633 lines
18 KiB
C
633 lines
18 KiB
C
/*
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* Copyright (c) 1997 - 2007 Kungliga Tekniska Högskolan
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* (Royal Institute of Technology, Stockholm, Sweden).
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include "iprop.h"
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RCSID("$Id: ipropd_slave.c 22211 2007-12-07 19:27:27Z lha $");
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static krb5_log_facility *log_facility;
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static char *server_time_lost = "5 min";
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static int time_before_lost;
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const char *slave_str = NULL;
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static int
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connect_to_master (krb5_context context, const char *master,
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const char *port_str)
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{
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int fd;
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struct sockaddr_in addr;
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struct hostent *he;
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fd = socket (AF_INET, SOCK_STREAM, 0);
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if (fd < 0)
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krb5_err (context, 1, errno, "socket AF_INET");
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memset (&addr, 0, sizeof(addr));
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addr.sin_family = AF_INET;
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if (port_str) {
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addr.sin_port = krb5_getportbyname (context,
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port_str, "tcp",
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0);
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if (addr.sin_port == 0) {
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char *ptr;
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long port;
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port = strtol (port_str, &ptr, 10);
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if (port == 0 && ptr == port_str)
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krb5_errx (context, 1, "bad port `%s'", port_str);
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addr.sin_port = htons(port);
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}
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} else {
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addr.sin_port = krb5_getportbyname (context, IPROP_SERVICE,
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"tcp", IPROP_PORT);
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}
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he = roken_gethostbyname (master);
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if (he == NULL)
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krb5_errx (context, 1, "gethostbyname: %s", hstrerror(h_errno));
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memcpy (&addr.sin_addr, he->h_addr, sizeof(addr.sin_addr));
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if(connect(fd, (struct sockaddr *)&addr, sizeof(addr)) < 0)
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krb5_err (context, 1, errno, "connect");
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return fd;
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}
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static void
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get_creds(krb5_context context, const char *keytab_str,
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krb5_ccache *cache, const char *serverhost)
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{
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krb5_keytab keytab;
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krb5_principal client;
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krb5_error_code ret;
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krb5_get_init_creds_opt *init_opts;
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krb5_creds creds;
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char *server;
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char keytab_buf[256];
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if (keytab_str == NULL) {
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ret = krb5_kt_default_name (context, keytab_buf, sizeof(keytab_buf));
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if (ret)
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krb5_err (context, 1, ret, "krb5_kt_default_name");
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keytab_str = keytab_buf;
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}
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ret = krb5_kt_resolve(context, keytab_str, &keytab);
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if(ret)
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krb5_err(context, 1, ret, "%s", keytab_str);
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ret = krb5_sname_to_principal (context, slave_str, IPROP_NAME,
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KRB5_NT_SRV_HST, &client);
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if (ret) krb5_err(context, 1, ret, "krb5_sname_to_principal");
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ret = krb5_get_init_creds_opt_alloc(context, &init_opts);
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if (ret) krb5_err(context, 1, ret, "krb5_get_init_creds_opt_alloc");
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asprintf (&server, "%s/%s", IPROP_NAME, serverhost);
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if (server == NULL)
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krb5_errx (context, 1, "malloc: no memory");
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ret = krb5_get_init_creds_keytab(context, &creds, client, keytab,
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0, server, init_opts);
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free (server);
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krb5_get_init_creds_opt_free(context, init_opts);
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if(ret) krb5_err(context, 1, ret, "krb5_get_init_creds");
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ret = krb5_kt_close(context, keytab);
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if(ret) krb5_err(context, 1, ret, "krb5_kt_close");
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ret = krb5_cc_gen_new(context, &krb5_mcc_ops, cache);
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if(ret) krb5_err(context, 1, ret, "krb5_cc_gen_new");
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ret = krb5_cc_initialize(context, *cache, client);
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if(ret) krb5_err(context, 1, ret, "krb5_cc_initialize");
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ret = krb5_cc_store_cred(context, *cache, &creds);
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if(ret) krb5_err(context, 1, ret, "krb5_cc_store_cred");
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}
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static void
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ihave (krb5_context context, krb5_auth_context auth_context,
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int fd, uint32_t version)
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{
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int ret;
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u_char buf[8];
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krb5_storage *sp;
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krb5_data data;
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sp = krb5_storage_from_mem (buf, 8);
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krb5_store_int32 (sp, I_HAVE);
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krb5_store_int32 (sp, version);
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krb5_storage_free (sp);
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data.length = 8;
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data.data = buf;
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ret = krb5_write_priv_message(context, auth_context, &fd, &data);
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if (ret)
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krb5_err (context, 1, ret, "krb5_write_priv_message");
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}
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static void
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receive_loop (krb5_context context,
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krb5_storage *sp,
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kadm5_server_context *server_context)
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{
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int ret;
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off_t left, right;
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void *buf;
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int32_t vers, vers2;
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ssize_t sret;
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/*
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* Seek to the current version of the local database.
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*/
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do {
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int32_t len, timestamp, tmp;
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enum kadm_ops op;
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if(krb5_ret_int32 (sp, &vers) != 0)
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return;
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krb5_ret_int32 (sp, ×tamp);
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krb5_ret_int32 (sp, &tmp);
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op = tmp;
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krb5_ret_int32 (sp, &len);
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if (vers <= server_context->log_context.version)
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krb5_storage_seek(sp, len + 8, SEEK_CUR);
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} while(vers <= server_context->log_context.version);
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/*
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* Read up rest of the entires into the memory...
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*/
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left = krb5_storage_seek (sp, -16, SEEK_CUR);
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right = krb5_storage_seek (sp, 0, SEEK_END);
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buf = malloc (right - left);
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if (buf == NULL && (right - left) != 0)
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krb5_errx (context, 1, "malloc: no memory");
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/*
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* ...and then write them out to the on-disk log.
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*/
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krb5_storage_seek (sp, left, SEEK_SET);
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krb5_storage_read (sp, buf, right - left);
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sret = write (server_context->log_context.log_fd, buf, right-left);
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if (sret != right - left)
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krb5_err(context, 1, errno, "Failed to write log to disk");
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ret = fsync (server_context->log_context.log_fd);
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if (ret)
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krb5_err(context, 1, errno, "Failed to sync log to disk");
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free (buf);
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/*
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* Go back to the startpoint and start to commit the entires to
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* the database.
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*/
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krb5_storage_seek (sp, left, SEEK_SET);
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for(;;) {
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int32_t len, len2, timestamp, tmp;
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off_t cur, cur2;
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enum kadm_ops op;
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if(krb5_ret_int32 (sp, &vers) != 0)
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break;
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ret = krb5_ret_int32 (sp, ×tamp);
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if (ret) krb5_errx(context, 1, "entry %ld: too short", (long)vers);
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ret = krb5_ret_int32 (sp, &tmp);
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if (ret) krb5_errx(context, 1, "entry %ld: too short", (long)vers);
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op = tmp;
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ret = krb5_ret_int32 (sp, &len);
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if (ret) krb5_errx(context, 1, "entry %ld: too short", (long)vers);
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if (len < 0)
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krb5_errx(context, 1, "log is corrupted, "
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"negative length of entry version %ld: %ld",
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(long)vers, (long)len);
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cur = krb5_storage_seek(sp, 0, SEEK_CUR);
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krb5_warnx (context, "replaying entry %d", (int)vers);
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ret = kadm5_log_replay (server_context,
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op, vers, len, sp);
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if (ret) {
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char *s = krb5_get_error_message(server_context->context, ret);
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krb5_warnx (context,
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"kadm5_log_replay: %ld. Lost entry entry, "
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"Database out of sync ?: %s (%d)",
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(long)vers, s ? s : "unknown error", ret);
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krb5_xfree(s);
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}
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{
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/*
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* Make sure the krb5_log_replay does the right thing wrt
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* reading out data from the sp.
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*/
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cur2 = krb5_storage_seek(sp, 0, SEEK_CUR);
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if (cur + len != cur2)
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krb5_errx(context, 1,
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"kadm5_log_reply version: %ld didn't read the whole entry",
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(long)vers);
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}
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if (krb5_ret_int32 (sp, &len2) != 0)
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krb5_errx(context, 1, "entry %ld: postamble too short", (long)vers);
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if(krb5_ret_int32 (sp, &vers2) != 0)
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krb5_errx(context, 1, "entry %ld: postamble too short", (long)vers);
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if (len != len2)
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krb5_errx(context, 1, "entry %ld: len != len2", (long)vers);
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if (vers != vers2)
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krb5_errx(context, 1, "entry %ld: vers != vers2", (long)vers);
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}
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/*
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* Update version
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*/
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server_context->log_context.version = vers;
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}
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static void
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receive (krb5_context context,
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krb5_storage *sp,
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kadm5_server_context *server_context)
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{
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int ret;
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ret = server_context->db->hdb_open(context,
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server_context->db,
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O_RDWR | O_CREAT, 0600);
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if (ret)
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krb5_err (context, 1, ret, "db->open");
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receive_loop (context, sp, server_context);
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ret = server_context->db->hdb_close (context, server_context->db);
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if (ret)
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krb5_err (context, 1, ret, "db->close");
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}
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static void
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send_im_here (krb5_context context, int fd,
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krb5_auth_context auth_context)
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{
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krb5_storage *sp;
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krb5_data data;
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int ret;
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ret = krb5_data_alloc (&data, 4);
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if (ret)
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krb5_err (context, 1, ret, "send_im_here");
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sp = krb5_storage_from_data (&data);
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if (sp == NULL)
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krb5_errx (context, 1, "krb5_storage_from_data");
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krb5_store_int32(sp, I_AM_HERE);
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krb5_storage_free(sp);
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ret = krb5_write_priv_message(context, auth_context, &fd, &data);
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krb5_data_free(&data);
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if (ret)
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krb5_err (context, 1, ret, "krb5_write_priv_message");
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}
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static void
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receive_everything (krb5_context context, int fd,
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kadm5_server_context *server_context,
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krb5_auth_context auth_context)
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{
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int ret;
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krb5_data data;
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int32_t vno;
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int32_t opcode;
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krb5_storage *sp;
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char *dbname;
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HDB *mydb;
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krb5_warnx(context, "receive complete database");
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asprintf(&dbname, "%s-NEW", server_context->db->hdb_name);
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ret = hdb_create(context, &mydb, dbname);
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if(ret)
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krb5_err(context,1, ret, "hdb_create");
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free(dbname);
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ret = hdb_set_master_keyfile (context,
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mydb, server_context->config.stash_file);
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if(ret)
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krb5_err(context,1, ret, "hdb_set_master_keyfile");
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/* I really want to use O_EXCL here, but given that I can't easily clean
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up on error, I won't */
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ret = mydb->hdb_open(context, mydb, O_RDWR | O_CREAT | O_TRUNC, 0600);
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if (ret)
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krb5_err (context, 1, ret, "db->open");
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sp = NULL;
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do {
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ret = krb5_read_priv_message(context, auth_context, &fd, &data);
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if (ret)
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krb5_err (context, 1, ret, "krb5_read_priv_message");
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sp = krb5_storage_from_data (&data);
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if (sp == NULL)
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krb5_errx (context, 1, "krb5_storage_from_data");
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krb5_ret_int32 (sp, &opcode);
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if (opcode == ONE_PRINC) {
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krb5_data fake_data;
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hdb_entry_ex entry;
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krb5_storage_free(sp);
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fake_data.data = (char *)data.data + 4;
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fake_data.length = data.length - 4;
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memset(&entry, 0, sizeof(entry));
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ret = hdb_value2entry (context, &fake_data, &entry.entry);
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if (ret)
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krb5_err (context, 1, ret, "hdb_value2entry");
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ret = mydb->hdb_store(server_context->context,
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mydb,
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0, &entry);
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if (ret)
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krb5_err (context, 1, ret, "hdb_store");
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hdb_free_entry (context, &entry);
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krb5_data_free (&data);
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} else if (opcode == NOW_YOU_HAVE)
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;
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else
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krb5_errx (context, 1, "strange opcode %d", opcode);
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} while (opcode == ONE_PRINC);
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if (opcode != NOW_YOU_HAVE)
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krb5_errx (context, 1, "receive_everything: strange %d", opcode);
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krb5_ret_int32 (sp, &vno);
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krb5_storage_free(sp);
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ret = kadm5_log_reinit (server_context);
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if (ret)
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krb5_err(context, 1, ret, "kadm5_log_reinit");
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ret = kadm5_log_set_version (server_context, vno - 1);
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if (ret)
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krb5_err (context, 1, ret, "kadm5_log_set_version");
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ret = kadm5_log_nop (server_context);
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if (ret)
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krb5_err (context, 1, ret, "kadm5_log_nop");
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krb5_data_free (&data);
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ret = mydb->hdb_rename (context, mydb, server_context->db->hdb_name);
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if (ret)
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krb5_err (context, 1, ret, "db->rename");
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ret = mydb->hdb_close (context, mydb);
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if (ret)
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krb5_err (context, 1, ret, "db->close");
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ret = mydb->hdb_destroy (context, mydb);
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if (ret)
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krb5_err (context, 1, ret, "db->destroy");
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krb5_warnx(context, "receive complete database, version %ld", (long)vno);
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}
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static char *config_file;
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static char *realm;
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static int version_flag;
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static int help_flag;
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static char *keytab_str;
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static char *port_str;
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static int detach_from_console = 0;
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static struct getargs args[] = {
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{ "config-file", 'c', arg_string, &config_file },
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{ "realm", 'r', arg_string, &realm },
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{ "keytab", 'k', arg_string, &keytab_str,
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"keytab to get authentication from", "kspec" },
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{ "time-lost", 0, arg_string, &server_time_lost,
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"time before server is considered lost", "time" },
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{ "port", 0, arg_string, &port_str,
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"port ipropd-slave will connect to", "port"},
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{ "detach", 0, arg_flag, &detach_from_console,
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"detach from console" },
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{ "hostname", 0, arg_string, &slave_str,
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"hostname of slave (if not same as hostname)", "hostname" },
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{ "version", 0, arg_flag, &version_flag },
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{ "help", 0, arg_flag, &help_flag }
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};
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static int num_args = sizeof(args) / sizeof(args[0]);
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int
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main(int argc, char **argv)
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{
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krb5_error_code ret;
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krb5_context context;
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krb5_auth_context auth_context;
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void *kadm_handle;
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kadm5_server_context *server_context;
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kadm5_config_params conf;
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int master_fd;
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krb5_ccache ccache;
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krb5_principal server;
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char **files;
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int optidx;
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const char *master;
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|
|
optidx = krb5_program_setup(&context, argc, argv, args, num_args, NULL);
|
|
|
|
if(help_flag)
|
|
krb5_std_usage(0, args, num_args);
|
|
if(version_flag) {
|
|
print_version(NULL);
|
|
exit(0);
|
|
}
|
|
|
|
setup_signal();
|
|
|
|
if (config_file == NULL) {
|
|
asprintf(&config_file, "%s/kdc.conf", hdb_db_dir(context));
|
|
if (config_file == NULL)
|
|
errx(1, "out of memory");
|
|
}
|
|
|
|
ret = krb5_prepend_config_files_default(config_file, &files);
|
|
if (ret)
|
|
krb5_err(context, 1, ret, "getting configuration files");
|
|
|
|
ret = krb5_set_config_files(context, files);
|
|
krb5_free_config_files(files);
|
|
if (ret)
|
|
krb5_err(context, 1, ret, "reading configuration files");
|
|
|
|
argc -= optidx;
|
|
argv += optidx;
|
|
|
|
if (argc != 1)
|
|
krb5_std_usage(1, args, num_args);
|
|
|
|
master = argv[0];
|
|
|
|
if (detach_from_console)
|
|
daemon(0, 0);
|
|
pidfile (NULL);
|
|
krb5_openlog (context, "ipropd-slave", &log_facility);
|
|
krb5_set_warn_dest(context, log_facility);
|
|
|
|
ret = krb5_kt_register(context, &hdb_kt_ops);
|
|
if(ret)
|
|
krb5_err(context, 1, ret, "krb5_kt_register");
|
|
|
|
time_before_lost = parse_time (server_time_lost, "s");
|
|
if (time_before_lost < 0)
|
|
krb5_errx (context, 1, "couldn't parse time: %s", server_time_lost);
|
|
|
|
memset(&conf, 0, sizeof(conf));
|
|
if(realm) {
|
|
conf.mask |= KADM5_CONFIG_REALM;
|
|
conf.realm = realm;
|
|
}
|
|
ret = kadm5_init_with_password_ctx (context,
|
|
KADM5_ADMIN_SERVICE,
|
|
NULL,
|
|
KADM5_ADMIN_SERVICE,
|
|
&conf, 0, 0,
|
|
&kadm_handle);
|
|
if (ret)
|
|
krb5_err (context, 1, ret, "kadm5_init_with_password_ctx");
|
|
|
|
server_context = (kadm5_server_context *)kadm_handle;
|
|
|
|
ret = kadm5_log_init (server_context);
|
|
if (ret)
|
|
krb5_err (context, 1, ret, "kadm5_log_init");
|
|
|
|
get_creds(context, keytab_str, &ccache, master);
|
|
|
|
master_fd = connect_to_master (context, master, port_str);
|
|
|
|
ret = krb5_sname_to_principal (context, master, IPROP_NAME,
|
|
KRB5_NT_SRV_HST, &server);
|
|
if (ret)
|
|
krb5_err (context, 1, ret, "krb5_sname_to_principal");
|
|
|
|
auth_context = NULL;
|
|
ret = krb5_sendauth (context, &auth_context, &master_fd,
|
|
IPROP_VERSION, NULL, server,
|
|
AP_OPTS_MUTUAL_REQUIRED, NULL, NULL,
|
|
ccache, NULL, NULL, NULL);
|
|
if (ret)
|
|
krb5_err (context, 1, ret, "krb5_sendauth");
|
|
|
|
krb5_warnx(context, "ipropd-slave started at version: %ld",
|
|
(long)server_context->log_context.version);
|
|
|
|
ihave (context, auth_context, master_fd,
|
|
server_context->log_context.version);
|
|
|
|
while (exit_flag == 0) {
|
|
krb5_data out;
|
|
krb5_storage *sp;
|
|
int32_t tmp;
|
|
fd_set readset;
|
|
struct timeval to;
|
|
|
|
if (master_fd >= FD_SETSIZE)
|
|
krb5_errx (context, 1, "fd too large");
|
|
|
|
FD_ZERO(&readset);
|
|
FD_SET(master_fd, &readset);
|
|
|
|
to.tv_sec = time_before_lost;
|
|
to.tv_usec = 0;
|
|
|
|
ret = select (master_fd + 1,
|
|
&readset, NULL, NULL, &to);
|
|
if (ret < 0) {
|
|
if (errno == EINTR)
|
|
continue;
|
|
else
|
|
krb5_err (context, 1, errno, "select");
|
|
}
|
|
if (ret == 0)
|
|
krb5_errx (context, 1, "server didn't send a message "
|
|
"in %d seconds", time_before_lost);
|
|
|
|
ret = krb5_read_priv_message(context, auth_context, &master_fd, &out);
|
|
|
|
if (ret)
|
|
krb5_err (context, 1, ret, "krb5_read_priv_message");
|
|
|
|
sp = krb5_storage_from_mem (out.data, out.length);
|
|
krb5_ret_int32 (sp, &tmp);
|
|
switch (tmp) {
|
|
case FOR_YOU :
|
|
receive (context, sp, server_context);
|
|
ihave (context, auth_context, master_fd,
|
|
server_context->log_context.version);
|
|
break;
|
|
case TELL_YOU_EVERYTHING :
|
|
receive_everything (context, master_fd, server_context,
|
|
auth_context);
|
|
break;
|
|
case ARE_YOU_THERE :
|
|
send_im_here (context, master_fd, auth_context);
|
|
break;
|
|
case NOW_YOU_HAVE :
|
|
case I_HAVE :
|
|
case ONE_PRINC :
|
|
case I_AM_HERE :
|
|
default :
|
|
krb5_warnx (context, "Ignoring command %d", tmp);
|
|
break;
|
|
}
|
|
krb5_storage_free (sp);
|
|
krb5_data_free (&out);
|
|
}
|
|
|
|
if(exit_flag == SIGXCPU)
|
|
krb5_warnx(context, "%s CPU time limit exceeded", getprogname());
|
|
else if(exit_flag == SIGINT || exit_flag == SIGTERM)
|
|
krb5_warnx(context, "%s terminated", getprogname());
|
|
else
|
|
krb5_warnx(context, "%s unexpected exit reason: %d",
|
|
getprogname(), exit_flag);
|
|
|
|
return 0;
|
|
}
|