/*
* Copyright (c) 2003-2013 Todd C. Miller <Todd.Miller@courtesan.com>
*
* This code is derived from software contributed by Aaron Spangler.
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <config.h>
#include <sys/types.h>
#include <sys/time.h>
#include <sys/stat.h>
#include <stdio.h>
#ifdef STDC_HEADERS
# include <stdlib.h>
# include <stddef.h>
#else
# ifdef HAVE_STDLIB_H
# include <stdlib.h>
# endif
#endif /* STDC_HEADERS */
#ifdef HAVE_STRING_H
# include <string.h>
#endif /* HAVE_STRING_H */
#ifdef HAVE_STRINGS_H
# include <strings.h>
#endif /* HAVE_STRINGS_H */
#ifdef HAVE_UNISTD_H
# include <unistd.h>
#endif /* HAVE_UNISTD_H */
#if TIME_WITH_SYS_TIME
# include <time.h>
#endif
#include <ctype.h>
#include <pwd.h>
#include <grp.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#ifdef HAVE_LBER_H
# include <lber.h>
#endif
#include <ldap.h>
#if defined(HAVE_LDAP_SSL_H)
# include <ldap_ssl.h>
#elif defined(HAVE_MPS_LDAP_SSL_H)
# include <mps/ldap_ssl.h>
#endif
#ifdef HAVE_LDAP_SASL_INTERACTIVE_BIND_S
# ifdef HAVE_SASL_SASL_H
# include <sasl/sasl.h>
# else
# include <sasl.h>
# endif
# if HAVE_GSS_KRB5_CCACHE_NAME
# if defined(HAVE_GSSAPI_GSSAPI_KRB5_H)
# include <gssapi/gssapi.h>
# include <gssapi/gssapi_krb5.h>
# elif defined(HAVE_GSSAPI_GSSAPI_H)
# include <gssapi/gssapi.h>
# else
# include <gssapi.h>
# endif
# endif
#endif
#include "sudoers.h"
#include "parse.h"
#include "lbuf.h"
/* Older Netscape LDAP SDKs don't prototype ldapssl_set_strength() */
#if defined(HAVE_LDAPSSL_SET_STRENGTH) && !defined(HAVE_LDAP_SSL_H) && !defined(HAVE_MPS_LDAP_SSL_H)
extern int ldapssl_set_strength(LDAP *ldap, int strength);
#endif
#if !defined(LDAP_OPT_NETWORK_TIMEOUT) && defined(LDAP_OPT_CONNECT_TIMEOUT)
# define LDAP_OPT_NETWORK_TIMEOUT LDAP_OPT_CONNECT_TIMEOUT
#endif
#ifndef LDAP_OPT_SUCCESS
# define LDAP_OPT_SUCCESS LDAP_SUCCESS
#endif
#ifndef LDAPS_PORT
# define LDAPS_PORT 636
#endif
#if defined(HAVE_LDAP_SASL_INTERACTIVE_BIND_S) && !defined(LDAP_SASL_QUIET)
# define LDAP_SASL_QUIET 0
#endif
#ifndef HAVE_LDAP_UNBIND_EXT_S
#define ldap_unbind_ext_s(a, b, c) ldap_unbind_s(a)
#endif
#ifndef HAVE_LDAP_SEARCH_EXT_S
# ifdef HAVE_LDAP_SEARCH_ST
# define ldap_search_ext_s(a, b, c, d, e, f, g, h, i, j, k) \
ldap_search_st(a, b, c, d, e, f, i, k)
# else
# define ldap_search_ext_s(a, b, c, d, e, f, g, h, i, j, k) \
ldap_search_s(a, b, c, d, e, f, k)
# endif
#endif
#define LDAP_FOREACH(var, ld, res) \
for ((var) = ldap_first_entry((ld), (res)); \
(var) != NULL; \
(var) = ldap_next_entry((ld), (var)))
#if defined(__GNUC__) && __GNUC__ == 2
# define DPRINTF1(fmt...) do { \
if (ldap_conf.debug >= 1) \
warningx(__VA_ARGS__); \
sudo_debug_printf(SUDO_DEBUG_DIAG, fmt); \
} while (0)
# define DPRINTF2(fmt...) do { \
if (ldap_conf.debug >= 2) \
warningx(__VA_ARGS__); \
sudo_debug_printf(SUDO_DEBUG_INFO, fmt); \
} while (0)
#else
# define DPRINTF1(...) do { \
if (ldap_conf.debug >= 1) \
warningx(__VA_ARGS__); \
sudo_debug_printf(SUDO_DEBUG_DIAG, __VA_ARGS__); \
} while (0)
# define DPRINTF2(...) do { \
if (ldap_conf.debug >= 2) \
warningx(__VA_ARGS__); \
sudo_debug_printf(SUDO_DEBUG_INFO, __VA_ARGS__); \
} while (0)
#endif
#define CONF_BOOL 0
#define CONF_INT 1
#define CONF_STR 2
#define CONF_LIST_STR 4
#define CONF_DEREF_VAL 5
#define SUDO_LDAP_CLEAR 0
#define SUDO_LDAP_SSL 1
#define SUDO_LDAP_STARTTLS 2
/* The TIMEFILTER_LENGTH is the length of the filter when timed entries
are used. The length is computed as follows:
81 for the filter itself
+ 2 * 17 for the now timestamp
*/
#define TIMEFILTER_LENGTH 115
/*
* The ldap_search structure implements a linked list of ldap and
* search result pointers, which allows us to remove them after
* all search results have been combined in memory.
* XXX - should probably be a tailq since we do appends
*/
struct ldap_search_list {
LDAP *ldap;
LDAPMessage *searchresult;
struct ldap_search_list *next;
};
/*
* The ldap_entry_wrapper structure is used to implement sorted result entries.
* A double is used for the order to allow for insertion of new entries
* without having to renumber everything.
* Note: there is no standard floating point type in LDAP.
* As a result, some LDAP servers will only allow an integer.
*/
struct ldap_entry_wrapper {
LDAPMessage *entry;
double order;
};
/*
* The ldap_result structure contains the list of matching searches as
* well as an array of all result entries sorted by the sudoOrder attribute.
*/
struct ldap_result {
struct ldap_search_list *searches;
struct ldap_entry_wrapper *entries;
int allocated_entries;
int nentries;
int user_matches;
int host_matches;
};
#define ALLOCATION_INCREMENT 100
struct ldap_config_table {
const char *conf_str; /* config file string */
int type; /* CONF_BOOL, CONF_INT, CONF_STR */
int opt_val; /* LDAP_OPT_* (or -1 for sudo internal) */
void *valp; /* pointer into ldap_conf */
};
struct ldap_config_list_str {
struct ldap_config_list_str *next;
char val[1];
};
/* LDAP configuration structure */
static struct ldap_config {
int port;
int version;
int debug;
int ldap_debug;
int tls_checkpeer;
int timelimit;
int timeout;
int bind_timelimit;
int use_sasl;
int rootuse_sasl;
int ssl_mode;
int timed;
int deref;
char *host;
struct ldap_config_list_str *uri;
char *binddn;
char *bindpw;
char *rootbinddn;
struct ldap_config_list_str *base;
char *search_filter;
char *ssl;
char *tls_cacertfile;
char *tls_cacertdir;
char *tls_random_file;
char *tls_cipher_suite;
char *tls_certfile;
char *tls_keyfile;
char *tls_keypw;
char *sasl_auth_id;
char *rootsasl_auth_id;
char *sasl_secprops;
char *krb5_ccname;
} ldap_conf;
static struct ldap_config_table ldap_conf_global[] = {
{ "sudoers_debug", CONF_INT, -1, &ldap_conf.debug },
{ "host", CONF_STR, -1, &ldap_conf.host },
{ "port", CONF_INT, -1, &ldap_conf.port },
{ "ssl", CONF_STR, -1, &ldap_conf.ssl },
{ "sslpath", CONF_STR, -1, &ldap_conf.tls_certfile },
{ "uri", CONF_LIST_STR, -1, &ldap_conf.uri },
#ifdef LDAP_OPT_DEBUG_LEVEL
{ "debug", CONF_INT, LDAP_OPT_DEBUG_LEVEL, &ldap_conf.ldap_debug },
#endif
#ifdef LDAP_OPT_X_TLS_REQUIRE_CERT
{ "tls_checkpeer", CONF_BOOL, LDAP_OPT_X_TLS_REQUIRE_CERT,
&ldap_conf.tls_checkpeer },
#else
{ "tls_checkpeer", CONF_BOOL, -1, &ldap_conf.tls_checkpeer },
#endif
#ifdef LDAP_OPT_X_TLS_CACERTFILE
{ "tls_cacertfile", CONF_STR, LDAP_OPT_X_TLS_CACERTFILE,
&ldap_conf.tls_cacertfile },
{ "tls_cacert", CONF_STR, LDAP_OPT_X_TLS_CACERTFILE,
&ldap_conf.tls_cacertfile },
#endif
#ifdef LDAP_OPT_X_TLS_CACERTDIR
{ "tls_cacertdir", CONF_STR, LDAP_OPT_X_TLS_CACERTDIR,
&ldap_conf.tls_cacertdir },
#endif
#ifdef LDAP_OPT_X_TLS_RANDOM_FILE
{ "tls_randfile", CONF_STR, LDAP_OPT_X_TLS_RANDOM_FILE,
&ldap_conf.tls_random_file },
#endif
#ifdef LDAP_OPT_X_TLS_CIPHER_SUITE
{ "tls_ciphers", CONF_STR, LDAP_OPT_X_TLS_CIPHER_SUITE,
&ldap_conf.tls_cipher_suite },
#elif defined(LDAP_OPT_SSL_CIPHER)
{ "tls_ciphers", CONF_STR, LDAP_OPT_SSL_CIPHER,
&ldap_conf.tls_cipher_suite },
#endif
#ifdef LDAP_OPT_X_TLS_CERTFILE
{ "tls_cert", CONF_STR, LDAP_OPT_X_TLS_CERTFILE,
&ldap_conf.tls_certfile },
#else
{ "tls_cert", CONF_STR, -1, &ldap_conf.tls_certfile },
#endif
#ifdef LDAP_OPT_X_TLS_KEYFILE
{ "tls_key", CONF_STR, LDAP_OPT_X_TLS_KEYFILE,
&ldap_conf.tls_keyfile },
#else
{ "tls_key", CONF_STR, -1, &ldap_conf.tls_keyfile },
#endif
#ifdef HAVE_LDAP_SSL_CLIENT_INIT
{ "tls_keypw", CONF_STR, -1, &ldap_conf.tls_keypw },
#endif
{ "binddn", CONF_STR, -1, &ldap_conf.binddn },
{ "bindpw", CONF_STR, -1, &ldap_conf.bindpw },
{ "rootbinddn", CONF_STR, -1, &ldap_conf.rootbinddn },
{ "sudoers_base", CONF_LIST_STR, -1, &ldap_conf.base },
{ "sudoers_timed", CONF_BOOL, -1, &ldap_conf.timed },
{ "sudoers_search_filter", CONF_STR, -1, &ldap_conf.search_filter },
#ifdef HAVE_LDAP_SASL_INTERACTIVE_BIND_S
{ "use_sasl", CONF_BOOL, -1, &ldap_conf.use_sasl },
{ "sasl_auth_id", CONF_STR, -1, &ldap_conf.sasl_auth_id },
{ "rootuse_sasl", CONF_BOOL, -1, &ldap_conf.rootuse_sasl },
{ "rootsasl_auth_id", CONF_STR, -1, &ldap_conf.rootsasl_auth_id },
{ "krb5_ccname", CONF_STR, -1, &ldap_conf.krb5_ccname },
#endif /* HAVE_LDAP_SASL_INTERACTIVE_BIND_S */
{ NULL }
};
static struct ldap_config_table ldap_conf_conn[] = {
#ifdef LDAP_OPT_PROTOCOL_VERSION
{ "ldap_version", CONF_INT, LDAP_OPT_PROTOCOL_VERSION,
&ldap_conf.version },
#endif
#ifdef LDAP_OPT_NETWORK_TIMEOUT
{ "bind_timelimit", CONF_INT, -1 /* needs timeval, set manually */,
&ldap_conf.bind_timelimit },
{ "network_timeout", CONF_INT, -1 /* needs timeval, set manually */,
&ldap_conf.bind_timelimit },
#elif defined(LDAP_X_OPT_CONNECT_TIMEOUT)
{ "bind_timelimit", CONF_INT, LDAP_X_OPT_CONNECT_TIMEOUT,
&ldap_conf.bind_timelimit },
{ "network_timeout", CONF_INT, LDAP_X_OPT_CONNECT_TIMEOUT,
&ldap_conf.bind_timelimit },
#endif
{ "timelimit", CONF_INT, LDAP_OPT_TIMELIMIT, &ldap_conf.timelimit },
#ifdef LDAP_OPT_TIMEOUT
{ "timeout", CONF_INT, -1 /* needs timeval, set manually */,
&ldap_conf.timeout },
#endif
#ifdef LDAP_OPT_DEREF
{ "deref", CONF_DEREF_VAL, LDAP_OPT_DEREF, &ldap_conf.deref },
#endif
#ifdef LDAP_OPT_X_SASL_SECPROPS
{ "sasl_secprops", CONF_STR, LDAP_OPT_X_SASL_SECPROPS,
&ldap_conf.sasl_secprops },
#endif
{ NULL }
};
/* sudo_nss implementation */
static int sudo_ldap_open(struct sudo_nss *nss);
static int sudo_ldap_close(struct sudo_nss *nss);
static int sudo_ldap_parse(struct sudo_nss *nss);
static int sudo_ldap_setdefs(struct sudo_nss *nss);
static int sudo_ldap_lookup(struct sudo_nss *nss, int ret, int pwflag);
static int sudo_ldap_display_cmnd(struct sudo_nss *nss, struct passwd *pw);
static int sudo_ldap_display_defaults(struct sudo_nss *nss, struct passwd *pw,
struct lbuf *lbuf);
static int sudo_ldap_display_bound_defaults(struct sudo_nss *nss,
struct passwd *pw, struct lbuf *lbuf);
static int sudo_ldap_display_privs(struct sudo_nss *nss, struct passwd *pw,
struct lbuf *lbuf);
static struct ldap_result *sudo_ldap_result_get(struct sudo_nss *nss,
struct passwd *pw);
/*
* LDAP sudo_nss handle.
* We store the connection to the LDAP server, the cached ldap_result object
* (if any), and the name of the user the query was performed for.
* If a new query is launched with sudo_ldap_result_get() that specifies a
* different user, the old cached result is freed before the new query is run.
*/
struct sudo_ldap_handle {
LDAP *ld;
struct ldap_result *result;
char *username;
struct group_list *grlist;
};
struct sudo_nss sudo_nss_ldap = {
&sudo_nss_ldap,
NULL,
sudo_ldap_open,
sudo_ldap_close,
sudo_ldap_parse,
sudo_ldap_setdefs,
sudo_ldap_lookup,
sudo_ldap_display_cmnd,
sudo_ldap_display_defaults,
sudo_ldap_display_bound_defaults,
sudo_ldap_display_privs
};
#ifdef HAVE_LDAP_CREATE
/*
* Rebuild the hosts list and include a specific port for each host.
* ldap_create() does not take a default port parameter so we must
* append one if we want something other than LDAP_PORT.
*/
static void
sudo_ldap_conf_add_ports(void)
{
char *host, *port, defport[13];
char hostbuf[LINE_MAX * 2];
debug_decl(sudo_ldap_conf_add_ports, SUDO_DEBUG_LDAP)
hostbuf[0] = '\0';
if (snprintf(defport, sizeof(defport), ":%d", ldap_conf.port) >= sizeof(defport))
fatalx(_("sudo_ldap_conf_add_ports: port too large"));
for ((host = strtok(ldap_conf.host, " \t")); host; (host = strtok(NULL, " \t"))) {
if (hostbuf[0] != '\0') {
if (strlcat(hostbuf, " ", sizeof(hostbuf)) >= sizeof(hostbuf))
goto toobig;
}
if (strlcat(hostbuf, host, sizeof(hostbuf)) >= sizeof(hostbuf))
goto toobig;
/* Append port if there is not one already. */
if ((port = strrchr(host, ':')) == NULL ||
!isdigit((unsigned char)port[1])) {
if (strlcat(hostbuf, defport, sizeof(hostbuf)) >= sizeof(hostbuf))
goto toobig;
}
}
efree(ldap_conf.host);
ldap_conf.host = estrdup(hostbuf);
debug_return;
toobig:
fatalx(_("sudo_ldap_conf_add_ports: out of space expanding hostbuf"));
}
#endif
#ifndef HAVE_LDAP_INITIALIZE
/*
* For each uri, convert to host:port pairs. For ldaps:// enable SSL
* Accepts: uris of the form ldap:/// or ldap://hostname:portnum/
* where the trailing slash is optional.
*/
static int
sudo_ldap_parse_uri(const struct ldap_config_list_str *uri_list)
{
char *buf, *uri, *host, *cp, *port;
char hostbuf[LINE_MAX];
int nldap = 0, nldaps = 0;
int rc = -1;
debug_decl(sudo_ldap_parse_uri, SUDO_DEBUG_LDAP)
do {
buf = estrdup(uri_list->val);
hostbuf[0] = '\0';
for ((uri = strtok(buf, " \t")); uri != NULL; (uri = strtok(NULL, " \t"))) {
if (strncasecmp(uri, "ldap://", 7) == 0) {
nldap++;
host = uri + 7;
} else if (strncasecmp(uri, "ldaps://", 8) == 0) {
nldaps++;
host = uri + 8;
} else {
warningx(_("unsupported LDAP uri type: %s"), uri);
goto done;
}
/* trim optional trailing slash */
if ((cp = strrchr(host, '/')) != NULL && cp[1] == '\0') {
*cp = '\0';
}
if (hostbuf[0] != '\0') {
if (strlcat(hostbuf, " ", sizeof(hostbuf)) >= sizeof(hostbuf))
goto toobig;
}
if (*host == '\0')
host = "localhost"; /* no host specified, use localhost */
if (strlcat(hostbuf, host, sizeof(hostbuf)) >= sizeof(hostbuf))
goto toobig;
/* If using SSL and no port specified, add port 636 */
if (nldaps) {
if ((port = strrchr(host, ':')) == NULL ||
!isdigit((unsigned char)port[1]))
if (strlcat(hostbuf, ":636", sizeof(hostbuf)) >= sizeof(hostbuf))
goto toobig;
}
}
if (hostbuf[0] == '\0') {
warningx(_("invalid uri: %s"), uri_list->val);
goto done;
}
if (nldaps != 0) {
if (nldap != 0) {
warningx(_("unable to mix ldap and ldaps URIs"));
goto done;
}
if (ldap_conf.ssl_mode == SUDO_LDAP_STARTTLS) {
warningx(_("unable to mix ldaps and starttls"));
goto done;
}
ldap_conf.ssl_mode = SUDO_LDAP_SSL;
}
efree(ldap_conf.host);
ldap_conf.host = estrdup(hostbuf);
efree(buf);
} while ((uri_list = uri_list->next));
buf = NULL;
rc = 0;
done:
efree(buf);
debug_return_int(rc);
toobig:
fatalx(_("sudo_ldap_parse_uri: out of space building hostbuf"));
}
#else
static char *
sudo_ldap_join_uri(struct ldap_config_list_str *uri_list)
{
struct ldap_config_list_str *uri;
size_t len = 0;
char *buf, *cp;
debug_decl(sudo_ldap_join_uri, SUDO_DEBUG_LDAP)
/* Usually just a single entry. */
if (uri_list->next == NULL)
debug_return_str(estrdup(uri_list->val));
for (uri = uri_list; uri != NULL; uri = uri->next) {
len += strlen(uri->val) + 1;
}
buf = cp = emalloc(len);
buf[0] = '\0';
for (uri = uri_list; uri != NULL; uri = uri->next) {
cp += strlcpy(cp, uri->val, len - (cp - buf));
*cp++ = ' ';
}
cp[-1] = '\0';
debug_return_str(buf);
}
#endif /* HAVE_LDAP_INITIALIZE */
static int
sudo_ldap_init(LDAP **ldp, const char *host, int port)
{
LDAP *ld = NULL;
int rc = LDAP_CONNECT_ERROR;
debug_decl(sudo_ldap_init, SUDO_DEBUG_LDAP)
#ifdef HAVE_LDAPSSL_INIT
if (ldap_conf.ssl_mode != SUDO_LDAP_CLEAR) {
const int defsecure = ldap_conf.ssl_mode == SUDO_LDAP_SSL;
DPRINTF2("ldapssl_clientauth_init(%s, %s)",
ldap_conf.tls_certfile ? ldap_conf.tls_certfile : "NULL",
ldap_conf.tls_keyfile ? ldap_conf.tls_keyfile : "NULL");
rc = ldapssl_clientauth_init(ldap_conf.tls_certfile, NULL,
ldap_conf.tls_keyfile != NULL, ldap_conf.tls_keyfile, NULL);
/*
* Starting with version 5.0, Mozilla-derived LDAP SDKs require
* the cert and key paths to be a directory, not a file.
* If the user specified a file and it fails, try the parent dir.
*/
if (rc != LDAP_SUCCESS) {
bool retry = false;
if (ldap_conf.tls_certfile != NULL) {
char *cp = strrchr(ldap_conf.tls_certfile, '/');
if (cp != NULL && strncmp(cp + 1, "cert", 4) == 0) {
*cp = '\0';
retry = true;
}
}
if (ldap_conf.tls_keyfile != NULL) {
char *cp = strrchr(ldap_conf.tls_keyfile, '/');
if (cp != NULL && strncmp(cp + 1, "key", 3) == 0) {
*cp = '\0';
retry = true;
}
}
if (retry) {
DPRINTF2("ldapssl_clientauth_init(%s, %s)",
ldap_conf.tls_certfile ? ldap_conf.tls_certfile : "NULL",
ldap_conf.tls_keyfile ? ldap_conf.tls_keyfile : "NULL");
rc = ldapssl_clientauth_init(ldap_conf.tls_certfile, NULL,
ldap_conf.tls_keyfile != NULL, ldap_conf.tls_keyfile, NULL);
}
}
if (rc != LDAP_SUCCESS) {
warningx(_("unable to initialize SSL cert and key db: %s"),
ldapssl_err2string(rc));
if (ldap_conf.tls_certfile == NULL)
warningx(_("you must set TLS_CERT in %s to use SSL"),
path_ldap_conf);
goto done;
}
DPRINTF2("ldapssl_init(%s, %d, %d)", host, port, defsecure);
if ((ld = ldapssl_init(host, port, defsecure)) != NULL)
rc = LDAP_SUCCESS;
} else
#elif defined(HAVE_LDAP_SSL_INIT) && defined(HAVE_LDAP_SSL_CLIENT_INIT)
if (ldap_conf.ssl_mode == SUDO_LDAP_SSL) {
if (ldap_ssl_client_init(ldap_conf.tls_keyfile, ldap_conf.tls_keypw, 0, &rc) != LDAP_SUCCESS) {
warningx("ldap_ssl_client_init(): %s", ldap_err2string(rc));
debug_return_int(-1);
}
DPRINTF2("ldap_ssl_init(%s, %d, NULL)", host, port);
if ((ld = ldap_ssl_init((char *)host, port, NULL)) != NULL)
rc = LDAP_SUCCESS;
} else
#endif
{
#ifdef HAVE_LDAP_CREATE
DPRINTF2("ldap_create()");
if ((rc = ldap_create(&ld)) != LDAP_SUCCESS)
goto done;
DPRINTF2("ldap_set_option(LDAP_OPT_HOST_NAME, %s)", host);
rc = ldap_set_option(ld, LDAP_OPT_HOST_NAME, host);
#else
DPRINTF2("ldap_init(%s, %d)", host, port);
if ((ld = ldap_init((char *)host, port)) != NULL)
rc = LDAP_SUCCESS;
#endif
}
done:
*ldp = ld;
debug_return_int(rc);
}
/*
* Walk through search results and return true if we have a matching
* non-Unix group (including netgroups), else false.
*/
static bool
sudo_ldap_check_non_unix_group(LDAP *ld, LDAPMessage *entry, struct passwd *pw)
{
struct berval **bv, **p;
char *val;
int ret = false;
debug_decl(sudo_ldap_check_non_unix_group, SUDO_DEBUG_LDAP)
if (!entry)
debug_return_bool(ret);
/* get the values from the entry */
bv = ldap_get_values_len(ld, entry, "sudoUser");
if (bv == NULL)
debug_return_bool(ret);
/* walk through values */
for (p = bv; *p != NULL && !ret; p++) {
val = (*p)->bv_val;
if (*val == '+') {
if (netgr_matches(val, NULL, NULL, pw->pw_name))
ret = true;
DPRINTF2("ldap sudoUser netgroup '%s' ... %s", val,
ret ? "MATCH!" : "not");
} else {
if (group_plugin_query(pw->pw_name, val + 2, pw))
ret = true;
DPRINTF2("ldap sudoUser non-Unix group '%s' ... %s", val,
ret ? "MATCH!" : "not");
}
}
ldap_value_free_len(bv); /* cleanup */
debug_return_bool(ret);
}
/*
* Walk through search results and return true if we have a
* host match, else false.
*/
static bool
sudo_ldap_check_host(LDAP *ld, LDAPMessage *entry)
{
struct berval **bv, **p;
char *val;
bool ret = false;
debug_decl(sudo_ldap_check_host, SUDO_DEBUG_LDAP)
if (!entry)
debug_return_bool(ret);
/* get the values from the entry */
bv = ldap_get_values_len(ld, entry, "sudoHost");
if (bv == NULL)
debug_return_bool(ret);
/* walk through values */
for (p = bv; *p != NULL && !ret; p++) {
val = (*p)->bv_val;
/* match any or address or netgroup or hostname */
if (!strcmp(val, "ALL") || addr_matches(val) ||
netgr_matches(val, user_host, user_shost, NULL) ||
hostname_matches(user_shost, user_host, val))
ret = true;
DPRINTF2("ldap sudoHost '%s' ... %s", val, ret ? "MATCH!" : "not");
}
ldap_value_free_len(bv); /* cleanup */
debug_return_bool(ret);
}
static int
sudo_ldap_check_runas_user(LDAP *ld, LDAPMessage *entry)
{
struct berval **bv, **p;
char *val;
bool ret = false;
debug_decl(sudo_ldap_check_runas_user, SUDO_DEBUG_LDAP)
if (!runas_pw)
debug_return_bool(UNSPEC);
/* get the runas user from the entry */
bv = ldap_get_values_len(ld, entry, "sudoRunAsUser");
if (bv == NULL)
bv = ldap_get_values_len(ld, entry, "sudoRunAs"); /* old style */
/*
* BUG:
*
* if runas is not specified on the command line, the only information
* as to which user to run as is in the runas_default option. We should
* check to see if we have the local option present. Unfortunately we
* don't parse these options until after this routine says yes or no.
* The query has already returned, so we could peek at the attribute
* values here though.
*
* For now just require users to always use -u option unless its set
* in the global defaults. This behaviour is no different than the global
* /etc/sudoers.
*
* Sigh - maybe add this feature later
*/
/*
* If there are no runas entries, match runas_default against
* what the user specified on the command line.
*/
if (bv == NULL)
debug_return_bool(!strcasecmp(runas_pw->pw_name, def_runas_default));
/* walk through values returned, looking for a match */
for (p = bv; *p != NULL && !ret; p++) {
val = (*p)->bv_val;
switch (val[0]) {
case '+':
if (netgr_matches(val, NULL, NULL, runas_pw->pw_name))
ret = true;
break;
case '%':
if (usergr_matches(val, runas_pw->pw_name, runas_pw))
ret = true;
break;
case 'A':
if (strcmp(val, "ALL") == 0) {
ret = true;
break;
}
/* FALLTHROUGH */
default:
if (userpw_matches(val, runas_pw->pw_name, runas_pw))
ret = true;
break;
}
DPRINTF2("ldap sudoRunAsUser '%s' ... %s", val, ret ? "MATCH!" : "not");
}
ldap_value_free_len(bv); /* cleanup */
debug_return_bool(ret);
}
static int
sudo_ldap_check_runas_group(LDAP *ld, LDAPMessage *entry)
{
struct berval **bv, **p;
char *val;
bool ret = false;
debug_decl(sudo_ldap_check_runas_group, SUDO_DEBUG_LDAP)
/* runas_gr is only set if the user specified the -g flag */
if (!runas_gr)
debug_return_bool(UNSPEC);
/* get the values from the entry */
bv = ldap_get_values_len(ld, entry, "sudoRunAsGroup");
if (bv == NULL)
debug_return_bool(ret);
/* walk through values returned, looking for a match */
for (p = bv; *p != NULL && !ret; p++) {
val = (*p)->bv_val;
if (strcmp(val, "ALL") == 0 || group_matches(val, runas_gr))
ret = true;
DPRINTF2("ldap sudoRunAsGroup '%s' ... %s",
val, ret ? "MATCH!" : "not");
}
ldap_value_free_len(bv); /* cleanup */
debug_return_bool(ret);
}
/*
* Walk through search results and return true if we have a runas match,
* else false. RunAs info is optional.
*/
static bool
sudo_ldap_check_runas(LDAP *ld, LDAPMessage *entry)
{
bool ret;
debug_decl(sudo_ldap_check_runas, SUDO_DEBUG_LDAP)
if (!entry)
debug_return_bool(false);
ret = sudo_ldap_check_runas_user(ld, entry) != false &&
sudo_ldap_check_runas_group(ld, entry) != false;
debug_return_bool(ret);
}
static struct sudo_digest *
sudo_ldap_extract_digest(char **cmnd, struct sudo_digest *digest)
{
char *ep, *cp = *cmnd;
int digest_type = SUDO_DIGEST_INVALID;
debug_decl(sudo_ldap_check_command, SUDO_DEBUG_LDAP)
/*
* Check for and extract a digest prefix, e.g.
* sha224:d06a2617c98d377c250edd470fd5e576327748d82915d6e33b5f8db1 /bin/ls
*/
if (cp[0] == 's' && cp[1] == 'h' && cp[2] == 'a') {
switch (cp[3]) {
case '2':
if (cp[4] == '2' && cp[5] == '4')
digest_type = SUDO_DIGEST_SHA224;
else if (cp[4] == '5' && cp[5] == '6')
digest_type = SUDO_DIGEST_SHA256;
break;
case '3':
if (cp[4] == '8' && cp[5] == '4')
digest_type = SUDO_DIGEST_SHA384;
break;
case '5':
if (cp[4] == '1' && cp[5] == '2')
digest_type = SUDO_DIGEST_SHA512;
break;
}
if (digest_type != SUDO_DIGEST_INVALID) {
cp += 6;
while (isblank((unsigned char)*cp))
cp++;
if (*cp == ':') {
cp++;
while (isblank((unsigned char)*cp))
cp++;
ep = cp;
while (*ep != '\0' && !isblank((unsigned char)*ep))
ep++;
if (*ep != '\0') {
digest->digest_type = digest_type;
digest->digest_str = estrndup(cp, (size_t)(ep - cp));
cp = ep + 1;
while (isblank((unsigned char)*cp))
cp++;
*cmnd = cp;
DPRINTF1("%s digest %s for %s",
digest_type == SUDO_DIGEST_SHA224 ? "sha224" :
digest_type == SUDO_DIGEST_SHA256 ? "sha256" :
digest_type == SUDO_DIGEST_SHA384 ? "sha384" :
"sha512", digest->digest_str, cp);
debug_return_ptr(digest);
}
}
}
}
debug_return_ptr(NULL);
}
/*
* Walk through search results and return true if we have a command match,
* false if disallowed and UNSPEC if not matched.
*/
static int
sudo_ldap_check_command(LDAP *ld, LDAPMessage *entry, int *setenv_implied)
{
struct sudo_digest digest, *allowed_digest = NULL;
struct berval **bv, **p;
char *allowed_cmnd, *allowed_args, *val;
bool foundbang;
int ret = UNSPEC;
debug_decl(sudo_ldap_check_command, SUDO_DEBUG_LDAP)
if (!entry)
debug_return_bool(ret);
bv = ldap_get_values_len(ld, entry, "sudoCommand");
if (bv == NULL)
debug_return_bool(ret);
for (p = bv; *p != NULL && ret != false; p++) {
val = (*p)->bv_val;
/* Match against ALL ? */
if (!strcmp(val, "ALL")) {
ret = true;
if (setenv_implied != NULL)
*setenv_implied = true;
DPRINTF2("ldap sudoCommand '%s' ... MATCH!", val);
continue;
}
/* check for sha-2 digest */
allowed_digest = sudo_ldap_extract_digest(&val, &digest);
/* check for !command */
if (*val == '!') {
foundbang = true;
allowed_cmnd = estrdup(1 + val); /* !command */
} else {
foundbang = false;
allowed_cmnd = estrdup(val); /* command */
}
/* split optional args away from command */
allowed_args = strchr(allowed_cmnd, ' ');
if (allowed_args)
*allowed_args++ = '\0';
/* check the command like normal */
if (command_matches(allowed_cmnd, allowed_args, allowed_digest)) {
/*
* If allowed (no bang) set ret but keep on checking.
* If disallowed (bang), exit loop.
*/
ret = foundbang ? false : true;
}
DPRINTF2("ldap sudoCommand '%s' ... %s",
val, ret == true ? "MATCH!" : "not");
efree(allowed_cmnd); /* cleanup */
if (allowed_digest != NULL)
efree(allowed_digest->digest_str);
}
ldap_value_free_len(bv); /* more cleanup */
debug_return_bool(ret);
}
/*
* Search for boolean "option" in sudoOption.
* Returns true if found and allowed, false if negated, else UNSPEC.
*/
static int
sudo_ldap_check_bool(LDAP *ld, LDAPMessage *entry, char *option)
{
struct berval **bv, **p;
char ch, *var;
int ret = UNSPEC;
debug_decl(sudo_ldap_check_bool, SUDO_DEBUG_LDAP)
if (entry == NULL)
debug_return_bool(ret);
bv = ldap_get_values_len(ld, entry, "sudoOption");
if (bv == NULL)
debug_return_bool(ret);
/* walk through options */
for (p = bv; *p != NULL; p++) {
var = (*p)->bv_val;;
DPRINTF2("ldap sudoOption: '%s'", var);
if ((ch = *var) == '!')
var++;
if (strcmp(var, option) == 0)
ret = (ch != '!');
}
ldap_value_free_len(bv);
debug_return_bool(ret);
}
/*
* Read sudoOption and modify the defaults as we go. This is used once
* from the cn=defaults entry and also once when a final sudoRole is matched.
*/
static void
sudo_ldap_parse_options(LDAP *ld, LDAPMessage *entry)
{
struct berval **bv, **p;
char op, *var, *val;
debug_decl(sudo_ldap_parse_options, SUDO_DEBUG_LDAP)
if (entry == NULL)
debug_return;
bv = ldap_get_values_len(ld, entry, "sudoOption");
if (bv == NULL)
debug_return;
/* walk through options */
for (p = bv; *p != NULL; p++) {
var = estrdup((*p)->bv_val);
DPRINTF2("ldap sudoOption: '%s'", var);
/* check for equals sign past first char */
val = strchr(var, '=');
if (val > var) {
*val++ = '\0'; /* split on = and truncate var */
op = *(val - 2); /* peek for += or -= cases */
if (op == '+' || op == '-') {
*(val - 2) = '\0'; /* found, remove extra char */
/* case var+=val or var-=val */
set_default(var, val, (int) op);
} else {
/* case var=val */
set_default(var, val, true);
}
} else if (*var == '!') {
/* case !var Boolean False */
set_default(var + 1, NULL, false);
} else {
/* case var Boolean True */
set_default(var, NULL, true);
}
efree(var);
}
ldap_value_free_len(bv);
debug_return;
}
/*
* Build an LDAP timefilter.
*
* Stores a filter in the buffer that makes sure only entries
* are selected that have a sudoNotBefore in the past and a
* sudoNotAfter in the future, i.e. a filter of the following
* structure (spaced out a little more for better readability:
*
* (&
* (|
* (!(sudoNotAfter=*))
* (sudoNotAfter>__now__)
* )
* (|
* (!(sudoNotBefore=*))
* (sudoNotBefore<__now__)
* )
* )
*
* If either the sudoNotAfter or sudoNotBefore attributes are missing,
* no time restriction shall be imposed.
*/
static int
sudo_ldap_timefilter(char *buffer, size_t buffersize)
{
struct tm *tp;
time_t now;
char timebuffer[sizeof("20120727121554.0Z")];
int bytes = 0;
debug_decl(sudo_ldap_timefilter, SUDO_DEBUG_LDAP)
/* Make sure we have a formatted timestamp for __now__. */
time(&now);
if ((tp = gmtime(&now)) == NULL) {
warning(_("unable to get GMT time"));
goto done;
}
/* Format the timestamp according to the RFC. */
if (strftime(timebuffer, sizeof(timebuffer), "%Y%m%d%H%M%S.0Z", tp) == 0) {
warningx(_("unable to format timestamp"));
goto done;
}
/* Build filter. */
bytes = snprintf(buffer, buffersize, "(&(|(!(sudoNotAfter=*))(sudoNotAfter>=%s))(|(!(sudoNotBefore=*))(sudoNotBefore<=%s)))",
timebuffer, timebuffer);
if (bytes < 0 || bytes >= buffersize) {
warning(_("unable to build time filter"));
bytes = 0;
}
done:
debug_return_int(bytes);
}
/*
* Builds up a filter to search for default settings
*/
static char *
sudo_ldap_build_default_filter(void)
{
char *filt;
debug_decl(sudo_ldap_build_default_filter, SUDO_DEBUG_LDAP)
if (ldap_conf.search_filter)
easprintf(&filt, "(&%s(cn=defaults))", ldap_conf.search_filter);
else
filt = estrdup("cn=defaults");
debug_return_str(filt);
}
/*
* Determine length of query value after escaping characters
* as per RFC 4515.
*/
static size_t
sudo_ldap_value_len(const char *value)
{
const char *s;
size_t len = 0;
for (s = value; *s != '\0'; s++) {
switch (*s) {
case '\\':
case '(':
case ')':
case '*':
len += 2;
break;
}
}
len += (size_t)(s - value);
return len;
}
/*
* Like strlcat() but escapes characters as per RFC 4515.
*/
static size_t
sudo_ldap_value_cat(char *dst, const char *src, size_t size)
{
char *d = dst;
const char *s = src;
size_t n = size;
size_t dlen;
/* Find the end of dst and adjust bytes left but don't go past end */
while (n-- != 0 && *d != '\0')
d++;
dlen = d - dst;
n = size - dlen;
if (n == 0)
return dlen + strlen(s);
while (*s != '\0') {
switch (*s) {
case '\\':
if (n < 3)
goto done;
*d++ = '\\';
*d++ = '5';
*d++ = 'c';
n -= 3;
break;
case '(':
if (n < 3)
goto done;
*d++ = '\\';
*d++ = '2';
*d++ = '8';
n -= 3;
break;
case ')':
if (n < 3)
goto done;
*d++ = '\\';
*d++ = '2';
*d++ = '9';
n -= 3;
break;
case '*':
if (n < 3)
goto done;
*d++ = '\\';
*d++ = '2';
*d++ = 'a';
n -= 3;
break;
default:
if (n < 1)
goto done;
*d++ = *s;
n--;
break;
}
s++;
}
done:
*d = '\0';
while (*s != '\0')
s++;
return dlen + (s - src); /* count does not include NUL */
}
/*
* Builds up a filter to check against LDAP.
*/
static char *
sudo_ldap_build_pass1(struct passwd *pw)
{
struct group *grp;
char *buf, timebuffer[TIMEFILTER_LENGTH + 1], gidbuf[MAX_UID_T_LEN + 1];
struct group_list *grlist;
size_t sz = 0;
int i;
debug_decl(sudo_ldap_build_pass1, SUDO_DEBUG_LDAP)
/* If there is a filter, allocate space for the global AND. */
if (ldap_conf.timed || ldap_conf.search_filter)
sz += 3;
/* Add LDAP search filter if present. */
if (ldap_conf.search_filter)
sz += strlen(ldap_conf.search_filter);
/* Then add (|(sudoUser=USERNAME)(sudoUser=ALL)) + NUL */
sz += 29 + sudo_ldap_value_len(pw->pw_name);
/* Add space for primary and supplementary groups and gids */
if ((grp = sudo_getgrgid(pw->pw_gid)) != NULL) {
sz += 12 + sudo_ldap_value_len(grp->gr_name);
}
sz += 13 + MAX_UID_T_LEN;
if ((grlist = sudo_get_grlist(pw)) != NULL) {
for (i = 0; i < grlist->ngroups; i++) {
if (grp != NULL && strcasecmp(grlist->groups[i], grp->gr_name) == 0)
continue;
sz += 12 + sudo_ldap_value_len(grlist->groups[i]);
}
for (i = 0; i < grlist->ngids; i++) {
if (pw->pw_gid == grlist->gids[i])
continue;
sz += 13 + MAX_UID_T_LEN;
}
}
/* If timed, add space for time limits. */
if (ldap_conf.timed)
sz += TIMEFILTER_LENGTH;
buf = emalloc(sz);
*buf = '\0';
/*
* If timed or using a search filter, start a global AND clause to
* contain the search filter, search criteria, and time restriction.
*/
if (ldap_conf.timed || ldap_conf.search_filter)
(void) strlcpy(buf, "(&", sz);
if (ldap_conf.search_filter)
(void) strlcat(buf, ldap_conf.search_filter, sz);
/* Global OR + sudoUser=user_name filter */
(void) strlcat(buf, "(|(sudoUser=", sz);
(void) sudo_ldap_value_cat(buf, pw->pw_name, sz);
(void) strlcat(buf, ")", sz);
/* Append primary group and gid */
if (grp != NULL) {
(void) strlcat(buf, "(sudoUser=%", sz);
(void) sudo_ldap_value_cat(buf, grp->gr_name, sz);
(void) strlcat(buf, ")", sz);
}
(void) snprintf(gidbuf, sizeof(gidbuf), "%u", (unsigned int)pw->pw_gid);
(void) strlcat(buf, "(sudoUser=%#", sz);
(void) strlcat(buf, gidbuf, sz);
(void) strlcat(buf, ")", sz);
/* Append supplementary groups and gids */
if (grlist != NULL) {
for (i = 0; i < grlist->ngroups; i++) {
if (grp != NULL && strcasecmp(grlist->groups[i], grp->gr_name) == 0)
continue;
(void) strlcat(buf, "(sudoUser=%", sz);
(void) sudo_ldap_value_cat(buf, grlist->groups[i], sz);
(void) strlcat(buf, ")", sz);
}
for (i = 0; i < grlist->ngids; i++) {
if (pw->pw_gid == grlist->gids[i])
continue;
(void) snprintf(gidbuf, sizeof(gidbuf), "%u",
(unsigned int)grlist->gids[i]);
(void) strlcat(buf, "(sudoUser=%#", sz);
(void) strlcat(buf, gidbuf, sz);
(void) strlcat(buf, ")", sz);
}
}
/* Done with groups. */
if (grlist != NULL)
sudo_grlist_delref(grlist);
if (grp != NULL)
sudo_gr_delref(grp);
/* Add ALL to list and end the global OR */
if (strlcat(buf, "(sudoUser=ALL)", sz) >= sz)
fatalx(_("sudo_ldap_build_pass1 allocation mismatch"));
/* Add the time restriction, or simply end the global OR. */
if (ldap_conf.timed) {
strlcat(buf, ")", sz); /* closes the global OR */
sudo_ldap_timefilter(timebuffer, sizeof(timebuffer));
strlcat(buf, timebuffer, sz);
} else if (ldap_conf.search_filter) {
strlcat(buf, ")", sz); /* closes the global OR */
}
strlcat(buf, ")", sz); /* closes the global OR or the global AND */
debug_return_str(buf);
}
/*
* Builds up a filter to check against non-Unix group
* entries in LDAP, including netgroups.
*/
static char *
sudo_ldap_build_pass2(void)
{
char *filt, timebuffer[TIMEFILTER_LENGTH + 1];
debug_decl(sudo_ldap_build_pass2, SUDO_DEBUG_LDAP)
if (ldap_conf.timed)
sudo_ldap_timefilter(timebuffer, sizeof(timebuffer));
/*
* Match all sudoUsers beginning with '+' or '%:'.
* If a search filter or time restriction is specified,
* those get ANDed in to the expression.
*/
if (def_group_plugin) {
easprintf(&filt, "%s%s(|(sudoUser=+*)(sudoUser=%%:*))%s%s",
(ldap_conf.timed || ldap_conf.search_filter) ? "(&" : "",
ldap_conf.search_filter ? ldap_conf.search_filter : "",
ldap_conf.timed ? timebuffer : "",
(ldap_conf.timed || ldap_conf.search_filter) ? ")" : "");
} else {
easprintf(&filt, "%s%s(sudoUser=+*)%s%s",
(ldap_conf.timed || ldap_conf.search_filter) ? "(&" : "",
ldap_conf.search_filter ? ldap_conf.search_filter : "",
ldap_conf.timed ? timebuffer : "",
(ldap_conf.timed || ldap_conf.search_filter) ? ")" : "");
}
debug_return_str(filt);
}
static void
sudo_ldap_read_secret(const char *path)
{
FILE *fp;
char buf[LINE_MAX], *cp;
debug_decl(sudo_ldap_read_secret, SUDO_DEBUG_LDAP)
if ((fp = fopen(path_ldap_secret, "r")) != NULL) {
if (fgets(buf, sizeof(buf), fp) != NULL) {
if ((cp = strchr(buf, '\n')) != NULL)
*cp = '\0';
/* copy to bindpw and binddn */
efree(ldap_conf.bindpw);
ldap_conf.bindpw = estrdup(buf);
efree(ldap_conf.binddn);
ldap_conf.binddn = ldap_conf.rootbinddn;
ldap_conf.rootbinddn = NULL;
}
fclose(fp);
}
debug_return;
}
/*
* Look up keyword in config tables.
* Returns true if found, else false.
*/
static bool
sudo_ldap_parse_keyword(const char *keyword, const char *value,
struct ldap_config_table *table)
{
struct ldap_config_table *cur;
debug_decl(sudo_ldap_parse_keyword, SUDO_DEBUG_LDAP)
/* Look up keyword in config tables */
for (cur = table; cur->conf_str != NULL; cur++) {
if (strcasecmp(keyword, cur->conf_str) == 0) {
switch (cur->type) {
case CONF_DEREF_VAL:
if (strcasecmp(value, "searching") == 0)
*(int *)(cur->valp) = LDAP_DEREF_SEARCHING;
else if (strcasecmp(value, "finding") == 0)
*(int *)(cur->valp) = LDAP_DEREF_FINDING;
else if (strcasecmp(value, "always") == 0)
*(int *)(cur->valp) = LDAP_DEREF_ALWAYS;
else
*(int *)(cur->valp) = LDAP_DEREF_NEVER;
break;
case CONF_BOOL:
*(int *)(cur->valp) = atobool(value) == true;
break;
case CONF_INT:
*(int *)(cur->valp) = atoi(value);
break;
case CONF_STR:
efree(*(char **)(cur->valp));
*(char **)(cur->valp) = estrdup(value);
break;
case CONF_LIST_STR:
{
struct ldap_config_list_str **p;
size_t len = strlen(value);
if (len > 0) {
p = (struct ldap_config_list_str **)cur->valp;
while (*p != NULL)
p = &(*p)->next;
*p = emalloc(sizeof(struct ldap_config_list_str) + len);
memcpy((*p)->val, value, len + 1);
(*p)->next = NULL;
}
}
break;
}
debug_return_bool(true);
}
}
debug_return_bool(false);
}
static bool
sudo_ldap_read_config(void)
{
FILE *fp;
char *cp, *keyword, *value, *line = NULL;
size_t linesize = 0;
debug_decl(sudo_ldap_read_config, SUDO_DEBUG_LDAP)
/* defaults */
ldap_conf.version = 3;
ldap_conf.port = -1;
ldap_conf.tls_checkpeer = -1;
ldap_conf.timelimit = -1;
ldap_conf.timeout = -1;
ldap_conf.bind_timelimit = -1;
ldap_conf.use_sasl = -1;
ldap_conf.rootuse_sasl = -1;
ldap_conf.deref = -1;
if ((fp = fopen(path_ldap_conf, "r")) == NULL)
debug_return_bool(false);
while (sudo_parseln(&line, &linesize, NULL, fp) != -1) {
if (*line == '\0')
continue; /* skip empty line */
/* split into keyword and value */
keyword = cp = line;
while (*cp && !isblank((unsigned char) *cp))
cp++;
if (*cp)
*cp++ = '\0'; /* terminate keyword */
/* skip whitespace before value */
while (isblank((unsigned char) *cp))
cp++;
value = cp;
/* Look up keyword in config tables */
if (!sudo_ldap_parse_keyword(keyword, value, ldap_conf_global))
sudo_ldap_parse_keyword(keyword, value, ldap_conf_conn);
}
free(line);
fclose(fp);
if (!ldap_conf.host)
ldap_conf.host = estrdup("localhost");
DPRINTF1("LDAP Config Summary");
DPRINTF1("===================");
if (ldap_conf.uri) {
struct ldap_config_list_str *uri = ldap_conf.uri;
do {
DPRINTF1("uri %s", uri->val);
} while ((uri = uri->next) != NULL);
} else {
DPRINTF1("host %s",
ldap_conf.host ? ldap_conf.host : "(NONE)");
DPRINTF1("port %d", ldap_conf.port);
}
DPRINTF1("ldap_version %d", ldap_conf.version);
if (ldap_conf.base) {
struct ldap_config_list_str *base = ldap_conf.base;
do {
DPRINTF1("sudoers_base %s", base->val);
} while ((base = base->next) != NULL);
} else {
DPRINTF1("sudoers_base %s", "(NONE: LDAP disabled)");
}
if (ldap_conf.search_filter) {
DPRINTF1("search_filter %s", ldap_conf.search_filter);
}
DPRINTF1("binddn %s",
ldap_conf.binddn ? ldap_conf.binddn : "(anonymous)");
DPRINTF1("bindpw %s",
ldap_conf.bindpw ? ldap_conf.bindpw : "(anonymous)");
if (ldap_conf.bind_timelimit > 0) {
DPRINTF1("bind_timelimit %d", ldap_conf.bind_timelimit);
}
if (ldap_conf.timelimit > 0) {
DPRINTF1("timelimit %d", ldap_conf.timelimit);
}
if (ldap_conf.deref != -1) {
DPRINTF1("deref %d", ldap_conf.deref);
}
DPRINTF1("ssl %s", ldap_conf.ssl ? ldap_conf.ssl : "(no)");
if (ldap_conf.tls_checkpeer != -1) {
DPRINTF1("tls_checkpeer %s",
ldap_conf.tls_checkpeer ? "(yes)" : "(no)");
}
if (ldap_conf.tls_cacertfile != NULL) {
DPRINTF1("tls_cacertfile %s", ldap_conf.tls_cacertfile);
}
if (ldap_conf.tls_cacertdir != NULL) {
DPRINTF1("tls_cacertdir %s", ldap_conf.tls_cacertdir);
}
if (ldap_conf.tls_random_file != NULL) {
DPRINTF1("tls_random_file %s", ldap_conf.tls_random_file);
}
if (ldap_conf.tls_cipher_suite != NULL) {
DPRINTF1("tls_cipher_suite %s", ldap_conf.tls_cipher_suite);
}
if (ldap_conf.tls_certfile != NULL) {
DPRINTF1("tls_certfile %s", ldap_conf.tls_certfile);
}
if (ldap_conf.tls_keyfile != NULL) {
DPRINTF1("tls_keyfile %s", ldap_conf.tls_keyfile);
}
#ifdef HAVE_LDAP_SASL_INTERACTIVE_BIND_S
if (ldap_conf.use_sasl != -1) {
DPRINTF1("use_sasl %s", ldap_conf.use_sasl ? "yes" : "no");
DPRINTF1("sasl_auth_id %s",
ldap_conf.sasl_auth_id ? ldap_conf.sasl_auth_id : "(NONE)");
DPRINTF1("rootuse_sasl %d",
ldap_conf.rootuse_sasl);
DPRINTF1("rootsasl_auth_id %s",
ldap_conf.rootsasl_auth_id ? ldap_conf.rootsasl_auth_id : "(NONE)");
DPRINTF1("sasl_secprops %s",
ldap_conf.sasl_secprops ? ldap_conf.sasl_secprops : "(NONE)");
DPRINTF1("krb5_ccname %s",
ldap_conf.krb5_ccname ? ldap_conf.krb5_ccname : "(NONE)");
}
#endif
DPRINTF1("===================");
if (!ldap_conf.base)
debug_return_bool(false); /* if no base is defined, ignore LDAP */
if (ldap_conf.bind_timelimit > 0)
ldap_conf.bind_timelimit *= 1000; /* convert to ms */
/*
* Interpret SSL option
*/
if (ldap_conf.ssl != NULL) {
if (strcasecmp(ldap_conf.ssl, "start_tls") == 0)
ldap_conf.ssl_mode = SUDO_LDAP_STARTTLS;
else if (atobool(ldap_conf.ssl) == true)
ldap_conf.ssl_mode = SUDO_LDAP_SSL;
}
#if defined(HAVE_LDAPSSL_SET_STRENGTH) && !defined(LDAP_OPT_X_TLS_REQUIRE_CERT)
if (ldap_conf.tls_checkpeer != -1) {
ldapssl_set_strength(NULL,
ldap_conf.tls_checkpeer ? LDAPSSL_AUTH_CERT : LDAPSSL_AUTH_WEAK);
}
#endif
#ifndef HAVE_LDAP_INITIALIZE
/* Convert uri list to host list if no ldap_initialize(). */
if (ldap_conf.uri) {
struct ldap_config_list_str *uri = ldap_conf.uri;
if (sudo_ldap_parse_uri(uri) != 0)
debug_return_bool(false);
do {
ldap_conf.uri = uri->next;
efree(uri);
} while ((uri = ldap_conf.uri));
ldap_conf.port = LDAP_PORT;
}
#endif
if (!ldap_conf.uri) {
/* Use port 389 for plaintext LDAP and port 636 for SSL LDAP */
if (ldap_conf.port < 0)
ldap_conf.port =
ldap_conf.ssl_mode == SUDO_LDAP_SSL ? LDAPS_PORT : LDAP_PORT;
#ifdef HAVE_LDAP_CREATE
/*
* Cannot specify port directly to ldap_create(), each host must
* include :port to override the default.
*/
if (ldap_conf.port != LDAP_PORT)
sudo_ldap_conf_add_ports();
#endif
}
/* If search filter is not parenthesized, make it so. */
if (ldap_conf.search_filter && ldap_conf.search_filter[0] != '(') {
size_t len = strlen(ldap_conf.search_filter);
cp = ldap_conf.search_filter;
ldap_conf.search_filter = emalloc(len + 3);
ldap_conf.search_filter[0] = '(';
memcpy(ldap_conf.search_filter + 1, cp, len);
ldap_conf.search_filter[len + 1] = ')';
ldap_conf.search_filter[len + 2] = '\0';
efree(cp);
}
/* If rootbinddn set, read in /etc/ldap.secret if it exists. */
if (ldap_conf.rootbinddn)
sudo_ldap_read_secret(path_ldap_secret);
#ifdef HAVE_LDAP_SASL_INTERACTIVE_BIND_S
/*
* Make sure we can open the file specified by krb5_ccname.
*/
if (ldap_conf.krb5_ccname != NULL) {
if (strncasecmp(ldap_conf.krb5_ccname, "FILE:", 5) == 0 ||
strncasecmp(ldap_conf.krb5_ccname, "WRFILE:", 7) == 0) {
value = ldap_conf.krb5_ccname +
(ldap_conf.krb5_ccname[4] == ':' ? 5 : 7);
if ((fp = fopen(value, "r")) != NULL) {
sudo_debug_printf(SUDO_DEBUG_INFO,
"using krb5 credential cache: %s", value);
fclose(fp);
} else {
/* Can't open it, just ignore the entry. */
sudo_debug_printf(SUDO_DEBUG_WARN|SUDO_DEBUG_LINENO,
"unable to open krb5 credential cache: %s", value);
efree(ldap_conf.krb5_ccname);
ldap_conf.krb5_ccname = NULL;
}
}
}
#endif
debug_return_bool(true);
}
/*
* Extract the dn from an entry and return the first rdn from it.
*/
static char *
sudo_ldap_get_first_rdn(LDAP *ld, LDAPMessage *entry)
{
#ifdef HAVE_LDAP_STR2DN
char *dn, *rdn = NULL;
LDAPDN tmpDN;
debug_decl(sudo_ldap_get_first_rdn, SUDO_DEBUG_LDAP)
if ((dn = ldap_get_dn(ld, entry)) == NULL)
debug_return_str(NULL);
if (ldap_str2dn(dn, &tmpDN, LDAP_DN_FORMAT_LDAP) == LDAP_SUCCESS) {
ldap_rdn2str(tmpDN[0], &rdn, LDAP_DN_FORMAT_UFN);
ldap_dnfree(tmpDN);
}
ldap_memfree(dn);
debug_return_str(rdn);
#else
char *dn, **edn;
debug_decl(sudo_ldap_get_first_rdn, SUDO_DEBUG_LDAP)
if ((dn = ldap_get_dn(ld, entry)) == NULL)
return NULL;
edn = ldap_explode_dn(dn, 1);
ldap_memfree(dn);
debug_return_str(edn ? edn[0] : NULL);
#endif
}
/*
* Fetch and display the global Options.
*/
static int
sudo_ldap_display_defaults(struct sudo_nss *nss, struct passwd *pw,
struct lbuf *lbuf)
{
struct berval **bv, **p;
struct timeval tv, *tvp = NULL;
struct ldap_config_list_str *base;
struct sudo_ldap_handle *handle = nss->handle;
LDAP *ld;
LDAPMessage *entry, *result;
char *prefix, *filt;
int rc, count = 0;
debug_decl(sudo_ldap_display_defaults, SUDO_DEBUG_LDAP)
if (handle == NULL || handle->ld == NULL)
goto done;
ld = handle->ld;
filt = sudo_ldap_build_default_filter();
for (base = ldap_conf.base; base != NULL; base = base->next) {
if (ldap_conf.timeout > 0) {
tv.tv_sec = ldap_conf.timeout;
tv.tv_usec = 0;
tvp = &tv;
}
result = NULL;
rc = ldap_search_ext_s(ld, base->val, LDAP_SCOPE_SUBTREE,
filt, NULL, 0, NULL, NULL, tvp, 0, &result);
if (rc == LDAP_SUCCESS && (entry = ldap_first_entry(ld, result))) {
bv = ldap_get_values_len(ld, entry, "sudoOption");
if (bv != NULL) {
if (lbuf->len == 0 || isspace((unsigned char)lbuf->buf[lbuf->len - 1]))
prefix = " ";
else
prefix = ", ";
for (p = bv; *p != NULL; p++) {
lbuf_append(lbuf, "%s%s", prefix, (*p)->bv_val);
prefix = ", ";
count++;
}
ldap_value_free_len(bv);
}
}
if (result)
ldap_msgfree(result);
}
efree(filt);
done:
debug_return_int(count);
}
/*
* STUB
*/
static int
sudo_ldap_display_bound_defaults(struct sudo_nss *nss, struct passwd *pw,
struct lbuf *lbuf)
{
debug_decl(sudo_ldap_display_bound_defaults, SUDO_DEBUG_LDAP)
debug_return_int(0);
}
/*
* Print a record in the short form, ala file sudoers.
*/
static int
sudo_ldap_display_entry_short(LDAP *ld, LDAPMessage *entry, struct lbuf *lbuf)
{
struct berval **bv, **p;
int count = 0;
debug_decl(sudo_ldap_display_entry_short, SUDO_DEBUG_LDAP)
lbuf_append(lbuf, " (");
/* get the RunAsUser Values from the entry */
bv = ldap_get_values_len(ld, entry, "sudoRunAsUser");
if (bv == NULL)
bv = ldap_get_values_len(ld, entry, "sudoRunAs");
if (bv != NULL) {
for (p = bv; *p != NULL; p++) {
lbuf_append(lbuf, "%s%s", p != bv ? ", " : "", (*p)->bv_val);
}
ldap_value_free_len(bv);
} else
lbuf_append(lbuf, "%s", def_runas_default);
/* get the RunAsGroup Values from the entry */
bv = ldap_get_values_len(ld, entry, "sudoRunAsGroup");
if (bv != NULL) {
lbuf_append(lbuf, " : ");
for (p = bv; *p != NULL; p++) {
lbuf_append(lbuf, "%s%s", p != bv ? ", " : "", (*p)->bv_val);
}
ldap_value_free_len(bv);
}
lbuf_append(lbuf, ") ");
/* get the Option Values from the entry */
bv = ldap_get_values_len(ld, entry, "sudoOption");
if (bv != NULL) {
for (p = bv; *p != NULL; p++) {
char *cp = (*p)->bv_val;
if (*cp == '!')
cp++;
if (strcmp(cp, "authenticate") == 0)
lbuf_append(lbuf, (*p)->bv_val[0] == '!' ?
"NOPASSWD: " : "PASSWD: ");
else if (strcmp(cp, "noexec") == 0)
lbuf_append(lbuf, (*p)->bv_val[0] == '!' ?
"EXEC: " : "NOEXEC: ");
else if (strcmp(cp, "setenv") == 0)
lbuf_append(lbuf, (*p)->bv_val[0] == '!' ?
"NOSETENV: " : "SETENV: ");
}
ldap_value_free_len(bv);
}
/* get the Command Values from the entry */
bv = ldap_get_values_len(ld, entry, "sudoCommand");
if (bv != NULL) {
for (p = bv; *p != NULL; p++) {
lbuf_append(lbuf, "%s%s", p != bv ? ", " : "", (*p)->bv_val);
count++;
}
ldap_value_free_len(bv);
}
lbuf_append(lbuf, "\n");
debug_return_int(count);
}
/*
* Print a record in the long form.
*/
static int
sudo_ldap_display_entry_long(LDAP *ld, LDAPMessage *entry, struct lbuf *lbuf)
{
struct berval **bv, **p;
char *rdn;
int count = 0;
debug_decl(sudo_ldap_display_entry_long, SUDO_DEBUG_LDAP)
/* extract the dn, only show the first rdn */
rdn = sudo_ldap_get_first_rdn(ld, entry);
if (rdn != NULL)
lbuf_append(lbuf, _("\nLDAP Role: %s\n"), rdn);
else
lbuf_append(lbuf, _("\nLDAP Role: UNKNOWN\n"));
if (rdn)
ldap_memfree(rdn);
/* get the RunAsUser Values from the entry */
lbuf_append(lbuf, " RunAsUsers: ");
bv = ldap_get_values_len(ld, entry, "sudoRunAsUser");
if (bv == NULL)
bv = ldap_get_values_len(ld, entry, "sudoRunAs");
if (bv != NULL) {
for (p = bv; *p != NULL; p++) {
lbuf_append(lbuf, "%s%s", p != bv ? ", " : "", (*p)->bv_val);
}
ldap_value_free_len(bv);
} else
lbuf_append(lbuf, "%s", def_runas_default);
lbuf_append(lbuf, "\n");
/* get the RunAsGroup Values from the entry */
bv = ldap_get_values_len(ld, entry, "sudoRunAsGroup");
if (bv != NULL) {
lbuf_append(lbuf, " RunAsGroups: ");
for (p = bv; *p != NULL; p++) {
lbuf_append(lbuf, "%s%s", p != bv ? ", " : "", (*p)->bv_val);
}
ldap_value_free_len(bv);
lbuf_append(lbuf, "\n");
}
/* get the Option Values from the entry */
bv = ldap_get_values_len(ld, entry, "sudoOption");
if (bv != NULL) {
lbuf_append(lbuf, " Options: ");
for (p = bv; *p != NULL; p++) {
lbuf_append(lbuf, "%s%s", p != bv ? ", " : "", (*p)->bv_val);
}
ldap_value_free_len(bv);
lbuf_append(lbuf, "\n");
}
/*
* Display order attribute if present. This attribute is single valued,
* so there is no need for a loop.
*/
bv = ldap_get_values_len(ld, entry, "sudoOrder");
if (bv != NULL) {
if (*bv != NULL) {
lbuf_append(lbuf, _(" Order: %s\n"), (*bv)->bv_val);
}
ldap_value_free_len(bv);
}
/* Get the command values from the entry. */
bv = ldap_get_values_len(ld, entry, "sudoCommand");
if (bv != NULL) {
lbuf_append(lbuf, _(" Commands:\n"));
for (p = bv; *p != NULL; p++) {
lbuf_append(lbuf, "\t%s\n", (*p)->bv_val);
count++;
}
ldap_value_free_len(bv);
}
debug_return_int(count);
}
/*
* Like sudo_ldap_lookup(), except we just print entries.
*/
static int
sudo_ldap_display_privs(struct sudo_nss *nss, struct passwd *pw,
struct lbuf *lbuf)
{
struct sudo_ldap_handle *handle = nss->handle;
LDAP *ld;
struct ldap_result *lres;
LDAPMessage *entry;
int i, count = 0;
debug_decl(sudo_ldap_display_privs, SUDO_DEBUG_LDAP)
if (handle == NULL || handle->ld == NULL)
goto done;
ld = handle->ld;
DPRINTF1("ldap search for command list");
lres = sudo_ldap_result_get(nss, pw);
/* Display all matching entries. */
for (i = 0; i < lres->nentries; i++) {
entry = lres->entries[i].entry;
if (long_list)
count += sudo_ldap_display_entry_long(ld, entry, lbuf);
else
count += sudo_ldap_display_entry_short(ld, entry, lbuf);
}
done:
debug_return_int(count);
}
static int
sudo_ldap_display_cmnd(struct sudo_nss *nss, struct passwd *pw)
{
struct sudo_ldap_handle *handle = nss->handle;
LDAP *ld;
struct ldap_result *lres;
LDAPMessage *entry;
bool found = false;
int i;
debug_decl(sudo_ldap_display_cmnd, SUDO_DEBUG_LDAP)
if (handle == NULL || handle->ld == NULL)
goto done;
ld = handle->ld;
/*
* The sudo_ldap_result_get() function returns all nodes that match
* the user and the host.
*/
DPRINTF1("ldap search for command list");
lres = sudo_ldap_result_get(nss, pw);
for (i = 0; i < lres->nentries; i++) {
entry = lres->entries[i].entry;
if (sudo_ldap_check_command(ld, entry, NULL) &&
sudo_ldap_check_runas(ld, entry)) {
found = true;
goto done;
}
}
done:
if (found)
printf("%s%s%s\n", safe_cmnd ? safe_cmnd : user_cmnd,
user_args ? " " : "", user_args ? user_args : "");
debug_return_bool(!found);
}
#ifdef HAVE_LDAP_SASL_INTERACTIVE_BIND_S
static int
sudo_ldap_sasl_interact(LDAP *ld, unsigned int flags, void *_auth_id,
void *_interact)
{
char *auth_id = (char *)_auth_id;
sasl_interact_t *interact = (sasl_interact_t *)_interact;
debug_decl(sudo_ldap_sasl_interact, SUDO_DEBUG_LDAP)
for (; interact->id != SASL_CB_LIST_END; interact++) {
if (interact->id != SASL_CB_USER)
debug_return_int(LDAP_PARAM_ERROR);
if (auth_id != NULL)
interact->result = auth_id;
else if (interact->defresult != NULL)
interact->result = interact->defresult;
else
interact->result = "";
interact->len = strlen(interact->result);
#if SASL_VERSION_MAJOR < 2
interact->result = estrdup(interact->result);
#endif /* SASL_VERSION_MAJOR < 2 */
}
debug_return_int(LDAP_SUCCESS);
}
#endif /* HAVE_LDAP_SASL_INTERACTIVE_BIND_S */
/*
* Set LDAP options from the specified options table
*/
static int
sudo_ldap_set_options_table(LDAP *ld, struct ldap_config_table *table)
{
struct ldap_config_table *cur;
int ival, rc, errors = 0;
char *sval;
debug_decl(sudo_ldap_set_options_table, SUDO_DEBUG_LDAP)
for (cur = table; cur->conf_str != NULL; cur++) {
if (cur->opt_val == -1)
continue;
switch (cur->type) {
case CONF_BOOL:
case CONF_INT:
ival = *(int *)(cur->valp);
if (ival >= 0) {
DPRINTF1("ldap_set_option: %s -> %d", cur->conf_str, ival);
rc = ldap_set_option(ld, cur->opt_val, &ival);
if (rc != LDAP_OPT_SUCCESS) {
warningx("ldap_set_option: %s -> %d: %s",
cur->conf_str, ival, ldap_err2string(rc));
errors++;
}
}
break;
case CONF_STR:
sval = *(char **)(cur->valp);
if (sval != NULL) {
DPRINTF1("ldap_set_option: %s -> %s", cur->conf_str, sval);
rc = ldap_set_option(ld, cur->opt_val, sval);
if (rc != LDAP_OPT_SUCCESS) {
warningx("ldap_set_option: %s -> %s: %s",
cur->conf_str, sval, ldap_err2string(rc));
errors++;
}
}
break;
}
}
debug_return_int(errors ? -1 : 0);
}
/*
* Set LDAP options based on the global config table.
*/
static int
sudo_ldap_set_options_global(void)
{
int rc;
debug_decl(sudo_ldap_set_options_global, SUDO_DEBUG_LDAP)
/* Set ber options */
#ifdef LBER_OPT_DEBUG_LEVEL
if (ldap_conf.ldap_debug)
ber_set_option(NULL, LBER_OPT_DEBUG_LEVEL, &ldap_conf.ldap_debug);
#endif
/* Parse global LDAP options table. */
rc = sudo_ldap_set_options_table(NULL, ldap_conf_global);
if (rc == -1)
debug_return_int(-1);
debug_return_int(0);
}
/*
* Set LDAP options based on the per-connection config table.
*/
static int
sudo_ldap_set_options_conn(LDAP *ld)
{
int rc;
debug_decl(sudo_ldap_set_options_conn, SUDO_DEBUG_LDAP)
/* Parse per-connection LDAP options table. */
rc = sudo_ldap_set_options_table(ld, ldap_conf_conn);
if (rc == -1)
debug_return_int(-1);
#ifdef LDAP_OPT_TIMEOUT
/* Convert timeout to a timeval */
if (ldap_conf.timeout > 0) {
struct timeval tv;
tv.tv_sec = ldap_conf.timeout;
tv.tv_usec = 0;
DPRINTF1("ldap_set_option(LDAP_OPT_TIMEOUT, %d)", ldap_conf.timeout);
rc = ldap_set_option(ld, LDAP_OPT_TIMEOUT, &tv);
if (rc != LDAP_OPT_SUCCESS) {
warningx("ldap_set_option(TIMEOUT, %d): %s",
ldap_conf.timeout, ldap_err2string(rc));
}
}
#endif
#ifdef LDAP_OPT_NETWORK_TIMEOUT
/* Convert bind_timelimit to a timeval */
if (ldap_conf.bind_timelimit > 0) {
struct timeval tv;
tv.tv_sec = ldap_conf.bind_timelimit / 1000;
tv.tv_usec = 0;
DPRINTF1("ldap_set_option(LDAP_OPT_NETWORK_TIMEOUT, %d)",
ldap_conf.bind_timelimit / 1000);
rc = ldap_set_option(ld, LDAP_OPT_NETWORK_TIMEOUT, &tv);
# if !defined(LDAP_OPT_CONNECT_TIMEOUT) || LDAP_VENDOR_VERSION != 510
/* Tivoli Directory Server 6.3 libs always return a (bogus) error. */
if (rc != LDAP_OPT_SUCCESS) {
warningx("ldap_set_option(NETWORK_TIMEOUT, %d): %s",
ldap_conf.bind_timelimit / 1000, ldap_err2string(rc));
}
# endif
}
#endif
#if defined(LDAP_OPT_X_TLS) && !defined(HAVE_LDAPSSL_INIT)
if (ldap_conf.ssl_mode == SUDO_LDAP_SSL) {
int val = LDAP_OPT_X_TLS_HARD;
DPRINTF1("ldap_set_option(LDAP_OPT_X_TLS, LDAP_OPT_X_TLS_HARD)");
rc = ldap_set_option(ld, LDAP_OPT_X_TLS, &val);
if (rc != LDAP_SUCCESS) {
warningx("ldap_set_option(LDAP_OPT_X_TLS, LDAP_OPT_X_TLS_HARD): %s",
ldap_err2string(rc));
debug_return_int(-1);
}
}
#endif
debug_return_int(0);
}
/*
* Create a new sudo_ldap_result structure.
*/
static struct ldap_result *
sudo_ldap_result_alloc(void)
{
struct ldap_result *result;
debug_decl(sudo_ldap_result_alloc, SUDO_DEBUG_LDAP)
debug_return_ptr(ecalloc(1, sizeof(*result)));
}
/*
* Free the ldap result structure
*/
static void
sudo_ldap_result_free(struct ldap_result *lres)
{
struct ldap_search_list *s;
debug_decl(sudo_ldap_result_free, SUDO_DEBUG_LDAP)
if (lres != NULL) {
if (lres->nentries) {
efree(lres->entries);
lres->entries = NULL;
}
if (lres->searches) {
while ((s = lres->searches) != NULL) {
ldap_msgfree(s->searchresult);
lres->searches = s->next;
efree(s);
}
}
efree(lres);
}
debug_return;
}
/*
* Add a search result to the ldap_result structure.
*/
static struct ldap_search_list *
sudo_ldap_result_add_search(struct ldap_result *lres, LDAP *ldap,
LDAPMessage *searchresult)
{
struct ldap_search_list *s, *news;
debug_decl(sudo_ldap_result_add_search, SUDO_DEBUG_LDAP)
news = ecalloc(1, sizeof(struct ldap_search_list));
news->ldap = ldap;
news->searchresult = searchresult;
/* news->next = NULL; */
/* Add entry to the end of the chain (XXX - tailq instead?). */
if (lres->searches) {
for (s = lres->searches; s->next != NULL; s = s->next)
continue;
s->next = news;
} else {
lres->searches = news;
}
debug_return_ptr(news);
}
/*
* Connect to the LDAP server specified by ld
*/
static int
sudo_ldap_bind_s(LDAP *ld)
{
int rc;
#ifdef HAVE_LDAP_SASL_INTERACTIVE_BIND_S
const char *old_ccname = user_ccname;
# ifdef HAVE_GSS_KRB5_CCACHE_NAME
unsigned int status;
# endif
#endif
debug_decl(sudo_ldap_bind_s, SUDO_DEBUG_LDAP)
#ifdef HAVE_LDAP_SASL_INTERACTIVE_BIND_S
if (ldap_conf.rootuse_sasl == true ||
(ldap_conf.rootuse_sasl != false && ldap_conf.use_sasl == true)) {
void *auth_id = ldap_conf.rootsasl_auth_id ?
ldap_conf.rootsasl_auth_id : ldap_conf.sasl_auth_id;
if (ldap_conf.krb5_ccname != NULL) {
# ifdef HAVE_GSS_KRB5_CCACHE_NAME
if (gss_krb5_ccache_name(&status, ldap_conf.krb5_ccname, &old_ccname)
!= GSS_S_COMPLETE) {
old_ccname = NULL;
sudo_debug_printf(SUDO_DEBUG_WARN|SUDO_DEBUG_LINENO,
"gss_krb5_ccache_name() failed: %d", status);
}
# else
sudo_setenv("KRB5CCNAME", ldap_conf.krb5_ccname, true);
# endif
}
rc = ldap_sasl_interactive_bind_s(ld, ldap_conf.binddn, "GSSAPI",
NULL, NULL, LDAP_SASL_QUIET, sudo_ldap_sasl_interact, auth_id);
if (ldap_conf.krb5_ccname != NULL) {
# ifdef HAVE_GSS_KRB5_CCACHE_NAME
if (gss_krb5_ccache_name(&status, old_ccname, NULL) != GSS_S_COMPLETE)
sudo_debug_printf(SUDO_DEBUG_WARN|SUDO_DEBUG_LINENO,
"gss_krb5_ccache_name() failed: %d", status);
# else
if (old_ccname != NULL)
sudo_setenv("KRB5CCNAME", old_ccname, true);
else
sudo_unsetenv("KRB5CCNAME");
# endif
}
if (rc != LDAP_SUCCESS) {
warningx("ldap_sasl_interactive_bind_s(): %s",
ldap_err2string(rc));
debug_return_int(-1);
}
DPRINTF1("ldap_sasl_interactive_bind_s() ok");
} else
#endif /* HAVE_LDAP_SASL_INTERACTIVE_BIND_S */
#ifdef HAVE_LDAP_SASL_BIND_S
{
struct berval bv;
bv.bv_val = ldap_conf.bindpw ? ldap_conf.bindpw : "";
bv.bv_len = strlen(bv.bv_val);
rc = ldap_sasl_bind_s(ld, ldap_conf.binddn, LDAP_SASL_SIMPLE, &bv,
NULL, NULL, NULL);
if (rc != LDAP_SUCCESS) {
warningx("ldap_sasl_bind_s(): %s", ldap_err2string(rc));
debug_return_int(-1);
}
DPRINTF1("ldap_sasl_bind_s() ok");
}
#else
{
rc = ldap_simple_bind_s(ld, ldap_conf.binddn, ldap_conf.bindpw);
if (rc != LDAP_SUCCESS) {
warningx("ldap_simple_bind_s(): %s", ldap_err2string(rc));
debug_return_int(-1);
}
DPRINTF1("ldap_simple_bind_s() ok");
}
#endif
debug_return_int(0);
}
/*
* Open a connection to the LDAP server.
* Returns 0 on success and non-zero on failure.
*/
static int
sudo_ldap_open(struct sudo_nss *nss)
{
LDAP *ld;
int rc;
bool ldapnoinit = false;
struct sudo_ldap_handle *handle;
debug_decl(sudo_ldap_open, SUDO_DEBUG_LDAP)
if (!sudo_ldap_read_config())
debug_return_int(-1);
/* Prevent reading of user ldaprc and system defaults. */
if (sudo_getenv("LDAPNOINIT") == NULL) {
ldapnoinit = true;
sudo_setenv("LDAPNOINIT", "1", true);
}
/* Set global LDAP options */
if (sudo_ldap_set_options_global() < 0)
debug_return_int(-1);
/* Connect to LDAP server */
#ifdef HAVE_LDAP_INITIALIZE
if (ldap_conf.uri != NULL) {
char *buf = sudo_ldap_join_uri(ldap_conf.uri);
DPRINTF2("ldap_initialize(ld, %s)", buf);
rc = ldap_initialize(&ld, buf);
efree(buf);
if (rc != LDAP_SUCCESS)
warningx(_("unable to initialize LDAP: %s"), ldap_err2string(rc));
} else
#endif
rc = sudo_ldap_init(&ld, ldap_conf.host, ldap_conf.port);
if (rc != LDAP_SUCCESS)
debug_return_int(-1);
/* Set LDAP per-connection options */
if (sudo_ldap_set_options_conn(ld) < 0)
debug_return_int(-1);
if (ldapnoinit)
sudo_unsetenv("LDAPNOINIT");
if (ldap_conf.ssl_mode == SUDO_LDAP_STARTTLS) {
#if defined(HAVE_LDAP_START_TLS_S)
rc = ldap_start_tls_s(ld, NULL, NULL);
if (rc != LDAP_SUCCESS) {
warningx("ldap_start_tls_s(): %s", ldap_err2string(rc));
debug_return_int(-1);
}
DPRINTF1("ldap_start_tls_s() ok");
#elif defined(HAVE_LDAP_SSL_CLIENT_INIT) && defined(HAVE_LDAP_START_TLS_S_NP)
if (ldap_ssl_client_init(ldap_conf.tls_keyfile, ldap_conf.tls_keypw, 0, &rc) != LDAP_SUCCESS) {
warningx("ldap_ssl_client_init(): %s", ldap_err2string(rc));
debug_return_int(-1);
}
rc = ldap_start_tls_s_np(ld, NULL);
if (rc != LDAP_SUCCESS) {
warningx("ldap_start_tls_s_np(): %s", ldap_err2string(rc));
debug_return_int(-1);
}
DPRINTF1("ldap_start_tls_s_np() ok");
#else
warningx(_("start_tls specified but LDAP libs do not support ldap_start_tls_s() or ldap_start_tls_s_np()"));
#endif /* !HAVE_LDAP_START_TLS_S && !HAVE_LDAP_START_TLS_S_NP */
}
/* Actually connect */
if (sudo_ldap_bind_s(ld) != 0)
debug_return_int(-1);
/* Create a handle container. */
handle = ecalloc(1, sizeof(struct sudo_ldap_handle));
handle->ld = ld;
/* handle->result = NULL; */
/* handle->username = NULL; */
/* handle->grlist = NULL; */
nss->handle = handle;
debug_return_int(0);
}
static int
sudo_ldap_setdefs(struct sudo_nss *nss)
{
struct ldap_config_list_str *base;
struct sudo_ldap_handle *handle = nss->handle;
struct timeval tv, *tvp = NULL;
LDAP *ld;
LDAPMessage *entry, *result;
char *filt;
int rc;
debug_decl(sudo_ldap_setdefs, SUDO_DEBUG_LDAP)
if (handle == NULL || handle->ld == NULL)
debug_return_int(-1);
ld = handle->ld;
filt = sudo_ldap_build_default_filter();
DPRINTF1("Looking for cn=defaults: %s", filt);
for (base = ldap_conf.base; base != NULL; base = base->next) {
if (ldap_conf.timeout > 0) {
tv.tv_sec = ldap_conf.timeout;
tv.tv_usec = 0;
tvp = &tv;
}
result = NULL;
rc = ldap_search_ext_s(ld, base->val, LDAP_SCOPE_SUBTREE,
filt, NULL, 0, NULL, NULL, tvp, 0, &result);
if (rc == LDAP_SUCCESS && (entry = ldap_first_entry(ld, result))) {
DPRINTF1("found:%s", ldap_get_dn(ld, entry));
sudo_ldap_parse_options(ld, entry);
} else {
DPRINTF1("no default options found in %s", base->val);
}
if (result)
ldap_msgfree(result);
}
efree(filt);
debug_return_int(0);
}
/*
* like sudoers_lookup() - only LDAP style
*/
static int
sudo_ldap_lookup(struct sudo_nss *nss, int ret, int pwflag)
{
struct sudo_ldap_handle *handle = nss->handle;
LDAP *ld;
LDAPMessage *entry;
int i, rc, setenv_implied;
struct ldap_result *lres = NULL;
debug_decl(sudo_ldap_lookup, SUDO_DEBUG_LDAP)
if (handle == NULL || handle->ld == NULL)
debug_return_int(ret);
ld = handle->ld;
/* Fetch list of sudoRole entries that match user and host. */
lres = sudo_ldap_result_get(nss, sudo_user.pw);
/*
* The following queries are only determine whether or not a
* password is required, so the order of the entries doesn't matter.
*/
if (pwflag) {
int doauth = UNSPEC;
int matched = UNSPEC;
enum def_tuple pwcheck =
(pwflag == -1) ? never : sudo_defs_table[pwflag].sd_un.tuple;
DPRINTF1("perform search for pwflag %d", pwflag);
for (i = 0; i < lres->nentries; i++) {
entry = lres->entries[i].entry;
if ((pwcheck == any && doauth != false) ||
(pwcheck == all && doauth == false)) {
doauth = sudo_ldap_check_bool(ld, entry, "authenticate");
}
/* Only check the command when listing another user. */
if (user_uid == 0 || list_pw == NULL ||
user_uid == list_pw->pw_uid ||
sudo_ldap_check_command(ld, entry, NULL)) {
matched = true;
break;
}
}
if (matched || user_uid == 0) {
SET(ret, VALIDATE_OK);
CLR(ret, VALIDATE_NOT_OK);
if (def_authenticate) {
switch (pwcheck) {
case always:
SET(ret, FLAG_CHECK_USER);
break;
case all:
case any:
if (doauth == false)
def_authenticate = false;
break;
case never:
def_authenticate = false;
break;
default:
break;
}
}
}
goto done;
}
DPRINTF1("searching LDAP for sudoers entries");
setenv_implied = false;
for (i = 0; i < lres->nentries; i++) {
entry = lres->entries[i].entry;
if (!sudo_ldap_check_runas(ld, entry))
continue;
rc = sudo_ldap_check_command(ld, entry, &setenv_implied);
if (rc != UNSPEC) {
/* We have a match. */
DPRINTF1("Command %sallowed", rc == true ? "" : "NOT ");
if (rc == true) {
DPRINTF1("LDAP entry: %p", entry);
/* Apply entry-specific options. */
if (setenv_implied)
def_setenv = true;
sudo_ldap_parse_options(ld, entry);
#ifdef HAVE_SELINUX
/* Set role and type if not specified on command line. */
if (user_role == NULL)
user_role = def_role;
if (user_type == NULL)
user_type = def_type;
#endif /* HAVE_SELINUX */
SET(ret, VALIDATE_OK);
CLR(ret, VALIDATE_NOT_OK);
} else {
SET(ret, VALIDATE_NOT_OK);
CLR(ret, VALIDATE_OK);
}
break;
}
}
done:
DPRINTF1("done with LDAP searches");
DPRINTF1("user_matches=%d", lres->user_matches);
DPRINTF1("host_matches=%d", lres->host_matches);
if (!ISSET(ret, VALIDATE_OK)) {
/* No matching entries. */
if (pwflag && list_pw == NULL)
SET(ret, FLAG_NO_CHECK);
}
if (lres->user_matches)
CLR(ret, FLAG_NO_USER);
if (lres->host_matches)
CLR(ret, FLAG_NO_HOST);
DPRINTF1("sudo_ldap_lookup(%d)=0x%02x", pwflag, ret);
debug_return_int(ret);
}
/*
* Comparison function for ldap_entry_wrapper structures, descending order.
*/
static int
ldap_entry_compare(const void *a, const void *b)
{
const struct ldap_entry_wrapper *aw = a;
const struct ldap_entry_wrapper *bw = b;
debug_decl(ldap_entry_compare, SUDO_DEBUG_LDAP)
debug_return_int(bw->order < aw->order ? -1 :
(bw->order > aw->order ? 1 : 0));
}
/*
* Find the last entry in the list of searches, usually the
* one currently being used to add entries.
* XXX - use a tailq instead?
*/
static struct ldap_search_list *
sudo_ldap_result_last_search(struct ldap_result *lres)
{
struct ldap_search_list *result = lres->searches;
debug_decl(sudo_ldap_result_last_search, SUDO_DEBUG_LDAP)
if (result) {
while (result->next)
result = result->next;
}
debug_return_ptr(result);
}
/*
* Add an entry to the result structure.
*/
static struct ldap_entry_wrapper *
sudo_ldap_result_add_entry(struct ldap_result *lres, LDAPMessage *entry)
{
struct ldap_search_list *last;
struct berval **bv;
double order = 0.0;
char *ep;
debug_decl(sudo_ldap_result_add_entry, SUDO_DEBUG_LDAP)
/* Determine whether the entry has the sudoOrder attribute. */
last = sudo_ldap_result_last_search(lres);
bv = ldap_get_values_len(last->ldap, entry, "sudoOrder");
if (bv != NULL) {
if (ldap_count_values_len(bv) > 0) {
/* Get the value of this attribute, 0 if not present. */
DPRINTF2("order attribute raw: %s", (*bv)->bv_val);
order = strtod((*bv)->bv_val, &ep);
if (ep == (*bv)->bv_val || *ep != '\0') {
warningx(_("invalid sudoOrder attribute: %s"), (*bv)->bv_val);
order = 0.0;
}
DPRINTF2("order attribute: %f", order);
}
ldap_value_free_len(bv);
}
/*
* Enlarge the array of entry wrappers as needed, preallocating blocks
* of 100 entries to save on allocation time.
*/
if (++lres->nentries > lres->allocated_entries) {
lres->allocated_entries += ALLOCATION_INCREMENT;
lres->entries = erealloc3(lres->entries, lres->allocated_entries,
sizeof(lres->entries[0]));
}
/* Fill in the new entry and return it. */
lres->entries[lres->nentries - 1].entry = entry;
lres->entries[lres->nentries - 1].order = order;
debug_return_ptr(&lres->entries[lres->nentries - 1]);
}
/*
* Free the ldap result structure in the sudo_nss handle.
*/
static void
sudo_ldap_result_free_nss(struct sudo_nss *nss)
{
struct sudo_ldap_handle *handle = nss->handle;
debug_decl(sudo_ldap_result_free_nss, SUDO_DEBUG_LDAP)
if (handle->result != NULL) {
DPRINTF1("removing reusable search result");
sudo_ldap_result_free(handle->result);
if (handle->username) {
efree(handle->username);
handle->username = NULL;
}
handle->grlist = NULL;
handle->result = NULL;
}
debug_return;
}
/*
* Perform the LDAP query for the user or return a cached query if
* there is one for this user.
*/
static struct ldap_result *
sudo_ldap_result_get(struct sudo_nss *nss, struct passwd *pw)
{
struct sudo_ldap_handle *handle = nss->handle;
struct ldap_config_list_str *base;
struct ldap_result *lres;
struct timeval tv, *tvp = NULL;
LDAPMessage *entry, *result;
LDAP *ld = handle->ld;
int pass, rc;
char *filt;
debug_decl(sudo_ldap_result_get, SUDO_DEBUG_LDAP)
/*
* If we already have a cached result, return it so we don't have to
* have to contact the LDAP server again.
*/
if (handle->result) {
if (handle->grlist == user_group_list &&
strcmp(pw->pw_name, handle->username) == 0) {
DPRINTF1("reusing previous result (user %s) with %d entries",
handle->username, handle->result->nentries);
debug_return_ptr(handle->result);
}
/* User mismatch, cached result cannot be used. */
DPRINTF1("removing result (user %s), new search (user %s)",
handle->username, pw->pw_name);
sudo_ldap_result_free_nss(nss);
}
/*
* Okay - time to search for anything that matches this user
* Lets limit it to only two queries of the LDAP server
*
* The first pass will look by the username, groups, and
* the keyword ALL. We will then inspect the results that
* came back from the query. We don't need to inspect the
* sudoUser in this pass since the LDAP server already scanned
* it for us.
*
* The second pass will return all the entries that contain non-
* Unix groups, including netgroups. Then we take the non-Unix
* groups returned and try to match them against the username.
*
* Since we have to sort the possible entries before we make a
* decision, we perform the queries and store all of the results in
* an ldap_result object. The results are then sorted by sudoOrder.
*/
lres = sudo_ldap_result_alloc();
for (pass = 0; pass < 2; pass++) {
filt = pass ? sudo_ldap_build_pass2() : sudo_ldap_build_pass1(pw);
DPRINTF1("ldap search '%s'", filt);
for (base = ldap_conf.base; base != NULL; base = base->next) {
DPRINTF1("searching from base '%s'",
base->val);
if (ldap_conf.timeout > 0) {
tv.tv_sec = ldap_conf.timeout;
tv.tv_usec = 0;
tvp = &tv;
}
result = NULL;
rc = ldap_search_ext_s(ld, base->val, LDAP_SCOPE_SUBTREE, filt,
NULL, 0, NULL, NULL, tvp, 0, &result);
if (rc != LDAP_SUCCESS) {
DPRINTF1("nothing found for '%s'", filt);
continue;
}
lres->user_matches = true;
/* Add the seach result to list of search results. */
DPRINTF1("adding search result");
sudo_ldap_result_add_search(lres, ld, result);
LDAP_FOREACH(entry, ld, result) {
if ((!pass ||
sudo_ldap_check_non_unix_group(ld, entry, pw)) &&
sudo_ldap_check_host(ld, entry)) {
lres->host_matches = true;
sudo_ldap_result_add_entry(lres, entry);
}
}
DPRINTF1("result now has %d entries", lres->nentries);
}
efree(filt);
}
/* Sort the entries by the sudoOrder attribute. */
DPRINTF1("sorting remaining %d entries", lres->nentries);
qsort(lres->entries, lres->nentries, sizeof(lres->entries[0]),
ldap_entry_compare);
/* Store everything in the sudo_nss handle. */
handle->result = lres;
handle->username = estrdup(pw->pw_name);
handle->grlist = user_group_list;
debug_return_ptr(lres);
}
/*
* Shut down the LDAP connection.
*/
static int
sudo_ldap_close(struct sudo_nss *nss)
{
struct sudo_ldap_handle *handle = nss->handle;
debug_decl(sudo_ldap_close, SUDO_DEBUG_LDAP)
if (handle != NULL) {
/* Free the result before unbinding; it may use the LDAP connection. */
sudo_ldap_result_free_nss(nss);
/* Unbind and close the LDAP connection. */
if (handle->ld != NULL) {
ldap_unbind_ext_s(handle->ld, NULL, NULL);
handle->ld = NULL;
}
/* Free the handle container. */
efree(nss->handle);
nss->handle = NULL;
}
debug_return_int(0);
}
/*
* STUB
*/
static int
sudo_ldap_parse(struct sudo_nss *nss)
{
return 0;
}
#if 0
/*
* Create an ldap_result from an LDAP search result.
*
* This function is currently not used anywhere, it is left here as
* an example of how to use the cached searches.
*/
static struct ldap_result *
sudo_ldap_result_from_search(LDAP *ldap, LDAPMessage *searchresult)
{
/*
* An ldap_result is built from several search results, which are
* organized in a list. The head of the list is maintained in the
* ldap_result structure, together with the wrappers that point
* to individual entries, this has to be initialized first.
*/
struct ldap_result *result = sudo_ldap_result_alloc();
/*
* Build a new list node for the search result, this creates the
* list node.
*/
struct ldap_search_list *last = sudo_ldap_result_add_search(result,
ldap, searchresult);
/*
* Now add each entry in the search result to the array of of entries
* in the ldap_result object.
*/
LDAPMessage *entry;
LDAP_FOREACH(entry, last->ldap, last->searchresult) {
sudo_ldap_result_add_entry(result, entry);
}
DPRINTF1("sudo_ldap_result_from_search: %d entries found", result->nentries);
return result;
}
#endif
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