490 lines
12 KiB
C
490 lines
12 KiB
C
/*
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* Copyright (c) 1997 - 2000 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_master.c,v 1.21 2000/11/15 23:12:45 assar Exp $");
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static krb5_log_facility *log_facility;
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static int
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make_signal_socket (krb5_context context)
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{
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struct sockaddr_un addr;
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int fd;
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fd = socket (AF_UNIX, SOCK_DGRAM, 0);
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if (fd < 0)
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krb5_err (context, 1, errno, "socket AF_UNIX");
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memset (&addr, 0, sizeof(addr));
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addr.sun_family = AF_UNIX;
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strlcpy (addr.sun_path, KADM5_LOG_SIGNAL, sizeof(addr.sun_path));
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unlink (addr.sun_path);
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if (bind (fd, (struct sockaddr *)&addr, sizeof(addr)) < 0)
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krb5_err (context, 1, errno, "bind %s", addr.sun_path);
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return fd;
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}
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static int
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make_listen_socket (krb5_context context)
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{
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int fd;
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int one = 1;
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struct sockaddr_in addr;
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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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setsockopt (fd, SOL_SOCKET, SO_REUSEADDR, &one, sizeof(one));
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memset (&addr, 0, sizeof(addr));
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addr.sin_family = AF_INET;
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addr.sin_port = krb5_getportbyname (context,
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IPROP_SERVICE, "tcp", IPROP_PORT);
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if(bind(fd, (struct sockaddr *)&addr, sizeof(addr)) < 0)
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krb5_err (context, 1, errno, "bind");
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if (listen(fd, SOMAXCONN) < 0)
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krb5_err (context, 1, errno, "listen");
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return fd;
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}
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struct slave {
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int fd;
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struct sockaddr_in addr;
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char *name;
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krb5_auth_context ac;
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u_int32_t version;
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struct slave *next;
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};
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typedef struct slave slave;
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static int
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check_acl (krb5_context context, const char *name)
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{
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FILE *fp;
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char buf[256];
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int ret = 1;
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fp = fopen (KADM5_SLAVE_ACL, "r");
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if (fp == NULL)
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return 1;
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while (fgets(buf, sizeof(buf), fp) != NULL) {
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if (buf[strlen(buf) - 1 ] == '\n')
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buf[strlen(buf) - 1 ] = '\0';
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if (strcmp (buf, name) == 0) {
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ret = 0;
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break;
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}
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}
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fclose (fp);
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return ret;
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}
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static void
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add_slave (krb5_context context, krb5_keytab keytab, slave **root, int fd)
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{
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krb5_principal server;
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krb5_error_code ret;
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slave *s;
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socklen_t addr_len;
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krb5_ticket *ticket = NULL;
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char hostname[128];
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s = malloc(sizeof(*s));
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if (s == NULL) {
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krb5_warnx (context, "add_slave: no memory");
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return;
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}
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s->name = NULL;
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s->ac = NULL;
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addr_len = sizeof(s->addr);
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s->fd = accept (fd, (struct sockaddr *)&s->addr, &addr_len);
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if (s->fd < 0) {
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krb5_warn (context, errno, "accept");
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goto error;
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}
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gethostname(hostname, sizeof(hostname));
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ret = krb5_sname_to_principal (context, hostname, IPROP_NAME,
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KRB5_NT_SRV_HST, &server);
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if (ret) {
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krb5_warn (context, ret, "krb5_sname_to_principal");
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goto error;
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}
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ret = krb5_recvauth (context, &s->ac, &s->fd,
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IPROP_VERSION, server, 0, keytab, &ticket);
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krb5_free_principal (context, server);
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if (ret) {
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krb5_warn (context, ret, "krb5_recvauth");
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goto error;
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}
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ret = krb5_unparse_name (context, ticket->client, &s->name);
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if (ret) {
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krb5_warn (context, ret, "krb5_unparse_name");
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goto error;
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}
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if (check_acl (context, s->name)) {
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krb5_warnx (context, "%s not in acl", s->name);
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goto error;
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}
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krb5_free_ticket (context, ticket);
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krb5_warnx (context, "connection from %s", s->name);
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s->version = 0;
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s->next = *root;
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*root = s;
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return;
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error:
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if (s->name)
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free (s->name);
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if (s->ac)
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krb5_auth_con_free(context, s->ac);
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if (ticket)
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krb5_free_ticket (context, ticket);
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close (s->fd);
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free(s);
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}
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static void
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remove_slave (krb5_context context, slave *s, slave **root)
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{
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slave **p;
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close (s->fd);
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free (s->name);
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krb5_auth_con_free (context, s->ac);
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for (p = root; *p; p = &(*p)->next)
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if (*p == s) {
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*p = s->next;
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break;
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}
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free (s);
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}
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struct prop_context {
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krb5_auth_context auth_context;
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int fd;
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};
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static int
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prop_one (krb5_context context, HDB *db, hdb_entry *entry, void *v)
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{
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krb5_error_code ret;
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krb5_data data;
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struct slave *slave = (struct slave *)v;
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ret = hdb_entry2value (context, entry, &data);
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if (ret)
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return ret;
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ret = krb5_data_realloc (&data, data.length + 4);
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if (ret) {
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krb5_data_free (&data);
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return ret;
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}
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memmove ((char *)data.data + 4, data.data, data.length - 4);
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_krb5_put_int (data.data, ONE_PRINC, 4);
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ret = krb5_write_priv_message (context, slave->ac, &slave->fd, &data);
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krb5_data_free (&data);
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return ret;
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}
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static int
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send_complete (krb5_context context, slave *s,
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const char *database, u_int32_t current_version)
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{
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krb5_error_code ret;
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HDB *db;
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krb5_data data;
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char buf[8];
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ret = hdb_create (context, &db, database);
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if (ret)
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krb5_err (context, 1, ret, "hdb_create: %s", database);
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ret = db->open (context, db, O_RDONLY, 0);
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if (ret)
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krb5_err (context, 1, ret, "db->open");
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_krb5_put_int(buf, TELL_YOU_EVERYTHING, 4);
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data.data = buf;
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data.length = 4;
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ret = krb5_write_priv_message(context, s->ac, &s->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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ret = hdb_foreach (context, db, 0, prop_one, s);
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if (ret)
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krb5_err (context, 1, ret, "hdb_foreach");
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_krb5_put_int (buf, NOW_YOU_HAVE, 4);
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_krb5_put_int (buf + 4, current_version, 4);
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data.length = 8;
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ret = krb5_write_priv_message(context, s->ac, &s->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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return 0;
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}
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static int
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send_diffs (krb5_context context, slave *s, int log_fd,
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const char *database, u_int32_t current_version)
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{
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krb5_storage *sp;
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u_int32_t ver;
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time_t timestamp;
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enum kadm_ops op;
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u_int32_t len;
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off_t right, left;
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krb5_data data;
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int ret = 0;
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if (s->version == current_version)
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return 0;
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sp = kadm5_log_goto_end (log_fd);
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right = sp->seek(sp, 0, SEEK_CUR);
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for (;;) {
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if (kadm5_log_previous (sp, &ver, ×tamp, &op, &len))
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abort ();
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left = sp->seek(sp, -16, SEEK_CUR);
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if (ver == s->version)
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return 0;
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if (ver == s->version + 1)
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break;
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if (left == 0)
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return send_complete (context, s, database, current_version);
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}
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krb5_data_alloc (&data, right - left + 4);
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sp->fetch (sp, (char *)data.data + 4, data.length - 4);
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krb5_storage_free(sp);
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_krb5_put_int(data.data, FOR_YOU, 4);
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ret = krb5_write_priv_message(context, s->ac, &s->fd, &data);
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if (ret) {
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krb5_warn (context, ret, "krb5_write_priv_message");
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return 1;
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}
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return 0;
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}
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static int
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process_msg (krb5_context context, slave *s, int log_fd,
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const char *database, u_int32_t current_version)
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{
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int ret = 0;
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krb5_data out;
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krb5_storage *sp;
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int32_t tmp;
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ret = krb5_read_priv_message(context, s->ac, &s->fd, &out);
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if(ret) {
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krb5_warn (context, ret, "error reading message from %s", s->name);
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return 1;
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}
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sp = krb5_storage_from_mem (out.data, out.length);
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krb5_ret_int32 (sp, &tmp);
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switch (tmp) {
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case I_HAVE :
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krb5_ret_int32 (sp, &tmp);
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s->version = tmp;
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ret = send_diffs (context, s, log_fd, database, current_version);
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break;
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case FOR_YOU :
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default :
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krb5_warnx (context, "Ignoring command %d", tmp);
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break;
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}
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krb5_data_free (&out);
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return ret;
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}
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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 = "HDB:";
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static char *database;
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static struct getargs args[] = {
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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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{ "database", 'd', arg_string, &database, "database", "file"},
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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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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 signal_fd, listen_fd;
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int log_fd;
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slave *slaves = NULL;
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u_int32_t current_version, old_version = 0;
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krb5_keytab keytab;
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int optind;
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optind = krb5_program_setup(&context, argc, argv, args, num_args, NULL);
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if(help_flag)
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krb5_std_usage(0, args, num_args);
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if(version_flag) {
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print_version(NULL);
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exit(0);
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}
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krb5_openlog (context, "ipropd-master", &log_facility);
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krb5_set_warn_dest(context, log_facility);
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ret = krb5_kt_register(context, &hdb_kt_ops);
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if(ret)
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krb5_err(context, 1, ret, "krb5_kt_register");
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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, "krb5_kt_resolve: %s", keytab_str);
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memset(&conf, 0, sizeof(conf));
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if(realm) {
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conf.mask |= KADM5_CONFIG_REALM;
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conf.realm = realm;
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}
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ret = kadm5_init_with_skey_ctx (context,
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KADM5_ADMIN_SERVICE,
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NULL,
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KADM5_ADMIN_SERVICE,
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&conf, 0, 0,
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&kadm_handle);
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if (ret)
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krb5_err (context, 1, ret, "kadm5_init_with_password_ctx");
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server_context = (kadm5_server_context *)kadm_handle;
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log_fd = open (server_context->log_context.log_file, O_RDONLY, 0);
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if (log_fd < 0)
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krb5_err (context, 1, errno, "open %s",
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server_context->log_context.log_file);
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signal_fd = make_signal_socket (context);
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listen_fd = make_listen_socket (context);
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signal (SIGPIPE, SIG_IGN);
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for (;;) {
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slave *p;
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fd_set readset;
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int max_fd = 0;
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struct timeval to = {30, 0};
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u_int32_t vers;
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if (signal_fd >= FD_SETSIZE || listen_fd >= FD_SETSIZE)
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krb5_errx (context, 1, "fd too large");
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FD_ZERO(&readset);
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FD_SET(signal_fd, &readset);
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max_fd = max(max_fd, signal_fd);
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FD_SET(listen_fd, &readset);
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max_fd = max(max_fd, listen_fd);
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for (p = slaves; p != NULL; p = p->next) {
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FD_SET(p->fd, &readset);
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max_fd = max(max_fd, p->fd);
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}
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ret = select (max_fd + 1,
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&readset, NULL, NULL, &to);
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if (ret < 0) {
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if (errno == EINTR)
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continue;
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else
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krb5_err (context, 1, errno, "select");
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}
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if (ret == 0) {
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old_version = current_version;
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kadm5_log_get_version_fd (log_fd, ¤t_version);
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if (current_version > old_version)
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for (p = slaves; p != NULL; p = p->next)
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send_diffs (context, p, log_fd, database, current_version);
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}
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if (ret && FD_ISSET(signal_fd, &readset)) {
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struct sockaddr_un peer_addr;
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socklen_t peer_len = sizeof(peer_addr);
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if(recvfrom(signal_fd, &vers, sizeof(vers), 0,
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(struct sockaddr *)&peer_addr, &peer_len) < 0) {
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krb5_warn (context, errno, "recvfrom");
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continue;
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}
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--ret;
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old_version = current_version;
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kadm5_log_get_version_fd (log_fd, ¤t_version);
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for (p = slaves; p != NULL; p = p->next)
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send_diffs (context, p, log_fd, database, current_version);
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}
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for(p = slaves; p != NULL && ret--; p = p->next)
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if (FD_ISSET(p->fd, &readset)) {
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if(process_msg (context, p, log_fd, database, current_version))
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remove_slave (context, p, &slaves);
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}
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if (ret && FD_ISSET(listen_fd, &readset)) {
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add_slave (context, keytab, &slaves, listen_fd);
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--ret;
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}
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}
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return 0;
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}
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