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" },
  48     { "print",      0, arg_flag, &print_dump, "print dump to stdout" },
  49 #ifdef SUPPORT_INETD
  50     { "inetd",     'i', arg_negative_flag,      &inetd_flag,
  51       "Not started from inetd" },
  52 #endif
  53     { "keytab",   'k',  arg_string, &ktname,    "keytab to use for authentication", "keytab" },
  54     { "realm",   'r',   arg_string, &local_realm, "realm to use" },
  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
  61 static void
  62 usage(int ret)
  63 {
  64     arg_printusage (args, num_args, NULL, "");
  65     exit (ret);
  66 }
  67
  68 int
  69 main(int argc, char **argv)
  70 {
  71     krb5_error_code ret;
  72     krb5_context context;
  73     krb5_auth_context ac = NULL;
  74     krb5_principal c1, c2;
  75     krb5_authenticator authent;
  76     krb5_keytab keytab;
  77     krb5_socket_t sock = rk_INVALID_SOCKET;
  78     HDB *db = NULL;
  79     int optidx = 0;
  80     char *tmp_db;
  81     krb5_log_facility *fac;
  82     int nprincs;
  83
  84     setprogname(argv[0]);
  85
  86     ret = krb5_init_context(&context);
  87     if(ret)
  88         exit(1);
  89
  90     ret = krb5_openlog(context, "hpropd", &fac);
  91     if(ret)
  92         errx(1, "krb5_openlog");
  93     krb5_set_warn_dest(context, fac);
  94
  95     if(getarg(args, num_args, argc, argv, &optidx))
  96         usage(1);
  97
  98     if(local_realm != NULL)
  99         krb5_set_default_realm(context, local_realm);
 100
 101     if(help_flag)
 102         usage(0);
 103     if(version_flag) {
 104         print_version(NULL);
 105         exit(0);
 106     }
 107
 108     argc -= optidx;
 109     argv += optidx;
 110
 111     if (argc != 0)
 112         usage(1);
 113
 114     if (database == NULL)
 115         database = hdb_default_db(context);
 116
 117     if(from_stdin) {
 118         sock = STDIN_FILENO;
 119     } else {
 120         struct sockaddr_storage ss;
 121         struct sockaddr *sa = (struct sockaddr *)&ss;
 122         socklen_t sin_len = sizeof(ss);
 123         char addr_name[256];
 124         krb5_ticket *ticket;
 125         char *server;
 126
 127         sock = STDIN_FILENO;
 128 #ifdef SUPPORT_INETD
 129         if (inetd_flag == -1) {
 130             if (getpeername (sock, sa, &sin_len) < 0) {
 131                 inetd_flag = 0;
 132             } else {
 133                 inetd_flag = 1;
 134             }
 135         }
 136 #else
 137         inetd_flag = 0;
 138 #endif
 139         if (!inetd_flag) {
 140             mini_inetd (krb5_getportbyname (context, "hprop", "tcp",
 141                                             HPROP_PORT), &sock);
 142         }
 143         sin_len = sizeof(ss);
 144         if(getpeername(sock, sa, &sin_len) < 0)
 145             krb5_err(context, 1, errno, "getpeername");
 146
 147         if (inet_ntop(sa->sa_family,
 148                       socket_get_address (sa),
 149                       addr_name,
 150                       sizeof(addr_name)) == NULL)
 151             strlcpy (addr_name, "unknown address",
 152                      sizeof(addr_name));
 153
 154         krb5_log(context, fac, 0, "Connection from %s", addr_name);
 155
 156         ret = krb5_kt_register(context, &hdb_kt_ops);
 157         if(ret)
 158             krb5_err(context, 1, ret, "krb5_kt_register");
 159
 160         if (ktname != NULL) {
 161             ret = krb5_kt_resolve(context, ktname, &keytab);
 162             if (ret)
 163                 krb5_err (context, 1, ret, "krb5_kt_resolve %s", ktname);
 164         } else {
 165             ret = krb5_kt_default (context, &keytab);
 166             if (ret)
 167                 krb5_err (context, 1, ret, "krb5_kt_default");
 168         }
 169
 170         ret = krb5_recvauth(context, &ac, &sock, HPROP_VERSION, NULL,
 171                             0, keytab, &ticket);
 172         if(ret)
 173             krb5_err(context, 1, ret, "krb5_recvauth");
 174
 175         ret = krb5_unparse_name(context, ticket->server, &server);
 176         if (ret)
 177             krb5_err(context, 1, ret, "krb5_unparse_name");
 178         if (strncmp(server, "hprop/", 5) != 0)
 179             krb5_errx(context, 1, "ticket not for hprop (%s)", server);
 180
 181         free(server);
 182         krb5_free_ticket (context, ticket);
 183
 184         ret = krb5_auth_con_getauthenticator(context, ac, &authent);
 185         if(ret)
 186             krb5_err(context, 1, ret, "krb5_auth_con_getauthenticator");
 187
 188         ret = krb5_make_principal(context, &c1, NULL, "kadmin", "hprop", NULL);
 189         if(ret)
 190             krb5_err(context, 1, ret, "krb5_make_principal");
 191         _krb5_principalname2krb5_principal(context, &c2,
 192                                            authent->cname, authent->crealm);
 193         if(!krb5_principal_compare(context, c1, c2)) {
 194             char *s;
 195             ret = krb5_unparse_name(context, c2, &s);
 196             if (ret)
 197                 s = "unparseable name";
 198             krb5_errx(context, 1, "Unauthorized connection from %s", s);
 199         }
 200         krb5_free_principal(context, c1);
 201         krb5_free_principal(context, c2);
 202
 203         ret = krb5_kt_close(context, keytab);
 204         if(ret)
 205             krb5_err(context, 1, ret, "krb5_kt_close");
 206     }
 207
 208     if(!print_dump) {
 209         asprintf(&tmp_db, "%s~", database);
 210
 211         ret = hdb_create(context, &db, tmp_db);
 212         if(ret)
 213             krb5_err(context, 1, ret, "hdb_create(%s)", tmp_db);
 214         ret = db->hdb_open(context, db, O_RDWR | O_CREAT | O_TRUNC, 0600);
 215         if(ret)
 216             krb5_err(context, 1, ret, "hdb_open(%s)", tmp_db);
 217     }
 218
 219     nprincs = 0;
 220     while(1){
 221         krb5_data data;
 222         hdb_entry_ex entry;
 223
 224         if(from_stdin) {
 225             ret = krb5_read_message(context, &sock, &data);
 226             if(ret != 0 && ret != HEIM_ERR_EOF)
 227                 krb5_err(context, 1, ret, "krb5_read_message");
 228         } else {
 229             ret = krb5_read_priv_message(context, ac, &sock, &data);
 230             if(ret)
 231                 krb5_err(context, 1, ret, "krb5_read_priv_message");
 232         }
 233
 234         if(ret == HEIM_ERR_EOF || data.length == 0) {
 235             if(!from_stdin) {
 236                 data.data = NULL;
 237                 data.length = 0;
 238                 krb5_write_priv_message(context, ac, &sock, &data);
 239             }
 240             if(!print_dump) {
 241                 ret = db->hdb_close(context, db);
 242                 if(ret)
 243                     krb5_err(context, 1, ret, "db_close");
 244                 ret = db->hdb_rename(context, db, database);
 245                 if(ret)
 246                     krb5_err(context, 1, ret, "db_rename");
 247             }
 248             break;
 249         }
 250         memset(&entry, 0, sizeof(entry));
 251         ret = hdb_value2entry(context, &data, &entry.entry);
 252         krb5_data_free(&data);
 253         if(ret)
 254             krb5_err(context, 1, ret, "hdb_value2entry");
 255         if(print_dump)
 256             hdb_print_entry(context, db, &entry, stdout);
 257         else {
 258             ret = db->hdb_store(context, db, 0, &entry);
 259             if(ret == HDB_ERR_EXISTS) {
 260                 char *s;
 261                 ret = krb5_unparse_name(context, entry.entry.principal, &s);
 262                 if (ret)
 263                     s = strdup("unparseable name");
 264                 krb5_warnx(context, "Entry exists: %s", s);
 265                 free(s);
 266             } else if(ret)
 267                 krb5_err(context, 1, ret, "db_store");
 268             else
 269                 nprincs++;
 270         }
 271         hdb_free_entry(context, &entry);
 272     }
 273     if (!print_dump)
 274         krb5_log(context, fac, 0, "Received %d principals", nprincs);
 275
 276     if (inetd_flag == 0)
 277         rk_closesocket(sock);
 278
 279     exit(0);
 280 }