crypto/heimdal-0.6.3/lib/auth/afskauthlib/verify.c

   1 /*
   2  * Copyright (c) 1995-2000, 2004 Kungliga Tekniska Högskolan
   3  * (Royal Institute of Technology, Stockholm, Sweden).
   4  * All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  *
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  *
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  *
  17  * 3. Neither the name of the Institute nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  */
  33
  34 #ifdef HAVE_CONFIG_H
  35 #include <config.h>
  36 RCSID("$Id: verify.c,v 1.25.12.1 2004/09/08 09:14:26 joda Exp $");
  37 #endif
  38 #include <unistd.h>
  39 #include <sys/types.h>
  40 #include <pwd.h>
  41 #ifdef KRB5
  42 #include <krb5.h>
  43 #endif
  44 #ifdef KRB4
  45 #include <krb.h>
  46 #include <kafs.h>
  47 #endif
  48 #include <roken.h>
  49
  50 #ifdef KRB5
  51 static char krb5ccname[128];
  52 #endif
  53 #ifdef KRB4
  54 static char krbtkfile[128];
  55 #endif
  56
  57 /*
  58    In some cases is afs_gettktstring called twice (once before
  59    afs_verify and once after afs_verify).
  60    In some cases (rlogin with access allowed via .rhosts)
  61    afs_verify is not called!
  62    So we can't rely on correct value in krbtkfile in some
  63    cases!
  64 */
  65
  66 static int correct_tkfilename=0;
  67 static int pag_set=0;
  68
  69 #ifdef KRB4
  70 static void
  71 set_krbtkfile(uid_t uid)
  72 {
  73     snprintf (krbtkfile, sizeof(krbtkfile), "%s%d", TKT_ROOT, (unsigned)uid);
  74     krb_set_tkt_string (krbtkfile);
  75     correct_tkfilename = 1;
  76 }
  77 #endif
  78
  79 /* XXX this has to be the default cache name, since the KRB5CCNAME
  80  * environment variable isn't exported by login/xdm
  81  */
  82
  83 #ifdef KRB5
  84 static void
  85 set_krb5ccname(uid_t uid)
  86 {
  87     snprintf (krb5ccname, sizeof(krb5ccname), "FILE:/tmp/krb5cc_%d", uid);
  88 #ifdef KRB4
  89     snprintf (krbtkfile, sizeof(krbtkfile), "%s%d", TKT_ROOT, (unsigned)uid);
  90 #endif
  91     correct_tkfilename = 1;
  92 }
  93 #endif
  94
  95 static void
  96 set_spec_krbtkfile(void)
  97 {
  98     int fd;
  99 #ifdef KRB4
 100     snprintf (krbtkfile, sizeof(krbtkfile), "%s_XXXXXX", TKT_ROOT);
 101     fd = mkstemp(krbtkfile);
 102     close(fd);
 103     unlink(krbtkfile);
 104     krb_set_tkt_string (krbtkfile);
 105 #endif
 106 #ifdef KRB5
 107     snprintf(krb5ccname, sizeof(krb5ccname),"FILE:/tmp/krb5cc_XXXXXX");
 108     fd=mkstemp(krb5ccname+5);
 109     close(fd);
 110     unlink(krb5ccname+5);
 111 #endif
 112 }
 113
 114 #ifdef KRB5
 115 static int
 116 verify_krb5(struct passwd *pwd,
 117             char *password,
 118             int32_t *exp,
 119             int quiet)
 120 {
 121     krb5_context context;
 122     krb5_error_code ret;
 123     krb5_ccache ccache;
 124     krb5_principal principal;
 125
 126     ret = krb5_init_context(&context);
 127     if (ret) {
 128         syslog(LOG_AUTH|LOG_DEBUG, "krb5_init_context failed: %d", ret);
 129         goto out;
 130     }
 131
 132     ret = krb5_parse_name (context, pwd->pw_name, &principal);
 133     if (ret) {
 134         syslog(LOG_AUTH|LOG_DEBUG, "krb5_parse_name: %s",
 135                krb5_get_err_text(context, ret));
 136         goto out;
 137     }
 138
 139     set_krb5ccname(pwd->pw_uid);
 140     ret = krb5_cc_resolve(context, krb5ccname, &ccache);
 141     if(ret) {
 142         syslog(LOG_AUTH|LOG_DEBUG, "krb5_cc_resolve: %s",
 143                krb5_get_err_text(context, ret));
 144         goto out;
 145     }
 146
 147     ret = krb5_verify_user_lrealm(context,
 148                                   principal,
 149                                   ccache,
 150                                   password,
 151                                   TRUE,
 152                                   NULL);
 153     if(ret) {
 154         syslog(LOG_AUTH|LOG_DEBUG, "krb5_verify_user: %s",
 155                krb5_get_err_text(context, ret));
 156         goto out;
 157     }
 158
 159     if(chown(krb5_cc_get_name(context, ccache), pwd->pw_uid, pwd->pw_gid)) {
 160         syslog(LOG_AUTH|LOG_DEBUG, "chown: %s",
 161                krb5_get_err_text(context, errno));
 162         goto out;
 163     }
 164
 165 #ifdef KRB4
 166     {
 167         krb5_realm realm = NULL;
 168         krb5_boolean get_v4_tgt;
 169
 170         krb5_get_default_realm(context, &realm);
 171         krb5_appdefault_boolean(context, "afskauthlib",
 172                                 realm,
 173                                 "krb4_get_tickets", FALSE, &get_v4_tgt);
 174         if (get_v4_tgt) {
 175             CREDENTIALS c;
 176             krb5_creds mcred, cred;
 177
 178             krb5_make_principal(context, &mcred.server, realm,
 179                                 "krbtgt",
 180                                 realm,
 181                                 NULL);
 182             ret = krb5_cc_retrieve_cred(context, ccache, 0, &mcred, &cred);
 183             if(ret == 0) {
 184                 ret = krb524_convert_creds_kdc_ccache(context, ccache, &cred, &c);
 185                 if(ret)
 186                     krb5_warn(context, ret, "converting creds");
 187                 else {
 188                     set_krbtkfile(pwd->pw_uid);
 189                     tf_setup(&c, c.pname, c.pinst);
 190                 }
 191                 memset(&c, 0, sizeof(c));
 192                 krb5_free_creds_contents(context, &cred);
 193             } else
 194                 syslog(LOG_AUTH|LOG_DEBUG, "krb5_cc_retrieve_cred: %s",
 195                        krb5_get_err_text(context, ret));
 196
 197             krb5_free_principal(context, mcred.server);
 198         }
 199         free(realm);
 200         if (!pag_set && k_hasafs()) {
 201             k_setpag();
 202             pag_set = 1;
 203         }
 204
 205         if (pag_set)
 206             krb5_afslog_uid_home(context, ccache, NULL, NULL,
 207                                  pwd->pw_uid, pwd->pw_dir);
 208     }
 209 #endif
 210  out:
 211     if(ret && !quiet)
 212         printf ("%s\n", krb5_get_err_text (context, ret));
 213     return ret;
 214 }
 215 #endif
 216
 217 #ifdef KRB4
 218 static int
 219 verify_krb4(struct passwd *pwd,
 220             char *password,
 221             int32_t *exp,
 222             int quiet)
 223 {
 224     int ret = 1;
 225     char lrealm[REALM_SZ];
 226
 227     if (krb_get_lrealm (lrealm, 1) != KFAILURE) {
 228         set_krbtkfile(pwd->pw_uid);
 229         ret = krb_verify_user (pwd->pw_name, "", lrealm, password,
 230                                KRB_VERIFY_SECURE, NULL);
 231         if (ret == KSUCCESS) {
 232             if (!pag_set && k_hasafs()) {
 233                 k_setpag ();
 234                 pag_set = 1;
 235             }
 236             if (pag_set)
 237                 krb_afslog_uid_home (0, 0, pwd->pw_uid, pwd->pw_dir);
 238         } else if (!quiet)
 239             printf ("%s\n", krb_get_err_text (ret));
 240     }
 241     return ret;
 242 }
 243 #endif
 244
 245 int
 246 afs_verify(char *name,
 247            char *password,
 248            int32_t *exp,
 249            int quiet)
 250 {
 251     int ret = 1;
 252     struct passwd *pwd = k_getpwnam (name);
 253
 254     if(pwd == NULL)
 255         return 1;
 256
 257     if (!pag_set && k_hasafs()) {
 258         k_setpag();
 259         pag_set=1;
 260     }
 261
 262     if (ret)
 263         ret = unix_verify_user (name, password);
 264 #ifdef KRB5
 265     if (ret)
 266         ret = verify_krb5(pwd, password, exp, quiet);
 267 #endif
 268 #ifdef KRB4
 269     if(ret)
 270         ret = verify_krb4(pwd, password, exp, quiet);
 271 #endif
 272     return ret;
 273 }
 274
 275 char *
 276 afs_gettktstring (void)
 277 {
 278     char *ptr;
 279     struct passwd *pwd;
 280
 281     if (!correct_tkfilename) {
 282         ptr = getenv("LOGNAME");
 283         if (ptr != NULL && ((pwd = getpwnam(ptr)) != NULL)) {
 284             set_krb5ccname(pwd->pw_uid);
 285 #ifdef KRB4
 286             set_krbtkfile(pwd->pw_uid);
 287             if (!pag_set && k_hasafs()) {
 288                 k_setpag();
 289                 pag_set=1;
 290             }
 291 #endif
 292         } else {
 293             set_spec_krbtkfile();
 294         }
 295     }
 296 #ifdef KRB5
 297     esetenv("KRB5CCNAME",krb5ccname,1);
 298 #endif
 299 #ifdef KRB4
 300     esetenv("KRBTKFILE",krbtkfile,1);
 301     return krbtkfile;
 302 #else
 303     return "";
 304 #endif
 305 }