*/
#ifndef lint
-static char rcsid[] = "$Id: auth.c,v 1.41 1999/02/26 10:38:50 paulus Exp $";
+static char rcsid[] = "$Id: auth.c,v 1.45 1999/03/12 06:07:14 paulus Exp $";
#endif
#include <stdio.h>
#include <unistd.h>
#include <syslog.h>
#include <pwd.h>
+#include <grp.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
/* 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 */
static void free_wordlist __P((struct wordlist *));
static void auth_script __P((char *));
static void set_allowed_addrs __P((int, struct wordlist *));
-static int setupapfile __P((char **));
+static int setupapfile __P((char **));
+static int privgroup __P((char **));
/*
* Authentication-related options.
"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 }
};
lcp_allowoptions[0].neg_upap = 1;
/* open user info file */
- if ((ufile = fopen(*argv, "r")) == NULL) {
+ seteuid(getuid());
+ ufile = fopen(*argv, "r");
+ seteuid(0);
+ if (ufile == NULL) {
option_error("unable to open user login data file %s", *argv);
return 0;
}
+#if 0 /* check done by setting effective UID above */
if (!readable(fileno(ufile))) {
option_error("%s: access denied", *argv);
return 0;
}
+#endif
check_access(ufile, *argv);
/* get username */
}
+/*
+ * 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.
* Do what's necessary to bring the physical layer up.
/* Default our_name to hostname, and user to our_name */
if (our_name[0] == 0 || usehostname)
- strcpy(our_name, hostname);
+ strlcpy(our_name, sizeof(our_name), hostname);
if (user[0] == 0)
- strcpy(user, our_name);
+ strlcpy(user, sizeof(user), our_name);
/* If authentication is required, ask peer for CHAP or PAP. */
if (auth_required) {
wo->neg_upap = 0;
}
+ /*
+ * 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;
+
/*
* Check whether we have appropriate secrets to use
* to authenticate the peer.
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);
- }
- }
}
/*
(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)strlcpy(ll.ll_line, sizeof(ll.ll_line), tty);
(void)write(fd, (char *)&ll, sizeof(ll));
(void)close(fd);
}
* 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)
fclose(f);
if (ret < 0)
return 0;
- if (passwd != NULL) {
- strncpy(passwd, secret, MAXSECRETLEN);
- passwd[MAXSECRETLEN-1] = 0;
- }
+ if (passwd != NULL)
+ strlcpy(passwd, MAXSECRETLEN, secret);
BZERO(secret, sizeof(secret));
return 1;
}
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 ip_addr_check(addr, addresses[unit]);
}
if (bad_ip_adrs(addr))
return 0;
- if (addrs == NULL) {
- if (auth_required)
- return 0; /* no addresses authorized */
- return allow_any_ip || !have_route_to(addr);
- }
+ if (addrs == NULL)
+ return 0; /* no addresses authorized */
for (; addrs != NULL; addrs = addrs->next) {
/* "-" means no addresses authorized, "*" means any address allowed */
* 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)
* Special syntax: @filename means read secret from file.
*/
if (word[0] == '@') {
- strcpy(atfile, word+1);
+ strlcpy(atfile, sizeof(atfile), word+1);
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, sizeof(lsecret), word);
/*
* 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
free_wordlist(addr_list);
addr_list = alist;
if (secret != NULL)
- strcpy(secret, lsecret);
+ strlcpy(secret, MAXWORDLEN, lsecret);
if (!newline)
break;
projects / ppp.git / blobdiff