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mod_ldap.c
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mod_ldap.c
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/*
* mod_ldap - LDAP password lookup module for ProFTPD
* Copyright (c) 1999-2013, John Morrissey <[email protected]>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Suite 500, Boston, MA 02110-1335, USA.
*
* Furthermore, John Morrissey gives permission to link this program with
* OpenSSL, and distribute the resulting executable, without including the
* source code for OpenSSL in the source distribution.
*/
/* Thanks for patches go to (in alphabetical order):
*
* Peter Fabian (fabian at staff dot matavnet dot hu) - LDAPAuthBinds
* Alexandre Francois (alexandre-francois at voila dot fr) - LDAPAliasDereference
* Marek Gradzki (mgradzki at ost dot net dot pl) - LDAPProtocolVersion
* Pierrick Hascoet (pierrick at alias dot fr) - OpenSSL password hash support
* Florian Lohoff (flo at rfc822 dot org) - LDAPForceDefault[UG]ID code
* Steve Luzynski (steve at uniteone dot net) - HomedirOnDemandPrefix support
* Gaute Nessan (gaute at kpnqwest dot no) - OpenLDAP 2.0 fixes
* Marcin Obara (gryzzli at wp-sa dot pl) - User/group caching code, Sun
* LDAP library portability fixes
* Phil Oester (phil at theoesters dot com) - Group code memory manip fixes
* Michael Schout (mschout at gkg dot net) - Full-path HomedirOnDemand and
* multiple-HomedirOnDemandSuffix
* support
* Klaus Steinberger (klaus dot steinberger at physik dot uni-muenchen dot de)
* - LDAPForceHomedirOnDemand support
* Andreas Strodl (andreas at strodl dot org) - multiple group support
* Ross Thomas (ross at grinfinity dot com) - Non-AuthBinds auth fix
* Ivo Timmermans (ivo at debian dot org) - TLS support
* Bert Vermeulen (bert at be dot easynet dot net) - LDAPHomedirOnDemand,
* LDAPDefaultAuthScheme
*
*
* $Id$
* $Libraries: -lldap -llber$
*/
#include "conf.h"
#include "privs.h"
#define MOD_LDAP_VERSION "mod_ldap/2.9.3"
#if PROFTPD_VERSION_NUMBER < 0x0001030103
# error MOD_LDAP_VERSION " requires ProFTPD 1.3.1rc3 or later"
#endif
#if defined(HAVE_CRYPT_H) && !defined(AIX4) && !defined(AIX5)
# include <crypt.h>
#endif
#include <ctype.h> /* isdigit() */
#include <errno.h>
#include <lber.h>
#include <ldap.h>
#if LDAP_API_VERSION >= 2000
# define HAS_LDAP_SASL_BIND_S
#endif
#if defined(LDAP_API_FEATURE_X_OPENLDAP) && (LDAP_VENDOR_VERSION >= 192)
# define HAS_LDAP_UNBIND_EXT_S
#endif
#if defined(LDAP_API_FEATURE_X_OPENLDAP) && (LDAP_VENDOR_VERSION >= 19905)
# define HAS_LDAP_INITIALIZE
#endif
#ifdef HAS_LDAP_UNBIND_EXT_S
# define LDAP_UNBIND(ld) (ldap_unbind_ext_s(ld, NULL, NULL))
#else
# define LDAP_UNBIND(ld) (ldap_unbind_s(ld))
static char *ldap_server;
static int ldap_port = LDAP_PORT;
#endif
#if LDAP_API_VERSION >= 2000
# define LDAP_VALUE_T struct berval
# define LDAP_GET_VALUES(ld, entry, attr) ldap_get_values_len(ld, entry, attr)
# define LDAP_VALUE(values, i) (values[i]->bv_val)
# define LDAP_COUNT_VALUES(values) (ldap_count_values_len(values))
# define LDAP_VALUE_FREE(values) (ldap_value_free_len(values))
# define LDAP_SEARCH(ld, base, scope, filter, attrs, timeout, sizelimit, res) \
ldap_search_ext_s(ld, base, scope, filter, attrs, 0, NULL, NULL, \
timeout, sizelimit, res)
#else /* LDAP_API_VERSION >= 2000 */
# define LDAP_VALUE_T char
# define LDAP_GET_VALUES(ld, entry, attr) ldap_get_values(ld, entry, attr)
# define LDAP_VALUE(values, i) (values[i])
# define LDAP_COUNT_VALUES(values) (ldap_count_values(values))
# define LDAP_VALUE_FREE(values) (ldap_value_free(values))
static void
pr_ldap_set_sizelimit(LDAP *limit_ld, int limit)
{
#ifdef LDAP_OPT_SIZELIMIT
int ret;
ret = ldap_set_option(limit_ld, LDAP_OPT_SIZELIMIT, (void *)&limit);
if (ret != LDAP_OPT_SUCCESS) {
pr_log_pri(PR_LOG_ERR, MOD_LDAP_VERSION ": pr_ldap_set_sizelimit(): ldap_set_option() unable to set query size limit to %d entries: %s", limit, ldap_err2string(ret));
}
#else
limit_ld->ld_sizelimit = limit;
#endif
pr_log_debug(DEBUG3, MOD_LDAP_VERSION ": set search size limit to %d", limit);
}
static int
LDAP_SEARCH(LDAP *ld, char *base, int scope, char *filter, char *attrs[],
struct timeval *timeout, int sizelimit, LDAPMessage **res)
{
pr_ldap_set_sizelimit(ld, sizelimit);
return ldap_search_st(ld, base, scope, filter, attrs, 0, timeout, res);
}
#endif /* LDAP_API_VERSION >= 2000 */
/* Thanks, Sun. */
#ifndef LDAP_OPT_SUCCESS
# define LDAP_OPT_SUCCESS LDAP_SUCCESS
#endif
#ifndef LDAP_URL_SUCCESS
# define LDAP_URL_SUCCESS LDAP_SUCCESS
#endif
#ifndef LDAP_SCOPE_DEFAULT
# define LDAP_SCOPE_DEFAULT LDAP_SCOPE_SUBTREE
#endif
/* Config entries */
static array_header *ldap_servers = NULL;
static unsigned int cur_server_index = 0;
static char *ldap_dn, *ldap_dnpass,
*ldap_user_basedn, *ldap_user_name_filter,
*ldap_user_uid_filter,
*ldap_gid_basedn, *ldap_group_gid_filter,
*ldap_group_name_filter, *ldap_group_member_filter,
*ldap_defaultauthscheme = "crypt", *ldap_authbind_dn,
*ldap_genhdir_prefix, *ldap_default_quota,
*ldap_attr_uid = "uid",
*ldap_attr_uidnumber = "uidNumber",
*ldap_attr_gidnumber = "gidNumber",
*ldap_attr_homedirectory = "homeDirectory",
*ldap_attr_userpassword = "userPassword",
*ldap_attr_loginshell = "loginShell",
*ldap_attr_cn = "cn",
*ldap_attr_memberuid = "memberUid",
*ldap_attr_ftpquota = "ftpQuota",
*ldap_attr_ftpquota_profiledn = "ftpQuotaProfileDN",
*ldap_attr_ssh_pubkey = "sshPublicKey";
#ifdef HAS_LDAP_INITIALIZE
static char *ldap_server_url;
#endif /* HAS_LDAP_INITIALIZE */
static int ldap_do_users = 0, ldap_do_groups = 0,
ldap_authbinds = 1, ldap_querytimeout = 0,
ldap_genhdir = 0, ldap_genhdir_prefix_nouname = 0,
ldap_forcedefaultuid = 0, ldap_forcedefaultgid = 0,
ldap_forcegenhdir = 0, ldap_protocol_version = 3,
ldap_dereference = LDAP_DEREF_NEVER,
ldap_search_scope = LDAP_SCOPE_SUBTREE;
static struct timeval ldap_querytimeout_tp;
static uid_t ldap_defaultuid = -1;
static gid_t ldap_defaultgid = -1;
#ifdef LDAP_OPT_X_TLS
static int ldap_use_tls = 0;
#endif
static LDAP *ld = NULL;
static array_header *cached_quota = NULL;
static array_header *cached_ssh_pubkeys = NULL;
static void
pr_ldap_unbind(void)
{
int ret;
if (!ld) {
pr_log_debug(DEBUG3, MOD_LDAP_VERSION ": not unbinding to an already unbound connection.");
return;
}
ret = LDAP_UNBIND(ld);
if (ret != LDAP_SUCCESS) {
pr_log_pri(PR_LOG_NOTICE, MOD_LDAP_VERSION ": pr_ldap_unbind(): unbind failed: %s", ldap_err2string(ret));
} else {
pr_log_debug(DEBUG3, MOD_LDAP_VERSION ": successfully unbound");
}
ld = NULL;
}
static int
_ldap_connect(LDAP **conn_ld, int do_bind)
{
int ret, version;
#ifdef HAS_LDAP_SASL_BIND_S
struct berval bindcred;
#endif
#ifdef HAS_LDAP_INITIALIZE
pr_log_debug(DEBUG3, MOD_LDAP_VERSION ": attempting connection to %s", ldap_server_url ? ldap_server_url : "(null)");
ret = ldap_initialize(conn_ld, ldap_server_url);
if (ret != LDAP_SUCCESS) {
pr_log_pri(PR_LOG_ERR, MOD_LDAP_VERSION ": pr_ldap_connect(): ldap_initialize() to %s failed: %s", ldap_server_url ? ldap_server_url : "(null)", ldap_err2string(ret));
++cur_server_index;
if (cur_server_index >= ldap_servers->nelts) {
cur_server_index = 0;
}
*conn_ld = NULL;
return -1;
}
#else /* HAS_LDAP_INITIALIZE */
pr_log_debug(DEBUG3, MOD_LDAP_VERSION ": attempting connection to %s:%d", ldap_server ? ldap_server : "(null)", ldap_port);
*conn_ld = ldap_init(ldap_server, ldap_port);
if (!conn_ld) {
pr_log_pri(PR_LOG_ERR, MOD_LDAP_VERSION ": pr_ldap_connect(): ldap_init() to %s:%d failed: %s", ldap_server ? ldap_server : "(null)", ldap_port, strerror(errno));
return -1;
}
#endif /* HAS_LDAP_INITIALIZE */
version = LDAP_VERSION3;
if (ldap_protocol_version == 2) {
version = LDAP_VERSION2;
}
ret = ldap_set_option(*conn_ld, LDAP_OPT_PROTOCOL_VERSION, &version);
if (ret != LDAP_OPT_SUCCESS) {
pr_log_pri(PR_LOG_ERR, MOD_LDAP_VERSION ": pr_ldap_connect(): Setting LDAP version option failed: %s", ldap_err2string(ret));
pr_ldap_unbind();
return -1;
}
pr_log_debug(DEBUG3, MOD_LDAP_VERSION ": set protocol version to %d", version);
#ifdef HAS_LDAP_INITIALIZE
pr_log_debug(DEBUG3, MOD_LDAP_VERSION ": connected to %s", ldap_server_url ? ldap_server_url : "(null)");
#else /* HAS_LDAP_INITIALIZE */
pr_log_debug(DEBUG3, MOD_LDAP_VERSION ": connected to %s:%d", ldap_server ? ldap_server : "(null)", ldap_port);
#endif /* HAS_LDAP_INITIALIZE */
#ifdef LDAP_OPT_X_TLS
if (ldap_use_tls == 1) {
ret = ldap_start_tls_s(*conn_ld, NULL, NULL);
if (ret != LDAP_SUCCESS) {
pr_log_pri(PR_LOG_ERR, MOD_LDAP_VERSION ": pr_ldap_connect(): Starting TLS failed: %s", ldap_err2string(ret));
pr_ldap_unbind();
return -1;
}
pr_log_debug(DEBUG3, MOD_LDAP_VERSION ": enabled TLS.");
}
#endif /* LDAP_OPT_X_TLS */
if (do_bind == TRUE) {
#ifdef HAS_LDAP_SASL_BIND_S
bindcred.bv_val = ldap_dnpass;
bindcred.bv_len = ldap_dnpass != NULL ? strlen(ldap_dnpass) : 0;
ret = ldap_sasl_bind_s(*conn_ld, ldap_dn, NULL, &bindcred, NULL, NULL, NULL);
#else /* HAS_LDAP_SASL_BIND_S */
ret = ldap_simple_bind_s(*conn_ld, ldap_dn, ldap_dnpass);
#endif /* HAS_LDAP_SASL_BIND_S */
if (ret != LDAP_SUCCESS) {
pr_log_pri(PR_LOG_ERR, MOD_LDAP_VERSION ": pr_ldap_connect(): bind as %s failed: %s", ldap_dn ? ldap_dn : "(anonymous)", ldap_err2string(ret));
pr_ldap_unbind();
return -1;
}
pr_log_debug(DEBUG3, MOD_LDAP_VERSION ": successfully bound as %s with password %s", ldap_dn ? ldap_dn : "(anonymous)", ldap_dnpass ? "(see config)" : "(none)");
}
#ifdef LDAP_OPT_DEREF
ret = ldap_set_option(*conn_ld, LDAP_OPT_DEREF, (void *)&ldap_dereference);
if (ret != LDAP_OPT_SUCCESS) {
pr_log_pri(PR_LOG_ERR, MOD_LDAP_VERSION ": pr_ldap_connect(): ldap_set_option() unable to set dereference to %d: %s", ldap_dereference, ldap_err2string(ret));
pr_ldap_unbind();
return -1;
}
#else
deref_ld->ld_deref = ldap_dereference;
#endif
pr_log_debug(DEBUG3, MOD_LDAP_VERSION ": set dereferencing to %d", ldap_dereference);
ldap_querytimeout_tp.tv_sec = (ldap_querytimeout > 0 ? ldap_querytimeout : 5);
ldap_querytimeout_tp.tv_usec = 0;
pr_log_debug(DEBUG3, MOD_LDAP_VERSION ": set query timeout to %us", (unsigned)ldap_querytimeout_tp.tv_sec);
return 1;
}
static int pr_ldap_connect(LDAP **conn_ld, int do_bind) {
int start_server_index;
char *item;
LDAPURLDesc *url;
if (!ldap_servers || ldap_servers->nelts == 0) {
pr_log_pri(PR_LOG_ERR, MOD_LDAP_VERSION ": pr_ldap_connect(): internal error: no LDAP servers configured.");
return -1;
}
start_server_index = cur_server_index;
do {
item = ((char **)ldap_servers->elts)[cur_server_index];
/* item might be NULL if no LDAPServer directive was specified
* and we're using the SDK default.
*/
if (item) {
if (ldap_is_ldap_url(item)) {
if (ldap_url_parse(item, &url) != LDAP_URL_SUCCESS) {
pr_log_pri(PR_LOG_ERR, MOD_LDAP_VERSION ": pr_ldap_connect(): url %s was valid during ProFTPD startup, but is no longer valid?!", item);
++cur_server_index;
if (cur_server_index >= ldap_servers->nelts) {
cur_server_index = 0;
}
continue;
}
#ifdef HAS_LDAP_INITIALIZE
ldap_server_url = item;
#else /* HAS_LDAP_INITIALIZE */
/* Need to keep parsed host and port for pre-2000 ldap_init(). */
if (url->lud_host != NULL) {
ldap_server = pstrdup(session.pool, url->lud_host);
}
if (url->lud_port != 0) {
ldap_port = url->lud_port;
}
#endif /* HAS_LDAP_INITIALIZE */
if (url->lud_scope != LDAP_SCOPE_DEFAULT) {
ldap_search_scope = url->lud_scope;
if (ldap_search_scope == LDAP_SCOPE_BASE) {
pr_log_debug(DEBUG3, MOD_LDAP_VERSION ": WARNING: LDAP URL search scopes default to 'base' (not 'sub') and may not be what you want.");
}
}
ldap_free_urldesc(url);
} else {
#ifdef HAS_LDAP_INITIALIZE
ldap_server_url = pstrcat(session.pool, "ldap://", item, "/", NULL);
#else /* HAS_LDAP_INITIALIZE */
ldap_server = pstrdup(session.pool, item);
ldap_port = LDAP_PORT;
#endif /* HAS_LDAP_INITIALIZE */
}
}
if (_ldap_connect(conn_ld, do_bind) == 1) {
return 1;
}
++cur_server_index;
if (cur_server_index >= ldap_servers->nelts) {
cur_server_index = 0;
}
} while (cur_server_index != start_server_index);
return -1;
}
static char *
pr_ldap_interpolate_filter(pool *p, char *template, const char *value)
{
char *escaped_value, *filter;
escaped_value = sreplace(p, (char *)value,
"\\", "\\\\",
"*", "\\*",
"(", "\\(",
")", "\\)",
NULL
);
if (!escaped_value) {
return NULL;
}
filter = sreplace(p, template,
"%u", escaped_value,
"%v", escaped_value,
NULL
);
if (!filter) {
return NULL;
}
pr_log_debug(DEBUG3, MOD_LDAP_VERSION ": generated filter %s from template %s and value %s", filter, template, value);
return filter;
}
static LDAPMessage *
pr_ldap_search(char *basedn, char *filter, char *attrs[], int sizelimit,
int retry)
{
int ret;
LDAPMessage *result;
if (!basedn) {
pr_log_pri(PR_LOG_ERR, MOD_LDAP_VERSION ": no LDAP base DN specified for search filter %s, declining request.", filter ? filter : "(null)");
return NULL;
}
/* If the LDAP connection has gone away or hasn't been established
* yet, attempt to establish it now.
*/
if (ld == NULL) {
/* If we _still_ can't connect, give up and return NULL. */
if (pr_ldap_connect(&ld, TRUE) == -1) {
return NULL;
}
}
ret = LDAP_SEARCH(ld, basedn, ldap_search_scope, filter, attrs,
&ldap_querytimeout_tp, sizelimit, &result);
if (ret != LDAP_SUCCESS) {
if (ret != LDAP_SERVER_DOWN) {
pr_log_pri(PR_LOG_ERR, MOD_LDAP_VERSION ": pr_ldap_search(): LDAP search failed: %s", ldap_err2string(ret));
return NULL;
}
if (!retry) {
pr_log_pri(PR_LOG_ERR, MOD_LDAP_VERSION ": pr_ldap_search(): LDAP connection went away, search failed.");
pr_ldap_unbind();
return NULL;
}
pr_log_pri(PR_LOG_ERR, MOD_LDAP_VERSION ": pr_ldap_search(): LDAP connection went away, retrying search operation...");
pr_ldap_unbind();
return pr_ldap_search(basedn, filter, attrs, sizelimit, FALSE);
}
pr_log_debug(DEBUG3, MOD_LDAP_VERSION ": searched under base DN %s using filter %s", basedn, filter ? filter : "(null)");
return result;
}
static struct passwd *
pr_ldap_user_lookup(pool *p,
char *filter_template, const char *replace,
char *basedn, char *attrs[],
char **user_dn)
{
char *filter, *dn;
int i = 0;
struct passwd *pw;
LDAPMessage *result, *e;
LDAP_VALUE_T **values;
filter = pr_ldap_interpolate_filter(p, filter_template, replace);
if (!filter) {
return NULL;
}
result = pr_ldap_search(basedn, filter, attrs, 2, TRUE);
if (result == NULL) {
return NULL;
}
if (ldap_count_entries(ld, result) > 1) {
pr_log_pri(PR_LOG_ERR, MOD_LDAP_VERSION ": pr_ldap_user_lookup(): LDAP search returned multiple entries, aborting query");
ldap_msgfree(result);
return NULL;
}
e = ldap_first_entry(ld, result);
if (!e) {
ldap_msgfree(result);
pr_log_debug(DEBUG3, MOD_LDAP_VERSION ": no entries for filter %s under base DN %s", filter, basedn);
return NULL; /* No LDAP entries for this user */
}
pw = pcalloc(session.pool, sizeof(struct passwd));
while (attrs[i] != NULL) {
pr_log_debug(DEBUG3, MOD_LDAP_VERSION ": fetching value(s) for attr %s", attrs[i]);
values = LDAP_GET_VALUES(ld, e, attrs[i]);
if (values == NULL) {
pr_log_debug(DEBUG3, MOD_LDAP_VERSION ": no values for attribute %s, trying defaults...", attrs[i]);
/* Apply default values for attrs with no explicit values. */
/* If we can't find the [ug]idNumber attrs, just fill the passwd
* struct in with default values from the config file.
*/
if (strcasecmp(attrs[i], ldap_attr_uidnumber) == 0) {
if (ldap_defaultuid == -1) {
dn = ldap_get_dn(ld, e);
pr_log_pri(PR_LOG_ERR, MOD_LDAP_VERSION ": pr_ldap_user_lookup(): no %s attr for DN %s and LDAPDefaultUID was not specified!", ldap_attr_uidnumber, dn);
free(dn);
return NULL;
}
pw->pw_uid = ldap_defaultuid;
++i;
pr_log_debug(DEBUG3, MOD_LDAP_VERSION ": using default UID %lu", (unsigned long)pw->pw_uid);
continue;
}
if (strcasecmp(attrs[i], ldap_attr_gidnumber) == 0) {
if (ldap_defaultgid == -1) {
dn = ldap_get_dn(ld, e);
pr_log_pri(PR_LOG_ERR, MOD_LDAP_VERSION ": pr_ldap_user_lookup(): no %s attr for DN %s and LDAPDefaultGID was not specified!", ldap_attr_gidnumber, dn);
free(dn);
return NULL;
}
pw->pw_gid = ldap_defaultgid;
++i;
pr_log_debug(DEBUG3, MOD_LDAP_VERSION ": using default GID %lu", (unsigned long)pw->pw_gid);
continue;
}
if (strcasecmp(attrs[i], ldap_attr_homedirectory) == 0) {
if (!ldap_genhdir || !ldap_genhdir_prefix || !*ldap_genhdir_prefix) {
dn = ldap_get_dn(ld, e);
pr_log_pri(PR_LOG_ERR, MOD_LDAP_VERSION ": pr_ldap_user_lookup(): no %s attr for DN %s and LDAPGenerateHomedirPrefix was not enabled!", ldap_attr_homedirectory, dn);
free(dn);
return NULL;
}
if (ldap_genhdir_prefix_nouname) {
pw->pw_dir = pstrcat(session.pool, ldap_genhdir_prefix, NULL);
} else {
LDAP_VALUE_T **canon_username;
canon_username = LDAP_GET_VALUES(ld, e, ldap_attr_uid);
if (!canon_username) {
dn = ldap_get_dn(ld, e);
pr_log_pri(PR_LOG_ERR, MOD_LDAP_VERSION ": pr_ldap_user_lookup(): couldn't get %s attr for canonical username for %s", ldap_attr_uid, dn);
free(dn);
return NULL;
}
pw->pw_dir = pstrcat(session.pool, ldap_genhdir_prefix, "/", LDAP_VALUE(canon_username, 0), NULL);
LDAP_VALUE_FREE(canon_username);
}
++i;
pr_log_debug(DEBUG3, MOD_LDAP_VERSION ": using default homedir %s", pw->pw_dir);
continue;
}
/* Don't worry if we don't have a loginShell attr. */
if (strcasecmp(attrs[i], ldap_attr_loginshell) == 0) {
/* Prevent a segfault if no loginShell attr && RequireValidShell on. */
pw->pw_shell = pstrdup(session.pool, "");
++i;
continue;
}
/* We only restart the while loop above if we can fill in alternate
* values for certain attributes. If something odd has happened, we
* fall through so we can complain.
*/
dn = ldap_get_dn(ld, e);
pr_log_pri(PR_LOG_ERR, MOD_LDAP_VERSION ": pr_ldap_user_lookup(): couldn't get values for attr %s for DN %s, ignoring request (perhaps this DN's entry does not have the attr?)", attrs[i], dn);
free(dn);
ldap_msgfree(result);
return NULL;
}
/* Now that we've handled default values, fill in the struct as normal;
* the if branches below for nonexistent attrs will just never be
* called.
*/
if (strcasecmp(attrs[i], ldap_attr_uid) == 0) {
pw->pw_name = pstrdup(session.pool, LDAP_VALUE(values, 0));
} else if (strcasecmp(attrs[i], ldap_attr_userpassword) == 0) {
pw->pw_passwd = pstrdup(session.pool, LDAP_VALUE(values, 0));
} else if (strcasecmp(attrs[i], ldap_attr_uidnumber) == 0) {
if (ldap_forcedefaultuid && ldap_defaultuid != -1) {
pw->pw_uid = ldap_defaultuid;
} else {
pw->pw_uid = (uid_t) strtoul(LDAP_VALUE(values, 0), (char **)NULL, 10);
}
} else if (strcasecmp(attrs[i], ldap_attr_gidnumber) == 0) {
if (ldap_forcedefaultgid && ldap_defaultgid != -1) {
pw->pw_gid = ldap_defaultgid;
} else {
pw->pw_gid = (gid_t) strtoul(LDAP_VALUE(values, 0), (char **)NULL, 10);
}
} else if (strcasecmp(attrs[i], ldap_attr_homedirectory) == 0) {
if (ldap_forcegenhdir) {
if (!ldap_genhdir || !ldap_genhdir_prefix || !*ldap_genhdir_prefix) {
pr_log_pri(PR_LOG_ERR, MOD_LDAP_VERSION ": pr_ldap_user_lookup(): LDAPForceGeneratedHomedir is enabled, but LDAPGenerateHomedir is not.");
return NULL;
}
if (ldap_genhdir_prefix_nouname) {
pw->pw_dir = pstrcat(session.pool, ldap_genhdir_prefix, NULL);
} else {
LDAP_VALUE_T **canon_username;
canon_username = LDAP_GET_VALUES(ld, e, ldap_attr_uid);
if (!canon_username) {
dn = ldap_get_dn(ld, e);
pr_log_pri(PR_LOG_ERR, MOD_LDAP_VERSION ": pr_ldap_user_lookup(): couldn't get %s attr for canonical username for %s", ldap_attr_uid, dn);
free(dn);
return NULL;
}
pw->pw_dir = pstrcat(session.pool, ldap_genhdir_prefix, "/", LDAP_VALUE(canon_username, 0), NULL);
LDAP_VALUE_FREE(canon_username);
}
} else {
pw->pw_dir = pstrdup(session.pool, LDAP_VALUE(values, 0));
}
} else if (strcasecmp(attrs[i], ldap_attr_loginshell) == 0) {
pw->pw_shell = pstrdup(session.pool, LDAP_VALUE(values, 0));
} else {
pr_log_pri(PR_LOG_WARNING, MOD_LDAP_VERSION ": pr_ldap_user_lookup(): value loop found unknown attr %s", attrs[i]);
}
LDAP_VALUE_FREE(values);
++i;
}
/* If we're doing auth binds, save the DN of this entry so we can
* bind to the LDAP server as it later.
*/
if (user_dn) {
*user_dn = ldap_get_dn(ld, e);
}
ldap_msgfree(result);
pr_log_debug(DEBUG3, MOD_LDAP_VERSION ": "
"user %s, uid %lu, gid %lu, homedir %s, shell %s",
pw->pw_name, (unsigned long)pw->pw_uid, (unsigned long)pw->pw_gid,
pw->pw_dir, pw->pw_shell);
return pw;
}
static struct group *
pr_ldap_group_lookup(pool *p,
char *filter_template, const char *replace,
char *attrs[])
{
char *filter, *dn;
int i = 0, value_count = 0, value_offset;
struct group *gr;
LDAPMessage *result, *e;
LDAP_VALUE_T **values;
if (!ldap_gid_basedn) {
pr_log_pri(PR_LOG_ERR, MOD_LDAP_VERSION ": no LDAP base DN specified for group lookups.");
return NULL;
}
filter = pr_ldap_interpolate_filter(p, filter_template, replace);
if (!filter) {
return NULL;
}
result = pr_ldap_search(ldap_gid_basedn, filter, attrs, 2, TRUE);
if (result == NULL) {
return NULL;
}
e = ldap_first_entry(ld, result);
if (!e) {
ldap_msgfree(result);
pr_log_debug(DEBUG3, MOD_LDAP_VERSION ": no entries for filter %s", filter);
return NULL; /* No LDAP entries for this user */
}
gr = pcalloc(session.pool, sizeof(struct group));
while (attrs[i] != NULL) {
pr_log_debug(DEBUG3, MOD_LDAP_VERSION ": fetching value(s) for attr %s", attrs[i]);
values = LDAP_GET_VALUES(ld, e, attrs[i]);
if (!values) {
if (strcasecmp(attrs[i], ldap_attr_memberuid) == 0) {
gr->gr_mem = palloc(session.pool, 2 * sizeof(char *));
gr->gr_mem[0] = pstrdup(session.pool, "");
gr->gr_mem[1] = NULL;
++i;
continue;
}
ldap_msgfree(result);
dn = ldap_get_dn(ld, e);
pr_log_pri(PR_LOG_ERR, MOD_LDAP_VERSION ": pr_ldap_group_lookup(): couldn't get values for attr %s for DN %s, ignoring request (perhaps that DN does not have that attr?)", attrs[i], dn);
free(dn);
return NULL;
}
if (strcasecmp(attrs[i], ldap_attr_cn) == 0) {
gr->gr_name = pstrdup(session.pool, LDAP_VALUE(values, 0));
} else if (strcasecmp(attrs[i], ldap_attr_gidnumber) == 0) {
gr->gr_gid = strtoul(LDAP_VALUE(values, 0), (char **)NULL, 10);
} else if (strcasecmp(attrs[i], ldap_attr_memberuid) == 0) {
value_count = LDAP_COUNT_VALUES(values);
gr->gr_mem = (char **) palloc(session.pool, value_count * sizeof(char *));
for (value_offset = 0; value_offset < value_count; ++value_offset)
gr->gr_mem[value_offset] =
pstrdup(session.pool, LDAP_VALUE(values, value_offset));
} else {
pr_log_pri(PR_LOG_WARNING, MOD_LDAP_VERSION ": pr_ldap_group_lookup(): value loop found unknown attr %s", attrs[i]);
}
LDAP_VALUE_FREE(values);
++i;
}
ldap_msgfree(result);
pr_log_debug(DEBUG3, MOD_LDAP_VERSION ": "
"group %s, gid %lu", gr->gr_name, (unsigned long)gr->gr_gid);
for (i = 0; i < value_count; ++i) {
pr_log_debug(DEBUG3, MOD_LDAP_VERSION ": "
"group %s: member %s", gr->gr_name, gr->gr_mem[i]);
}
return gr;
}
static void
parse_quota(pool *p, const char *replace, char *str)
{
char **elts, *token;
if (cached_quota == NULL) {
cached_quota = make_array(p, 9, sizeof(char *));
}
elts = (char **)cached_quota->elts;
elts[0] = pstrdup(session.pool, replace);
cached_quota->nelts = 1;
pr_log_debug(DEBUG3, MOD_LDAP_VERSION ": parsing quota %s", str);
while ((token = strsep(&str, ","))) {
*((char **)push_array(cached_quota)) = pstrdup(session.pool, token);
}
}
static unsigned char
pr_ldap_quota_lookup(pool *p, char *filter_template, const char *replace,
char *basedn)
{
char *filter = NULL,
*attrs[] = {
ldap_attr_ftpquota, ldap_attr_ftpquota_profiledn, NULL,
};
int orig_scope, ret;
LDAPMessage *result, *e;
LDAP_VALUE_T **values;
if (!basedn) {
pr_log_pri(PR_LOG_ERR, MOD_LDAP_VERSION ": no LDAP base DN specified for quota lookups, declining request.");
return FALSE;
}
if (filter_template) {
filter = pr_ldap_interpolate_filter(p, filter_template, replace);
if (!filter) {
return FALSE;
}
}
result = pr_ldap_search(basedn, filter, attrs, 2, TRUE);
if (result == NULL) {
return FALSE;
}
if (ldap_count_entries(ld, result) > 1) {
pr_log_pri(PR_LOG_ERR, MOD_LDAP_VERSION ": pr_ldap_quota_lookup(): LDAP search returned multiple entries, aborting query");
ldap_msgfree(result);
if (ldap_default_quota != NULL) {
parse_quota(p, replace, pstrdup(p, ldap_default_quota));
return TRUE;
}
return FALSE;
}
e = ldap_first_entry(ld, result);
if (!e) {
ldap_msgfree(result);
if (ldap_default_quota == NULL) {
if (!filter) {
pr_log_debug(DEBUG3, MOD_LDAP_VERSION ": no entries for DN %s, and no default quota defined", basedn);
} else {
pr_log_debug(DEBUG3, MOD_LDAP_VERSION ": no entries for filter %s, and no default quota defined", filter);
}
return FALSE;
}
if (!filter) {
pr_log_debug(DEBUG3, MOD_LDAP_VERSION ": no entries for DN %s, using default quota %s", basedn, ldap_default_quota);
} else {
pr_log_debug(DEBUG3, MOD_LDAP_VERSION ": no entries for filter %s, using default quota %s", filter ? filter : "(null)", ldap_default_quota);
}
parse_quota(p, replace, pstrdup(p, ldap_default_quota));
return TRUE;
}
values = LDAP_GET_VALUES(ld, e, attrs[0]);
if (values) {
parse_quota(p, replace, pstrdup(p, LDAP_VALUE(values, 0)));
LDAP_VALUE_FREE(values);
ldap_msgfree(result);
return TRUE;
}
if (!filter) {
if (ldap_default_quota == NULL) {
pr_log_debug(DEBUG3, MOD_LDAP_VERSION ": referenced DN %s does not have an ftpQuota attribute, and no default quota defined", basedn);
return FALSE;
}
pr_log_debug(DEBUG3, MOD_LDAP_VERSION ": no ftpQuota attr for DN %s, using default quota %s", basedn, ldap_default_quota);
parse_quota(p, replace, pstrdup(p, ldap_default_quota));
return TRUE;
}
values = LDAP_GET_VALUES(ld, e, attrs[1]);
if (values) {
orig_scope = ldap_search_scope;
ldap_search_scope = LDAP_SCOPE_BASE;
ret = pr_ldap_quota_lookup(p, NULL, replace, LDAP_VALUE(values, 0));
ldap_search_scope = orig_scope;
LDAP_VALUE_FREE(values);
ldap_msgfree(result);
return ret;
}
ldap_msgfree(result);
if (ldap_default_quota != NULL) {
pr_log_debug(DEBUG3, MOD_LDAP_VERSION ": no %s or %s attribute, using default quota %s", attrs[0], attrs[1], ldap_default_quota);
parse_quota(p, replace, pstrdup(p, ldap_default_quota));
return TRUE;
}
pr_log_debug(DEBUG3, MOD_LDAP_VERSION ": no %s or %s attribute, and no default quota defined", attrs[0], attrs[1]);
return FALSE; /* No quota attrs for this user. */
}
static unsigned char
pr_ldap_ssh_pubkey_lookup(pool *p, char *filter_template, const char *replace,
char *basedn)
{
char *filter, *attrs[] = {
ldap_attr_ssh_pubkey, NULL,
};
int num_keys, i;
LDAPMessage *result, *e;
LDAP_VALUE_T **values;
if (!basedn) {
pr_log_pri(PR_LOG_ERR, MOD_LDAP_VERSION ": no LDAP base DN specified for user lookups, declining request.");
return FALSE;
}
filter = pr_ldap_interpolate_filter(p, filter_template, replace);
if (!filter) {
return FALSE;
}
result = pr_ldap_search(basedn, filter, attrs, 2, TRUE);
if (result == NULL) {
return FALSE;
}
if (ldap_count_entries(ld, result) > 1) {
pr_log_pri(PR_LOG_ERR, MOD_LDAP_VERSION ": pr_ldap_ssh_pubkey_lookup(): LDAP search returned multiple entries, aborting query.");
ldap_msgfree(result);
return FALSE;
}
e = ldap_first_entry(ld, result);
if (!e) {
pr_log_pri(PR_LOG_ERR, MOD_LDAP_VERSION ": pr_ldap_ssh_pubkey_lookup(): LDAP search returned no entries for filter %s", filter);
ldap_msgfree(result);
return FALSE;
}
values = LDAP_GET_VALUES(ld, e, attrs[0]);
if (!values) {
return FALSE;
}
num_keys = LDAP_COUNT_VALUES(values);
cached_ssh_pubkeys = make_array(p, num_keys, sizeof(char *));
for (i = 0; i < num_keys; ++i) {
*((char **) push_array(cached_ssh_pubkeys)) = pstrdup(p,
LDAP_VALUE(values, i));
}
LDAP_VALUE_FREE(values);
ldap_msgfree(result);
return TRUE;
}
static struct group *
pr_ldap_getgrnam(pool *p, const char *group_name)
{
char *group_attrs[] = {
ldap_attr_cn, ldap_attr_gidnumber, ldap_attr_memberuid, NULL,
};
return pr_ldap_group_lookup(p, ldap_group_name_filter,
group_name, group_attrs);
}
static struct group *
pr_ldap_getgrgid(pool *p, gid_t gid)
{
char gidstr[PR_TUNABLE_BUFFER_SIZE] = {'\0'},
*group_attrs[] = {
ldap_attr_cn, ldap_attr_gidnumber, ldap_attr_memberuid, NULL,
};
snprintf(gidstr, sizeof(gidstr), "%u", (unsigned)gid);
return pr_ldap_group_lookup(p, ldap_group_gid_filter,
(const char *)gidstr, group_attrs);
}
static struct passwd *
pr_ldap_getpwnam(pool *p, const char *username)
{
char *filter,
*name_attrs[] = {
ldap_attr_userpassword, ldap_attr_uid, ldap_attr_uidnumber,
ldap_attr_gidnumber, ldap_attr_homedirectory,
ldap_attr_loginshell, NULL,
};
filter = pr_ldap_interpolate_filter(p, ldap_user_basedn, username);
if (!filter) {
return NULL;
}
/* pr_ldap_user_lookup() returns NULL if it doesn't find an entry or
* encounters an error. If everything goes all right, it returns a
* struct passwd, so we can just return its result directly.
*
* We also do some cute stuff here to work around lameness in LDAP servers
* like Sun Directory Services (SDS) 1.x and 3.x. If you request an attr
* that you don't have access to, SDS totally ignores any entries with
* that attribute. Thank you, Sun; how very smart of you. So if we're
* doing auth binds, we don't request the userPassword attr.
*
* NOTE: if the UserPassword directive is configured, mod_auth will pass
* a crypted password to handle_ldap_check(), which will NOT do auth binds
* in order to support UserPassword. (Otherwise, it would try binding to
* the directory and would ignore UserPassword.)
*
* We're reasonably safe in making that assumption as long as we never
* fetch userPassword from the directory if auth binds are enabled. If we
* fetched userPassword, auth binds would never be done because
* handle_ldap_check() would always get a crypted password.
*/
return pr_ldap_user_lookup(p, ldap_user_name_filter, username, filter,
ldap_authbinds ? name_attrs + 1 : name_attrs,
ldap_authbinds ? &ldap_authbind_dn : NULL);
}
static struct passwd *
pr_ldap_getpwuid(pool *p, uid_t uid)
{
char uidstr[PR_TUNABLE_BUFFER_SIZE] = {'\0'},
*uid_attrs[] = {
ldap_attr_uid, ldap_attr_uidnumber, ldap_attr_gidnumber,
ldap_attr_homedirectory, ldap_attr_loginshell, NULL,
};
snprintf(uidstr, sizeof(uidstr), "%u", (unsigned)uid);
return pr_ldap_user_lookup(p, ldap_user_uid_filter, (const char *)uidstr,
ldap_user_basedn, uid_attrs, ldap_authbinds ? &ldap_authbind_dn : NULL);
}
MODRET
handle_ldap_quota_lookup(cmd_rec *cmd)
{
char *basedn;
basedn = pr_ldap_interpolate_filter(cmd->tmp_pool,
ldap_user_basedn, cmd->argv[0]);
if (!basedn) {
return PR_DECLINED(cmd);
}
if (cached_quota == NULL ||
strcasecmp(((char **)cached_quota->elts)[0], cmd->argv[0]) != 0)
{