kdc/hpropd.c

   1 /*
   2  * Copyright (c) 1997-2006 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 #include "hprop.h"
  35
  36 static int inetd_flag = -1;
  37 static int help_flag;
  38 static int version_flag;
  39 static int print_dump;
  40 static const char *database;
  41 static int from_stdin;
  42 static char *local_realm;
  43 static char *ktname = NULL;
  44
  45 struct getargs args[] = {
  46     { "database", 'd', arg_string, rk_UNCONST(&database), "database", "file" },
  47     { "stdin",    'n', arg_flag, &from_stdin, "read from stdin", NULL },
  48     { "print",      0, arg_flag, &print_dump, "print dump to stdout", NULL },
  49 #ifdef SUPPORT_INETD
  50     { "inetd",     'i', arg_negative_flag,      &inetd_flag,
  51       "Not started from inetd", NULL },
  52 #endif
  53     { "keytab",   'k',  arg_string, &ktname,    "keytab to use for authentication", "keytab" },
  54     { "realm",   'r',   arg_string, &local_realm, "realm to use", NULL },
  55     { "version",    0, arg_flag, &version_flag, NULL, NULL },
  56     { "help",    'h',  arg_flag, &help_flag, NULL, NULL}
  57 };
  58
  59 static int num_args = sizeof(args) / sizeof(args[0]);
  60 static char unparseable_name[] = "unparseable name";
  61
  62 static void
  63 usage(int ret)
  64 {
  65     arg_printusage (args, num_args, NULL, "");
  66     exit (ret);
  67 }
  68
  69 int
  70 main(int argc, char **argv)
  71 {
  72     krb5_error_code ret;
  73     krb5_context context;
  74     krb5_auth_context ac = NULL;
  75     krb5_principal c1, c2;
  76     krb5_authenticator authent;
  77     krb5_keytab keytab;
  78     krb5_socket_t sock = rk_INVALID_SOCKET;
  79     HDB *db = NULL;
  80     int optidx = 0;
  81     char *tmp_db = NULL;
  82     krb5_log_facility *fac;
  83     int nprincs;
  84
  85     setprogname(argv[0]);
  86
  87     ret = krb5_init_context(&context);
  88     if (ret)
  89         exit(1);
  90
  91     ret = krb5_openlog(context, "hpropd", &fac);
  92     if (ret)
  93         errx(1, "krb5_openlog");
  94     krb5_set_warn_dest(context, fac);
  95
  96     if (getarg(args, num_args, argc, argv, &optidx))
  97         usage(1);
  98
  99     if (local_realm != NULL)
 100         krb5_set_default_realm(context, local_realm);
 101
 102     if (help_flag)
 103         usage(0);
 104     if (version_flag) {
 105         print_version(NULL);
 106         exit(0);
 107     }
 108
 109     argc -= optidx;
 110     argv += optidx;
 111
 112     if (argc != 0)
 113         usage(1);
 114
 115     if (database == NULL)
 116         database = hdb_default_db(context);
 117
 118     if (from_stdin) {
 119         sock = STDIN_FILENO;
 120     } else {
 121         struct sockaddr_storage ss;
 122         struct sockaddr *sa = (struct sockaddr *)&ss;
 123         socklen_t sin_len = sizeof(ss);
 124         char addr_name[256];
 125         krb5_ticket *ticket;
 126         char *server;
 127
 128         memset(&ss, 0, sizeof(ss));
 129         sock = STDIN_FILENO;
 130 #ifdef SUPPORT_INETD
 131         if (inetd_flag == -1) {
 132             if (getpeername (sock, sa, &sin_len) < 0) {
 133                 inetd_flag = 0;
 134             } else {
 135                 inetd_flag = 1;
 136             }
 137         }
 138 #else
 139         inetd_flag = 0;
 140 #endif
 141         if (!inetd_flag) {
 142             mini_inetd (krb5_getportbyname (context, "hprop", "tcp",
 143                                             HPROP_PORT), &sock);
 144         }
 145         socket_set_keepalive(sock, 1);
 146         sin_len = sizeof(ss);
 147         if (getpeername(sock, sa, &sin_len) < 0)
 148             krb5_err(context, 1, errno, "getpeername");
 149
 150         if (inet_ntop(sa->sa_family,
 151                       socket_get_address (sa),
 152                       addr_name,
 153                       sizeof(addr_name)) == NULL)
 154             strlcpy (addr_name, "unknown address",
 155                      sizeof(addr_name));
 156
 157         krb5_log(context, fac, 0, "Connection from %s", addr_name);
 158
 159         ret = krb5_kt_register(context, &hdb_get_kt_ops);
 160         if (ret)
 161             krb5_err(context, 1, ret, "krb5_kt_register");
 162
 163         if (ktname != NULL) {
 164             ret = krb5_kt_resolve(context, ktname, &keytab);
 165             if (ret)
 166                 krb5_err (context, 1, ret, "krb5_kt_resolve %s", ktname);
 167         } else {
 168             ret = krb5_kt_default (context, &keytab);
 169             if (ret)
 170                 krb5_err (context, 1, ret, "krb5_kt_default");
 171         }
 172
 173         ret = krb5_recvauth(context, &ac, &sock, HPROP_VERSION, NULL,
 174                             0, keytab, &ticket);
 175         if (ret)
 176             krb5_err(context, 1, ret, "krb5_recvauth");
 177
 178         ret = krb5_unparse_name(context, ticket->server, &server);
 179         if (ret)
 180             krb5_err(context, 1, ret, "krb5_unparse_name");
 181         if (strncmp(server, "hprop/", 6) != 0)
 182             krb5_errx(context, 1, "ticket not for hprop (%s)", server);
 183
 184         free(server);
 185         krb5_free_ticket (context, ticket);
 186
 187         ret = krb5_auth_con_getauthenticator(context, ac, &authent);
 188         if (ret)
 189             krb5_err(context, 1, ret, "krb5_auth_con_getauthenticator");
 190
 191         ret = krb5_make_principal(context, &c1, NULL, "kadmin", "hprop", NULL);
 192         if (ret)
 193             krb5_err(context, 1, ret, "krb5_make_principal");
 194         _krb5_principalname2krb5_principal(context, &c2,
 195                                            authent->cname, authent->crealm);
 196         if (!krb5_principal_compare(context, c1, c2)) {
 197             char *s;
 198             ret = krb5_unparse_name(context, c2, &s);
 199             if (ret)
 200                 s = unparseable_name;
 201             krb5_errx(context, 1, "Unauthorized connection from %s", s);
 202         }
 203         krb5_free_principal(context, c1);
 204         krb5_free_principal(context, c2);
 205
 206         ret = krb5_kt_close(context, keytab);
 207         if (ret)
 208             krb5_err(context, 1, ret, "krb5_kt_close");
 209     }
 210
 211     if (asprintf(&tmp_db, "%s~", database) < 0 || tmp_db == NULL)
 212         krb5_errx(context, 1, "hdb_create: out of memory");
 213
 214     ret = hdb_create(context, &db, tmp_db);
 215     if (ret)
 216         krb5_err(context, 1, ret, "hdb_create(%s)", tmp_db);
 217     ret = db->hdb_open(context, db, O_RDWR | O_CREAT | O_TRUNC, 0600);
 218     if (ret)
 219         krb5_err(context, 1, ret, "hdb_open(%s)", tmp_db);
 220
 221     nprincs = 0;
 222     while (1){
 223         krb5_data data;
 224         hdb_entry entry;
 225
 226         if (from_stdin) {
 227             ret = krb5_read_message(context, &sock, &data);
 228             if (ret != 0 && ret != HEIM_ERR_EOF)
 229                 krb5_err(context, 1, ret, "krb5_read_message");
 230         } else {
 231             ret = krb5_read_priv_message(context, ac, &sock, &data);
 232             if (ret)
 233                 krb5_err(context, 1, ret, "krb5_read_priv_message");
 234         }
 235
 236         if (ret == HEIM_ERR_EOF || data.length == 0) {
 237             if (!from_stdin) {
 238                 data.data = NULL;
 239                 data.length = 0;
 240                 krb5_write_priv_message(context, ac, &sock, &data);
 241             }
 242             break;
 243         }
 244         memset(&entry, 0, sizeof(entry));
 245         ret = hdb_value2entry(context, &data, &entry);
 246         krb5_data_free(&data);
 247         if (ret)
 248             krb5_err(context, 1, ret, "hdb_value2entry");
 249         if (print_dump) {
 250             struct hdb_print_entry_arg parg;
 251
 252             parg.out = stdout;
 253             parg.fmt = HDB_DUMP_HEIMDAL;
 254             hdb_print_entry(context, db, &entry, &parg);
 255         } else {
 256             ret = db->hdb_store(context, db, 0, &entry);
 257             if (ret == HDB_ERR_EXISTS) {
 258                 char *s;
 259                 ret = krb5_unparse_name(context, entry.principal, &s);
 260                 if (ret)
 261                     s = strdup(unparseable_name);
 262                 krb5_warnx(context, "Entry exists: %s", s);
 263                 free(s);
 264             } else if (ret)
 265                 krb5_err(context, 1, ret, "db_store");
 266             else
 267                 nprincs++;
 268         }
 269         hdb_free_entry(context, db, &entry);
 270     }
 271     if (!print_dump)
 272         krb5_log(context, fac, 0, "Received %d principals", nprincs);
 273
 274     ret = db->hdb_close(context, db);
 275     if (ret)
 276         krb5_err(context, 1, ret, "db_close");
 277     ret = db->hdb_rename(context, db, database);
 278     if (ret)
 279         krb5_err(context, 1, ret, "db_rename");
 280
 281     if (inetd_flag == 0)
 282         rk_closesocket(sock);
 283
 284     exit(0);
 285 }