (addrs->word[0] != '!')
+ return 1; /* some IP address is allowed */
+ }
+ return 0;
+}
+
/*
* check_access - complain if a secret file has too-liberal permissions.
*/
-void
+static void
check_access(f, filename)
FILE *f;
char *filename;
struct stat sbuf;
if (fstat(fileno(f), &sbuf) < 0) {
- syslog(LOG_WARNING, "cannot stat secret file %s: %m", filename);
+ warn("cannot stat secret file %s: %m", filename);
} else if ((sbuf.st_mode & (S_IRWXG | S_IRWXO)) != 0) {
- syslog(LOG_WARNING, "Warning - secret file %s has world and/or group access", filename);
+ warn("Warning - secret file %s has world and/or group access",
+ filename);
}
}
* NONWILD_CLIENT set if the secret didn't have "*" for the client, and
* NONWILD_SERVER set if the secret didn't have "*" for the server.
* Any following words on the line (i.e. address authorization
- * info) are placed in a wordlist and returned in *addrs.
+ * info) are placed in a wordlist and returned in *addrs.
+ * We assume secret is NULL or points to MAXWORDLEN bytes of space.
*/
static int
-scan_authfile(f, client, server, ipaddr, secret, addrs, filename)
+scan_authfile(f, client, server, secret, addrs, filename)
FILE *f;
char *client;
char *server;
- u_int32_t ipaddr;
char *secret;
struct wordlist **addrs;
char *filename;
break;
if (newline)
continue;
- if (server != NULL && strcmp(word, server) != 0 && !ISWILD(word))
- continue;
- if (!ISWILD(word))
+ if (!ISWILD(word)) {
+ if (server != NULL && strcmp(word, server) != 0)
+ continue;
got_flag |= NONWILD_SERVER;
+ }
/*
* Got some sort of a match - see if it's better than what
* Special syntax: @filename means read secret from file.
*/
if (word[0] == '@') {
- strcpy(atfile, word+1);
+ strlcpy(atfile, word+1, sizeof(atfile));
if ((sf = fopen(atfile, "r")) == NULL) {
- syslog(LOG_WARNING, "can't open indirect secret file %s",
- atfile);
+ warn("can't open indirect secret file %s", atfile);
continue;
}
check_access(sf, atfile);
if (!getword(sf, word, &xxx, atfile)) {
- syslog(LOG_WARNING, "no secret in indirect secret file %s",
- atfile);
+ warn("no secret in indirect secret file %s", atfile);
fclose(sf);
continue;
}
fclose(sf);
}
if (secret != NULL)
- strcpy(lsecret, word);
+ strlcpy(lsecret, word, sizeof(lsecret));
/*
* Now read address authorization info and make a wordlist.
for (;;) {
if (!getword(f, word, &newline, filename) || newline)
break;
- ap = (struct wordlist *) malloc(sizeof(struct wordlist)
- + strlen(word));
+ ap = (struct wordlist *) malloc(sizeof(struct wordlist));
if (ap == NULL)
novm("authorized addresses");
ap->next = NULL;
- strcpy(ap->word, word);
+ ap->word = strdup(word);
+ if (ap->word == NULL)
+ novm("authorized address");
if (alist == NULL)
alist = ap;
else
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.
*/
free_wordlist(addr_list);
addr_list = alist;
if (secret != NULL)
- strcpy(secret, lsecret);
+ strlcpy(secret, lsecret, MAXWORDLEN);
if (!newline)
break;
}
}
+/*
+ * auth_script_done - called when the auth-up or auth-down script
+ * has finished.
+ */
+static void
+auth_script_done(arg)
+ void *arg;
+{
+ auth_script_pid = 0;
+ switch (auth_script_state) {
+ case s_up:
+ if (auth_state == s_down) {
+ auth_script_state = s_down;
+ auth_script(_PATH_AUTHDOWN);
+ }
+ break;
+ case s_down:
+ if (auth_state == s_up) {
+ auth_script_state = s_up;
+ auth_script(_PATH_AUTHUP);
+ }
+ break;
+ }
+}
+
/*
* auth_script - execute a script with arguments
* interface-name peer-name real-user tty speed
if ((pw = getpwuid(getuid())) != NULL && pw->pw_name != NULL)
user_name = pw->pw_name;
else {
- sprintf(struid, "%d", getuid());
+ slprintf(struid, sizeof(struid), "%d", getuid());
user_name = struid;
}
- sprintf(strspeed, "%d", baud_rate);
+ slprintf(strspeed, sizeof(strspeed), "%d", baud_rate);
argv[0] = script;
argv[1] = ifname;
argv[5] = strspeed;
argv[6] = NULL;
- run_program(script, argv, 0);
+ auth_script_pid = run_program(script, argv, 0, auth_script_done, NULL);
}
projects / ppp.git / blobdiff