crypto/dist/heimdal/lib/auth/afskauthlib/verify.c

   1 /*
   2  * Copyright (c) 1995-2004 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("$Heimdal: verify.c 14203 2004-09-08 09:02:59Z joda $"
  37         "$NetBSD$");
  38 #endif
  39 #include <unistd.h>
  40 #include <sys/types.h>
  41 #include <pwd.h>
  42 #ifdef KRB5
  43 #include <krb5.h>
  44 #endif
  45 #ifdef KRB4
  46 #include <krb.h>
  47 #include <kafs.h>
  48 #endif
  49 #include <roken.h>
  50
  51 #ifdef KRB5
  52 static char krb5ccname[128];
  53 #endif
  54 #ifdef KRB4
  55 static char krbtkfile[128];
  56 #endif
  57
  58 /*
  59    In some cases is afs_gettktstring called twice (once before
  60    afs_verify and once after afs_verify).
  61    In some cases (rlogin with access allowed via .rhosts)
  62    afs_verify is not called!
  63    So we can't rely on correct value in krbtkfile in some
  64    cases!
  65 */
  66
  67 static int correct_tkfilename=0;
  68 static int pag_set=0;
  69
  70 #ifdef KRB4
  71 static void
  72 set_krbtkfile(uid_t uid)
  73 {
  74     snprintf (krbtkfile, sizeof(krbtkfile), "%s%d", TKT_ROOT, (unsigned)uid);
  75     krb_set_tkt_string (krbtkfile);
  76     correct_tkfilename = 1;
  77 }
  78 #endif
  79
  80 /* XXX this has to be the default cache name, since the KRB5CCNAME
  81  * environment variable isn't exported by login/xdm
  82  */
  83
  84 #ifdef KRB5
  85 static void
  86 set_krb5ccname(uid_t uid)
  87 {
  88     snprintf (krb5ccname, sizeof(krb5ccname), "FILE:/tmp/krb5cc_%d", uid);
  89 #ifdef KRB4
  90     snprintf (krbtkfile, sizeof(krbtkfile), "%s%d", TKT_ROOT, (unsigned)uid);
  91 #endif
  92     correct_tkfilename = 1;
  93 }
  94 #endif
  95
  96 static void
  97 set_spec_krbtkfile(void)
  98 {
  99     int fd;
 100 #ifdef KRB4
 101     snprintf (krbtkfile, sizeof(krbtkfile), "%s_XXXXXX", TKT_ROOT);
 102     fd = mkstemp(krbtkfile);
 103     close(fd);
 104     unlink(krbtkfile);
 105     krb_set_tkt_string (krbtkfile);
 106 #endif
 107 #ifdef KRB5
 108     snprintf(krb5ccname, sizeof(krb5ccname),"FILE:/tmp/krb5cc_XXXXXX");
 109     fd=mkstemp(krb5ccname+5);
 110     close(fd);
 111     unlink(krb5ccname+5);
 112 #endif
 113 }
 114
 115 #ifdef KRB5
 116 static int
 117 verify_krb5(struct passwd *pwd,
 118             char *password,
 119             int32_t *exp,
 120             int quiet)
 121 {
 122     krb5_context context;
 123     krb5_error_code ret;
 124     krb5_ccache ccache;
 125     krb5_principal principal;
 126
 127     ret = krb5_init_context(&context);
 128     if (ret) {
 129         syslog(LOG_AUTH|LOG_DEBUG, "krb5_init_context failed: %d", ret);
 130         goto out;
 131     }
 132
 133     ret = krb5_parse_name (context, pwd->pw_name, &principal);
 134     if (ret) {
 135         syslog(LOG_AUTH|LOG_DEBUG, "krb5_parse_name: %s",
 136                krb5_get_err_text(context, ret));
 137         goto out;
 138     }
 139
 140     set_krb5ccname(pwd->pw_uid);
 141     ret = krb5_cc_resolve(context, krb5ccname, &ccache);
 142     if(ret) {
 143         syslog(LOG_AUTH|LOG_DEBUG, "krb5_cc_resolve: %s",
 144                krb5_get_err_text(context, ret));
 145         goto out;
 146     }
 147
 148     ret = krb5_verify_user_lrealm(context,
 149                                   principal,
 150                                   ccache,
 151                                   password,
 152                                   TRUE,
 153                                   NULL);
 154     if(ret) {
 155         syslog(LOG_AUTH|LOG_DEBUG, "krb5_verify_user: %s",
 156                krb5_get_err_text(context, ret));
 157         goto out;
 158     }
 159
 160     if(chown(krb5_cc_get_name(context, ccache), pwd->pw_uid, pwd->pw_gid)) {
 161         syslog(LOG_AUTH|LOG_DEBUG, "chown: %s",
 162                krb5_get_err_text(context, errno));
 163         goto out;
 164     }
 165
 166 #ifdef KRB4
 167     {
 168         krb5_realm realm = NULL;
 169         krb5_boolean get_v4_tgt;
 170
 171         krb5_get_default_realm(context, &realm);
 172         krb5_appdefault_boolean(context, "afskauthlib",
 173                                 realm,
 174                                 "krb4_get_tickets", FALSE, &get_v4_tgt);
 175         if (get_v4_tgt) {
 176             CREDENTIALS c;
 177             krb5_creds mcred, cred;
 178
 179             krb5_cc_clear_mcred(&mcred);
 180
 181             krb5_make_principal(context, &mcred.server, realm,
 182                                 "krbtgt",
 183                                 realm,
 184                                 NULL);
 185             ret = krb5_cc_retrieve_cred(context, ccache, 0, &mcred, &cred);
 186             if(ret == 0) {
 187                 ret = krb524_convert_creds_kdc_ccache(context, ccache, &cred, &c);
 188                 if(ret)
 189                     krb5_warn(context, ret, "converting creds");
 190                 else {
 191                     set_krbtkfile(pwd->pw_uid);
 192                     tf_setup(&c, c.pname, c.pinst);
 193                 }
 194                 memset(&c, 0, sizeof(c));
 195                 krb5_free_cred_contents(context, &cred);
 196             } else
 197                 syslog(LOG_AUTH|LOG_DEBUG, "krb5_cc_retrieve_cred: %s",
 198                        krb5_get_err_text(context, ret));
 199
 200             krb5_free_principal(context, mcred.server);
 201         }
 202         free (realm);
 203         if (!pag_set && k_hasafs()) {
 204             k_setpag();
 205             pag_set = 1;
 206         }
 207
 208         if (pag_set)
 209             krb5_afslog_uid_home(context, ccache, NULL, NULL,
 210                                  pwd->pw_uid, pwd->pw_dir);
 211     }
 212 #endif
 213  out:
 214     if(ret && !quiet)
 215         printf ("%s\n", krb5_get_err_text (context, ret));
 216     return ret;
 217 }
 218 #endif
 219
 220 #ifdef KRB4
 221 static int
 222 verify_krb4(struct passwd *pwd,
 223             char *password,
 224             int32_t *exp,
 225             int quiet)
 226 {
 227     int ret = 1;
 228     char lrealm[REALM_SZ];
 229
 230     if (krb_get_lrealm (lrealm, 1) != KFAILURE) {
 231         set_krbtkfile(pwd->pw_uid);
 232         ret = krb_verify_user (pwd->pw_name, "", lrealm, password,
 233                                KRB_VERIFY_SECURE, NULL);
 234         if (ret == KSUCCESS) {
 235             if (!pag_set && k_hasafs()) {
 236                 k_setpag ();
 237                 pag_set = 1;
 238             }
 239             if (pag_set)
 240                 krb_afslog_uid_home (0, 0, pwd->pw_uid, pwd->pw_dir);
 241         } else if (!quiet)
 242             printf ("%s\n", krb_get_err_text (ret));
 243     }
 244     return ret;
 245 }
 246 #endif
 247
 248 int
 249 afs_verify(char *name,
 250            char *password,
 251            int32_t *exp,
 252            int quiet)
 253 {
 254     int ret = 1;
 255     struct passwd *pwd = k_getpwnam (name);
 256
 257     if(pwd == NULL)
 258         return 1;
 259
 260     if (!pag_set && k_hasafs()) {
 261         k_setpag();
 262         pag_set=1;
 263     }
 264
 265     if (ret)
 266         ret = unix_verify_user (name, password);
 267 #ifdef KRB5
 268     if (ret)
 269         ret = verify_krb5(pwd, password, exp, quiet);
 270 #endif
 271 #ifdef KRB4
 272     if(ret)
 273         ret = verify_krb4(pwd, password, exp, quiet);
 274 #endif
 275     return ret;
 276 }
 277
 278 char *
 279 afs_gettktstring (void)
 280 {
 281     char *ptr;
 282     struct passwd *pwd;
 283
 284     if (!correct_tkfilename) {
 285         ptr = getenv("LOGNAME");
 286         if (ptr != NULL && ((pwd = getpwnam(ptr)) != NULL)) {
 287             set_krb5ccname(pwd->pw_uid);
 288 #ifdef KRB4
 289             set_krbtkfile(pwd->pw_uid);
 290             if (!pag_set && k_hasafs()) {
 291                 k_setpag();
 292                 pag_set=1;
 293             }
 294 #endif
 295         } else {
 296             set_spec_krbtkfile();
 297         }
 298     }
 299 #ifdef KRB5
 300     esetenv("KRB5CCNAME",krb5ccname,1);
 301 #endif
 302 #ifdef KRB4
 303     esetenv("KRBTKFILE",krbtkfile,1);
 304     return krbtkfile;
 305 #else
 306     return "";
 307 #endif
 308 }