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Make lock(1) use PAM. This makes the -p option work again. (Well, kind of,

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because the whole idea of this utility is rather broken.)

This originally come from NetBSD, and was later reworked a bit.

Reviewed by:	des@ (earlier version)
MFC after:	2 weeks
Differential Revision:	https://reviews.freebsd.org/D4981
This commit is contained in:
Edward Tomasz Napierala 2018-02-11 13:35:31 +00:00
parent b42712a8b7
commit 11db7fa42b
2 changed files with 38 additions and 17 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
usr.bin/lock/Makefile
View File

@ -5,6 +5,6 @@ PROG= lock
BINOWN= root
BINMODE=4555
LIBADD= crypt
LIBADD= pam
.include <bsd.prog.mk>

53
usr.bin/lock/lock.c
View File

@ -73,6 +73,9 @@ __FBSDID("$FreeBSD$");
#include <time.h>
#include <unistd.h>
#include <security/pam_appl.h>
#include <security/openpam.h> /* for openpam_ttyconv() */
#define TIMEOUT 15
static void quit(int);
@ -91,19 +94,23 @@ static int vtyunlock; /* Unlock flag and code. */
int
main(int argc, char **argv)
{
static const struct pam_conv pamc = { &openpam_ttyconv, NULL };
pam_handle_t *pamh;
struct passwd *pw;
struct itimerval ntimer, otimer;
struct tm *timp;
time_t timval;
int ch, failures, sectimeout, usemine, vtylock;
char *ap, *cryptpw, *mypw, *ttynam, *tzn;
int ch, failures, pam_err, sectimeout, usemine, vtylock;
char *ap, *ttynam, *tzn;
char hostname[MAXHOSTNAMELEN], s[BUFSIZ], s1[BUFSIZ];
openlog("lock", 0, LOG_AUTH);
pam_err = PAM_SYSTEM_ERR; /* pacify GCC */
sectimeout = TIMEOUT;
pamh = NULL;
pw = NULL;
mypw = NULL;
usemine = 0;
no_timeout = 0;
vtylock = 0;
@ -117,7 +124,6 @@ main(int argc, char **argv)
usemine = 1;
if (!(pw = getpwuid(getuid())))
errx(1, "unknown uid %d", getuid());
mypw = strdup(pw->pw_passwd);
break;
case 'n':
no_timeout = 1;
@ -131,9 +137,11 @@ main(int argc, char **argv)
}
timeout.tv_sec = sectimeout * 60;
/* discard privs */
if (setuid(getuid()) != 0)
errx(1, "setuid failed");
if (!usemine) { /* -p with PAM or S/key needs privs */
/* discard privs */
if (setuid(getuid()) != 0)
errx(1, "setuid failed");
}
if (tcgetattr(0, &tty)) /* get information for header */
exit(1);
@ -153,7 +161,11 @@ main(int argc, char **argv)
ntty = tty; ntty.c_lflag &= ~ECHO;
(void)tcsetattr(0, TCSADRAIN|TCSASOFT, &ntty);
if (!mypw) {
if (usemine) {
pam_err = pam_start("lock", pw->pw_name, &pamc, &pamh);
if (pam_err != PAM_SUCCESS)
err(1, "pam_start: %s", pam_strerror(NULL, pam_err));
} else {
/* get key and check again */
(void)printf("Key: ");
if (!fgets(s, sizeof(s), stdin) || *s == '\n')
@ -171,7 +183,6 @@ main(int argc, char **argv)
exit(1);
}
s[0] = '\0';
mypw = s1;
}
/* set signal handlers */
@ -216,19 +227,27 @@ main(int argc, char **argv)
failures = 0;
for (;;) {
if (usemine) {
pam_err = pam_authenticate(pamh, 0);
if (pam_err == PAM_SUCCESS)
break;
if (pam_err != PAM_AUTH_ERR &&
pam_err != PAM_USER_UNKNOWN &&
pam_err != PAM_MAXTRIES) {
syslog(LOG_ERR, "pam_authenticate: %s",
pam_strerror(pamh, pam_err));
}
goto tryagain;
}
(void)printf("Key: ");
if (!fgets(s, sizeof(s), stdin)) {
clearerr(stdin);
hi(0);
goto tryagain;
}
if (usemine) {
s[strlen(s) - 1] = '\0';
cryptpw = crypt(s, mypw);
if (cryptpw != NULL && !strcmp(mypw, cryptpw))
break;
}
else if (!strcmp(s, s1))
if (!strcmp(s, s1))
break;
(void)printf("\07\n");
failures++;
@ -243,6 +262,8 @@ main(int argc, char **argv)
if (getuid() == 0)
syslog(LOG_NOTICE, "ROOT UNLOCK ON hostname %s port %s",
hostname, ttynam);
if (usemine)
(void)pam_end(pamh, pam_err);
quit(0);
return(0); /* not reached */
}