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;
  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         sock = STDIN_FILENO;
 129 #ifdef SUPPORT_INETD
 130         if (inetd_flag == -1) {
 131             if (getpeername (sock, sa, &sin_len) < 0) {
 132                 inetd_flag = 0;
 133             } else {
 134                 inetd_flag = 1;
 135             }
 136         }
 137 #else
 138         inetd_flag = 0;
 139 #endif
 140         if (!inetd_flag) {
 141             mini_inetd (krb5_getportbyname (context, "hprop", "tcp",
 142                                             HPROP_PORT), &sock);
 143         }
 144         sin_len = sizeof(ss);
 145         if(getpeername(sock, sa, &sin_len) < 0)
 146             krb5_err(context, 1, errno, "getpeername");
 147
 148         if (inet_ntop(sa->sa_family,
 149                       socket_get_address (sa),
 150                       addr_name,
 151                       sizeof(addr_name)) == NULL)
 152             strlcpy (addr_name, "unknown address",
 153                      sizeof(addr_name));
 154
 155         krb5_log(context, fac, 0, "Connection from %s", addr_name);
 156
 157         ret = krb5_kt_register(context, &hdb_kt_ops);
 158         if(ret)
 159             krb5_err(context, 1, ret, "krb5_kt_register");
 160
 161         if (ktname != NULL) {
 162             ret = krb5_kt_resolve(context, ktname, &keytab);
 163             if (ret)
 164                 krb5_err (context, 1, ret, "krb5_kt_resolve %s", ktname);
 165         } else {
 166             ret = krb5_kt_default (context, &keytab);
 167             if (ret)
 168                 krb5_err (context, 1, ret, "krb5_kt_default");
 169         }
 170
 171         ret = krb5_recvauth(context, &ac, &sock, HPROP_VERSION, NULL,
 172                             0, keytab, &ticket);
 173         if(ret)
 174             krb5_err(context, 1, ret, "krb5_recvauth");
 175
 176         ret = krb5_unparse_name(context, ticket->server, &server);
 177         if (ret)
 178             krb5_err(context, 1, ret, "krb5_unparse_name");
 179         if (strncmp(server, "hprop/", 5) != 0)
 180             krb5_errx(context, 1, "ticket not for hprop (%s)", server);
 181
 182         free(server);
 183         krb5_free_ticket (context, ticket);
 184
 185         ret = krb5_auth_con_getauthenticator(context, ac, &authent);
 186         if(ret)
 187             krb5_err(context, 1, ret, "krb5_auth_con_getauthenticator");
 188
 189         ret = krb5_make_principal(context, &c1, NULL, "kadmin", "hprop", NULL);
 190         if(ret)
 191             krb5_err(context, 1, ret, "krb5_make_principal");
 192         _krb5_principalname2krb5_principal(context, &c2,
 193                                            authent->cname, authent->crealm);
 194         if(!krb5_principal_compare(context, c1, c2)) {
 195             char *s;
 196             ret = krb5_unparse_name(context, c2, &s);
 197             if (ret)
 198                 s = unparseable_name;
 199             krb5_errx(context, 1, "Unauthorized connection from %s", s);
 200         }
 201         krb5_free_principal(context, c1);
 202         krb5_free_principal(context, c2);
 203
 204         ret = krb5_kt_close(context, keytab);
 205         if(ret)
 206             krb5_err(context, 1, ret, "krb5_kt_close");
 207     }
 208
 209     if(!print_dump) {
 210         asprintf(&tmp_db, "%s~", database);
 211
 212         ret = hdb_create(context, &db, tmp_db);
 213         if(ret)
 214             krb5_err(context, 1, ret, "hdb_create(%s)", tmp_db);
 215         ret = db->hdb_open(context, db, O_RDWR | O_CREAT | O_TRUNC, 0600);
 216         if(ret)
 217             krb5_err(context, 1, ret, "hdb_open(%s)", tmp_db);
 218     }
 219
 220     nprincs = 0;
 221     while(1){
 222         krb5_data data;
 223         hdb_entry_ex entry;
 224
 225         if(from_stdin) {
 226             ret = krb5_read_message(context, &sock, &data);
 227             if(ret != 0 && ret != HEIM_ERR_EOF)
 228                 krb5_err(context, 1, ret, "krb5_read_message");
 229         } else {
 230             ret = krb5_read_priv_message(context, ac, &sock, &data);
 231             if(ret)
 232                 krb5_err(context, 1, ret, "krb5_read_priv_message");
 233         }
 234
 235         if(ret == HEIM_ERR_EOF || data.length == 0) {
 236             if(!from_stdin) {
 237                 data.data = NULL;
 238                 data.length = 0;
 239                 krb5_write_priv_message(context, ac, &sock, &data);
 240             }
 241             if(!print_dump) {
 242                 ret = db->hdb_close(context, db);
 243                 if(ret)
 244                     krb5_err(context, 1, ret, "db_close");
 245                 ret = db->hdb_rename(context, db, database);
 246                 if(ret)
 247                     krb5_err(context, 1, ret, "db_rename");
 248             }
 249             break;
 250         }
 251         memset(&entry, 0, sizeof(entry));
 252         ret = hdb_value2entry(context, &data, &entry.entry);
 253         krb5_data_free(&data);
 254         if(ret)
 255             krb5_err(context, 1, ret, "hdb_value2entry");
 256         if(print_dump)
 257             hdb_print_entry(context, db, &entry, stdout);
 258         else {
 259             ret = db->hdb_store(context, db, 0, &entry);
 260             if(ret == HDB_ERR_EXISTS) {
 261                 char *s;
 262                 ret = krb5_unparse_name(context, entry.entry.principal, &s);
 263                 if (ret)
 264                     s = strdup(unparseable_name);
 265                 krb5_warnx(context, "Entry exists: %s", s);
 266                 free(s);
 267             } else if(ret)
 268                 krb5_err(context, 1, ret, "db_store");
 269             else
 270                 nprincs++;
 271         }
 272         hdb_free_entry(context, &entry);
 273     }
 274     if (!print_dump)
 275         krb5_log(context, fac, 0, "Received %d principals", nprincs);
 276
 277     if (inetd_flag == 0)
 278         rk_closesocket(sock);
 279
 280     exit(0);
 281 }