289 lines
7.0 KiB
C
289 lines
7.0 KiB
C
/*
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* Copyright (c) 1995-1999 Kungliga Tekniska Högskolan
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* (Royal Institute of Technology, Stockholm, Sweden).
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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RCSID("$Id: verify.c,v 1.20 1999/12/02 16:58:37 joda Exp $");
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#endif
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#include <unistd.h>
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#include <sys/types.h>
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#include <pwd.h>
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#ifdef KRB5
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#include <krb5.h>
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#endif
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#ifdef KRB4
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#include <krb.h>
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#include <kafs.h>
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#endif
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#include <roken.h>
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#ifdef KRB5
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static char krb5ccname[128];
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#endif
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#ifdef KRB4
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static char krbtkfile[128];
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#endif
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/*
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In some cases is afs_gettktstring called twice (once before
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afs_verify and once after afs_verify).
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In some cases (rlogin with access allowed via .rhosts)
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afs_verify is not called!
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So we can't rely on correct value in krbtkfile in some
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cases!
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*/
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static int correct_tkfilename=0;
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static int pag_set=0;
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#ifdef KRB4
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static void
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set_krbtkfile(uid_t uid)
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{
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snprintf (krbtkfile, sizeof(krbtkfile), "%s%d", TKT_ROOT, (unsigned)uid);
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krb_set_tkt_string (krbtkfile);
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correct_tkfilename = 1;
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}
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#endif
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/* XXX this has to be the default cache name, since the KRB5CCNAME
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* environment variable isn't exported by login/xdm
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*/
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#ifdef KRB5
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static void
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set_krb5ccname(uid_t uid)
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{
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snprintf (krb5ccname, sizeof(krb5ccname), "FILE:/tmp/krb5cc_%d", uid);
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#ifdef KRB4
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snprintf (krbtkfile, sizeof(krbtkfile), "%s%d", TKT_ROOT, (unsigned)uid);
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#endif
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correct_tkfilename = 1;
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}
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#endif
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static void
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set_spec_krbtkfile(void)
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{
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int fd;
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#ifdef KRB4
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snprintf (krbtkfile, sizeof(krbtkfile), "%s_XXXXXX", TKT_ROOT);
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fd = mkstemp(krbtkfile);
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close(fd);
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unlink(krbtkfile);
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krb_set_tkt_string (krbtkfile);
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#endif
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#ifdef KRB5
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snprintf(krb5ccname, sizeof(krb5ccname),"FILE:/tmp/krb5cc_XXXXXX");
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fd=mkstemp(krb5ccname+5);
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close(fd);
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unlink(krb5ccname+5);
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#endif
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}
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#ifdef KRB5
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static int
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verify_krb5(struct passwd *pwd,
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char *password,
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int32_t *exp,
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int quiet)
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{
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krb5_context context;
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krb5_error_code ret;
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krb5_ccache ccache;
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krb5_principal principal;
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krb5_init_context(&context);
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ret = krb5_parse_name (context, pwd->pw_name, &principal);
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if (ret) {
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syslog(LOG_AUTH|LOG_DEBUG, "krb5_parse_name: %s",
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krb5_get_err_text(context, ret));
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goto out;
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}
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set_krb5ccname(pwd->pw_uid);
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ret = krb5_cc_resolve(context, krb5ccname, &ccache);
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if(ret) {
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syslog(LOG_AUTH|LOG_DEBUG, "krb5_cc_resolve: %s",
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krb5_get_err_text(context, ret));
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goto out;
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}
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ret = krb5_verify_user_lrealm(context,
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principal,
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ccache,
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password,
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TRUE,
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NULL);
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if(ret) {
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syslog(LOG_AUTH|LOG_DEBUG, "krb5_verify_user: %s",
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krb5_get_err_text(context, ret));
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goto out;
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}
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if(chown(krb5_cc_get_name(context, ccache), pwd->pw_uid, pwd->pw_gid)) {
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syslog(LOG_AUTH|LOG_DEBUG, "chown: %s",
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krb5_get_err_text(context, errno));
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goto out;
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}
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#ifdef KRB4
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if (krb5_config_get_bool(context, NULL,
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"libdefaults",
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"krb4_get_tickets",
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NULL)) {
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CREDENTIALS c;
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krb5_creds mcred, cred;
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krb5_realm realm;
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krb5_get_default_realm(context, &realm);
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krb5_make_principal(context, &mcred.server, realm,
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"krbtgt",
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realm,
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NULL);
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free (realm);
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ret = krb5_cc_retrieve_cred(context, ccache, 0, &mcred, &cred);
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if(ret == 0) {
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ret = krb524_convert_creds_kdc(context, ccache, &cred, &c);
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if(ret)
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krb5_warn(context, ret, "converting creds");
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else {
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set_krbtkfile(pwd->pw_uid);
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tf_setup(&c, c.pname, c.pinst);
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}
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memset(&c, 0, sizeof(c));
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krb5_free_creds_contents(context, &cred);
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} else
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syslog(LOG_AUTH|LOG_DEBUG, "krb5_cc_retrieve_cred: %s",
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krb5_get_err_text(context, ret));
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krb5_free_principal(context, mcred.server);
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}
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if (!pag_set && k_hasafs()) {
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k_setpag();
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pag_set = 1;
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krb5_afslog_uid_home(context, ccache, NULL, NULL,
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pwd->pw_uid, pwd->pw_dir);
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}
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#endif
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out:
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if(ret && !quiet)
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printf ("%s\n", krb5_get_err_text (context, ret));
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return ret;
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}
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#endif
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#ifdef KRB4
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static int
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verify_krb4(struct passwd *pwd,
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char *password,
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int32_t *exp,
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int quiet)
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{
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int ret = 1;
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char lrealm[REALM_SZ];
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if (krb_get_lrealm (lrealm, 1) != KFAILURE) {
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set_krbtkfile(pwd->pw_uid);
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ret = krb_verify_user (pwd->pw_name, "", lrealm, password,
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KRB_VERIFY_SECURE, NULL);
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if (ret == KSUCCESS) {
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if (!pag_set && k_hasafs()) {
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k_setpag ();
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pag_set = 1;
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krb_afslog_uid_home (0, 0, pwd->pw_uid, pwd->pw_dir);
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}
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} else if (!quiet)
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printf ("%s\n", krb_get_err_text (ret));
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}
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return ret;
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}
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#endif
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int
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afs_verify(char *name,
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char *password,
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int32_t *exp,
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int quiet)
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{
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int ret = 1;
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struct passwd *pwd = k_getpwnam (name);
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if(pwd == NULL)
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return 1;
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if (ret)
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ret = unix_verify_user (name, password);
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#ifdef KRB5
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if (ret)
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ret = verify_krb5(pwd, password, exp, quiet);
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#endif
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#ifdef KRB4
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if(ret)
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ret = verify_krb4(pwd, password, exp, quiet);
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#endif
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return ret;
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}
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char *
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afs_gettktstring (void)
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{
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char *ptr;
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struct passwd *pwd;
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if (!correct_tkfilename) {
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ptr = getenv("LOGNAME");
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if (ptr != NULL && ((pwd = getpwnam(ptr)) != NULL)) {
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set_krb5ccname(pwd->pw_uid);
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#ifdef KRB4
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set_krbtkfile(pwd->pw_uid);
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if (!pag_set && k_hasafs()) {
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k_setpag();
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pag_set=1;
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}
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#endif
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} else {
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set_spec_krbtkfile();
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}
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}
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#ifdef KRB5
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setenv("KRB5CCNAME",krb5ccname,1);
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#endif
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#ifdef KRB4
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setenv("KRBTKFILE",krbtkfile,1);
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return krbtkfile;
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#else
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return "";
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#endif
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}
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