Better integrate kerberos into su so that if an incorrect Kerberos
password is entered, the user is not prompted for a password a second time. This closes pr-bin/1006.
This commit is contained in:
Mark Murray
parent
0a2c4bde08
commit
5a453b0ef3
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=14440
@ -7,6 +7,7 @@ COPTS+= -DSKEY
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.if defined(WHEELSU)
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COPTS+= -DWHEELSU
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.endif
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CFLAGS+= -Wall
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LDADD= -lskey -lmd -lcrypt
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DPADD= ${LIBSKEY} ${LIBMD} ${LIBCRYPT}
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@ -32,13 +32,17 @@
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*/
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#ifndef lint
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static char copyright[] =
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static const char copyright[] =
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"@(#) Copyright (c) 1988, 1993, 1994\n\
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The Regents of the University of California. All rights reserved.\n";
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#endif /* not lint */
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#ifndef lint
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/*
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static char sccsid[] = "@(#)su.c 8.3 (Berkeley) 4/2/94";
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*/
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static const char rcsid[] =
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"$Id$";
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#endif /* not lint */
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#include <sys/param.h>
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@ -67,6 +71,9 @@ static char sccsid[] = "@(#)su.c 8.3 (Berkeley) 4/2/94";
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#define ARGSTR "-Kflm"
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static int kerberos(char *username, char *user, int uid, char *pword);
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static int koktologin(char *name, char *toname);
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int use_kerberos = 1;
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#else
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#define ARGSTR "-flm"
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@ -178,23 +185,27 @@ main(argc, argv)
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if (ruid) {
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#ifdef KERBEROS
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if (!use_kerberos || kerberos(username, user, pwd->pw_uid))
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if (use_kerberos && koktologin(username, user)
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&& !pwd->pw_uid)
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errx(1, "kerberos: not in %s's ACL.", user);
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else
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#endif
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{
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/* only allow those in group zero to su to root. */
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if (pwd->pw_uid == 0 && (gr = getgrgid((gid_t)0)))
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for (g = gr->gr_mem;; ++g) {
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if (!*g)
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errx(1,
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{
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/* only allow those in group zero to su to root. */
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if (pwd->pw_uid == 0 && (gr = getgrgid((gid_t)0)))
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for (g = gr->gr_mem;; ++g) {
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if (!*g)
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errx(1,
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"you are not in the correct group to su %s.",
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user);
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if (strcmp(username, *g) == 0) {
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user);
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if (strcmp(username, *g) == 0) {
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#ifdef WHEELSU
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iswheelsu = 1;
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iswheelsu = 1;
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#endif /* WHEELSU */
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break;
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break;
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}
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}
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}
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}
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/* if target requires a password, verify it */
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if (*pwd->pw_passwd) {
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#ifdef SKEY
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@ -216,11 +227,18 @@ main(argc, argv)
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p = getpass("Password:");
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if (strcmp(pwd->pw_passwd, crypt(p, pwd->pw_passwd))) {
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#endif
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fprintf(stderr, "Sorry\n");
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syslog(LOG_AUTH|LOG_WARNING,
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"BAD SU %s to %s%s", username,
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user, ontty());
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exit(1);
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#ifdef KERBEROS
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if (use_kerberos &&
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kerberos(username, user, pwd->pw_uid, p)
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)
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#endif
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{
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fprintf(stderr, "Sorry\n");
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syslog(LOG_AUTH|LOG_WARNING,
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"BAD SU %s to %s%s", username,
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user, ontty());
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exit(1);
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}
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}
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#ifdef WHEELSU
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if (iswheelsu) {
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@ -235,7 +253,6 @@ main(argc, argv)
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user, ontty());
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exit(1);
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}
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}
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}
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if (asme) {
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@ -252,7 +269,8 @@ main(argc, argv)
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/* if we're forking a csh, we want to slightly muck the args */
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if (iscsh == UNSET) {
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if (p = strrchr(shell, '/'))
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p = strrchr(shell, '/');
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if (p)
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++p;
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else
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p = shell;
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@ -323,21 +341,22 @@ ontty()
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static char buf[MAXPATHLEN + 4];
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buf[0] = 0;
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if (p = ttyname(STDERR_FILENO))
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p = ttyname(STDERR_FILENO);
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if (p)
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snprintf(buf, sizeof(buf), " on %s", p);
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return (buf);
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}
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#ifdef KERBEROS
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kerberos(username, user, uid)
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int
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kerberos(username, user, uid, pword)
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char *username, *user;
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int uid;
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char *pword;
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{
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extern char *krb_err_txt[];
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KTEXT_ST ticket;
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AUTH_DAT authdata;
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struct hostent *hp;
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char *p;
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int kerno;
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u_long faddr;
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struct sockaddr_in local_addr;
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@ -347,11 +366,8 @@ kerberos(username, user, uid)
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if (krb_get_lrealm(lrealm, 1) != KSUCCESS)
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return (1);
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if (koktologin(username, lrealm, user) && !uid) {
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warnx("kerberos: not in %s's ACL.", user);
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return (1);
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}
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(void)sprintf(krbtkfile, "%s_%s_%d", TKT_ROOT, user, getuid());
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(void)sprintf(krbtkfile, "%s_%s_%lu", TKT_ROOT, user,
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(unsigned long)getuid());
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(void)setenv("KRBTKFILE", krbtkfile, 1);
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(void)krb_set_tkt_string(krbtkfile);
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@ -376,7 +392,7 @@ kerberos(username, user, uid)
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*/
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kerno = krb_get_pw_in_tkt((uid == 0 ? username : user),
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(uid == 0 ? "root" : ""), lrealm,
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"krbtgt", lrealm, DEFAULT_TKT_LIFE, 0);
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"krbtgt", lrealm, DEFAULT_TKT_LIFE, pword);
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if (kerno != KSUCCESS) {
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if (kerno == KDC_PR_UNKNOWN) {
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@ -445,12 +461,16 @@ kerberos(username, user, uid)
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return (0);
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}
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koktologin(name, realm, toname)
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char *name, *realm, *toname;
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int
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koktologin(name, toname)
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char *name, *toname;
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{
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AUTH_DAT *kdata;
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AUTH_DAT kdata_st;
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char realm[REALM_SZ];
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if (krb_get_lrealm(realm, 1) != KSUCCESS)
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return (1);
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kdata = &kdata_st;
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memset((char *)kdata, 0, sizeof(*kdata));
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(void)strcpy(kdata->pname, name);
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