/* $NetBSD: ldap.c,v 1.2 2018/04/07 22:37:30 christos Exp $ */
/* ldap.c
Routines for reading the configuration from LDAP */
/*
* Copyright (c) 2010-2017 by Internet Systems Consortium, Inc. ("ISC")
* Copyright (c) 2003-2006 Ntelos, Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of The Internet Software Consortium nor the names
* of its contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE INTERNET SOFTWARE CONSORTIUM AND
* CONTRIBUTORS ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE INTERNET SOFTWARE CONSORTIUM OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* This LDAP module was written by Brian Masney <masneyb@ntelos.net>. Its
* development was sponsored by Ntelos, Inc. (www.ntelos.com).
*/
#include <sys/cdefs.h>
__RCSID("$NetBSD: ldap.c,v 1.2 2018/04/07 22:37:30 christos Exp $");
#include "dhcpd.h"
#if defined(LDAP_CONFIGURATION)
#include <signal.h>
#include <errno.h>
#include <ctype.h>
#include <netdb.h>
#include <net/if.h>
#if defined(HAVE_IFADDRS_H)
#include <ifaddrs.h>
#endif
#include <string.h>
#if defined(LDAP_CASA_AUTH)
#include "ldap_casa.h"
#endif
#if defined(LDAP_USE_GSSAPI)
#include <sasl/sasl.h>
#include "ldap_krb_helper.h"
#endif
static LDAP * ld = NULL;
static char *ldap_server = NULL,
*ldap_username = NULL,
*ldap_password = NULL,
*ldap_base_dn = NULL,
*ldap_dhcp_server_cn = NULL,
*ldap_debug_file = NULL;
static int ldap_port = LDAP_PORT,
ldap_method = LDAP_METHOD_DYNAMIC,
ldap_referrals = -1,
ldap_debug_fd = -1,
ldap_enable_retry = -1,
ldap_init_retry = -1;
#if defined (LDAP_USE_SSL)
static int ldap_use_ssl = -1, /* try TLS if possible */
ldap_tls_reqcert = -1,
ldap_tls_crlcheck = -1;
static char *ldap_tls_ca_file = NULL,
*ldap_tls_ca_dir = NULL,
*ldap_tls_cert = NULL,
*ldap_tls_key = NULL,
*ldap_tls_ciphers = NULL,
*ldap_tls_randfile = NULL;
#endif
#if defined (LDAP_USE_GSSAPI)
static char *ldap_gssapi_keytab = NULL,
*ldap_gssapi_principal = NULL;
struct ldap_sasl_instance {
char *sasl_mech;
char *sasl_realm;
char *sasl_authz_id;
char *sasl_authc_id;
char *sasl_password;
};
static struct ldap_sasl_instance *ldap_sasl_inst = NULL;
static int
_ldap_sasl_interact(LDAP *ld, unsigned flags, void *defaults, void *sin) ;
#endif
static struct ldap_config_stack *ldap_stack = NULL;
typedef struct ldap_dn_node {
struct ldap_dn_node *next;
size_t refs;
char *dn;
} ldap_dn_node;
static ldap_dn_node *ldap_service_dn_head = NULL;
static ldap_dn_node *ldap_service_dn_tail = NULL;
static int ldap_read_function (struct parse *cfile);
static struct parse *
x_parser_init(const char *name)
{
struct parse *cfile;
isc_result_t res;
char *inbuf;
inbuf = dmalloc (LDAP_BUFFER_SIZE, MDL);
if (inbuf == NULL)
return NULL;
cfile = (struct parse *) NULL;
res = new_parse (&cfile, -1, inbuf, LDAP_BUFFER_SIZE, name, 0);
if (res != ISC_R_SUCCESS)
{
dfree(inbuf, MDL);
return NULL;
}
/* the buffer is still empty */
cfile->bufsiz = LDAP_BUFFER_SIZE;
cfile->buflen = cfile->bufix = 0;
/* attach ldap read function */
cfile->read_function = ldap_read_function;
return cfile;
}
static isc_result_t
x_parser_free(struct parse **cfile)
{
if (cfile && *cfile)
{
if ((*cfile)->inbuf)
dfree((*cfile)->inbuf, MDL);
(*cfile)->inbuf = NULL;
(*cfile)->bufsiz = 0;
return end_parse(cfile);
}
return ISC_R_SUCCESS;
}
static int
x_parser_resize(struct parse *cfile, size_t len)
{
size_t size;
char * temp;
/* grow by len rounded up at LDAP_BUFFER_SIZE */
size = cfile->bufsiz + (len | (LDAP_BUFFER_SIZE-1)) + 1;
/* realloc would be better, but there isn't any */
if ((temp = dmalloc (size, MDL)) != NULL)
{
#if defined (DEBUG_LDAP)
log_info ("Reallocated %s buffer from %zu to %zu",
cfile->tlname, cfile->bufsiz, size);
#endif
memcpy(temp, cfile->inbuf, cfile->bufsiz);
dfree(cfile->inbuf, MDL);
cfile->inbuf = temp;
cfile->bufsiz = size;
return 1;
}
/*
* Hmm... what is worser, consider it as fatal error and
* bail out completely or discard config data in hope it
* is "only" an option in dynamic host lookup?
*/
log_error("Unable to reallocated %s buffer from %zu to %zu",
cfile->tlname, cfile->bufsiz, size);
return 0;
}
static char *
x_parser_strcat(struct parse *cfile, const char *str)
{
size_t cur = strlen(cfile->inbuf);
size_t len = strlen(str);
size_t cnt;
if (cur + len >= cfile->bufsiz && !x_parser_resize(cfile, len))
return NULL;
cnt = cfile->bufsiz > cur ? cfile->bufsiz - cur - 1 : 0;
return strncat(cfile->inbuf, str, cnt);
}
static inline void
x_parser_reset(struct parse *cfile)
{
cfile->inbuf[0] = '\0';
cfile->bufix = cfile->buflen = 0;
}
static inline size_t
x_parser_length(struct parse *cfile)
{
cfile->buflen = strlen(cfile->inbuf);
return cfile->buflen;
}
static char *
x_strxform(char *dst, const char *src, size_t dst_size,
int (*xform)(int))
{
if(dst && src && dst_size)
{
size_t len, pos;
len = strlen(src);
for(pos=0; pos < len && pos + 1 < dst_size; pos++)
dst[pos] = xform((int)src[pos]);
dst[pos] = '\0';
return dst;
}
return NULL;
}
static int
get_host_entry(char *fqdnname, size_t fqdnname_size,
char *hostaddr, size_t hostaddr_size)
{
#if defined(MAXHOSTNAMELEN)
char hname[MAXHOSTNAMELEN+1];
#else
char hname[65];
#endif
struct hostent *hp;
if (NULL == fqdnname || 1 >= fqdnname_size)
return -1;
memset(hname, 0, sizeof(hname));
if (gethostname(hname, sizeof(hname)-1))
return -1;
if (NULL == (hp = gethostbyname(hname)))
return -1;
strncpy(fqdnname, hp->h_name, fqdnname_size-1);
fqdnname[fqdnname_size-1] = '\0';
if (hostaddr != NULL)
{
if (hp->h_addr != NULL)
{
struct in_addr *aptr = (struct in_addr *)hp->h_addr;
#if defined(HAVE_INET_NTOP)
if (hostaddr_size >= INET_ADDRSTRLEN &&
inet_ntop(AF_INET, aptr, hostaddr, hostaddr_size) != NULL)
{
return 0;
}
#else
char *astr = inet_ntoa(*aptr);
size_t alen = strlen(astr);
if (astr && alen > 0 && hostaddr_size > alen)
{
strncpy(hostaddr, astr, hostaddr_size-1);
hostaddr[hostaddr_size-1] = '\0';
return 0;
}
#endif
}
return -1;
}
return 0;
}
#if defined(HAVE_IFADDRS_H)
static int
is_iface_address(struct ifaddrs *addrs, struct in_addr *addr)
{
struct ifaddrs *ia;
struct sockaddr_in *sa;
int num = 0;
if(addrs == NULL || addr == NULL)
return -1;
for (ia = addrs; ia != NULL; ia = ia->ifa_next)
{
++num;
if (ia->ifa_addr && (ia->ifa_flags & IFF_UP) &&
ia->ifa_addr->sa_family == AF_INET)
{
sa = (struct sockaddr_in *)(ia->ifa_addr);
if (addr->s_addr == sa->sin_addr.s_addr)
return num;
}
}
return 0;
}
static int
get_host_address(const char *hostname, char *hostaddr, size_t hostaddr_size, struct ifaddrs *addrs)
{
if (hostname && *hostname && hostaddr && hostaddr_size)
{
struct in_addr addr;
#if defined(HAVE_INET_PTON)
if (inet_pton(AF_INET, hostname, &addr) == 1)
#else
if (inet_aton(hostname, &addr) != 0)
#endif
{
/* it is already IP address string */
if(strlen(hostname) < hostaddr_size)
{
strncpy(hostaddr, hostname, hostaddr_size-1);
hostaddr[hostaddr_size-1] = '\0';
if (addrs != NULL && is_iface_address (addrs, &addr) > 0)
return 1;
else
return 0;
}
}
else
{
struct hostent *hp;
if ((hp = gethostbyname(hostname)) != NULL && hp->h_addr != NULL)
{
struct in_addr *aptr = (struct in_addr *)hp->h_addr;
int mret = 0;
if (addrs != NULL)
{
char **h;
for (h=hp->h_addr_list; *h; h++)
{
struct in_addr *haddr = (struct in_addr *)*h;
if (is_iface_address (addrs, haddr) > 0)
{
aptr = haddr;
mret = 1;
}
}
}
#if defined(HAVE_INET_NTOP)
if (hostaddr_size >= INET_ADDRSTRLEN &&
inet_ntop(AF_INET, aptr, hostaddr, hostaddr_size) != NULL)
{
return mret;
}
#else
char *astr = inet_ntoa(*aptr);
size_t alen = strlen(astr);
if (astr && alen > 0 && alen < hostaddr_size)
{
strncpy(hostaddr, astr, hostaddr_size-1);
hostaddr[hostaddr_size-1] = '\0';
return mret;
}
#endif
}
}
}
return -1;
}
#endif /* HAVE_IFADDRS_H */
static void
ldap_parse_class (struct ldap_config_stack *item, struct parse *cfile)
{
struct berval **tempbv;
if ((tempbv = ldap_get_values_len (ld, item->ldent, "cn")) == NULL ||
tempbv[0] == NULL)
{
if (tempbv != NULL)
ldap_value_free_len (tempbv);
return;
}
x_parser_strcat (cfile, "class \"");
x_parser_strcat (cfile, tempbv[0]->bv_val);
x_parser_strcat (cfile, "\" {\n");
item->close_brace = 1;
ldap_value_free_len (tempbv);
}
static int
is_hex_string(const char *str)
{
int colon = 1;
int xdigit = 0;
size_t i;
if (!str)
return 0;
if (*str == '-')
str++;
for (i=0; str[i]; ++i)
{
if (str[i] == ':')
{
xdigit = 0;
if(++colon > 1)
return 0;
}
else if(isxdigit((unsigned char)str[i]))
{
colon = 0;
if (++xdigit > 2)
return 0;
}
else
return 0;
}
return i > 0 && !colon;
}
static void
ldap_parse_subclass (struct ldap_config_stack *item, struct parse *cfile)
{
struct berval **tempbv, **classdata;
char *tmp;
if ((tempbv = ldap_get_values_len (ld, item->ldent, "cn")) == NULL ||
tempbv[0] == NULL)
{
if (tempbv != NULL)
ldap_value_free_len (tempbv);
return;
}
if ((classdata = ldap_get_values_len (ld, item->ldent,
"dhcpClassData")) == NULL ||
classdata[0] == NULL)
{
if (classdata != NULL)
ldap_value_free_len (classdata);
ldap_value_free_len (tempbv);
return;
}
x_parser_strcat (cfile, "subclass \"");
x_parser_strcat (cfile, classdata[0]->bv_val);
if (is_hex_string(tempbv[0]->bv_val))
{
x_parser_strcat (cfile, "\" ");
x_parser_strcat (cfile, tempbv[0]->bv_val);
x_parser_strcat (cfile, " {\n");
}
else
{
tmp = quotify_string(tempbv[0]->bv_val, MDL);
x_parser_strcat (cfile, "\" \"");
x_parser_strcat (cfile, tmp);
x_parser_strcat (cfile, "\" {\n");
dfree(tmp, MDL);
}
item->close_brace = 1;
ldap_value_free_len (tempbv);
ldap_value_free_len (classdata);
}
static void
ldap_parse_host (struct ldap_config_stack *item, struct parse *cfile)
{
struct berval **tempbv, **hwaddr;
if ((tempbv = ldap_get_values_len (ld, item->ldent, "cn")) == NULL ||
tempbv[0] == NULL)
{
if (tempbv != NULL)
ldap_value_free_len (tempbv);
return;
}
hwaddr = ldap_get_values_len (ld, item->ldent, "dhcpHWAddress");
x_parser_strcat (cfile, "host ");
x_parser_strcat (cfile, tempbv[0]->bv_val);
x_parser_strcat (cfile, " {\n");
if (hwaddr != NULL)
{
if (hwaddr[0] != NULL)
{
x_parser_strcat (cfile, "hardware ");
x_parser_strcat (cfile, hwaddr[0]->bv_val);
x_parser_strcat (cfile, ";\n");
}
ldap_value_free_len (hwaddr);
}
item->close_brace = 1;
ldap_value_free_len (tempbv);
}
static void
ldap_parse_shared_network (struct ldap_config_stack *item, struct parse *cfile)
{
struct berval **tempbv;
if ((tempbv = ldap_get_values_len (ld, item->ldent, "cn")) == NULL ||
tempbv[0] == NULL)
{
if (tempbv != NULL)
ldap_value_free_len (tempbv);
return;
}
x_parser_strcat (cfile, "shared-network \"");
x_parser_strcat (cfile, tempbv[0]->bv_val);
x_parser_strcat (cfile, "\" {\n");
item->close_brace = 1;
ldap_value_free_len (tempbv);
}
static void
parse_netmask (int netmask, char *netmaskbuf)
{
unsigned long nm;
int i;
nm = 0;
for (i=1; i <= netmask; i++)
{
nm |= 1 << (32 - i);
}
sprintf (netmaskbuf, "%d.%d.%d.%d", (int) (nm >> 24) & 0xff,
(int) (nm >> 16) & 0xff,
(int) (nm >> 8) & 0xff,
(int) nm & 0xff);
}
static void
ldap_parse_subnet (struct ldap_config_stack *item, struct parse *cfile)
{
struct berval **tempbv, **netmaskstr;
char netmaskbuf[sizeof("255.255.255.255")];
int i;
if ((tempbv = ldap_get_values_len (ld, item->ldent, "cn")) == NULL ||
tempbv[0] == NULL)
{
if (tempbv != NULL)
ldap_value_free_len (tempbv);
return;
}
if ((netmaskstr = ldap_get_values_len (ld, item->ldent,
"dhcpNetmask")) == NULL ||
netmaskstr[0] == NULL)
{
if (netmaskstr != NULL)
ldap_value_free_len (netmaskstr);
ldap_value_free_len (tempbv);
return;
}
x_parser_strcat (cfile, "subnet ");
x_parser_strcat (cfile, tempbv[0]->bv_val);
x_parser_strcat (cfile, " netmask ");
parse_netmask (strtol (netmaskstr[0]->bv_val, NULL, 10), netmaskbuf);
x_parser_strcat (cfile, netmaskbuf);
x_parser_strcat (cfile, " {\n");
ldap_value_free_len (tempbv);
ldap_value_free_len (netmaskstr);
if ((tempbv = ldap_get_values_len (ld, item->ldent, "dhcpRange")) != NULL)
{
for (i=0; tempbv[i] != NULL; i++)
{
x_parser_strcat (cfile, "range");
x_parser_strcat (cfile, " ");
x_parser_strcat (cfile, tempbv[i]->bv_val);
x_parser_strcat (cfile, ";\n");
}
ldap_value_free_len (tempbv);
}
item->close_brace = 1;
}
static void
ldap_parse_subnet6 (struct ldap_config_stack *item, struct parse *cfile)
{
struct berval **tempbv;
int i;
if ((tempbv = ldap_get_values_len (ld, item->ldent, "cn")) == NULL ||
tempbv[0] == NULL)
{
if (tempbv != NULL)
ldap_value_free_len (tempbv);
return;
}
x_parser_strcat (cfile, "subnet6 ");
x_parser_strcat (cfile, tempbv[0]->bv_val);
x_parser_strcat (cfile, " {\n");
ldap_value_free_len (tempbv);
if ((tempbv = ldap_get_values_len (ld, item->ldent, "dhcpRange6")) != NULL)
{
for (i=0; tempbv[i] != NULL; i++)
{
x_parser_strcat (cfile, "range6");
x_parser_strcat (cfile, " ");
x_parser_strcat (cfile, tempbv[i]->bv_val);
x_parser_strcat (cfile, ";\n");
}
ldap_value_free_len (tempbv);
}
if ((tempbv = ldap_get_values_len (ld, item->ldent, "dhcpPermitList")) != NULL)
{
for (i=0; tempbv[i] != NULL; i++)
{
x_parser_strcat (cfile, tempbv[i]->bv_val);
x_parser_strcat (cfile, ";\n");
}
ldap_value_free_len (tempbv);
}
item->close_brace = 1;
}
static void
ldap_parse_pool (struct ldap_config_stack *item, struct parse *cfile)
{
struct berval **tempbv;
int i;
x_parser_strcat (cfile, "pool {\n");
if ((tempbv = ldap_get_values_len (ld, item->ldent, "dhcpRange")) != NULL)
{
x_parser_strcat (cfile, "range");
for (i=0; tempbv[i] != NULL; i++)
{
x_parser_strcat (cfile, " ");
x_parser_strcat (cfile, tempbv[i]->bv_val);
}
x_parser_strcat (cfile, ";\n");
ldap_value_free_len (tempbv);
}
if ((tempbv = ldap_get_values_len (ld, item->ldent, "dhcpPermitList")) != NULL)
{
for (i=0; tempbv[i] != NULL; i++)
{
x_parser_strcat (cfile, tempbv[i]->bv_val);
x_parser_strcat (cfile, ";\n");
}
ldap_value_free_len (tempbv);
}
item->close_brace = 1;
}
static void
ldap_parse_pool6 (struct ldap_config_stack *item, struct parse *cfile)
{
struct berval **tempbv;
int i;
x_parser_strcat (cfile, "pool6 {\n");
if ((tempbv = ldap_get_values_len (ld, item->ldent, "dhcpRange6")) != NULL)
{
x_parser_strcat (cfile, "range6");
for (i=0; tempbv[i] != NULL; i++)
{
x_parser_strcat (cfile, " ");
x_parser_strcat (cfile, tempbv[i]->bv_val);
}
x_parser_strcat (cfile, ";\n");
ldap_value_free_len (tempbv);
}
if ((tempbv = ldap_get_values_len (ld, item->ldent, "dhcpPermitList")) != NULL)
{
for (i=0; tempbv[i] != NULL; i++)
{
x_parser_strcat(cfile, tempbv[i]->bv_val);
x_parser_strcat (cfile, ";\n");
}
ldap_value_free_len (tempbv);
}
item->close_brace = 1;
}
static void
ldap_parse_group (struct ldap_config_stack *item, struct parse *cfile)
{
x_parser_strcat (cfile, "group {\n");
item->close_brace = 1;
}
static void
ldap_parse_key (struct ldap_config_stack *item, struct parse *cfile)
{
struct berval **tempbv;
if ((tempbv = ldap_get_values_len (ld, item->ldent, "cn")) != NULL)
{
x_parser_strcat (cfile, "key ");
x_parser_strcat (cfile, tempbv[0]->bv_val);
x_parser_strcat (cfile, " {\n");
ldap_value_free_len (tempbv);
}
if ((tempbv = ldap_get_values_len (ld, item->ldent, "dhcpKeyAlgorithm")) != NULL)
{
x_parser_strcat (cfile, "algorithm ");
x_parser_strcat (cfile, tempbv[0]->bv_val);
x_parser_strcat (cfile, ";\n");
ldap_value_free_len (tempbv);
}
if ((tempbv = ldap_get_values_len (ld, item->ldent, "dhcpKeySecret")) != NULL)
{
x_parser_strcat (cfile, "secret ");
x_parser_strcat (cfile, tempbv[0]->bv_val);
x_parser_strcat (cfile, ";\n");
ldap_value_free_len (tempbv);
}
item->close_brace = 1;
}
static void
ldap_parse_zone (struct ldap_config_stack *item, struct parse *cfile)
{
char *cnFindStart, *cnFindEnd;
struct berval **tempbv;
char *keyCn;
size_t len;
if ((tempbv = ldap_get_values_len (ld, item->ldent, "cn")) != NULL)
{
x_parser_strcat (cfile, "zone ");
x_parser_strcat (cfile, tempbv[0]->bv_val);
x_parser_strcat (cfile, " {\n");
ldap_value_free_len (tempbv);
}
if ((tempbv = ldap_get_values_len (ld, item->ldent, "dhcpDnsZoneServer")) != NULL)
{
x_parser_strcat (cfile, "primary ");
x_parser_strcat (cfile, tempbv[0]->bv_val);
x_parser_strcat (cfile, ";\n");
ldap_value_free_len (tempbv);
}
if ((tempbv = ldap_get_values_len (ld, item->ldent, "dhcpKeyDN")) != NULL)
{
cnFindStart = strchr(tempbv[0]->bv_val,'=');
if (cnFindStart != NULL)
cnFindEnd = strchr(++cnFindStart,',');
else
cnFindEnd = NULL;
if (cnFindEnd != NULL && cnFindEnd > cnFindStart)
{
len = cnFindEnd - cnFindStart;
keyCn = dmalloc (len + 1, MDL);
}
else
{
len = 0;
keyCn = NULL;
}
if (keyCn != NULL)
{
strncpy (keyCn, cnFindStart, len);
keyCn[len] = '\0';
x_parser_strcat (cfile, "key ");
x_parser_strcat (cfile, keyCn);
x_parser_strcat (cfile, ";\n");
dfree (keyCn, MDL);
}
ldap_value_free_len (tempbv);
}
item->close_brace = 1;
}
#if defined(HAVE_IFADDRS_H)
static void
ldap_parse_failover (struct ldap_config_stack *item, struct parse *cfile)
{
struct berval **tempbv, **peername;
struct ifaddrs *addrs = NULL;
char srvaddr[2][64] = {"\0", "\0"};
int primary, split = 0, match;
if ((peername = ldap_get_values_len (ld, item->ldent, "cn")) == NULL ||
peername[0] == NULL)
{
if (peername != NULL)
ldap_value_free_len (peername);
// ldap with disabled schema checks? fail to avoid syntax error.
log_error("Unable to find mandatory failover peering name attribute");
return;
}
/* Get all interface addresses */
getifaddrs(&addrs);
/*
** when dhcpFailOverPrimaryServer or dhcpFailOverSecondaryServer
** matches one of our IP address, the following valiables are set:
** - primary is 1 when we are primary or 0 when we are secondary
** - srvaddr[0] contains ip address of the primary
** - srvaddr[1] contains ip address of the secondary
*/
primary = -1;
if ((tempbv = ldap_get_values_len (ld, item->ldent, "dhcpFailOverPrimaryServer")) != NULL &&
tempbv[0] != NULL)
{
match = get_host_address (tempbv[0]->bv_val, srvaddr[0], sizeof(srvaddr[0]), addrs);
if (match >= 0)
{
/* we are the primary */
if (match > 0)
primary = 1;
}
else
{
log_info("Can't resolve address of the primary failover '%s' server %s",
peername[0]->bv_val, tempbv[0]->bv_val);
ldap_value_free_len (tempbv);
ldap_value_free_len (peername);
if (addrs)
freeifaddrs(addrs);
return;
}
}
if (tempbv != NULL)
ldap_value_free_len (tempbv);
if ((tempbv = ldap_get_values_len (ld, item->ldent, "dhcpFailOverSecondaryServer")) != NULL &&
tempbv[0] != NULL)
{
match = get_host_address (tempbv[0]->bv_val, srvaddr[1], sizeof(srvaddr[1]), addrs);
if (match >= 0)
{
if (match > 0)
{
if (primary == 1)
{
log_info("Both, primary and secondary failover '%s' server"
" attributes match our local address", peername[0]->bv_val);
ldap_value_free_len (tempbv);
ldap_value_free_len (peername);
if (addrs)
freeifaddrs(addrs);
return;
}
/* we are the secondary */
primary = 0;
}
}
else
{
log_info("Can't resolve address of the secondary failover '%s' server %s",
peername[0]->bv_val, tempbv[0]->bv_val);
ldap_value_free_len (tempbv);
ldap_value_free_len (peername);
if (addrs)
freeifaddrs(addrs);
return;
}
}
if (tempbv != NULL)
ldap_value_free_len (tempbv);
if (primary == -1 || srvaddr[0] == '\0' || srvaddr[1] == '\0')
{
log_error("Could not decide if the server type is primary"
" or secondary for failover peering '%s'.", peername[0]->bv_val);
ldap_value_free_len (peername);
if (addrs)
freeifaddrs(addrs);
return;
}
x_parser_strcat (cfile, "failover peer \"");
x_parser_strcat (cfile, peername[0]->bv_val);
x_parser_strcat (cfile, "\" {\n");
if (primary)
x_parser_strcat (cfile, "primary;\n");
else
x_parser_strcat (cfile, "secondary;\n");
x_parser_strcat (cfile, "address ");
if (primary)
x_parser_strcat (cfile, srvaddr[0]);
else
x_parser_strcat (cfile, srvaddr[1]);
x_parser_strcat (cfile, ";\n");
x_parser_strcat (cfile, "peer address ");
if (primary)
x_parser_strcat (cfile, srvaddr[1]);
else
x_parser_strcat (cfile, srvaddr[0]);
x_parser_strcat (cfile, ";\n");
if ((tempbv = ldap_get_values_len (ld, item->ldent, "dhcpFailOverPrimaryPort")) != NULL &&
tempbv[0] != NULL)
{
if (primary)
x_parser_strcat (cfile, "port ");
else
x_parser_strcat (cfile, "peer port ");
x_parser_strcat (cfile, tempbv[0]->bv_val);
x_parser_strcat (cfile, ";\n");
}
if (tempbv != NULL)
ldap_value_free_len (tempbv);
if ((tempbv = ldap_get_values_len (ld, item->ldent, "dhcpFailOverSecondaryPort")) != NULL &&
tempbv[0] != NULL)
{
if (primary)
x_parser_strcat (cfile, "peer port ");
else
x_parser_strcat (cfile, "port ");
x_parser_strcat (cfile, tempbv[0]->bv_val);
x_parser_strcat (cfile, ";\n");
}
if (tempbv != NULL)
ldap_value_free_len (tempbv);
if ((tempbv = ldap_get_values_len (ld, item->ldent, "dhcpFailOverResponseDelay")) != NULL &&
tempbv[0] != NULL)
{
x_parser_strcat (cfile, "max-response-delay ");
x_parser_strcat (cfile, tempbv[0]->bv_val);
x_parser_strcat (cfile, ";\n");
}
if (tempbv != NULL)
ldap_value_free_len (tempbv);
if ((tempbv = ldap_get_values_len (ld, item->ldent, "dhcpFailOverUnackedUpdates")) != NULL &&
tempbv[0] != NULL)
{
x_parser_strcat (cfile, "max-unacked-updates ");
x_parser_strcat (cfile, tempbv[0]->bv_val);
x_parser_strcat (cfile, ";\n");
}
if (tempbv != NULL)
ldap_value_free_len (tempbv);
if ((tempbv = ldap_get_values_len (ld, item->ldent, "dhcpFailOverLoadBalanceTime")) != NULL &&
tempbv[0] != NULL)
{
x_parser_strcat (cfile, "load balance max seconds ");
x_parser_strcat (cfile, tempbv[0]->bv_val);
x_parser_strcat (cfile, ";\n");
}
if (tempbv != NULL)
ldap_value_free_len (tempbv);
tempbv = NULL;
if (primary &&
(tempbv = ldap_get_values_len (ld, item->ldent, "dhcpMaxClientLeadTime")) != NULL &&
tempbv[0] != NULL)
{
x_parser_strcat (cfile, "mclt ");
x_parser_strcat (cfile, tempbv[0]->bv_val);
x_parser_strcat (cfile, ";\n");
}
if (tempbv != NULL)
ldap_value_free_len (tempbv);
tempbv = NULL;
if (primary &&
(tempbv = ldap_get_values_len (ld, item->ldent, "dhcpFailOverSplit")) != NULL &&
tempbv[0] != NULL)
{
x_parser_strcat (cfile, "split ");
x_parser_strcat (cfile, tempbv[0]->bv_val);
x_parser_strcat (cfile, ";\n");
split = 1;
}
if (tempbv != NULL)
ldap_value_free_len (tempbv);
tempbv = NULL;
if (primary && !split &&
(tempbv = ldap_get_values_len (ld, item->ldent, "dhcpFailOverHashBucketAssignment")) != NULL &&
tempbv[0] != NULL)
{
x_parser_strcat (cfile, "hba ");
x_parser_strcat (cfile, tempbv[0]->bv_val);
x_parser_strcat (cfile, ";\n");
}
if (tempbv != NULL)
ldap_value_free_len (tempbv);
item->close_brace = 1;
}
#endif /* HAVE_IFADDRS_H */
static void
add_to_config_stack (LDAPMessage * res, LDAPMessage * ent)
{
struct ldap_config_stack *ns;
ns = dmalloc (sizeof (*ns), MDL);
if (!ns) {
log_fatal ("no memory for add_to_config_stack()");
}
ns->res = res;
ns->ldent = ent;
ns->close_brace = 0;
ns->processed = 0;
ns->next = ldap_stack;
ldap_stack = ns;
}
static void
ldap_stop()
{
struct sigaction old, new;
if (ld == NULL)
return;
/*
** ldap_unbind after a LDAP_SERVER_DOWN result
** causes a SIGPIPE and dhcpd gets terminated,
** since it doesn't handle it...
*/
new.sa_flags = 0;
new.sa_handler = SIG_IGN;
sigemptyset (&new.sa_mask);
sigaction (SIGPIPE, &new, &old);
ldap_unbind_ext_s (ld, NULL, NULL);
ld = NULL;
sigaction (SIGPIPE, &old, &new);
}
static char *
_do_lookup_dhcp_string_option (struct option_state *options, int option_name)
{
struct option_cache *oc;
struct data_string db;
char *ret;
memset (&db, 0, sizeof (db));
oc = lookup_option (&server_universe, options, option_name);
if (oc &&
evaluate_option_cache (&db, (struct packet*) NULL,
(struct lease *) NULL,
(struct client_state *) NULL, options,
(struct option_state *) NULL,
&global_scope, oc, MDL) &&
db.data != NULL && *db.data != '\0')
{
ret = dmalloc (db.len + 1, MDL);
if (ret == NULL)
log_fatal ("no memory for ldap option %d value", option_name);
memcpy (ret, db.data, db.len);
ret[db.len] = 0;
data_string_forget (&db, MDL);
}
else
ret = NULL;
return (ret);
}
static int
_do_lookup_dhcp_int_option (struct option_state *options, int option_name)
{
struct option_cache *oc;
struct data_string db;
int ret;
memset (&db, 0, sizeof (db));
oc = lookup_option (&server_universe, options, option_name);
if (oc &&
evaluate_option_cache (&db, (struct packet*) NULL,
(struct lease *) NULL,
(struct client_state *) NULL, options,
(struct option_state *) NULL,
&global_scope, oc, MDL) &&
db.data != NULL && *db.data != '\0')
{
ret = strtol ((const char *) db.data, NULL, 10);
data_string_forget (&db, MDL);
}
else
ret = 0;
return (ret);
}
static int
_do_lookup_dhcp_enum_option (struct option_state *options, int option_name)
{
struct option_cache *oc;
struct data_string db;
int ret = -1;
memset (&db, 0, sizeof (db));
oc = lookup_option (&server_universe, options, option_name);
if (oc &&
evaluate_option_cache (&db, (struct packet*) NULL,
(struct lease *) NULL,
(struct client_state *) NULL, options,
(struct option_state *) NULL,
&global_scope, oc, MDL) &&
db.data != NULL && *db.data != '\0')
{
if (db.len == 1)
ret = db.data [0];
else
log_fatal ("invalid option name %d", option_name);
data_string_forget (&db, MDL);
}
else
ret = 0;
return (ret);
}
int
ldap_rebind_cb (LDAP *ld, LDAP_CONST char *url, ber_tag_t request, ber_int_t msgid, void *parms)
{
int ret;
LDAPURLDesc *ldapurl = NULL;
char *who = NULL;
struct berval creds;
log_info("LDAP rebind to '%s'", url);
if ((ret = ldap_url_parse(url, &ldapurl)) != LDAP_SUCCESS)
{
log_error ("Error: Can not parse ldap rebind url '%s': %s",
url, ldap_err2string(ret));
return ret;
}
#if defined (LDAP_USE_SSL)
if (strcasecmp(ldapurl->lud_scheme, "ldaps") == 0)
{
int opt = LDAP_OPT_X_TLS_HARD;
if ((ret = ldap_set_option (ld, LDAP_OPT_X_TLS, &opt)) != LDAP_SUCCESS)
{
log_error ("Error: Cannot init LDAPS session to %s:%d: %s",
ldapurl->lud_host, ldapurl->lud_port, ldap_err2string (ret));
ldap_free_urldesc(ldapurl);
return ret;
}
else
{
log_info ("LDAPS session successfully enabled to %s", ldap_server);
}
}
else
if (strcasecmp(ldapurl->lud_scheme, "ldap") == 0 &&
ldap_use_ssl != LDAP_SSL_OFF)
{
if ((ret = ldap_start_tls_s (ld, NULL, NULL)) != LDAP_SUCCESS)
{
log_error ("Error: Cannot start TLS session to %s:%d: %s",
ldapurl->lud_host, ldapurl->lud_port, ldap_err2string (ret));
ldap_free_urldesc(ldapurl);
return ret;
}
else
{
log_info ("TLS session successfully started to %s:%d",
ldapurl->lud_host, ldapurl->lud_port);
}
}
#endif
#if defined(LDAP_USE_GSSAPI)
if (ldap_gssapi_principal != NULL) {
krb5_get_tgt(ldap_gssapi_principal, ldap_gssapi_keytab);
if ((ret = ldap_sasl_interactive_bind_s(ld, NULL, ldap_sasl_inst->sasl_mech,
NULL, NULL, LDAP_SASL_AUTOMATIC,
_ldap_sasl_interact, ldap_sasl_inst)
) != LDAP_SUCCESS)
{
log_error ("Error: Cannot SASL bind to ldap server %s:%d: %s",
ldap_server, ldap_port, ldap_err2string (ret));
char *msg=NULL;
ldap_get_option( ld, LDAP_OPT_DIAGNOSTIC_MESSAGE, (void*)&msg);
log_error ("\tAdditional info: %s", msg);
ldap_memfree(msg);
ldap_stop();
}
ldap_free_urldesc(ldapurl);
return ret;
}
#endif
if (ldap_username != NULL && *ldap_username != '\0' && ldap_password != NULL)
{
who = ldap_username;
creds.bv_val = strdup(ldap_password);
if (creds.bv_val == NULL)
log_fatal ("Error: Unable to allocate memory to duplicate ldap_password");
creds.bv_len = strlen(ldap_password);
if ((ret = ldap_sasl_bind_s (ld, who, LDAP_SASL_SIMPLE, &creds,
NULL, NULL, NULL)) != LDAP_SUCCESS)
{
log_error ("Error: Cannot login into ldap server %s:%d: %s",
ldapurl->lud_host, ldapurl->lud_port, ldap_err2string (ret));
}
if (creds.bv_val)
free(creds.bv_val);
}
ldap_free_urldesc(ldapurl);
return ret;
}
static int
_do_ldap_retry(int ret, const char *server, int port)
{
static int inform = 1;
if (ldap_enable_retry > 0 && ret == LDAP_SERVER_DOWN && ldap_init_retry > 0)
{
if (inform || (ldap_init_retry % 10) == 0)
{
inform = 0;
log_info ("Can't contact LDAP server %s:%d: retrying for %d sec",
server, port, ldap_init_retry);
}
sleep(1);
return ldap_init_retry--;
}
return 0;
}
static struct berval *
_do_ldap_str2esc_filter_bv(const char *str, ber_len_t len, struct berval *bv_o)
{
struct berval bv_i;
if (!str || !bv_o || (ber_str2bv(str, len, 0, &bv_i) == NULL) ||
(ldap_bv2escaped_filter_value(&bv_i, bv_o) != 0))
return NULL;
return bv_o;
}
static void
ldap_start (void)
{
struct option_state *options;
int ret, version;
char *uri = NULL;
struct berval creds;
#if defined(LDAP_USE_GSSAPI)
char *gssapi_realm = NULL;
char *gssapi_user = NULL;
char *running = NULL;
const char *gssapi_delim = "@";
#endif
if (ld != NULL)
return;
if (ldap_server == NULL)
{
options = NULL;
option_state_allocate (&options, MDL);
execute_statements_in_scope (NULL, NULL, NULL, NULL, NULL,
options, &global_scope, root_group,
NULL, NULL);
ldap_server = _do_lookup_dhcp_string_option (options, SV_LDAP_SERVER);
ldap_dhcp_server_cn = _do_lookup_dhcp_string_option (options,
SV_LDAP_DHCP_SERVER_CN);
ldap_port = _do_lookup_dhcp_int_option (options, SV_LDAP_PORT);
ldap_base_dn = _do_lookup_dhcp_string_option (options, SV_LDAP_BASE_DN);
ldap_method = _do_lookup_dhcp_enum_option (options, SV_LDAP_METHOD);
ldap_debug_file = _do_lookup_dhcp_string_option (options,
SV_LDAP_DEBUG_FILE);
ldap_referrals = _do_lookup_dhcp_enum_option (options, SV_LDAP_REFERRALS);
ldap_init_retry = _do_lookup_dhcp_int_option (options, SV_LDAP_INIT_RETRY);
#if defined (LDAP_USE_SSL)
ldap_use_ssl = _do_lookup_dhcp_enum_option (options, SV_LDAP_SSL);
if( ldap_use_ssl != LDAP_SSL_OFF)
{
ldap_tls_reqcert = _do_lookup_dhcp_enum_option (options, SV_LDAP_TLS_REQCERT);
ldap_tls_ca_file = _do_lookup_dhcp_string_option (options, SV_LDAP_TLS_CA_FILE);
ldap_tls_ca_dir = _do_lookup_dhcp_string_option (options, SV_LDAP_TLS_CA_DIR);
ldap_tls_cert = _do_lookup_dhcp_string_option (options, SV_LDAP_TLS_CERT);
ldap_tls_key = _do_lookup_dhcp_string_option (options, SV_LDAP_TLS_KEY);
ldap_tls_crlcheck = _do_lookup_dhcp_enum_option (options, SV_LDAP_TLS_CRLCHECK);
ldap_tls_ciphers = _do_lookup_dhcp_string_option (options, SV_LDAP_TLS_CIPHERS);
ldap_tls_randfile = _do_lookup_dhcp_string_option (options, SV_LDAP_TLS_RANDFILE);
}
#endif
#if defined (LDAP_USE_GSSAPI)
ldap_gssapi_principal = _do_lookup_dhcp_string_option (options,
SV_LDAP_GSSAPI_PRINCIPAL);
if (ldap_gssapi_principal == NULL) {
log_error("ldap_gssapi_principal is not set,"
"GSSAPI Authentication for LDAP will not be used");
} else {
ldap_gssapi_keytab = _do_lookup_dhcp_string_option (options,
SV_LDAP_GSSAPI_KEYTAB);
if (ldap_gssapi_keytab == NULL) {
log_fatal("ldap_gssapi_keytab must be specified");
}
running = strdup(ldap_gssapi_principal);
if (running == NULL)
log_fatal("Could not allocate memory to duplicate gssapi principal");
gssapi_user = strtok(running, gssapi_delim);
if (!gssapi_user || strlen(gssapi_user) == 0) {
log_fatal ("GSSAPI principal must specify user: user@realm");
}
gssapi_realm = strtok(NULL, gssapi_delim);
if (!gssapi_realm || strlen(gssapi_realm) == 0) {
log_fatal ("GSSAPI principal must specify realm: user@realm");
}
ldap_sasl_inst = malloc(sizeof(struct ldap_sasl_instance));
if (ldap_sasl_inst == NULL)
log_fatal("Could not allocate memory for sasl instance! Can not run!");
ldap_sasl_inst->sasl_mech = ber_strdup("GSSAPI");
if (ldap_sasl_inst->sasl_mech == NULL)
log_fatal("Could not allocate memory to duplicate gssapi mechanism");
ldap_sasl_inst->sasl_realm = ber_strdup(gssapi_realm);
if (ldap_sasl_inst->sasl_realm == NULL)
log_fatal("Could not allocate memory to duplicate gssapi realm");
ldap_sasl_inst->sasl_authz_id = ber_strdup(gssapi_user);
if (ldap_sasl_inst->sasl_authz_id == NULL)
log_fatal("Could not allocate memory to duplicate gssapi user");
ldap_sasl_inst->sasl_authc_id = NULL;
ldap_sasl_inst->sasl_password = NULL; //"" before
free(running);
}
#endif
#if defined (LDAP_CASA_AUTH)
if (!load_uname_pwd_from_miCASA(&ldap_username,&ldap_password))
{
#if defined (DEBUG_LDAP)
log_info ("Authentication credential taken from file");
#endif
#endif
ldap_username = _do_lookup_dhcp_string_option (options, SV_LDAP_USERNAME);
ldap_password = _do_lookup_dhcp_string_option (options, SV_LDAP_PASSWORD);
#if defined (LDAP_CASA_AUTH)
}
#endif
option_state_dereference (&options, MDL);
}
if (ldap_server == NULL || ldap_base_dn == NULL)
{
log_info ("Not searching LDAP since ldap-server, ldap-port and ldap-base-dn were not specified in the config file");
ldap_method = LDAP_METHOD_STATIC;
return;
}
if (ldap_debug_file != NULL && ldap_debug_fd == -1)
{
if ((ldap_debug_fd = open (ldap_debug_file, O_CREAT | O_TRUNC | O_WRONLY,
S_IRUSR | S_IWUSR)) < 0)
log_error ("Error opening debug LDAP log file %s: %s", ldap_debug_file,
strerror (errno));
}
#if defined (DEBUG_LDAP)
log_info ("Connecting to LDAP server %s:%d", ldap_server, ldap_port);
#endif
#if defined (LDAP_USE_SSL)
if (ldap_use_ssl == -1)
{
/*
** There was no "ldap-ssl" option in dhcpd.conf (also not "off").
** Let's try, if we can use an anonymous TLS session without to
** verify the server certificate -- if not continue without TLS.
*/
int opt = LDAP_OPT_X_TLS_ALLOW;
if ((ret = ldap_set_option (NULL, LDAP_OPT_X_TLS_REQUIRE_CERT,
&opt)) != LDAP_SUCCESS)
{
log_error ("Warning: Cannot set LDAP TLS require cert option to 'allow': %s",
ldap_err2string (ret));
}
}
if (ldap_use_ssl != LDAP_SSL_OFF)
{
if (ldap_tls_reqcert != -1)
{
if ((ret = ldap_set_option (NULL, LDAP_OPT_X_TLS_REQUIRE_CERT,
&ldap_tls_reqcert)) != LDAP_SUCCESS)
{
log_error ("Cannot set LDAP TLS require cert option: %s",
ldap_err2string (ret));
}
}
if( ldap_tls_ca_file != NULL)
{
if ((ret = ldap_set_option (NULL, LDAP_OPT_X_TLS_CACERTFILE,
ldap_tls_ca_file)) != LDAP_SUCCESS)
{
log_error ("Cannot set LDAP TLS CA certificate file %s: %s",
ldap_tls_ca_file, ldap_err2string (ret));
}
}
if( ldap_tls_ca_dir != NULL)
{
if ((ret = ldap_set_option (NULL, LDAP_OPT_X_TLS_CACERTDIR,
ldap_tls_ca_dir)) != LDAP_SUCCESS)
{
log_error ("Cannot set LDAP TLS CA certificate dir %s: %s",
ldap_tls_ca_dir, ldap_err2string (ret));
}
}
if( ldap_tls_cert != NULL)
{
if ((ret = ldap_set_option (NULL, LDAP_OPT_X_TLS_CERTFILE,
ldap_tls_cert)) != LDAP_SUCCESS)
{
log_error ("Cannot set LDAP TLS client certificate file %s: %s",
ldap_tls_cert, ldap_err2string (ret));
}
}
if( ldap_tls_key != NULL)
{
if ((ret = ldap_set_option (NULL, LDAP_OPT_X_TLS_KEYFILE,
ldap_tls_key)) != LDAP_SUCCESS)
{
log_error ("Cannot set LDAP TLS certificate key file %s: %s",
ldap_tls_key, ldap_err2string (ret));
}
}
if( ldap_tls_crlcheck != -1)
{
int opt = ldap_tls_crlcheck;
if ((ret = ldap_set_option (NULL, LDAP_OPT_X_TLS_CRLCHECK,
&opt)) != LDAP_SUCCESS)
{
log_error ("Cannot set LDAP TLS crl check option: %s",
ldap_err2string (ret));
}
}
if( ldap_tls_ciphers != NULL)
{
if ((ret = ldap_set_option (NULL, LDAP_OPT_X_TLS_CIPHER_SUITE,
ldap_tls_ciphers)) != LDAP_SUCCESS)
{
log_error ("Cannot set LDAP TLS cipher suite %s: %s",
ldap_tls_ciphers, ldap_err2string (ret));
}
}
if( ldap_tls_randfile != NULL)
{
if ((ret = ldap_set_option (NULL, LDAP_OPT_X_TLS_RANDOM_FILE,
ldap_tls_randfile)) != LDAP_SUCCESS)
{
log_error ("Cannot set LDAP TLS random file %s: %s",
ldap_tls_randfile, ldap_err2string (ret));
}
}
}
#endif
/* enough for 'ldap://+ + hostname + ':' + port number */
uri = malloc(strlen(ldap_server) + 16);
if (uri == NULL)
{
log_error ("Cannot build ldap init URI %s:%d", ldap_server, ldap_port);
return;
}
sprintf(uri, "ldap://%s:%d", ldap_server, ldap_port);
ldap_initialize(&ld, uri);
if (ld == NULL)
{
log_error ("Cannot init ldap session to %s:%d", ldap_server, ldap_port);
return;
}
free(uri);
version = LDAP_VERSION3;
if ((ret = ldap_set_option (ld, LDAP_OPT_PROTOCOL_VERSION, &version)) != LDAP_OPT_SUCCESS)
{
log_error ("Cannot set LDAP version to %d: %s", version,
ldap_err2string (ret));
}
if (ldap_referrals != -1)
{
if ((ret = ldap_set_option (ld, LDAP_OPT_REFERRALS, ldap_referrals ?
LDAP_OPT_ON : LDAP_OPT_OFF)) != LDAP_OPT_SUCCESS)
{
log_error ("Cannot %s LDAP referrals option: %s",
(ldap_referrals ? "enable" : "disable"),
ldap_err2string (ret));
}
}
if ((ret = ldap_set_rebind_proc(ld, ldap_rebind_cb, NULL)) != LDAP_SUCCESS)
{
log_error ("Warning: Cannot set ldap rebind procedure: %s",
ldap_err2string (ret));
}
#if defined (LDAP_USE_SSL)
if (ldap_use_ssl == LDAP_SSL_LDAPS ||
(ldap_use_ssl == LDAP_SSL_ON && ldap_port == LDAPS_PORT))
{
int opt = LDAP_OPT_X_TLS_HARD;
if ((ret = ldap_set_option (ld, LDAP_OPT_X_TLS, &opt)) != LDAP_SUCCESS)
{
log_error ("Error: Cannot init LDAPS session to %s:%d: %s",
ldap_server, ldap_port, ldap_err2string (ret));
ldap_stop();
return;
}
else
{
log_info ("LDAPS session successfully enabled to %s:%d",
ldap_server, ldap_port);
}
}
else if (ldap_use_ssl != LDAP_SSL_OFF)
{
do
{
ret = ldap_start_tls_s (ld, NULL, NULL);
}
while(_do_ldap_retry(ret, ldap_server, ldap_port) > 0);
if (ret != LDAP_SUCCESS)
{
log_error ("Error: Cannot start TLS session to %s:%d: %s",
ldap_server, ldap_port, ldap_err2string (ret));
ldap_stop();
return;
}
else
{
log_info ("TLS session successfully started to %s:%d",
ldap_server, ldap_port);
}
}
#endif
#if defined(LDAP_USE_GSSAPI)
if (ldap_gssapi_principal != NULL) {
krb5_get_tgt(ldap_gssapi_principal, ldap_gssapi_keytab);
if ((ret = ldap_sasl_interactive_bind_s(ld, NULL, ldap_sasl_inst->sasl_mech,
NULL, NULL, LDAP_SASL_AUTOMATIC,
_ldap_sasl_interact, ldap_sasl_inst)
) != LDAP_SUCCESS)
{
log_error ("Error: Cannot SASL bind to ldap server %s:%d: %s",
ldap_server, ldap_port, ldap_err2string (ret));
char *msg=NULL;
ldap_get_option( ld, LDAP_OPT_DIAGNOSTIC_MESSAGE, (void*)&msg);
log_error ("\tAdditional info: %s", msg);
ldap_memfree(msg);
ldap_stop();
return;
}
} else
#endif
if (ldap_username != NULL && *ldap_username != '\0' && ldap_password != NULL)
{
creds.bv_val = strdup(ldap_password);
if (creds.bv_val == NULL)
log_fatal ("Error: Unable to allocate memory to duplicate ldap_password");
creds.bv_len = strlen(ldap_password);
do
{
ret = ldap_sasl_bind_s (ld, ldap_username, LDAP_SASL_SIMPLE,
&creds, NULL, NULL, NULL);
}
while(_do_ldap_retry(ret, ldap_server, ldap_port) > 0);
free(creds.bv_val);
if (ret != LDAP_SUCCESS)
{
log_error ("Error: Cannot login into ldap server %s:%d: %s",
ldap_server, ldap_port, ldap_err2string (ret));
ldap_stop();
return;
}
}
#if defined (DEBUG_LDAP)
log_info ("Successfully logged into LDAP server %s", ldap_server);
#endif
}
static void
parse_external_dns (LDAPMessage * ent)
{
char *search[] = {"dhcpOptionsDN", "dhcpSharedNetworkDN", "dhcpSubnetDN",
"dhcpGroupDN", "dhcpHostDN", "dhcpClassesDN",
"dhcpPoolDN", "dhcpZoneDN", "dhcpFailOverPeerDN", NULL};
/* TODO: dhcpKeyDN can't be added. It is referenced in dhcpDnsZone to
retrive the key name (cn). Adding keyDN will reflect adding a key
declaration inside the zone configuration.
dhcpSubClassesDN cant be added. It is also similar to the above.
Needs schema change.
*/
LDAPMessage * newres, * newent;
struct berval **tempbv;
int i, j, ret;
#if defined (DEBUG_LDAP)
char *dn;
dn = ldap_get_dn (ld, ent);
if (dn != NULL)
{
log_info ("Parsing external DNs for '%s'", dn);
ldap_memfree (dn);
}
#endif
if (ld == NULL)
ldap_start ();
if (ld == NULL)
return;
for (i=0; search[i] != NULL; i++)
{
if ((tempbv = ldap_get_values_len (ld, ent, search[i])) == NULL)
continue;
for (j=0; tempbv[j] != NULL; j++)
{
if (*tempbv[j]->bv_val == '\0')
continue;
if ((ret = ldap_search_ext_s(ld, tempbv[j]->bv_val, LDAP_SCOPE_BASE,
"objectClass=*", NULL, 0, NULL,
NULL, NULL, 0, &newres)) != LDAP_SUCCESS)
{
ldap_value_free_len (tempbv);
ldap_stop();
return;
}
#if defined (DEBUG_LDAP)
log_info ("Adding contents of subtree '%s' to config stack from '%s' reference", tempbv[j]->bv_val, search[i]);
#endif
for (newent = ldap_first_entry (ld, newres);
newent != NULL;
newent = ldap_next_entry (ld, newent))
{
#if defined (DEBUG_LDAP)
dn = ldap_get_dn (ld, newent);
if (dn != NULL)
{
log_info ("Adding LDAP result set starting with '%s' to config stack", dn);
ldap_memfree (dn);
}
#endif
add_to_config_stack (newres, newent);
/* don't free newres here */
}
}
ldap_value_free_len (tempbv);
}
}
static void
free_stack_entry (struct ldap_config_stack *item)
{
struct ldap_config_stack *look_ahead_pointer = item;
int may_free_msg = 1;
while (look_ahead_pointer->next != NULL)
{
look_ahead_pointer = look_ahead_pointer->next;
if (look_ahead_pointer->res == item->res)
{
may_free_msg = 0;
break;
}
}
if (may_free_msg)
ldap_msgfree (item->res);
dfree (item, MDL);
}
static void
next_ldap_entry (struct parse *cfile)
{
struct ldap_config_stack *temp_stack;
if (ldap_stack != NULL && ldap_stack->close_brace)
{
x_parser_strcat (cfile, "}\n");
ldap_stack->close_brace = 0;
}
while (ldap_stack != NULL &&
(ldap_stack->ldent == NULL || ( ldap_stack->processed &&
(ldap_stack->ldent = ldap_next_entry (ld, ldap_stack->ldent)) == NULL)))
{
if (ldap_stack->close_brace)
{
x_parser_strcat (cfile, "}\n");
ldap_stack->close_brace = 0;
}
temp_stack = ldap_stack;
ldap_stack = ldap_stack->next;
free_stack_entry (temp_stack);
}
if (ldap_stack != NULL && ldap_stack->close_brace)
{
x_parser_strcat (cfile, "}\n");
ldap_stack->close_brace = 0;
}
}
static char
check_statement_end (const char *statement)
{
char *ptr;
if (statement == NULL || *statement == '\0')
return ('\0');
/*
** check if it ends with "}", e.g.:
** "zone my.domain. { ... }"
** optionally followed by spaces
*/
ptr = strrchr (statement, '}');
if (ptr != NULL)
{
/* skip following white-spaces */
for (++ptr; isspace ((int)*ptr); ptr++);
/* check if we reached the end */
if (*ptr == '\0')
return ('}'); /* yes, block end */
else
return (*ptr);
}
/*
** this should not happen, but...
** check if it ends with ";", e.g.:
** "authoritative;"
** optionally followed by spaces
*/
ptr = strrchr (statement, ';');
if (ptr != NULL)
{
/* skip following white-spaces */
for (++ptr; isspace ((int)*ptr); ptr++);
/* check if we reached the end */
if (*ptr == '\0')
return (';'); /* ends with a ; */
else
return (*ptr);
}
return ('\0');
}
static isc_result_t
ldap_parse_entry_options (LDAPMessage *ent, struct parse *cfile,
int *lease_limit)
{
struct berval **tempbv;
int i;
if (ent == NULL || cfile == NULL)
return (ISC_R_FAILURE);
if ((tempbv = ldap_get_values_len (ld, ent, "dhcpStatements")) != NULL)
{
for (i=0; tempbv[i] != NULL; i++)
{
if (lease_limit != NULL &&
strncasecmp ("lease limit ", tempbv[i]->bv_val, 12) == 0)
{
*lease_limit = (int) strtol ((tempbv[i]->bv_val) + 12, NULL, 10);
continue;
}
x_parser_strcat (cfile, tempbv[i]->bv_val);
switch((int) check_statement_end (tempbv[i]->bv_val))
{
case '}':
case ';':
x_parser_strcat (cfile, "\n");
break;
default:
x_parser_strcat (cfile, ";\n");
break;
}
}
ldap_value_free_len (tempbv);
}
if ((tempbv = ldap_get_values_len (ld, ent, "dhcpOption")) != NULL)
{
for (i=0; tempbv[i] != NULL; i++)
{
x_parser_strcat (cfile, "option ");
x_parser_strcat (cfile, tempbv[i]->bv_val);
switch ((int) check_statement_end (tempbv[i]->bv_val))
{
case ';':
x_parser_strcat (cfile, "\n");
break;
default:
x_parser_strcat (cfile, ";\n");
break;
}
}
ldap_value_free_len (tempbv);
}
return (ISC_R_SUCCESS);
}
static void
ldap_generate_config_string (struct parse *cfile)
{
struct berval **objectClass;
char *dn;
struct ldap_config_stack *entry;
LDAPMessage * ent, * res, *entfirst, *resfirst;
int i, ignore, found;
int ret, parsedn = 1;
size_t len = cfile->buflen;
if (ld == NULL)
ldap_start ();
if (ld == NULL)
return;
entry = ldap_stack;
if ((objectClass = ldap_get_values_len (ld, entry->ldent,
"objectClass")) == NULL)
return;
entry->processed = 1;
ignore = 0;
found = 1;
for (i=0; objectClass[i] != NULL; i++)
{
if (strcasecmp (objectClass[i]->bv_val, "dhcpSharedNetwork") == 0)
ldap_parse_shared_network (entry, cfile);
else if (strcasecmp (objectClass[i]->bv_val, "dhcpClass") == 0)
ldap_parse_class (entry, cfile);
else if (strcasecmp (objectClass[i]->bv_val, "dhcpSubnet") == 0)
ldap_parse_subnet (entry, cfile);
else if (strcasecmp (objectClass[i]->bv_val, "dhcpSubnet6") == 0)
ldap_parse_subnet6 (entry, cfile);
else if (strcasecmp (objectClass[i]->bv_val, "dhcpPool") == 0)
ldap_parse_pool (entry, cfile);
else if (strcasecmp (objectClass[i]->bv_val, "dhcpPool6") == 0)
ldap_parse_pool6 (entry, cfile);
else if (strcasecmp (objectClass[i]->bv_val, "dhcpGroup") == 0)
ldap_parse_group (entry, cfile);
else if (strcasecmp (objectClass[i]->bv_val, "dhcpTSigKey") == 0)
ldap_parse_key (entry, cfile);
else if (strcasecmp (objectClass[i]->bv_val, "dhcpDnsZone") == 0)
ldap_parse_zone (entry, cfile);
#if defined(HAVE_IFADDRS_H)
else if (strcasecmp (objectClass[i]->bv_val, "dhcpFailOverPeer") == 0)
ldap_parse_failover (entry, cfile);
#endif
else if (strcasecmp (objectClass[i]->bv_val, "dhcpHost") == 0)
{
if (ldap_method == LDAP_METHOD_STATIC)
ldap_parse_host (entry, cfile);
else
{
ignore = 1;
break;
}
}
else if (strcasecmp (objectClass[i]->bv_val, "dhcpSubClass") == 0)
{
if (ldap_method == LDAP_METHOD_STATIC)
ldap_parse_subclass (entry, cfile);
else
{
ignore = 1;
break;
}
}
else
found = 0;
if (found && x_parser_length(cfile) <= len)
{
ignore = 1;
break;
}
}
ldap_value_free_len (objectClass);
if (ignore)
{
next_ldap_entry (cfile);
return;
}
ldap_parse_entry_options(entry->ldent, cfile, NULL);
dn = ldap_get_dn (ld, entry->ldent);
if (dn == NULL)
{
ldap_stop();
return;
}
#if defined(DEBUG_LDAP)
log_info ("Found LDAP entry '%s'", dn);
#endif
if ((ret = ldap_search_ext_s (ld, dn, LDAP_SCOPE_ONELEVEL,
"(!(|(|(objectClass=dhcpTSigKey)(objectClass=dhcpClass)) (objectClass=dhcpFailOverPeer)))",
NULL, 0, NULL, NULL,
NULL, 0, &res)) != LDAP_SUCCESS)
{
ldap_memfree (dn);
ldap_stop();
return;
}
if ((ret = ldap_search_ext_s (ld, dn, LDAP_SCOPE_ONELEVEL,
"(|(|(objectClass=dhcpTSigKey)(objectClass=dhcpClass)) (objectClass=dhcpFailOverPeer))",
NULL, 0, NULL, NULL,
NULL, 0, &resfirst)) != LDAP_SUCCESS)
{
ldap_memfree (dn);
ldap_msgfree (res);
ldap_stop();
return;
}
ldap_memfree (dn);
ent = ldap_first_entry(ld, res);
entfirst = ldap_first_entry(ld, resfirst);
if (ent == NULL && entfirst == NULL)
{
parse_external_dns (entry->ldent);
next_ldap_entry (cfile);
}
if (ent != NULL)
{
add_to_config_stack (res, ent);
parse_external_dns (entry->ldent);
parsedn = 0;
}
else
ldap_msgfree (res);
if (entfirst != NULL)
{
add_to_config_stack (resfirst, entfirst);
if(parsedn)
parse_external_dns (entry->ldent);
}
else
ldap_msgfree (resfirst);
}
static void
ldap_close_debug_fd()
{
if (ldap_debug_fd != -1)
{
close (ldap_debug_fd);
ldap_debug_fd = -1;
}
}
static void
ldap_write_debug (const void *buff, size_t size)
{
if (ldap_debug_fd != -1)
{
if (write (ldap_debug_fd, buff, size) < 0)
{
log_error ("Error writing to LDAP debug file %s: %s."
" Disabling log file.", ldap_debug_file,
strerror (errno));
ldap_close_debug_fd();
}
}
}
static int
ldap_read_function (struct parse *cfile)
{
size_t len;
/* append when in saved state */
if (cfile->saved_state == NULL)
{
cfile->inbuf[0] = '\0';
cfile->bufix = 0;
cfile->buflen = 0;
}
len = cfile->buflen;
while (ldap_stack != NULL && x_parser_length(cfile) <= len)
ldap_generate_config_string (cfile);
if (x_parser_length(cfile) <= len && ldap_stack == NULL)
return (EOF);
if (cfile->buflen > len)
ldap_write_debug (cfile->inbuf + len, cfile->buflen - len);
#if defined (DEBUG_LDAP)
log_info ("Sending config portion '%s'", cfile->inbuf + len);
#endif
return (cfile->inbuf[cfile->bufix++]);
}
static char *
ldap_get_host_name (LDAPMessage * ent)
{
struct berval **name;
char *ret;
ret = NULL;
if ((name = ldap_get_values_len (ld, ent, "cn")) == NULL || name[0] == NULL)
{
if (name != NULL)
ldap_value_free_len (name);
#if defined (DEBUG_LDAP)
ret = ldap_get_dn (ld, ent);
if (ret != NULL)
{
log_info ("Cannot get cn attribute for LDAP entry %s", ret);
ldap_memfree(ret);
}
#endif
return (NULL);
}
ret = dmalloc (strlen (name[0]->bv_val) + 1, MDL);
strcpy (ret, name[0]->bv_val);
ldap_value_free_len (name);
return (ret);
}
isc_result_t
ldap_read_config (void)
{
LDAPMessage * ldres, * hostres, * ent, * hostent;
char hfilter[1024], sfilter[1024], fqdn[257];
char *hostdn;
ldap_dn_node *curr = NULL;
struct parse *cfile;
struct utsname unme;
isc_result_t res;
size_t length;
int ret, cnt;
struct berval **tempbv = NULL;
struct berval bv_o[2];
cfile = x_parser_init("LDAP");
if (cfile == NULL)
return (ISC_R_NOMEMORY);
ldap_enable_retry = 1;
if (ld == NULL)
ldap_start ();
ldap_enable_retry = 0;
if (ld == NULL)
{
x_parser_free(&cfile);
return (ldap_server == NULL ? ISC_R_SUCCESS : ISC_R_FAILURE);
}
uname (&unme);
if (ldap_dhcp_server_cn != NULL)
{
if (_do_ldap_str2esc_filter_bv(ldap_dhcp_server_cn, 0, &bv_o[0]) == NULL)
{
log_error ("Cannot escape ldap filter value %s: %m", ldap_dhcp_server_cn);
x_parser_free(&cfile);
return (ISC_R_FAILURE);
}
snprintf (hfilter, sizeof (hfilter),
"(&(objectClass=dhcpServer)(cn=%s))", bv_o[0].bv_val);
ber_memfree(bv_o[0].bv_val);
}
else
{
if (_do_ldap_str2esc_filter_bv(unme.nodename, 0, &bv_o[0]) == NULL)
{
log_error ("Cannot escape ldap filter value %s: %m", unme.nodename);
x_parser_free(&cfile);
return (ISC_R_FAILURE);
}
*fqdn ='\0';
if(0 == get_host_entry(fqdn, sizeof(fqdn), NULL, 0))
{
if (_do_ldap_str2esc_filter_bv(fqdn, 0, &bv_o[1]) == NULL)
{
log_error ("Cannot escape ldap filter value %s: %m", fqdn);
ber_memfree(bv_o[0].bv_val);
x_parser_free(&cfile);
return (ISC_R_FAILURE);
}
}
// If we have fqdn and it isn't the same as nodename, use it in filter
// otherwise just use nodename
if ((*fqdn) && (strcmp(unme.nodename, fqdn))) {
snprintf (hfilter, sizeof (hfilter),
"(&(objectClass=dhcpServer)(|(cn=%s)(cn=%s)))",
bv_o[0].bv_val, bv_o[1].bv_val);
ber_memfree(bv_o[1].bv_val);
}
else
{
snprintf (hfilter, sizeof (hfilter),
"(&(objectClass=dhcpServer)(cn=%s))",
bv_o[0].bv_val);
}
ber_memfree(bv_o[0].bv_val);
}
ldap_enable_retry = 1;
do
{
hostres = NULL;
ret = ldap_search_ext_s (ld, ldap_base_dn, LDAP_SCOPE_SUBTREE,
hfilter, NULL, 0, NULL, NULL, NULL, 0,
&hostres);
}
while(_do_ldap_retry(ret, ldap_server, ldap_port) > 0);
ldap_enable_retry = 0;
if(ret != LDAP_SUCCESS)
{
log_error ("Cannot find host LDAP entry %s %s",
((ldap_dhcp_server_cn == NULL)?(unme.nodename):(ldap_dhcp_server_cn)), hfilter);
if(NULL != hostres)
ldap_msgfree (hostres);
ldap_stop();
x_parser_free(&cfile);
return (ISC_R_FAILURE);
}
if ((hostent = ldap_first_entry (ld, hostres)) == NULL)
{
log_error ("Error: Cannot find LDAP entry matching %s", hfilter);
ldap_msgfree (hostres);
ldap_stop();
x_parser_free(&cfile);
return (ISC_R_FAILURE);
}
hostdn = ldap_get_dn (ld, hostent);
#if defined(DEBUG_LDAP)
if (hostdn != NULL)
log_info ("Found dhcpServer LDAP entry '%s'", hostdn);
#endif
if (hostdn == NULL ||
(tempbv = ldap_get_values_len (ld, hostent, "dhcpServiceDN")) == NULL ||
tempbv[0] == NULL)
{
log_error ("Error: No dhcp service is associated with the server %s %s",
(hostdn ? "dn" : "name"), (hostdn ? hostdn :
(ldap_dhcp_server_cn ? ldap_dhcp_server_cn : unme.nodename)));
if (tempbv != NULL)
ldap_value_free_len (tempbv);
if (hostdn)
ldap_memfree (hostdn);
ldap_msgfree (hostres);
ldap_stop();
x_parser_free(&cfile);
return (ISC_R_FAILURE);
}
#if defined(DEBUG_LDAP)
log_info ("LDAP: Parsing dhcpServer options '%s' ...", hostdn);
#endif
res = ldap_parse_entry_options(hostent, cfile, NULL);
if (res != ISC_R_SUCCESS)
{
ldap_value_free_len (tempbv);
ldap_msgfree (hostres);
ldap_memfree (hostdn);
ldap_stop();
x_parser_free(&cfile);
return res;
}
if (x_parser_length(cfile) > 0)
{
ldap_write_debug(cfile->inbuf, cfile->buflen);
res = conf_file_subparse (cfile, root_group, ROOT_GROUP);
if (res != ISC_R_SUCCESS)
{
log_error ("LDAP: cannot parse dhcpServer entry '%s'", hostdn);
ldap_value_free_len (tempbv);
ldap_msgfree (hostres);
ldap_memfree (hostdn);
ldap_stop();
x_parser_free(&cfile);
return res;
}
x_parser_reset(cfile);
}
ldap_msgfree (hostres);
res = ISC_R_SUCCESS;
for (cnt=0; tempbv[cnt] != NULL; cnt++)
{
if (_do_ldap_str2esc_filter_bv(hostdn, 0, &bv_o[0]) == NULL)
{
log_error ("Cannot escape ldap filter value %s: %m", hostdn);
res = ISC_R_FAILURE;
break;
}
snprintf(sfilter, sizeof(sfilter), "(&(objectClass=dhcpService)"
"(|(|(dhcpPrimaryDN=%s)(dhcpSecondaryDN=%s))(dhcpServerDN=%s)))",
bv_o[0].bv_val, bv_o[0].bv_val, bv_o[0].bv_val);
ber_memfree(bv_o[0].bv_val);
ldres = NULL;
if ((ret = ldap_search_ext_s (ld, tempbv[cnt]->bv_val, LDAP_SCOPE_BASE,
sfilter, NULL, 0, NULL, NULL, NULL,
0, &ldres)) != LDAP_SUCCESS)
{
log_error ("Error searching for dhcpServiceDN '%s': %s. Please update the LDAP entry '%s'",
tempbv[cnt]->bv_val, ldap_err2string (ret), hostdn);
if(NULL != ldres)
ldap_msgfree(ldres);
res = ISC_R_FAILURE;
break;
}
if ((ent = ldap_first_entry (ld, ldres)) == NULL)
{
log_error ("Error: Cannot find dhcpService DN '%s' with server reference. Please update the LDAP server entry '%s'",
tempbv[cnt]->bv_val, hostdn);
ldap_msgfree(ldres);
res = ISC_R_FAILURE;
break;
}
/*
** FIXME: how to free the remembered dn's on exit?
** This should be OK if dmalloc registers the
** memory it allocated and frees it on exit..
*/
curr = dmalloc (sizeof (*curr), MDL);
if (curr != NULL)
{
length = strlen (tempbv[cnt]->bv_val);
curr->dn = dmalloc (length + 1, MDL);
if (curr->dn == NULL)
{
dfree (curr, MDL);
curr = NULL;
}
else
strcpy (curr->dn, tempbv[cnt]->bv_val);
}
if (curr != NULL)
{
curr->refs++;
/* append to service-dn list */
if (ldap_service_dn_tail != NULL)
ldap_service_dn_tail->next = curr;
else
ldap_service_dn_head = curr;
ldap_service_dn_tail = curr;
}
else
log_fatal ("no memory to remember ldap service dn");
#if defined (DEBUG_LDAP)
log_info ("LDAP: Parsing dhcpService DN '%s' ...", tempbv[cnt]->bv_val);
#endif
add_to_config_stack (ldres, ent);
res = conf_file_subparse (cfile, root_group, ROOT_GROUP);
if (res != ISC_R_SUCCESS)
{
log_error ("LDAP: cannot parse dhcpService entry '%s'", tempbv[cnt]->bv_val);
break;
}
}
x_parser_free(&cfile);
ldap_close_debug_fd();
ldap_memfree (hostdn);
ldap_value_free_len (tempbv);
if (res != ISC_R_SUCCESS)
{
struct ldap_config_stack *temp_stack;
while ((curr = ldap_service_dn_head) != NULL)
{
ldap_service_dn_head = curr->next;
dfree (curr->dn, MDL);
dfree (curr, MDL);
}
ldap_service_dn_tail = NULL;
while ((temp_stack = ldap_stack) != NULL)
{
ldap_stack = temp_stack->next;
free_stack_entry (temp_stack);
}
ldap_stop();
}
/* Unbind from ldap immediately after reading config in static mode. */
if (ldap_method == LDAP_METHOD_STATIC)
ldap_stop();
return (res);
}
/* This function will parse the dhcpOption and dhcpStatements field in the LDAP
entry if it exists. Right now, type will be either HOST_DECL or CLASS_DECL.
If we are parsing a HOST_DECL, this always returns 0. If we are parsing a
CLASS_DECL, this will return what the current lease limit is in LDAP. If
there is no lease limit specified, we return 0 */
static int
ldap_parse_options (LDAPMessage * ent, struct group *group,
int type, struct host_decl *host,
struct class **class)
{
int declaration, lease_limit;
enum dhcp_token token;
struct parse *cfile;
isc_result_t res;
const char *val;
lease_limit = 0;
cfile = x_parser_init(type == HOST_DECL ? "LDAP-HOST" : "LDAP-SUBCLASS");
if (cfile == NULL)
return (lease_limit);
/* This block of code will try to find the parent of the host, and
if it is a group object, fetch the options and apply to the host. */
if (type == HOST_DECL)
{
char *hostdn, *basedn, *temp1, *temp2, filter[1024];
LDAPMessage *groupdn, *entry;
int ret;
hostdn = ldap_get_dn (ld, ent);
if( hostdn != NULL)
{
basedn = NULL;
temp1 = strchr (hostdn, '=');
if (temp1 != NULL)
temp1 = strchr (++temp1, '=');
if (temp1 != NULL)
temp2 = strchr (++temp1, ',');
else
temp2 = NULL;
if (temp2 != NULL)
{
struct berval bv_o;
if (_do_ldap_str2esc_filter_bv(temp1, (temp2 - temp1), &bv_o) == NULL)
{
log_error ("Cannot escape ldap filter value %.*s: %m",
(int)(temp2 - temp1), temp1);
filter[0] = '\0';
}
else
{
snprintf (filter, sizeof(filter),
"(&(cn=%s)(objectClass=dhcpGroup))",
bv_o.bv_val);
ber_memfree(bv_o.bv_val);
}
basedn = strchr (temp1, ',');
if (basedn != NULL)
++basedn;
}
if (basedn != NULL && *basedn != '\0' && filter[0] != '\0')
{
ret = ldap_search_ext_s (ld, basedn, LDAP_SCOPE_SUBTREE, filter,
NULL, 0, NULL, NULL, NULL, 0, &groupdn);
if (ret == LDAP_SUCCESS)
{
if ((entry = ldap_first_entry (ld, groupdn)) != NULL)
{
res = ldap_parse_entry_options (entry, cfile, &lease_limit);
if (res != ISC_R_SUCCESS)
{
/* reset option buffer discarding any results */
x_parser_reset(cfile);
lease_limit = 0;
}
}
ldap_msgfree( groupdn);
}
}
ldap_memfree( hostdn);
}
}
res = ldap_parse_entry_options (ent, cfile, &lease_limit);
if (res != ISC_R_SUCCESS)
{
x_parser_free(&cfile);
return (lease_limit);
}
if (x_parser_length(cfile) == 0)
{
x_parser_free(&cfile);
return (lease_limit);
}
declaration = 0;
do
{
token = peek_token (&val, NULL, cfile);
if (token == END_OF_FILE)
break;
declaration = parse_statement (cfile, group, type, host, declaration);
} while (1);
x_parser_free(&cfile);
return (lease_limit);
}
int
find_haddr_in_ldap (struct host_decl **hp, int htype, unsigned hlen,
const unsigned char *haddr, const char *file, int line)
{
char buf[128], *type_str;
LDAPMessage * res, *ent;
struct host_decl * host;
isc_result_t status;
ldap_dn_node *curr;
char up_hwaddr[20];
char lo_hwaddr[20];
int ret;
struct berval bv_o[2];
*hp = NULL;
if (ldap_method == LDAP_METHOD_STATIC)
return (0);
if (ld == NULL)
ldap_start ();
if (ld == NULL)
return (0);
switch (htype)
{
case HTYPE_ETHER:
type_str = "ethernet";
break;
case HTYPE_IEEE802:
type_str = "token-ring";
break;
case HTYPE_FDDI:
type_str = "fddi";
break;
default:
log_info ("Ignoring unknown type %d", htype);
return (0);
}
/*
** FIXME: It is not guaranteed, that the dhcpHWAddress attribute
** contains _exactly_ "type addr" with one space between!
*/
snprintf(lo_hwaddr, sizeof(lo_hwaddr), "%s",
print_hw_addr (htype, hlen, haddr));
x_strxform(up_hwaddr, lo_hwaddr, sizeof(up_hwaddr), toupper);
if (_do_ldap_str2esc_filter_bv(lo_hwaddr, 0, &bv_o[0]) == NULL)
{
log_error ("Cannot escape ldap filter value %s: %m", lo_hwaddr);
return (0);
}
if (_do_ldap_str2esc_filter_bv(up_hwaddr, 0, &bv_o[1]) == NULL)
{
log_error ("Cannot escape ldap filter value %s: %m", up_hwaddr);
ber_memfree(bv_o[0].bv_val);
return (0);
}
snprintf (buf, sizeof (buf),
"(&(objectClass=dhcpHost)(|(dhcpHWAddress=%s %s)(dhcpHWAddress=%s %s)))",
type_str, bv_o[0].bv_val, type_str, bv_o[1].bv_val);
ber_memfree(bv_o[0].bv_val);
ber_memfree(bv_o[1].bv_val);
res = ent = NULL;
for (curr = ldap_service_dn_head;
curr != NULL && *curr->dn != '\0';
curr = curr->next)
{
#if defined (DEBUG_LDAP)
log_info ("Searching for %s in LDAP tree %s", buf, curr->dn);
#endif
ret = ldap_search_ext_s (ld, curr->dn, LDAP_SCOPE_SUBTREE, buf, NULL, 0,
NULL, NULL, NULL, 0, &res);
if(ret == LDAP_SERVER_DOWN)
{
log_info ("LDAP server was down, trying to reconnect...");
ldap_stop();
ldap_start();
if(ld == NULL)
{
log_info ("LDAP reconnect failed - try again later...");
return (0);
}
ret = ldap_search_ext_s (ld, curr->dn, LDAP_SCOPE_SUBTREE, buf, NULL,
0, NULL, NULL, NULL, 0, &res);
}
if (ret == LDAP_SUCCESS)
{
ent = ldap_first_entry (ld, res);
#if defined (DEBUG_LDAP)
if (ent == NULL) {
log_info ("No host entry for %s in LDAP tree %s",
buf, curr->dn);
}
#endif
while (ent != NULL) {
#if defined (DEBUG_LDAP)
char *dn = ldap_get_dn (ld, ent);
if (dn != NULL)
{
log_info ("Found dhcpHWAddress LDAP entry %s", dn);
ldap_memfree(dn);
}
#endif
host = (struct host_decl *)0;
status = host_allocate (&host, MDL);
if (status != ISC_R_SUCCESS)
{
log_fatal ("can't allocate host decl struct: %s",
isc_result_totext (status));
ldap_msgfree (res);
return (0);
}
host->name = ldap_get_host_name (ent);
if (host->name == NULL)
{
host_dereference (&host, MDL);
ldap_msgfree (res);
return (0);
}
if (!clone_group (&host->group, root_group, MDL))
{
log_fatal ("can't clone group for host %s", host->name);
host_dereference (&host, MDL);
ldap_msgfree (res);
return (0);
}
ldap_parse_options (ent, host->group, HOST_DECL, host, NULL);
host->n_ipaddr = *hp;
*hp = host;
ent = ldap_next_entry (ld, ent);
}
if(res)
{
ldap_msgfree (res);
res = NULL;
}
return (*hp != NULL);
}
else
{
if(res)
{
ldap_msgfree (res);
res = NULL;
}
if (ret != LDAP_NO_SUCH_OBJECT && ret != LDAP_SUCCESS)
{
log_error ("Cannot search for %s in LDAP tree %s: %s", buf,
curr->dn, ldap_err2string (ret));
ldap_stop();
return (0);
}
#if defined (DEBUG_LDAP)
else
{
log_info ("ldap_search_ext_s returned %s when searching for %s in %s",
ldap_err2string (ret), buf, curr->dn);
}
#endif
}
}
return (0);
}
int
find_subclass_in_ldap (struct class *class, struct class **newclass,
struct data_string *data)
{
LDAPMessage * res, * ent;
int ret, lease_limit;
isc_result_t status;
ldap_dn_node *curr;
char buf[2048];
struct berval bv_class;
struct berval bv_cdata;
char *hex_1;
if (ldap_method == LDAP_METHOD_STATIC)
return (0);
if (ld == NULL)
ldap_start ();
if (ld == NULL)
return (0);
hex_1 = print_hex_1 (data->len, data->data, 1024);
if (*hex_1 == '"')
{
/* result is a quotted not hex string: ldap escape the original string */
if (_do_ldap_str2esc_filter_bv((const char*)data->data, data->len, &bv_cdata) == NULL)
{
log_error ("Cannot escape ldap filter value %s: %m", hex_1);
return (0);
}
hex_1 = NULL;
}
if (_do_ldap_str2esc_filter_bv(class->name, strlen (class->name), &bv_class) == NULL)
{
log_error ("Cannot escape ldap filter value %s: %m", class->name);
if (hex_1 == NULL)
ber_memfree(bv_cdata.bv_val);
return (0);
}
snprintf (buf, sizeof (buf),
"(&(objectClass=dhcpSubClass)(cn=%s)(dhcpClassData=%s))",
(hex_1 == NULL ? bv_cdata.bv_val : hex_1), bv_class.bv_val);
if (hex_1 == NULL)
ber_memfree(bv_cdata.bv_val);
ber_memfree(bv_class.bv_val);
#if defined (DEBUG_LDAP)
log_info ("Searching LDAP for %s", buf);
#endif
res = ent = NULL;
for (curr = ldap_service_dn_head;
curr != NULL && *curr->dn != '\0';
curr = curr->next)
{
#if defined (DEBUG_LDAP)
log_info ("Searching for %s in LDAP tree %s", buf, curr->dn);
#endif
ret = ldap_search_ext_s (ld, curr->dn, LDAP_SCOPE_SUBTREE, buf, NULL, 0,
NULL, NULL, NULL, 0, &res);
if(ret == LDAP_SERVER_DOWN)
{
log_info ("LDAP server was down, trying to reconnect...");
ldap_stop();
ldap_start();
if(ld == NULL)
{
log_info ("LDAP reconnect failed - try again later...");
return (0);
}
ret = ldap_search_ext_s (ld, curr->dn, LDAP_SCOPE_SUBTREE, buf,
NULL, 0, NULL, NULL, NULL, 0, &res);
}
if (ret == LDAP_SUCCESS)
{
if( (ent = ldap_first_entry (ld, res)) != NULL)
break; /* search OK and have entry */
#if defined (DEBUG_LDAP)
log_info ("No subclass entry for %s in LDAP tree %s",
buf, curr->dn);
#endif
if(res)
{
ldap_msgfree (res);
res = NULL;
}
}
else
{
if(res)
{
ldap_msgfree (res);
res = NULL;
}
if (ret != LDAP_NO_SUCH_OBJECT && ret != LDAP_SUCCESS)
{
log_error ("Cannot search for %s in LDAP tree %s: %s", buf,
curr->dn, ldap_err2string (ret));
ldap_stop();
return (0);
}
#if defined (DEBUG_LDAP)
else
{
log_info ("ldap_search_ext_s returned %s when searching for %s in %s",
ldap_err2string (ret), buf, curr->dn);
}
#endif
}
}
if (res && ent)
{
#if defined (DEBUG_LDAP)
char *dn = ldap_get_dn (ld, ent);
if (dn != NULL)
{
log_info ("Found subclass LDAP entry %s", dn);
ldap_memfree(dn);
}
#endif
status = class_allocate (newclass, MDL);
if (status != ISC_R_SUCCESS)
{
log_error ("Cannot allocate memory for a new class");
ldap_msgfree (res);
return (0);
}
group_reference (&(*newclass)->group, class->group, MDL);
class_reference (&(*newclass)->superclass, class, MDL);
lease_limit = ldap_parse_options (ent, (*newclass)->group,
CLASS_DECL, NULL, newclass);
if (lease_limit == 0)
(*newclass)->lease_limit = class->lease_limit;
else
class->lease_limit = lease_limit;
if ((*newclass)->lease_limit)
{
(*newclass)->billed_leases =
dmalloc ((*newclass)->lease_limit * sizeof (struct lease *), MDL);
if (!(*newclass)->billed_leases)
{
log_error ("no memory for billing");
class_dereference (newclass, MDL);
ldap_msgfree (res);
return (0);
}
memset ((*newclass)->billed_leases, 0,
((*newclass)->lease_limit * sizeof (struct lease *)));
}
data_string_copy (&(*newclass)->hash_string, data, MDL);
ldap_msgfree (res);
return (1);
}
if(res) ldap_msgfree (res);
return (0);
}
int find_client_in_ldap (struct host_decl **hp, struct packet *packet,
struct option_state *state, const char *file, int line)
{
LDAPMessage * res, * ent;
ldap_dn_node *curr;
struct host_decl * host;
isc_result_t status;
struct data_string client_id;
char buf[1024], buf1[1024];
int ret;
if (ldap_method == LDAP_METHOD_STATIC)
return (0);
if (ld == NULL)
ldap_start ();
if (ld == NULL)
return (0);
memset(&client_id, 0, sizeof(client_id));
if (get_client_id(packet, &client_id) != ISC_R_SUCCESS)
return (0);
snprintf(buf, sizeof(buf),
"(&(objectClass=dhcpHost)(dhcpClientId=%s))",
print_hw_addr(0, client_id.len, client_id.data));
/* log_info ("Searching LDAP for %s (%s)", buf, packet->interface->shared_network->name); */
res = ent = NULL;
for (curr = ldap_service_dn_head;
curr != NULL && *curr->dn != '\0';
curr = curr->next)
{
snprintf(buf1, sizeof(buf1), "cn=%s,%s", packet->interface->shared_network->name, curr->dn);
#if defined (DEBUG_LDAP)
log_info ("Searching for %s in LDAP tree %s", buf, buf1);
#endif
ret = ldap_search_ext_s (ld, buf1, LDAP_SCOPE_SUBTREE, buf, NULL, 0,
NULL, NULL, NULL, 0, &res);
if(ret == LDAP_SERVER_DOWN)
{
log_info ("LDAP server was down, trying to reconnect...");
ldap_stop();
ldap_start();
if(ld == NULL)
{
log_info ("LDAP reconnect failed - try again later...");
return (0);
}
ret = ldap_search_ext_s (ld, buf1, LDAP_SCOPE_SUBTREE, buf,
NULL, 0, NULL, NULL, NULL, 0, &res);
}
if (ret == LDAP_SUCCESS)
{
if( (ent = ldap_first_entry (ld, res)) != NULL) {
log_info ("found entry in search %s", buf1);
break; /* search OK and have entry */
}
#if defined (DEBUG_LDAP)
log_info ("No subclass entry for %s in LDAP tree %s", buf, curr->dn);
#endif
if(res)
{
ldap_msgfree (res);
res = NULL;
}
}
else
{
if(res)
{
ldap_msgfree (res);
res = NULL;
}
if (ret != LDAP_NO_SUCH_OBJECT && ret != LDAP_SUCCESS)
{
log_error ("Cannot search for %s in LDAP tree %s: %s", buf,
curr->dn, ldap_err2string (ret));
ldap_stop();
return (0);
}
else
{
log_info ("did not find: %s", buf);
}
}
}
if (res && ent)
{
#if defined (DEBUG_LDAP)
log_info ("ldap_get_dn %s", curr->dn);
char *dn = ldap_get_dn (ld, ent);
if (dn != NULL)
{
log_info ("Found subclass LDAP entry %s", dn);
ldap_memfree(dn);
} else {
log_info ("DN is null %s", dn);
}
#endif
host = (struct host_decl *)0;
status = host_allocate (&host, MDL);
if (status != ISC_R_SUCCESS)
{
log_fatal ("can't allocate host decl struct: %s",
isc_result_totext (status));
ldap_msgfree (res);
return (0);
}
host->name = ldap_get_host_name (ent);
if (host->name == NULL)
{
host_dereference (&host, MDL);
ldap_msgfree (res);
return (0);
}
/* log_info ("Host name %s", host->name); */
if (!clone_group (&host->group, root_group, MDL))
{
log_fatal ("can't clone group for host %s", host->name);
host_dereference (&host, MDL);
ldap_msgfree (res);
return (0);
}
ldap_parse_options (ent, host->group, HOST_DECL, host, NULL);
*hp = host;
ldap_msgfree (res);
return (1);
}
else
{
log_info ("did not find clientid: %s", buf);
}
if(res) ldap_msgfree (res);
return (0);
}
#if defined(LDAP_USE_GSSAPI)
static int
_ldap_sasl_interact(LDAP *ld, unsigned flags, void *defaults, void *sin)
{
sasl_interact_t *in;
struct ldap_sasl_instance *ldap_inst = defaults;
int ret = LDAP_OTHER;
size_t size;
if (ld == NULL || sin == NULL)
return LDAP_PARAM_ERROR;
log_info("doing interactive bind");
for (in = sin; in != NULL && in->id != SASL_CB_LIST_END; in++) {
switch (in->id) {
case SASL_CB_USER:
log_info("got request for SASL_CB_USER %s", ldap_inst->sasl_authz_id);
size = strlen(ldap_inst->sasl_authz_id);
in->result = ldap_inst->sasl_authz_id;
in->len = size;
ret = LDAP_SUCCESS;
break;
case SASL_CB_GETREALM:
log_info("got request for SASL_CB_GETREALM %s", ldap_inst->sasl_realm);
size = strlen(ldap_inst->sasl_realm);
in->result = ldap_inst->sasl_realm;
in->len = size;
ret = LDAP_SUCCESS;
break;
case SASL_CB_AUTHNAME:
log_info("got request for SASL_CB_AUTHNAME %s", ldap_inst->sasl_authc_id);
size = strlen(ldap_inst->sasl_authc_id);
in->result = ldap_inst->sasl_authc_id;
in->len = size;
ret = LDAP_SUCCESS;
break;
case SASL_CB_PASS:
log_info("got request for SASL_CB_PASS %s", ldap_inst->sasl_password);
size = strlen(ldap_inst->sasl_password);
in->result = ldap_inst->sasl_password;
in->len = size;
ret = LDAP_SUCCESS;
break;
default:
goto cleanup;
}
}
return ret;
cleanup:
in->result = NULL;
in->len = 0;
return LDAP_OTHER;
}
#endif /* LDAP_USE_GSSAPI */
#endif