/** Check if user is authorized for remote access
*
*/
static rlm_rcode_t mod_authorize(void *instance, REQUEST *request)
{
rlm_rcode_t rcode = RLM_MODULE_OK;
ldap_rcode_t status;
int ldap_errno;
int i;
ldap_instance_t *inst = instance;
char **vals;
VALUE_PAIR *vp;
ldap_handle_t *conn;
LDAPMessage *result, *entry;
char const *dn = NULL;
rlm_ldap_map_xlat_t expanded; /* faster than mallocing every time */
if (!request->username) {
RDEBUG2("Attribute \"User-Name\" is required for authorization");
return RLM_MODULE_NOOP;
}
/*
* Check for valid input, zero length names not permitted
*/
if (request->username->length == 0) {
RDEBUG2("Zero length username not permitted");
return RLM_MODULE_INVALID;
}
if (rlm_ldap_map_xlat(request, inst->user_map, &expanded) < 0) {
return RLM_MODULE_FAIL;
}
conn = rlm_ldap_get_socket(inst, request);
if (!conn) return RLM_MODULE_FAIL;
/*
* Add any additional attributes we need for checking access, memberships, and profiles
*/
if (inst->userobj_access_attr) {
expanded.attrs[expanded.count++] = inst->userobj_access_attr;
}
if (inst->userobj_membership_attr && (inst->cacheable_group_dn || inst->cacheable_group_name)) {
expanded.attrs[expanded.count++] = inst->userobj_membership_attr;
}
if (inst->profile_attr) {
expanded.attrs[expanded.count++] = inst->profile_attr;
}
if (inst->valuepair_attr) {
expanded.attrs[expanded.count++] = inst->valuepair_attr;
}
expanded.attrs[expanded.count] = NULL;
dn = rlm_ldap_find_user(inst, request, &conn, expanded.attrs, true, &result, &rcode);
if (!dn) {
goto finish;
}
entry = ldap_first_entry(conn->handle, result);
if (!entry) {
ldap_get_option(conn->handle, LDAP_OPT_RESULT_CODE, &ldap_errno);
REDEBUG("Failed retrieving entry: %s", ldap_err2string(ldap_errno));
goto finish;
}
/*
* Check for access.
*/
if (inst->userobj_access_attr) {
rcode = rlm_ldap_check_access(inst, request, conn, entry);
if (rcode != RLM_MODULE_OK) {
goto finish;
}
}
/*
* Check if we need to cache group memberships
*/
if (inst->cacheable_group_dn || inst->cacheable_group_name) {
if (inst->userobj_membership_attr) {
rcode = rlm_ldap_cacheable_userobj(inst, request, &conn, entry, inst->userobj_membership_attr);
if (rcode != RLM_MODULE_OK) {
goto finish;
}
}
rcode = rlm_ldap_cacheable_groupobj(inst, request, &conn);
if (rcode != RLM_MODULE_OK) {
goto finish;
}
}
#ifdef WITH_EDIR
/*
* We already have a Cleartext-Password. Skip edir.
*/
if (pairfind(request->config_items, PW_CLEARTEXT_PASSWORD, 0, TAG_ANY)) {
goto skip_edir;
}
/*
* Retrieve Universal Password if we use eDirectory
*/
if (inst->edir) {
int res = 0;
char password[256];
size_t pass_size = sizeof(password);
/*
* Retrive universal password
*/
res = nmasldap_get_password(conn->handle, dn, password, &pass_size);
if (res != 0) {
REDEBUG("Failed to retrieve eDirectory password: (%i) %s", res, edir_errstr(res));
rcode = RLM_MODULE_FAIL;
goto finish;
}
/*
* Add Cleartext-Password attribute to the request
*/
vp = radius_paircreate(request, &request->config_items, PW_CLEARTEXT_PASSWORD, 0);
pairstrcpy(vp, password);
vp->length = pass_size;
RDEBUG2("Added eDirectory password in check items as %s = %s", vp->da->name, vp->vp_strvalue);
if (inst->edir_autz) {
RDEBUG2("Binding as user for eDirectory authorization checks");
/*
* Bind as the user
*/
conn->rebound = true;
status = rlm_ldap_bind(inst, request, &conn, dn, vp->vp_strvalue, true);
switch (status) {
case LDAP_PROC_SUCCESS:
rcode = RLM_MODULE_OK;
RDEBUG("Bind as user \"%s\" was successful", dn);
break;
case LDAP_PROC_NOT_PERMITTED:
rcode = RLM_MODULE_USERLOCK;
goto finish;
case LDAP_PROC_REJECT:
rcode = RLM_MODULE_REJECT;
goto finish;
case LDAP_PROC_BAD_DN:
rcode = RLM_MODULE_INVALID;
goto finish;
case LDAP_PROC_NO_RESULT:
rcode = RLM_MODULE_NOTFOUND;
goto finish;
default:
rcode = RLM_MODULE_FAIL;
goto finish;
};
}
}
skip_edir:
#endif
/*
* Apply ONE user profile, or a default user profile.
*/
if (inst->default_profile) {
char profile[1024];
if (radius_xlat(profile, sizeof(profile), request, inst->default_profile, NULL, NULL) < 0) {
REDEBUG("Failed creating default profile string");
rcode = RLM_MODULE_INVALID;
goto finish;
}
rlm_ldap_map_profile(inst, request, &conn, profile, &expanded);
}
/*
* Apply a SET of user profiles.
*/
if (inst->profile_attr) {
vals = ldap_get_values(conn->handle, entry, inst->profile_attr);
if (vals != NULL) {
for (i = 0; vals[i] != NULL; i++) {
rlm_ldap_map_profile(inst, request, &conn, vals[i], &expanded);
}
ldap_value_free(vals);
}
}
if (inst->user_map || inst->valuepair_attr) {
RDEBUG("Processing user attributes");
rlm_ldap_map_do(inst, request, conn->handle, &expanded, entry);
rlm_ldap_check_reply(inst, request);
}
finish:
rlm_ldap_map_xlat_free(&expanded);
if (result) {
ldap_msgfree(result);
}
rlm_ldap_release_socket(inst, conn);
return rcode;
}
/** Check the user's password against ldap directory
*
* @param instance rlm_ldap configuration.
* @param request Current request.
* @return one of the RLM_MODULE_* values.
*/
static rlm_rcode_t mod_authenticate(void *instance, REQUEST *request)
{
rlm_rcode_t rcode;
ldap_rcode_t status;
char const *dn;
ldap_instance_t *inst = instance;
ldap_handle_t *conn;
/*
* Ensure that we're being passed a plain-text password, and not
* anything else.
*/
if (!request->username) {
REDEBUG("Attribute \"User-Name\" is required for authentication");
return RLM_MODULE_INVALID;
}
if (!request->password ||
(request->password->da->attr != PW_USER_PASSWORD)) {
RWDEBUG("You have set \"Auth-Type := LDAP\" somewhere");
RWDEBUG("*********************************************");
RWDEBUG("* THAT CONFIGURATION IS WRONG. DELETE IT. ");
RWDEBUG("* YOU ARE PREVENTING THE SERVER FROM WORKING");
RWDEBUG("*********************************************");
REDEBUG("Attribute \"User-Password\" is required for authentication");
return RLM_MODULE_INVALID;
}
if (request->password->length == 0) {
REDEBUG("Empty password supplied");
return RLM_MODULE_INVALID;
}
RDEBUG("Login attempt by \"%s\"", request->username->vp_strvalue);
conn = rlm_ldap_get_socket(inst, request);
if (!conn) return RLM_MODULE_FAIL;
/*
* Get the DN by doing a search.
*/
dn = rlm_ldap_find_user(inst, request, &conn, NULL, false, NULL, &rcode);
if (!dn) {
rlm_ldap_release_socket(inst, conn);
return rcode;
}
/*
* Bind as the user
*/
conn->rebound = true;
status = rlm_ldap_bind(inst, request, &conn, dn, request->password->vp_strvalue, true);
switch (status) {
case LDAP_PROC_SUCCESS:
rcode = RLM_MODULE_OK;
RDEBUG("Bind as user \"%s\" was successful", dn);
break;
case LDAP_PROC_NOT_PERMITTED:
rcode = RLM_MODULE_USERLOCK;
break;
case LDAP_PROC_REJECT:
rcode = RLM_MODULE_REJECT;
break;
case LDAP_PROC_BAD_DN:
rcode = RLM_MODULE_INVALID;
break;
case LDAP_PROC_NO_RESULT:
rcode = RLM_MODULE_NOTFOUND;
break;
default:
rcode = RLM_MODULE_FAIL;
break;
};
rlm_ldap_release_socket(inst, conn);
return rcode;
}
/** Perform LDAP-Group comparison checking
*
* Attempts to match users to groups using a variety of methods.
*
* @param instance of the rlm_ldap module.
* @param request Current request.
* @param thing Unknown.
* @param check Which group to check for user membership.
* @param check_pairs Unknown.
* @param reply_pairs Unknown.
* @return 1 on failure (or if the user is not a member), else 0.
*/
static int rlm_ldap_groupcmp(void *instance, REQUEST *request, UNUSED VALUE_PAIR *thing, VALUE_PAIR *check,
UNUSED VALUE_PAIR *check_pairs, UNUSED VALUE_PAIR **reply_pairs)
{
ldap_instance_t *inst = instance;
rlm_rcode_t rcode;
int found = false;
int check_is_dn;
ldap_handle_t *conn = NULL;
char const *user_dn;
rad_assert(inst->groupobj_base_dn);
RDEBUG("Searching for user in group \"%s\"", check->vp_strvalue);
if (check->length == 0) {
RDEBUG("Cannot do comparison (group name is empty)");
return 1;
}
/*
* Check if we can do cached membership verification
*/
check_is_dn = rlm_ldap_is_dn(check->vp_strvalue);
if ((check_is_dn && inst->cacheable_group_dn) || (!check_is_dn && inst->cacheable_group_name)) {
switch(rlm_ldap_check_cached(inst, request, check)) {
case RLM_MODULE_NOTFOUND:
found = false;
goto finish;
case RLM_MODULE_OK:
found = true;
goto finish;
/*
* Fallback to dynamic search on failure
*/
case RLM_MODULE_FAIL:
case RLM_MODULE_INVALID:
default:
break;
}
}
conn = rlm_ldap_get_socket(inst, request);
if (!conn) return 1;
/*
* This is used in the default membership filter.
*/
user_dn = rlm_ldap_find_user(inst, request, &conn, NULL, false, NULL, &rcode);
if (!user_dn) {
rlm_ldap_release_socket(inst, conn);
return 1;
}
rad_assert(conn);
/*
* Check groupobj user membership
*/
if (inst->groupobj_membership_filter) {
switch(rlm_ldap_check_groupobj_dynamic(inst, request, &conn, check)) {
case RLM_MODULE_NOTFOUND:
break;
case RLM_MODULE_OK:
found = true;
default:
goto finish;
}
}
rad_assert(conn);
/*
* Check userobj group membership
*/
if (inst->userobj_membership_attr) {
switch(rlm_ldap_check_userobj_dynamic(inst, request, &conn, user_dn, check)) {
case RLM_MODULE_NOTFOUND:
break;
case RLM_MODULE_OK:
found = true;
default:
goto finish;
}
}
rad_assert(conn);
finish:
if (conn) {
rlm_ldap_release_socket(inst, conn);
}
if (!found) {
RDEBUG("User is not a member of specified group");
return 1;
}
return 0;
}
/** Expand an LDAP URL into a query, and return a string result from that query.
*
*/
static ssize_t ldap_xlat(void *instance, REQUEST *request, char const *fmt, char *out, size_t freespace)
{
ldap_rcode_t status;
size_t len = 0;
ldap_instance_t *inst = instance;
LDAPURLDesc *ldap_url;
LDAPMessage *result = NULL;
LDAPMessage *entry = NULL;
char **vals;
ldap_handle_t *conn;
int ldap_errno;
char const *url;
char const **attrs;
url = fmt;
if (!ldap_is_ldap_url(url)) {
REDEBUG("String passed does not look like an LDAP URL");
return -1;
}
if (ldap_url_parse(url, &ldap_url)){
REDEBUG("Parsing LDAP URL failed");
return -1;
}
/*
* Nothing, empty string, "*" string, or got 2 things, die.
*/
if (!ldap_url->lud_attrs || !ldap_url->lud_attrs[0] ||
!*ldap_url->lud_attrs[0] ||
(strcmp(ldap_url->lud_attrs[0], "*") == 0) ||
ldap_url->lud_attrs[1]) {
REDEBUG("Bad attributes list in LDAP URL. URL must specify exactly one attribute to retrieve");
goto free_urldesc;
}
if (ldap_url->lud_host &&
((strncmp(inst->server, ldap_url->lud_host, strlen(inst->server)) != 0) ||
(ldap_url->lud_port != inst->port))) {
RDEBUG("Requested server/port is \"%s:%i\"", ldap_url->lud_host, inst->port);
goto free_urldesc;
}
conn = rlm_ldap_get_socket(inst, request);
if (!conn) goto free_urldesc;
memcpy(&attrs, &ldap_url->lud_attrs, sizeof(attrs));
status = rlm_ldap_search(inst, request, &conn, ldap_url->lud_dn, ldap_url->lud_scope, ldap_url->lud_filter,
attrs, &result);
switch (status) {
case LDAP_PROC_SUCCESS:
break;
case LDAP_PROC_NO_RESULT:
RDEBUG("Search returned not found");
default:
goto free_socket;
}
rad_assert(conn);
rad_assert(result);
entry = ldap_first_entry(conn->handle, result);
if (!entry) {
ldap_get_option(conn->handle, LDAP_OPT_RESULT_CODE, &ldap_errno);
REDEBUG("Failed retrieving entry: %s", ldap_err2string(ldap_errno));
len = -1;
goto free_result;
}
vals = ldap_get_values(conn->handle, entry, ldap_url->lud_attrs[0]);
if (!vals) {
RDEBUG("No \"%s\" attributes found in specified object", ldap_url->lud_attrs[0]);
goto free_result;
}
len = strlen(vals[0]);
if (len >= freespace){
goto free_vals;
}
strlcpy(out, vals[0], freespace);
free_vals:
ldap_value_free(vals);
free_result:
ldap_msgfree(result);
free_socket:
rlm_ldap_release_socket(inst, conn);
free_urldesc:
ldap_free_urldesc(ldap_url);
return len;
}
/** Modify user's object in LDAP
*
* Process a modifcation map to update a user object in the LDAP directory.
*
* @param inst rlm_ldap instance.
* @param request Current request.
* @param section that holds the map to process.
* @return one of the RLM_MODULE_* values.
*/
static rlm_rcode_t user_modify(ldap_instance_t *inst, REQUEST *request, ldap_acct_section_t *section)
{
rlm_rcode_t rcode = RLM_MODULE_OK;
ldap_handle_t *conn = NULL;
LDAPMod *mod_p[LDAP_MAX_ATTRMAP + 1], mod_s[LDAP_MAX_ATTRMAP];
LDAPMod **modify = mod_p;
char *passed[LDAP_MAX_ATTRMAP * 2];
int i, total = 0, last_pass = 0;
char *expanded[LDAP_MAX_ATTRMAP];
int last_exp = 0;
char const *attr;
char const *value;
char const *dn;
/*
* Build our set of modifications using the update sections in
* the config.
*/
CONF_ITEM *ci;
CONF_PAIR *cp;
CONF_SECTION *cs;
FR_TOKEN op;
char path[MAX_STRING_LEN];
char *p = path;
rad_assert(section);
/*
* Locate the update section were going to be using
*/
if (section->reference[0] != '.') {
*p++ = '.';
}
if (radius_xlat(p, (sizeof(path) - (p - path)) - 1, request, section->reference, NULL, NULL) < 0) {
goto error;
}
ci = cf_reference_item(NULL, section->cs, path);
if (!ci) {
goto error;
}
if (!cf_item_is_section(ci)){
REDEBUG("Reference must resolve to a section");
goto error;
}
cs = cf_section_sub_find(cf_itemtosection(ci), "update");
if (!cs) {
REDEBUG("Section must contain 'update' subsection");
goto error;
}
/*
* Iterate over all the pairs, building our mods array
*/
for (ci = cf_item_find_next(cs, NULL); ci != NULL; ci = cf_item_find_next(cs, ci)) {
int do_xlat = false;
if (total == LDAP_MAX_ATTRMAP) {
REDEBUG("Modify map size exceeded");
goto error;
}
if (!cf_item_is_pair(ci)) {
REDEBUG("Entry is not in \"ldap-attribute = value\" format");
goto error;
}
/*
* Retrieve all the information we need about the pair
*/
cp = cf_itemtopair(ci);
value = cf_pair_value(cp);
attr = cf_pair_attr(cp);
op = cf_pair_operator(cp);
if (!value || (*value == '\0')) {
RDEBUG("Empty value string, skipping attribute \"%s\"", attr);
continue;
}
switch (cf_pair_value_type(cp))
{
case T_BARE_WORD:
case T_SINGLE_QUOTED_STRING:
break;
case T_BACK_QUOTED_STRING:
case T_DOUBLE_QUOTED_STRING:
do_xlat = true;
break;
default:
rad_assert(0);
goto error;
}
if (op == T_OP_CMP_FALSE) {
passed[last_pass] = NULL;
} else if (do_xlat) {
char *exp = NULL;
if (radius_xlat(exp, 0, request, value, NULL, NULL) <= 0) {
RDEBUG("Skipping attribute \"%s\"", attr);
talloc_free(exp);
continue;
}
expanded[last_exp++] = exp;
passed[last_pass] = exp;
/*
* Static strings
*/
} else {
memcpy(&(passed[last_pass]), &value, sizeof(passed[last_pass]));
}
passed[last_pass + 1] = NULL;
mod_s[total].mod_values = &(passed[last_pass]);
last_pass += 2;
switch (op)
{
/*
* T_OP_EQ is *NOT* supported, it is impossible to
* support because of the lack of transactions in LDAP
*/
case T_OP_ADD:
mod_s[total].mod_op = LDAP_MOD_ADD;
break;
case T_OP_SET:
mod_s[total].mod_op = LDAP_MOD_REPLACE;
break;
case T_OP_SUB:
case T_OP_CMP_FALSE:
mod_s[total].mod_op = LDAP_MOD_DELETE;
break;
#ifdef LDAP_MOD_INCREMENT
case T_OP_INCRM:
mod_s[total].mod_op = LDAP_MOD_INCREMENT;
break;
#endif
default:
REDEBUG("Operator '%s' is not supported for LDAP modify operations",
fr_int2str(fr_tokens, op, "<INVALID>"));
goto error;
}
/*
* Now we know the value is ok, copy the pointers into
* the ldapmod struct.
*/
memcpy(&(mod_s[total].mod_type), &(attr), sizeof(mod_s[total].mod_type));
mod_p[total] = &(mod_s[total]);
total++;
}
if (total == 0) {
rcode = RLM_MODULE_NOOP;
goto release;
}
mod_p[total] = NULL;
conn = rlm_ldap_get_socket(inst, request);
if (!conn) return RLM_MODULE_FAIL;
dn = rlm_ldap_find_user(inst, request, &conn, NULL, false, NULL, &rcode);
if (!dn || (rcode != RLM_MODULE_OK)) {
goto error;
}
rcode = rlm_ldap_modify(inst, request, &conn, dn, modify);
release:
error:
/*
* Free up any buffers we allocated for xlat expansion
*/
for (i = 0; i < last_exp; i++) {
talloc_free(expanded[i]);
}
rlm_ldap_release_socket(inst, conn);
return rcode;
}
/** Load clients from LDAP on server start
*
* @param[in] inst rlm_ldap configuration.
* @param[in] cs to load client attribute/LDAP attribute mappings from.
* @return -1 on error else 0.
*/
int rlm_ldap_client_load(ldap_instance_t const *inst, CONF_SECTION *cs)
{
int ret = 0;
ldap_rcode_t status;
ldap_handle_t *conn = NULL;
char const **attrs = NULL;
CONF_PAIR *cp;
int count = 0, idx = 0;
LDAPMessage *result = NULL;
LDAPMessage *entry;
char *dn = NULL;
RADCLIENT *c;
LDAP_DBG("Loading dynamic clients");
rad_assert(inst->clientobj_base_dn);
if (!inst->clientobj_filter) {
LDAP_ERR("Told to load clients but 'client.filter' not specified");
return -1;
}
count = cf_pair_count(cs);
count++;
/*
* Create an array of LDAP attributes to feed to rlm_ldap_search.
*/
attrs = talloc_array(inst, char const *, count);
if (rlm_ldap_client_get_attrs(attrs, &idx, cs) < 0) return -1;
conn = rlm_ldap_get_socket(inst, NULL);
if (!conn) return -1;
/*
* Perform all searches as the admin user.
*/
if (conn->rebound) {
status = rlm_ldap_bind(inst, NULL, &conn, inst->admin_dn, inst->password, true);
if (status != LDAP_PROC_SUCCESS) {
ret = -1;
goto finish;
}
rad_assert(conn);
conn->rebound = false;
}
status = rlm_ldap_search(inst, NULL, &conn, inst->clientobj_base_dn, inst->clientobj_scope,
inst->clientobj_filter, attrs, &result);
switch (status) {
case LDAP_PROC_SUCCESS:
break;
case LDAP_PROC_NO_RESULT:
LDAP_INFO("No clients were found in the directory");
ret = 0;
goto finish;
default:
ret = -1;
goto finish;
}
rad_assert(conn);
entry = ldap_first_entry(conn->handle, result);
if (!entry) {
int ldap_errno;
ldap_get_option(conn->handle, LDAP_OPT_RESULT_CODE, &ldap_errno);
LDAP_ERR("Failed retrieving entry: %s", ldap_err2string(ldap_errno));
ret = -1;
goto finish;
}
do {
CONF_SECTION *cc;
char *id;
char **value;
id = dn = ldap_get_dn(conn->handle, entry);
cp = cf_pair_find(cs, "identifier");
if (cp) {
value = ldap_get_values(conn->handle, entry, cf_pair_value(cp));
if (value) id = value[0];
}
/*
* Iterate over mapping sections
*/
cc = cf_section_alloc(NULL, "client", id);
if (rlm_ldap_client_map_section(inst, cc, cs, conn, entry) < 0) {
talloc_free(cc);
ret = -1;
goto finish;
}
/*
*@todo these should be parented from something
*/
c = client_afrom_cs(NULL, cc, false);
if (!c) {
talloc_free(cc);
ret = -1;
goto finish;
}
/*
* Client parents the CONF_SECTION which defined it
*/
talloc_steal(c, cc);
if (!client_add(NULL, c)) {
LDAP_ERR("Failed to add client \"%s\", possible duplicate?", dn);
ret = -1;
client_free(c);
goto finish;
}
LDAP_DBG("Client \"%s\" added", dn);
ldap_memfree(dn);
dn = NULL;
} while ((entry = ldap_next_entry(conn->handle, entry)));
finish:
talloc_free(attrs);
if (dn) ldap_memfree(dn);
if (result) ldap_msgfree(result);
rlm_ldap_release_socket(inst, conn);
return ret;
}
