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d92c82ea3f5e04cacfb2500c7bb6651b6bc9c5dd
sudo/plugins/sudoers/ldap.c
Todd C. Miller d92c82ea3f Add support for multiple sudoers_base entries in ldap.conf. 
From Joachim Henke
2010-06-15 10:33:30 -04:00

1937 lines
52 KiB
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/*
* Copyright (c) 2003-2010 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/param.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>
#else
# ifdef HAVE_STRINGS_H
# include <strings.h>
# endif
#endif /* HAVE_STRING_H */
#if defined(HAVE_MALLOC_H) && !defined(STDC_HEADERS)
# include <malloc.h>
#endif /* HAVE_MALLOC_H && !STDC_HEADERS */
#ifdef HAVE_UNISTD_H
# include <unistd.h>
#endif /* HAVE_UNISTD_H */
#include <ctype.h>
#include <pwd.h>
#include <grp.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.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"
#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
#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
#define LDAP_FOREACH(var, ld, res) \
for ((var) = ldap_first_entry((ld), (res)); \
(var) != NULL; \
(var) = ldap_next_entry((ld), (var)))
#define DPRINTF(args, level) if (ldap_conf.debug >= level) warningx args
#define CONF_BOOL 0
#define CONF_INT 1
#define CONF_STR 2
#define CONF_LIST_STR 4
#define SUDO_LDAP_SSL 1
#define SUDO_LDAP_STARTTLS 2
struct ldap_config_table {
const char *conf_str; /* config file string */
short type; /* CONF_BOOL, CONF_INT, CONF_STR */
short connected; /* connection-specific value? */
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 bind_timelimit;
int use_sasl;
int rootuse_sasl;
int ssl_mode;
char *host;
char *uri;
char *binddn;
char *bindpw;
char *rootbinddn;
struct ldap_config_list_str *base;
char *ssl;
char *tls_cacertfile;
char *tls_cacertdir;
char *tls_random_file;
char *tls_cipher_suite;
char *tls_certfile;
char *tls_keyfile;
char *sasl_auth_id;
char *rootsasl_auth_id;
char *sasl_secprops;
char *krb5_ccname;
} ldap_conf;
static struct ldap_config_table ldap_conf_table[] = {
{ "sudoers_debug", CONF_INT, FALSE, -1, &ldap_conf.debug },
{ "host", CONF_STR, FALSE, -1, &ldap_conf.host },
{ "port", CONF_INT, FALSE, -1, &ldap_conf.port },
{ "ssl", CONF_STR, FALSE, -1, &ldap_conf.ssl },
{ "sslpath", CONF_STR, FALSE, -1, &ldap_conf.tls_certfile },
{ "uri", CONF_STR, FALSE, -1, &ldap_conf.uri },
#ifdef LDAP_OPT_DEBUG_LEVEL
{ "debug", CONF_INT, FALSE, LDAP_OPT_DEBUG_LEVEL, &ldap_conf.ldap_debug },
#endif
#ifdef LDAP_OPT_PROTOCOL_VERSION
{ "ldap_version", CONF_INT, TRUE, LDAP_OPT_PROTOCOL_VERSION,
&ldap_conf.version },
#endif
#ifdef LDAP_OPT_X_TLS_REQUIRE_CERT
{ "tls_checkpeer", CONF_BOOL, FALSE, LDAP_OPT_X_TLS_REQUIRE_CERT,
&ldap_conf.tls_checkpeer },
#else
{ "tls_checkpeer", CONF_BOOL, FALSE, -1, &ldap_conf.tls_checkpeer },
#endif
#ifdef LDAP_OPT_X_TLS_CACERTFILE
{ "tls_cacertfile", CONF_STR, FALSE, LDAP_OPT_X_TLS_CACERTFILE,
&ldap_conf.tls_cacertfile },
#endif
#ifdef LDAP_OPT_X_TLS_CACERTDIR
{ "tls_cacertdir", CONF_STR, FALSE, LDAP_OPT_X_TLS_CACERTDIR,
&ldap_conf.tls_cacertdir },
#endif
#ifdef LDAP_OPT_X_TLS_RANDOM_FILE
{ "tls_randfile", CONF_STR, FALSE, LDAP_OPT_X_TLS_RANDOM_FILE,
&ldap_conf.tls_random_file },
#endif
#ifdef LDAP_OPT_X_TLS_CIPHER_SUITE
{ "tls_ciphers", CONF_STR, FALSE, LDAP_OPT_X_TLS_CIPHER_SUITE,
&ldap_conf.tls_cipher_suite },
#endif
#ifdef LDAP_OPT_X_TLS_CERTFILE
{ "tls_cert", CONF_STR, FALSE, LDAP_OPT_X_TLS_CERTFILE,
&ldap_conf.tls_certfile },
#else
{ "tls_cert", CONF_STR, FALSE, -1, &ldap_conf.tls_certfile },
#endif
#ifdef LDAP_OPT_X_TLS_KEYFILE
{ "tls_key", CONF_STR, FALSE, LDAP_OPT_X_TLS_KEYFILE,
&ldap_conf.tls_keyfile },
#else
{ "tls_key", CONF_STR, FALSE, -1, &ldap_conf.tls_keyfile },
#endif
#ifdef LDAP_OPT_NETWORK_TIMEOUT
{ "bind_timelimit", CONF_INT, TRUE, -1 /* needs timeval, set manually */,
&ldap_conf.bind_timelimit },
#elif defined(LDAP_X_OPT_CONNECT_TIMEOUT)
{ "bind_timelimit", CONF_INT, TRUE, LDAP_X_OPT_CONNECT_TIMEOUT,
&ldap_conf.bind_timelimit },
#endif
{ "timelimit", CONF_INT, TRUE, LDAP_OPT_TIMELIMIT, &ldap_conf.timelimit },
{ "binddn", CONF_STR, FALSE, -1, &ldap_conf.binddn },
{ "bindpw", CONF_STR, FALSE, -1, &ldap_conf.bindpw },
{ "rootbinddn", CONF_STR, FALSE, -1, &ldap_conf.rootbinddn },
{ "sudoers_base", CONF_LIST_STR, FALSE, -1, &ldap_conf.base },
#ifdef HAVE_LDAP_SASL_INTERACTIVE_BIND_S
{ "use_sasl", CONF_BOOL, FALSE, -1, &ldap_conf.use_sasl },
{ "sasl_auth_id", CONF_STR, FALSE, -1, &ldap_conf.sasl_auth_id },
{ "rootuse_sasl", CONF_BOOL, FALSE, -1, &ldap_conf.rootuse_sasl },
{ "rootsasl_auth_id", CONF_STR, FALSE, -1, &ldap_conf.rootsasl_auth_id },
# ifdef LDAP_OPT_X_SASL_SECPROPS
{ "sasl_secprops", CONF_STR, TRUE, LDAP_OPT_X_SASL_SECPROPS,
&ldap_conf.sasl_secprops },
# endif
{ "krb5_ccname", CONF_STR, FALSE, -1, &ldap_conf.krb5_ccname },
#endif /* HAVE_LDAP_SASL_INTERACTIVE_BIND_S */
{ 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);
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];
hostbuf[0] = '\0';
if (snprintf(defport, sizeof(defport), ":%d", ldap_conf.port) >= sizeof(defport))
errorx(1, "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;
}
}
free(ldap_conf.host);
ldap_conf.host = estrdup(hostbuf);
return;
toobig:
errorx(1, "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 char *uri_list)
{
char *buf, *uri, *host, *cp, *port;
char hostbuf[LINE_MAX];
int nldap = 0, nldaps = 0;
int rc = -1;
buf = estrdup(uri_list);
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);
goto done;
}
if (nldaps != 0) {
if (nldap != 0) {
warningx("cannot mix ldap and ldaps URIs");
goto done;
}
if (ldap_conf.ssl_mode == SUDO_LDAP_STARTTLS) {
warningx("cannot mix ldaps and starttls");
goto done;
}
ldap_conf.ssl_mode = SUDO_LDAP_SSL;
}
free(ldap_conf.host);
ldap_conf.host = estrdup(hostbuf);
rc = 0;
done:
efree(buf);
return(rc);
toobig:
errorx(1, "sudo_ldap_parse_uri: out of space building hostbuf");
}
#endif /* HAVE_LDAP_INITIALIZE */
static int
sudo_ldap_init(LDAP **ldp, const char *host, int port)
{
LDAP *ld = NULL;
int rc = LDAP_CONNECT_ERROR;
#ifdef HAVE_LDAPSSL_INIT
if (ldap_conf.ssl_mode == SUDO_LDAP_SSL) {
DPRINTF(("ldapssl_clientauth_init(%s, %s)",
ldap_conf.tls_certfile ? ldap_conf.tls_certfile : "NULL",
ldap_conf.tls_keyfile ? ldap_conf.tls_keyfile : "NULL"), 2);
rc = ldapssl_clientauth_init(ldap_conf.tls_certfile, NULL,
ldap_conf.tls_keyfile != NULL, ldap_conf.tls_keyfile, NULL);
/*
* Mozilla-derived SDKs have a bug starting with version 5.0
* where the path can no longer be a file name and must be a dir.
*/
if (rc != LDAP_SUCCESS) {
char *cp;
if (ldap_conf.tls_certfile) {
cp = strrchr(ldap_conf.tls_certfile, '/');
if (cp != NULL && strncmp(cp + 1, "cert", 4) == 0)
*cp = '\0';
}
if (ldap_conf.tls_keyfile) {
cp = strrchr(ldap_conf.tls_keyfile, '/');
if (cp != NULL && strncmp(cp + 1, "key", 3) == 0)
*cp = '\0';
}
DPRINTF(("ldapssl_clientauth_init(%s, %s)",
ldap_conf.tls_certfile ? ldap_conf.tls_certfile : "NULL",
ldap_conf.tls_keyfile ? ldap_conf.tls_keyfile : "NULL"), 2);
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));
goto done;
}
}
DPRINTF(("ldapssl_init(%s, %d, 1)", host, port), 2);
if ((ld = ldapssl_init(host, port, 1)) != NULL)
rc = LDAP_SUCCESS;
} else
#endif
{
#ifdef HAVE_LDAP_CREATE
DPRINTF(("ldap_create()"), 2);
if ((rc = ldap_create(&ld)) != LDAP_SUCCESS)
goto done;
DPRINTF(("ldap_set_option(LDAP_OPT_HOST_NAME, %s)", host), 2);
rc = ldap_set_option(ld, LDAP_OPT_HOST_NAME, host);
#else
DPRINTF(("ldap_init(%s, %d)", host, port), 2);
if ((ld = ldap_init(host, port)) != NULL)
rc = LDAP_SUCCESS;
#endif
}
done:
*ldp = ld;
return(rc);
}
/*
* Walk through search results and return TRUE if we have a matching
* netgroup, else FALSE.
*/
static int
sudo_ldap_check_user_netgroup(LDAP *ld, LDAPMessage *entry, char *user)
{
struct berval **bv, **p;
char *val;
int ret = FALSE;
if (!entry)
return(ret);
/* get the values from the entry */
bv = ldap_get_values_len(ld, entry, "sudoUser");
if (bv == NULL)
return(ret);
/* walk through values */
for (p = bv; *p != NULL && !ret; p++) {
val = (*p)->bv_val;
/* match any */
if (netgr_matches(val, NULL, NULL, user))
ret = TRUE;
DPRINTF(("ldap sudoUser netgroup '%s' ... %s", val,
ret ? "MATCH!" : "not"), 2);
}
ldap_value_free_len(bv); /* cleanup */
return(ret);
}
/*
* Walk through search results and return TRUE if we have a
* host match, else FALSE.
*/
static int
sudo_ldap_check_host(LDAP *ld, LDAPMessage *entry)
{
struct berval **bv, **p;
char *val;
int ret = FALSE;
if (!entry)
return(ret);
/* get the values from the entry */
bv = ldap_get_values_len(ld, entry, "sudoHost");
if (bv == NULL)
return(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;
DPRINTF(("ldap sudoHost '%s' ... %s", val,
ret ? "MATCH!" : "not"), 2);
}
ldap_value_free_len(bv); /* cleanup */
return(ret);
}
static int
sudo_ldap_check_runas_user(LDAP *ld, LDAPMessage *entry)
{
struct berval **bv, **p;
char *val;
int ret = FALSE;
if (!runas_pw)
return(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)
return(!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 (strcasecmp(val, runas_pw->pw_name) == 0)
ret = TRUE;
break;
}
DPRINTF(("ldap sudoRunAsUser '%s' ... %s", val,
ret ? "MATCH!" : "not"), 2);
}
ldap_value_free_len(bv); /* cleanup */
return(ret);
}
static int
sudo_ldap_check_runas_group(LDAP *ld, LDAPMessage *entry)
{
struct berval **bv, **p;
char *val;
int ret = FALSE;
/* runas_gr is only set if the user specified the -g flag */
if (!runas_gr)
return(UNSPEC);
/* get the values from the entry */
bv = ldap_get_values_len(ld, entry, "sudoRunAsGroup");
if (bv == NULL)
return(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;
DPRINTF(("ldap sudoRunAsGroup '%s' ... %s", val,
ret ? "MATCH!" : "not"), 2);
}
ldap_value_free_len(bv); /* cleanup */
return(ret);
}
/*
* Walk through search results and return TRUE if we have a runas match,
* else FALSE. RunAs info is optional.
*/
static int
sudo_ldap_check_runas(LDAP *ld, LDAPMessage *entry)
{
int ret;
if (!entry)
return(FALSE);
ret = sudo_ldap_check_runas_user(ld, entry) != FALSE &&
sudo_ldap_check_runas_group(ld, entry) != FALSE;
return(ret);
}
/*
* 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 berval **bv, **p;
char *allowed_cmnd, *allowed_args, *val;
int foundbang, ret = UNSPEC;
if (!entry)
return(ret);
bv = ldap_get_values_len(ld, entry, "sudoCommand");
if (bv == NULL)
return(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;
DPRINTF(("ldap sudoCommand '%s' ... MATCH!", val), 2);
continue;
}
/* 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)) {
/*
* If allowed (no bang) set ret but keep on checking.
* If disallowed (bang), exit loop.
*/
ret = foundbang ? FALSE : TRUE;
}
DPRINTF(("ldap sudoCommand '%s' ... %s", val,
ret == TRUE ? "MATCH!" : "not"), 2);
efree(allowed_cmnd); /* cleanup */
}
ldap_value_free_len(bv); /* more cleanup */
return(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;
if (entry == NULL)
return(UNSPEC);
bv = ldap_get_values_len(ld, entry, "sudoOption");
if (bv == NULL)
return(ret);
/* walk through options */
for (p = bv; *p != NULL; p++) {
var = (*p)->bv_val;;
DPRINTF(("ldap sudoOption: '%s'", var), 2);
if ((ch = *var) == '!')
var++;
if (strcmp(var, option) == 0)
ret = (ch != '!');
}
ldap_value_free_len(bv);
return(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;
if (entry == NULL)
return;
bv = ldap_get_values_len(ld, entry, "sudoOption");
if (bv == NULL)
return;
/* walk through options */
for (p = bv; *p != NULL; p++) {
var = estrdup((*p)->bv_val);
DPRINTF(("ldap sudoOption: '%s'", var), 2);
/* 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);
}
/*
* builds together a filter to check against ldap
*/
static char *
sudo_ldap_build_pass1(struct passwd *pw)
{
struct group *grp;
size_t sz;
char *buf;
int i;
/* Start with (|(sudoUser=USERNAME)(sudoUser=ALL)) + NUL */
sz = 29 + strlen(pw->pw_name);
/* Add space for groups */
if ((grp = sudo_getgrgid(pw->pw_gid)) != NULL)
sz += 12 + strlen(grp->gr_name); /* primary group */
for (i = 0; i < user_ngroups; i++) {
if (user_groups[i] == pw->pw_gid)
continue;
if ((grp = sudo_getgrgid(user_groups[i])) != NULL)
sz += 12 + strlen(grp->gr_name); /* supplementary group */
}
buf = emalloc(sz);
/* Global OR + sudoUser=user_name filter */
(void) strlcpy(buf, "(|(sudoUser=", sz);
(void) strlcat(buf, pw->pw_name, sz);
(void) strlcat(buf, ")", sz);
/* Append primary group */
if ((grp = sudo_getgrgid(pw->pw_gid)) != NULL) {
(void) strlcat(buf, "(sudoUser=%", sz);
(void) strlcat(buf, grp->gr_name, sz);
(void) strlcat(buf, ")", sz);
}
/* Append supplementary groups */
for (i = 0; i < user_ngroups; i++) {
if (user_groups[i] == pw->pw_gid)
continue;
if ((grp = sudo_getgrgid(user_groups[i])) != NULL) {
(void) strlcat(buf, "(sudoUser=%", sz);
(void) strlcat(buf, grp->gr_name, sz);
(void) strlcat(buf, ")", sz);
}
}
/* Add ALL to list and end the global OR */
if (strlcat(buf, "(sudoUser=ALL))", sz) >= sz)
errorx(1, "sudo_ldap_build_pass1 allocation mismatch");
return(buf);
}
static void
sudo_ldap_read_secret(const char *path)
{
FILE *fp;
char buf[LINE_MAX], *cp;
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);
}
}
static int
sudo_ldap_read_config(void)
{
FILE *fp;
char *cp, *keyword, *value;
struct ldap_config_table *cur;
/* defaults */
ldap_conf.version = 3;
ldap_conf.port = -1;
ldap_conf.tls_checkpeer = -1;
ldap_conf.timelimit = -1;
ldap_conf.bind_timelimit = -1;
ldap_conf.use_sasl = -1;
ldap_conf.rootuse_sasl = -1;
if ((fp = fopen(_PATH_LDAP_CONF, "r")) == NULL)
return(FALSE);
while ((cp = sudo_parseln(fp)) != NULL) {
if (*cp == '\0')
continue; /* skip empty line */
/* split into keyword and value */
keyword = cp;
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 table. */
for (cur = ldap_conf_table; cur->conf_str != NULL; cur++) {
if (strcasecmp(keyword, cur->conf_str) == 0) {
switch (cur->type) {
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;
}
break;
}
}
}
fclose(fp);
if (!ldap_conf.host)
ldap_conf.host = estrdup("localhost");
if (ldap_conf.bind_timelimit > 0)
ldap_conf.bind_timelimit *= 1000; /* convert to ms */
if (ldap_conf.debug > 1) {
sudo_printf(SUDO_CONV_ERROR_MSG, "LDAP Config Summary\n");
sudo_printf(SUDO_CONV_ERROR_MSG, "===================\n");
if (ldap_conf.uri) {
sudo_printf(SUDO_CONV_ERROR_MSG, "uri %s\n",
ldap_conf.uri);
} else {
sudo_printf(SUDO_CONV_ERROR_MSG, "host %s\n",
ldap_conf.host ? ldap_conf.host : "(NONE)");
sudo_printf(SUDO_CONV_ERROR_MSG, "port %d\n",
ldap_conf.port);
}
sudo_printf(SUDO_CONV_ERROR_MSG, "ldap_version %d\n",
ldap_conf.version);
if (ldap_conf.base) {
struct ldap_config_list_str *base = ldap_conf.base;
do {
sudo_printf(SUDO_CONV_ERROR_MSG, "sudoers_base %s\n",
base->val);
} while ((base = base->next) != NULL);
} else {
sudo_printf(SUDO_CONV_ERROR_MSG, "sudoers_base %s\n",
"(NONE: LDAP disabled)");
}
sudo_printf(SUDO_CONV_ERROR_MSG, "binddn %s\n",
ldap_conf.binddn ? ldap_conf.binddn : "(anonymous)");
sudo_printf(SUDO_CONV_ERROR_MSG, "bindpw %s\n",
ldap_conf.bindpw ? ldap_conf.bindpw : "(anonymous)");
if (ldap_conf.bind_timelimit > 0) {
sudo_printf(SUDO_CONV_ERROR_MSG, "bind_timelimit %d\n",
ldap_conf.bind_timelimit);
}
if (ldap_conf.timelimit > 0) {
sudo_printf(SUDO_CONV_ERROR_MSG, "timelimit %d\n",
ldap_conf.timelimit);
}
sudo_printf(SUDO_CONV_ERROR_MSG, "ssl %s\n",
ldap_conf.ssl ? ldap_conf.ssl : "(no)");
if (ldap_conf.tls_checkpeer != -1) {
sudo_printf(SUDO_CONV_ERROR_MSG, "tls_checkpeer %s\n",
ldap_conf.tls_checkpeer ? "(yes)" : "(no)");
}
if (ldap_conf.tls_cacertfile != NULL) {
sudo_printf(SUDO_CONV_ERROR_MSG, "tls_cacertfile %s\n",
ldap_conf.tls_cacertfile);
}
if (ldap_conf.tls_cacertdir != NULL) {
sudo_printf(SUDO_CONV_ERROR_MSG, "tls_cacertdir %s\n",
ldap_conf.tls_cacertdir);
}
if (ldap_conf.tls_random_file != NULL) {
sudo_printf(SUDO_CONV_ERROR_MSG, "tls_random_file %s\n",
ldap_conf.tls_random_file);
}
if (ldap_conf.tls_cipher_suite != NULL) {
sudo_printf(SUDO_CONV_ERROR_MSG, "tls_cipher_suite %s\n",
ldap_conf.tls_cipher_suite);
}
if (ldap_conf.tls_certfile != NULL) {
sudo_printf(SUDO_CONV_ERROR_MSG, "tls_certfile %s\n",
ldap_conf.tls_certfile);
}
if (ldap_conf.tls_keyfile != NULL) {
sudo_printf(SUDO_CONV_ERROR_MSG, "tls_keyfile %s\n",
ldap_conf.tls_keyfile);
}
#ifdef HAVE_LDAP_SASL_INTERACTIVE_BIND_S
if (ldap_conf.use_sasl != -1) {
sudo_printf(SUDO_CONV_ERROR_MSG, "use_sasl %s\n",
ldap_conf.use_sasl ? "yes" : "no");
sudo_printf(SUDO_CONV_ERROR_MSG, "sasl_auth_id %s\n",
ldap_conf.sasl_auth_id ? ldap_conf.sasl_auth_id : "(NONE)");
sudo_printf(SUDO_CONV_ERROR_MSG, "rootuse_sasl %d\n",
ldap_conf.rootuse_sasl);
sudo_printf(SUDO_CONV_ERROR_MSG, "rootsasl_auth_id %s\n",
ldap_conf.rootsasl_auth_id ? ldap_conf.rootsasl_auth_id : "(NONE)");
sudo_printf(SUDO_CONV_ERROR_MSG, "sasl_secprops %s\n",
ldap_conf.sasl_secprops ? ldap_conf.sasl_secprops : "(NONE)");
sudo_printf(SUDO_CONV_ERROR_MSG, "krb5_ccname %s\n",
ldap_conf.krb5_ccname ? ldap_conf.krb5_ccname : "(NONE)");
}
#endif
sudo_printf(SUDO_CONV_ERROR_MSG, "===================\n");
}
if (!ldap_conf.base)
return(FALSE); /* if no base is defined, ignore LDAP */
/*
* 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) {
if (sudo_ldap_parse_uri(ldap_conf.uri) != 0)
return(FALSE);
free(ldap_conf.uri);
ldap_conf.uri = NULL;
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 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) {
DPRINTF(("using krb5 credential cache: %s", value), 1);
fclose(fp);
} else {
/* Can't open it, just ignore the entry. */
DPRINTF(("unable to open krb5 credential cache: %s", value), 1);
efree(ldap_conf.krb5_ccname);
ldap_conf.krb5_ccname = NULL;
}
}
}
#endif
return(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;
if ((dn = ldap_get_dn(ld, entry)) == NULL)
return(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);
return(rdn);
#else
char *dn, **edn;
if ((dn = ldap_get_dn(ld, entry)) == NULL)
return(NULL);
edn = ldap_explode_dn(dn, 1);
ldap_memfree(dn);
return(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 ldap_config_list_str *base;
LDAP *ld = (LDAP *) nss->handle;
LDAPMessage *entry, *result;
char *prefix;
int rc, count = 0;
if (ld == NULL)
return(-1);
for (base = ldap_conf.base; base != NULL; base = base->next) {
result = NULL;
rc = ldap_search_ext_s(ld, base->val, LDAP_SCOPE_SUBTREE,
"cn=defaults", NULL, 0, NULL, NULL, NULL, 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, prefix, (*p)->bv_val, NULL);
prefix = ", ";
count++;
}
ldap_value_free_len(bv);
}
}
if (result)
ldap_msgfree(result);
}
return(count);
}
/*
* STUB
*/
static int
sudo_ldap_display_bound_defaults(struct sudo_nss *nss, struct passwd *pw,
struct lbuf *lbuf)
{
return(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;
lbuf_append(lbuf, " (", NULL);
/* 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++) {
if (p != bv)
lbuf_append(lbuf, ", ", NULL);
lbuf_append(lbuf, (*p)->bv_val, NULL);
}
ldap_value_free_len(bv);
} else
lbuf_append(lbuf, def_runas_default, NULL);
/* get the RunAsGroup Values from the entry */
bv = ldap_get_values_len(ld, entry, "sudoRunAsGroup");
if (bv != NULL) {
lbuf_append(lbuf, " : ", NULL);
for (p = bv; *p != NULL; p++) {
if (p != bv)
lbuf_append(lbuf, ", ", NULL);
lbuf_append(lbuf, (*p)->bv_val, NULL);
}
ldap_value_free_len(bv);
}
lbuf_append(lbuf, ") ", NULL);
/* get the Option Values from the entry */
bv = ldap_get_values_len(ld, entry, "sudoOption");
if (bv != NULL) {
char *cp, *tag;
for (p = bv; *p != NULL; p++) {
cp = (*p)->bv_val;
if (*cp == '!')
cp++;
tag = NULL;
if (strcmp(cp, "authenticate") == 0)
tag = (*p)->bv_val[0] == '!' ?
"NOPASSWD: " : "PASSWD: ";
else if (strcmp(cp, "noexec") == 0)
tag = (*p)->bv_val[0] == '!' ?
"EXEC: " : "NOEXEC: ";
else if (strcmp(cp, "setenv") == 0)
tag = (*p)->bv_val[0] == '!' ?
"NOSETENV: " : "SETENV: ";
if (tag != NULL)
lbuf_append(lbuf, tag, NULL);
/* XXX - ignores other options */
}
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++) {
if (p != bv)
lbuf_append(lbuf, ", ", NULL);
lbuf_append(lbuf, (*p)->bv_val, NULL);
count++;
}
ldap_value_free_len(bv);
}
lbuf_append(lbuf, "\n", NULL);
return(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;
/* extract the dn, only show the first rdn */
rdn = sudo_ldap_get_first_rdn(ld, entry);
lbuf_append(lbuf, "\nLDAP Role: ", rdn ? rdn : "UNKNOWN", "\n", NULL);
if (rdn)
ldap_memfree(rdn);
/* get the RunAsUser Values from the entry */
lbuf_append(lbuf, " RunAsUsers: ", NULL);
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++) {
if (p != bv)
lbuf_append(lbuf, ", ", NULL);
lbuf_append(lbuf, (*p)->bv_val, NULL);
}
ldap_value_free_len(bv);
} else
lbuf_append(lbuf, def_runas_default, NULL);
lbuf_append(lbuf, "\n", NULL);
/* get the RunAsGroup Values from the entry */
bv = ldap_get_values_len(ld, entry, "sudoRunAsGroup");
if (bv != NULL) {
lbuf_append(lbuf, " RunAsGroups: ", NULL);
for (p = bv; *p != NULL; p++) {
if (p != bv)
lbuf_append(lbuf, ", ", NULL);
lbuf_append(lbuf, (*p)->bv_val, NULL);
}
ldap_value_free_len(bv);
lbuf_append(lbuf, "\n", NULL);
}
/* get the Option Values from the entry */
bv = ldap_get_values_len(ld, entry, "sudoOption");
if (bv != NULL) {
lbuf_append(lbuf, " Options: ", NULL);
for (p = bv; *p != NULL; p++) {
if (p != bv)
lbuf_append(lbuf, ", ", NULL);
lbuf_append(lbuf, (*p)->bv_val, NULL);
}
ldap_value_free_len(bv);
lbuf_append(lbuf, "\n", NULL);
}
/* get the Command Values from the entry */
bv = ldap_get_values_len(ld, entry, "sudoCommand");
if (bv != NULL) {
lbuf_append(lbuf, " Commands:\n", NULL);
for (p = bv; *p != NULL; p++) {
lbuf_append(lbuf, "\t", (*p)->bv_val, "\n", NULL);
count++;
}
ldap_value_free_len(bv);
}
return(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 ldap_config_list_str *base;
LDAP *ld = (LDAP *) nss->handle;
LDAPMessage *entry, *result;
char *filt;
int rc, do_netgr, count = 0;
if (ld == NULL)
return(-1);
/*
* 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
* user netgroups. Then we take the netgroups returned and
* try to match them against the username.
*/
for (do_netgr = 0; do_netgr < 2; do_netgr++) {
filt = do_netgr ? estrdup("sudoUser=+*") : sudo_ldap_build_pass1(pw);
DPRINTF(("ldap search '%s'", filt), 1);
for (base = ldap_conf.base; base != NULL; base = base->next) {
result = NULL;
rc = ldap_search_ext_s(ld, base->val, LDAP_SCOPE_SUBTREE, filt,
NULL, 0, NULL, NULL, NULL, 0, &result);
if (rc != LDAP_SUCCESS)
continue; /* no entries for this pass */
/* print each matching entry */
LDAP_FOREACH(entry, ld, result) {
if ((!do_netgr ||
sudo_ldap_check_user_netgroup(ld, entry, pw->pw_name)) &&
sudo_ldap_check_host(ld, entry)) {
if (long_list)
count += sudo_ldap_display_entry_long(ld, entry, lbuf);
else
count += sudo_ldap_display_entry_short(ld, entry, lbuf);
}
}
ldap_msgfree(result);
}
efree(filt);
}
return(count);
}
static int
sudo_ldap_display_cmnd(struct sudo_nss *nss, struct passwd *pw)
{
struct ldap_config_list_str *base;
LDAP *ld = (LDAP *) nss->handle;
LDAPMessage *entry, *result; /* used for searches */
char *filt; /* used to parse attributes */
int rc, found, do_netgr; /* temp/final return values */
if (ld == NULL)
return(1);
/*
* 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
* user netgroups. Then we take the netgroups returned and
* try to match them against the username.
*/
for (found = FALSE, do_netgr = 0; !found && do_netgr < 2; do_netgr++) {
filt = do_netgr ? estrdup("sudoUser=+*") : sudo_ldap_build_pass1(pw);
DPRINTF(("ldap search '%s'", filt), 1);
for (base = ldap_conf.base; base != NULL; base = base->next) {
result = NULL;
rc = ldap_search_ext_s(ld, base->val, LDAP_SCOPE_SUBTREE, filt,
NULL, 0, NULL, NULL, NULL, 0, &result);
if (rc != LDAP_SUCCESS)
continue; /* no entries for this pass */
LDAP_FOREACH(entry, ld, result) {
if ((!do_netgr ||
sudo_ldap_check_user_netgroup(ld, entry, pw->pw_name)) &&
sudo_ldap_check_host(ld, entry) &&
sudo_ldap_check_command(ld, entry, NULL) &&
sudo_ldap_check_runas(ld, entry)) {
found = TRUE;
break;
}
}
ldap_msgfree(result);
}
efree(filt);
}
if (found)
printf("%s%s%s\n", safe_cmnd ? safe_cmnd : user_cmnd,
user_args ? " " : "", user_args ? user_args : "");
return(!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;
for (; interact->id != SASL_CB_LIST_END; interact++) {
if (interact->id != SASL_CB_USER)
return(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 */
}
return(LDAP_SUCCESS);
}
#endif /* HAVE_LDAP_SASL_INTERACTIVE_BIND_S */
/*
* Set LDAP options based on the config table.
*/
static int
sudo_ldap_set_options(LDAP *ld)
{
struct ldap_config_table *cur;
int rc;
/* 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
/* Set simple LDAP options */
for (cur = ldap_conf_table; cur->conf_str != NULL; cur++) {
LDAP *conn;
int ival;
char *sval;
if (cur->opt_val == -1)
continue;
conn = cur->connected ? ld : NULL;
switch (cur->type) {
case CONF_BOOL:
case CONF_INT:
ival = *(int *)(cur->valp);
if (ival >= 0) {
rc = ldap_set_option(conn, cur->opt_val, &ival);
if (rc != LDAP_OPT_SUCCESS) {
warningx("ldap_set_option: %s -> %d: %s",
cur->conf_str, ival, ldap_err2string(rc));
return(-1);
}
DPRINTF(("ldap_set_option: %s -> %d", cur->conf_str, ival), 1);
}
break;
case CONF_STR:
sval = *(char **)(cur->valp);
if (sval != NULL) {
rc = ldap_set_option(conn, cur->opt_val, sval);
if (rc != LDAP_OPT_SUCCESS) {
warningx("ldap_set_option: %s -> %s: %s",
cur->conf_str, sval, ldap_err2string(rc));
return(-1);
}
DPRINTF(("ldap_set_option: %s -> %s", cur->conf_str, sval), 1);
}
break;
}
}
#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;
rc = ldap_set_option(ld, LDAP_OPT_NETWORK_TIMEOUT, &tv);
if (rc != LDAP_OPT_SUCCESS) {
warningx("ldap_set_option(NETWORK_TIMEOUT, %ld): %s",
(long)tv.tv_sec, ldap_err2string(rc));
return(-1);
}
DPRINTF(("ldap_set_option(LDAP_OPT_NETWORK_TIMEOUT, %ld)\n",
(long)tv.tv_sec), 1);
}
#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;
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));
return(-1);
}
DPRINTF(("ldap_set_option(LDAP_OPT_X_TLS, LDAP_OPT_X_TLS_HARD)\n"), 1);
}
#endif
return(0);
}
/*
* 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
#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;
DPRINTF(("gss_krb5_ccache_name() failed: %d", status), 1);
}
# else
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)
DPRINTF(("gss_krb5_ccache_name() failed: %d", status), 1);
# else
if (old_ccname != NULL)
setenv("KRB5CCNAME", old_ccname, TRUE);
else
unsetenv("KRB5CCNAME");
# endif
}
if (rc != LDAP_SUCCESS) {
warningx("ldap_sasl_interactive_bind_s(): %s", ldap_err2string(rc));
return(-1);
}
DPRINTF(("ldap_sasl_interactive_bind_s() ok"), 1);
} 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));
return(-1);
}
DPRINTF(("ldap_sasl_bind_s() ok"), 1);
}
#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));
return(-1);
}
DPRINTF(("ldap_simple_bind_s() ok"), 1);
}
#endif
return(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, ldapnoinit = FALSE;
if (!sudo_ldap_read_config())
return(-1);
/* Prevent reading of user ldaprc and system defaults. */
if (getenv("LDAPNOINIT") == NULL) {
ldapnoinit = TRUE;
setenv("LDAPNOINIT", "1", TRUE);
}
/* Connect to LDAP server */
#ifdef HAVE_LDAP_INITIALIZE
if (ldap_conf.uri != NULL) {
DPRINTF(("ldap_initialize(ld, %s)", ldap_conf.uri), 2);
rc = ldap_initialize(&ld, ldap_conf.uri);
} else
#endif
rc = sudo_ldap_init(&ld, ldap_conf.host, ldap_conf.port);
if (rc != LDAP_SUCCESS) {
warningx("unable to initialize LDAP: %s", ldap_err2string(rc));
return(-1);
}
if (ldapnoinit)
unsetenv("LDAPNOINIT");
/* Set LDAP options */
if (sudo_ldap_set_options(ld) < 0)
return(-1);
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));
return(-1);
}
DPRINTF(("ldap_start_tls_s() ok"), 1);
#elif defined(HAVE_LDAP_SSL_CLIENT_INIT) && defined(HAVE_LDAP_START_TLS_S_NP)
if (ldap_ssl_client_init(NULL, NULL, 0, &rc) != LDAP_SUCCESS) {
warningx("ldap_ssl_client_init(): %s", ldap_err2string(rc));
return(-1);
}
rc = ldap_start_tls_s_np(ld, NULL);
if (rc != LDAP_SUCCESS) {
warningx("ldap_start_tls_s_np(): %s", ldap_err2string(rc));
return(-1);
}
DPRINTF(("ldap_start_tls_s_np() ok"), 1);
#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)
return(-1);
nss->handle = ld;
return(0);
}
static int
sudo_ldap_setdefs(struct sudo_nss *nss)
{
struct ldap_config_list_str *base;
LDAP *ld = (LDAP *) nss->handle;
LDAPMessage *entry, *result; /* used for searches */
int rc; /* temp return value */
if (ld == NULL)
return(-1);
for (base = ldap_conf.base; base != NULL; base = base->next) {
result = NULL;
rc = ldap_search_ext_s(ld, base->val, LDAP_SCOPE_SUBTREE,
"cn=defaults", NULL, 0, NULL, NULL, NULL, 0, &result);
if (rc == LDAP_SUCCESS && (entry = ldap_first_entry(ld, result))) {
DPRINTF(("found:%s", ldap_get_dn(ld, entry)), 1);
sudo_ldap_parse_options(ld, entry);
} else
DPRINTF(("no default options found in %s", base->val), 1);
if (result)
ldap_msgfree(result);
}
return(0);
}
/*
* like sudoers_lookup() - only LDAP style
*/
static int
sudo_ldap_lookup(struct sudo_nss *nss, int ret, int pwflag)
{
struct ldap_config_list_str *base;
LDAP *ld = (LDAP *) nss->handle;
LDAPMessage *entry, *result;
char *filt;
int do_netgr, rc, matched;
int setenv_implied;
int ldap_user_matches = FALSE, ldap_host_matches = FALSE;
struct passwd *pw = list_pw ? list_pw : sudo_user.pw;
if (ld == NULL)
return(ret);
if (pwflag) {
int doauth = UNSPEC;
enum def_tupple pwcheck =
(pwflag == -1) ? never : sudo_defs_table[pwflag].sd_un.tuple;
for (matched = 0, do_netgr = 0; !matched && do_netgr < 2; do_netgr++) {
filt = do_netgr ? estrdup("sudoUser=+*") : sudo_ldap_build_pass1(pw);
for (base = ldap_conf.base; base != NULL; base = base->next) {
result = NULL;
rc = ldap_search_ext_s(ld, base->val, LDAP_SCOPE_SUBTREE, filt,
NULL, 0, NULL, NULL, NULL, 0, &result);
if (rc != LDAP_SUCCESS)
continue;
LDAP_FOREACH(entry, ld, result) {
/* only verify netgroup matches in pass 2 */
if (do_netgr && !sudo_ldap_check_user_netgroup(ld, entry, pw->pw_name))
continue;
ldap_user_matches = TRUE;
if (sudo_ldap_check_host(ld, entry)) {
ldap_host_matches = TRUE;
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 = 1;
break; /* end foreach */
}
}
}
ldap_msgfree(result);
}
efree(filt);
}
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;
}
/*
* 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
* user netgroups. Then we take the netgroups returned and
* try to match them against the username.
*/
setenv_implied = FALSE;
for (matched = 0, do_netgr = 0; !matched && do_netgr < 2; do_netgr++) {
filt = do_netgr ? estrdup("sudoUser=+*") : sudo_ldap_build_pass1(pw);
DPRINTF(("ldap search '%s'", filt), 1);
for (base = ldap_conf.base; base != NULL; base = base->next) {
result = NULL;
rc = ldap_search_ext_s(ld, base->val, LDAP_SCOPE_SUBTREE, filt,
NULL, 0, NULL, NULL, NULL, 0, &result);
if (rc != LDAP_SUCCESS) {
DPRINTF(("nothing found for '%s'", filt), 1);
continue;
}
/* parse each entry returned from this most recent search */
LDAP_FOREACH(entry, ld, result) {
DPRINTF(("found:%s", ldap_get_dn(ld, entry)), 1);
if (
/* first verify user netgroup matches - only if in pass 2 */
(!do_netgr || sudo_ldap_check_user_netgroup(ld, entry, pw->pw_name)) &&
/* remember that user matched */
(ldap_user_matches = TRUE) &&
/* verify host match */
sudo_ldap_check_host(ld, entry) &&
/* remember that host matched */
(ldap_host_matches = TRUE) &&
/* verify runas match */
sudo_ldap_check_runas(ld, entry) &&
/* verify command match */
(rc = sudo_ldap_check_command(ld, entry, &setenv_implied)) != UNSPEC
) {
/* We have a match! */
DPRINTF(("Command %sallowed", rc == TRUE ? "" : "NOT "), 1);
matched = TRUE;
if (rc == TRUE) {
/* pick up any 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 */
/* make sure we don't reenter loop */
SET(ret, VALIDATE_OK);
CLR(ret, VALIDATE_NOT_OK);
} else {
SET(ret, VALIDATE_NOT_OK);
CLR(ret, VALIDATE_OK);
}
/* break from inside for loop */
break;
}
}
ldap_msgfree(result);
}
efree(filt);
}
done:
DPRINTF(("user_matches=%d", ldap_user_matches), 1);
DPRINTF(("host_matches=%d", ldap_host_matches), 1);
if (!ISSET(ret, VALIDATE_OK)) {
/* we do not have a match */
if (pwflag && list_pw == NULL)
SET(ret, FLAG_NO_CHECK);
}
if (ldap_user_matches)
CLR(ret, FLAG_NO_USER);
if (ldap_host_matches)
CLR(ret, FLAG_NO_HOST);
DPRINTF(("sudo_ldap_lookup(%d)=0x%02x", pwflag, ret), 1);
return(ret);
}
/*
* shut down LDAP connection
*/
static int
sudo_ldap_close(struct sudo_nss *nss)
{
if (nss->handle != NULL) {
ldap_unbind_ext_s((LDAP *) nss->handle, NULL, NULL);
nss->handle = NULL;
}
return(0);
}
/*
* STUB
*/
static int
sudo_ldap_parse(struct sudo_nss *nss)
{
return(0);
}
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