SUDO integration - LDAP provider

1 files changed, 566 insertions, 0 deletions

diff --git a/src/providers/ldap/sdap_sudo.c b/src/providers/ldap/sdap_sudo.c
new file mode 100644
index 000000000..9bf77dde5
--- /dev/null
+++ b/src/providers/ldap/sdap_sudo.c
@@ -0,0 +1,566 @@
+/*
+    Authors:
+        Pavel Březina <pbrezina@redhat.com>
+
+    Copyright (C) 2011 Red Hat
+
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include <errno.h>
+#include <string.h>
+#include <tevent.h>
+
+#include "providers/dp_backend.h"
+#include "providers/ldap/ldap_common.h"
+#include "providers/ldap/sdap.h"
+#include "providers/ldap/sdap_async.h"
+#include "providers/ldap/sdap_sudo.h"
+#include "providers/ldap/sdap_sudo_cache.h"
+#include "db/sysdb_sudo.h"
+
+struct sdap_sudo_load_sudoers_state {
+    struct tevent_context *ev;
+    struct sdap_sudo_ctx *sudo_ctx;
+    struct sdap_options *opts;
+    struct sdap_handle *sh;
+    struct sysdb_attrs **ldap_rules; /* search result will be stored here */
+    size_t ldap_rules_count; /* search result will be stored here */
+
+    const char **attrs;
+    const char *filter;
+    size_t base_iter;
+    struct sdap_search_base **search_bases;
+    int timeout;
+};
+
+static int sdap_sudo_connect(struct sdap_sudo_ctx *sudo_ctx);
+static void sdap_sudo_connect_done(struct tevent_req *req);
+
+static struct tevent_req * sdap_sudo_load_sudoers_send(TALLOC_CTX *mem_ctx,
+                                                       struct sdap_sudo_ctx *sudo_ctx);
+static errno_t sdap_sudo_load_sudoers_next_base(struct tevent_req *req);
+static void sdap_sudo_load_sudoers_process(struct tevent_req *subreq);
+static int sdap_sudo_load_sudoers_recv(struct tevent_req *req,
+                                       TALLOC_CTX *mem_ctx,
+                                       size_t *rules_count,
+                                       struct sysdb_attrs ***rules);
+static void sdap_sudo_load_sudoers_done(struct tevent_req *req);
+
+static int sdap_sudo_purge_sudoers(struct sdap_sudo_ctx *sudo_ctx);
+static int sdap_sudo_store_sudoers(struct sdap_sudo_ctx *sudo_ctx,
+                                   size_t replies_count,
+                                   struct sysdb_attrs **replies);
+
+const char *sdap_sudo_build_filter(TALLOC_CTX *mem_ctx,
+                                   struct sdap_attr_map *map,
+                                   const char *username,
+                                   uid_t uid,
+                                   char **groups);
+
+static void sdap_sudo_reply(struct sdap_sudo_ctx *sudo_ctx, int errcode)
+{
+    struct be_req *be_req = sudo_ctx->be_req;
+
+    talloc_zfree(sudo_ctx);
+
+    if (errcode == EOK) {
+        sdap_handler_done(be_req, DP_ERR_OK, errcode, strerror(errcode));
+    } else {
+        sdap_handler_done(be_req, DP_ERR_FATAL, errcode, strerror(errcode));
+    }
+}
+
+static void sdap_sudo_reply_offline(struct sdap_sudo_ctx *sudo_ctx)
+{
+    struct  be_req *be_req = sudo_ctx->be_req;
+
+    talloc_zfree(sudo_ctx);
+
+    sdap_handler_done(be_req, DP_ERR_OFFLINE, EAGAIN, "Provider is offline");
+}
+
+void sdap_sudo_handler(struct be_req *be_req)
+{
+    struct sdap_sudo_ctx *sudo_ctx = NULL;
+    struct be_sudo_req *sudo_req = NULL;
+    struct sdap_id_ctx *id_ctx = NULL;
+    int ret = EOK;
+
+    id_ctx = talloc_get_type(be_req->be_ctx->bet_info[BET_SUDO].pvt_bet_data,
+                             struct sdap_id_ctx);
+
+    sudo_req = talloc_get_type(be_req->req_data, struct be_sudo_req);
+
+    sudo_ctx = talloc_zero(be_req, struct sdap_sudo_ctx);
+    if (!sudo_ctx) {
+        ret = ENOMEM;
+        goto fail;
+    }
+
+    sudo_ctx->be_ctx = id_ctx->be;
+    sudo_ctx->be_req = be_req;
+    sudo_ctx->req = sudo_req;
+    sudo_ctx->sdap_ctx = id_ctx;
+    sudo_ctx->sdap_op = NULL;
+    sudo_ctx->sdap_conn_cache = id_ctx->conn_cache;
+
+    /* get user info */
+    sudo_ctx->username = sudo_req->username;
+    if (sudo_ctx->username != NULL) {
+        ret = sysdb_get_sudo_user_info(sudo_ctx, sudo_ctx->username,
+                                       sudo_ctx->be_ctx->sysdb,
+                                       &sudo_ctx->uid, &sudo_ctx->groups);
+        if (ret != EOK) {
+            DEBUG(SSSDBG_CRIT_FAILURE, ("Unable to get uid and groups of %s\n",
+                  sudo_ctx->username));
+            goto fail;
+        }
+    } else {
+        sudo_ctx->uid = 0;
+        sudo_ctx->groups = NULL;
+    }
+
+    DEBUG(SSSDBG_FUNC_DATA, ("Requested refresh for: %s\n",
+          sudo_req->username ? sudo_req->username : "<ALL>\n"));
+
+    ret = sdap_sudo_connect(sudo_ctx);
+    if (ret != EOK) {
+        goto fail;
+    }
+
+    return;
+
+fail:
+    be_req->fn(be_req, DP_ERR_FATAL, ret, NULL);
+}
+
+int sdap_sudo_connect(struct sdap_sudo_ctx *sudo_ctx)
+{
+    struct tevent_req *req = NULL;
+    int ret;
+
+    if (be_is_offline(sudo_ctx->be_ctx)) {
+        sdap_sudo_reply_offline(sudo_ctx);
+        return EOK;
+    }
+
+    if (sudo_ctx->sdap_op == NULL) {
+        sudo_ctx->sdap_op = sdap_id_op_create(sudo_ctx,
+                                              sudo_ctx->sdap_conn_cache);
+        if (sudo_ctx->sdap_op == NULL) {
+            DEBUG(SSSDBG_CRIT_FAILURE, ("sdap_id_op_create() failed\n"));
+            return EIO;
+        }
+    }
+
+    req = sdap_id_op_connect_send(sudo_ctx->sdap_op, sudo_ctx, &ret);
+    if (req == NULL) {
+        DEBUG(SSSDBG_CRIT_FAILURE,
+              ("sdap_id_op_connect_send() failed: %d(%s)\n", ret, strerror(ret)));
+        talloc_zfree(sudo_ctx->sdap_op);
+        return ret;
+    }
+
+    tevent_req_set_callback(req, sdap_sudo_connect_done, sudo_ctx);
+
+    return EOK;
+}
+
+void sdap_sudo_connect_done(struct tevent_req *req)
+{
+    struct sdap_sudo_ctx *sudo_ctx = NULL;
+    int dp_error;
+    int ret;
+
+    sudo_ctx = tevent_req_callback_data(req, struct sdap_sudo_ctx);
+
+    ret = sdap_id_op_connect_recv(req, &dp_error);
+    talloc_zfree(req);
+
+    if (dp_error == DP_ERR_OFFLINE) {
+        talloc_zfree(sudo_ctx->sdap_op);
+        sdap_sudo_reply_offline(sudo_ctx);
+        return;
+    } else if (ret != EOK) {
+        DEBUG(SSSDBG_CRIT_FAILURE,
+              ("SUDO LDAP connection failed - %s\n", strerror(ret)));
+        goto fail;
+    }
+
+    DEBUG(SSSDBG_TRACE_FUNC, ("SUDO LDAP connection successful\n"));
+
+    req = sdap_sudo_load_sudoers_send(sudo_ctx, sudo_ctx);
+    if (req == NULL) {
+        ret = EFAULT;
+        goto fail;
+    }
+
+    tevent_req_set_callback(req, sdap_sudo_load_sudoers_done, sudo_ctx);
+
+    return;
+
+fail:
+    sdap_sudo_reply(sudo_ctx, ret);
+}
+
+struct tevent_req * sdap_sudo_load_sudoers_send(TALLOC_CTX *mem_ctx,
+                                                struct sdap_sudo_ctx *sudo_ctx)
+{
+    struct tevent_req *req = NULL;
+    struct sdap_sudo_load_sudoers_state *state = NULL;
+    int ret;
+
+    req = tevent_req_create(mem_ctx, &state, struct sdap_sudo_load_sudoers_state);
+    if (!req) {
+        return NULL;
+    }
+
+    state->ev = sudo_ctx->be_ctx->ev;
+    state->sudo_ctx = sudo_ctx;
+    state->opts = sudo_ctx->sdap_ctx->opts;
+    state->sh = sdap_id_op_handle(sudo_ctx->sdap_op);
+    state->base_iter = 0;
+    state->search_bases = state->opts->sudo_search_bases;
+    state->timeout = dp_opt_get_int(state->opts->basic, SDAP_SEARCH_TIMEOUT);
+    state->ldap_rules = NULL;
+    state->ldap_rules_count = 0;
+
+    /* create filter */
+    state->filter = sdap_sudo_build_filter(state,
+                                           state->opts->sudorule_map,
+                                           sudo_ctx->username,
+                                           sudo_ctx->uid,
+                                           sudo_ctx->groups);
+    if (state->filter == NULL) {
+        goto fail;
+    }
+
+    /* create attrs from map */
+    ret = build_attrs_from_map(state, state->opts->sudorule_map,
+                               SDAP_OPTS_SUDO, &state->attrs);
+    if (ret != EOK) {
+        goto fail;
+    }
+
+    /* begin search */
+    ret = sdap_sudo_load_sudoers_next_base(req);
+    if (ret != EOK) {
+        tevent_req_error(req, ret);
+        tevent_req_post(req, sudo_ctx->be_ctx->ev);
+    }
+
+    return req;
+
+fail:
+    talloc_zfree(req);
+    return NULL;
+}
+
+static errno_t sdap_sudo_load_sudoers_next_base(struct tevent_req *req)
+{
+    struct tevent_req *subreq = NULL;
+    struct sdap_sudo_load_sudoers_state *state = NULL;
+    struct sdap_search_base *search_base = NULL;
+    char *filter = NULL;
+
+    state = tevent_req_data(req, struct sdap_sudo_load_sudoers_state);
+    search_base = state->search_bases[state->base_iter];
+    if (search_base == NULL) {
+        /* should not happen */
+        DEBUG(SSSDBG_CRIT_FAILURE, ("search_base is null\n"));
+        return EFAULT;
+    }
+
+    /* create filter */
+    filter = sdap_get_id_specific_filter(state, state->filter,
+                                         search_base->filter);
+    if (filter == NULL) {
+        return ENOMEM;
+    }
+
+    /* send request */
+    DEBUG(SSSDBG_TRACE_FUNC,
+          ("Searching for sudo rules with base [%s]\n",
+           search_base->basedn));
+
+    subreq = sdap_get_generic_send(state,
+                                   state->ev,
+                                   state->opts,
+                                   state->sh,
+                                   search_base->basedn,
+                                   search_base->scope,
+                                   filter,
+                                   state->attrs,
+                                   state->opts->sudorule_map,
+                                   SDAP_OPTS_SUDO,
+                                   state->timeout);
+    if (subreq == NULL) {
+        return ENOMEM;
+    }
+
+    tevent_req_set_callback(subreq, sdap_sudo_load_sudoers_process, req);
+
+    return EOK;
+}
+
+static void sdap_sudo_load_sudoers_process(struct tevent_req *subreq)
+{
+    struct tevent_req *req = NULL;
+    struct sdap_sudo_load_sudoers_state *state = NULL;
+    struct sdap_search_base *search_base = NULL;
+    struct sysdb_attrs **attrs = NULL;
+    size_t count;
+    int ret;
+    int i;
+
+    req = tevent_req_callback_data(subreq, struct tevent_req);
+    state = tevent_req_data(req, struct sdap_sudo_load_sudoers_state);
+    search_base = state->search_bases[state->base_iter];
+
+    DEBUG(SSSDBG_TRACE_FUNC,
+          ("Receiving sudo rules with base [%s]\n",
+           search_base->basedn));
+
+    ret = sdap_get_generic_recv(subreq, state, &count, &attrs);
+    talloc_zfree(subreq);
+    if (ret) {
+        tevent_req_error(req, ret);
+        return;
+    }
+
+    /* add rules to result */
+    if (count > 0) {
+        state->ldap_rules = talloc_realloc(state, state->ldap_rules,
+                                           struct sysdb_attrs *,
+                                           state->ldap_rules_count + count);
+        if (state->ldap_rules == NULL) {
+            tevent_req_error(req, ENOMEM);
+            return;
+        }
+
+        for (i = 0; i < count; i++) {
+            state->ldap_rules[state->ldap_rules_count + i] = talloc_steal(
+                                                   state->ldap_rules, attrs[i]);
+        }
+
+        state->ldap_rules_count += count;
+    }
+
+    /* go to next base */
+    state->base_iter++;
+    if (state->search_bases[state->base_iter]) {
+        ret = sdap_sudo_load_sudoers_next_base(req);
+        if (ret != EOK) {
+            tevent_req_error(req, ret);
+        }
+
+        return;
+    }
+
+    /* we are done */
+    tevent_req_done(req);
+}
+
+int sdap_sudo_load_sudoers_recv(struct tevent_req *req,
+                                TALLOC_CTX *mem_ctx,
+                                size_t *rules_count,
+                                struct sysdb_attrs ***rules)
+{
+    struct sdap_sudo_load_sudoers_state *state = NULL;
+
+    state = tevent_req_data(req, struct sdap_sudo_load_sudoers_state);
+
+    TEVENT_REQ_RETURN_ON_ERROR(req);
+
+    *rules_count = state->ldap_rules_count;
+    *rules = talloc_steal(mem_ctx, state->ldap_rules);
+
+    return EOK;
+}
+
+void sdap_sudo_load_sudoers_done(struct tevent_req *req)
+{
+    struct sdap_sudo_ctx *sudo_ctx = NULL;
+    struct sysdb_attrs **rules = NULL;
+    size_t rules_count;
+    int ret;
+
+    sudo_ctx = tevent_req_callback_data(req, struct sdap_sudo_ctx);
+
+    ret = sdap_sudo_load_sudoers_recv(req, sudo_ctx, &rules_count, &rules);
+    talloc_zfree(req);
+    if (ret != EOK) {
+        goto done;
+    }
+
+    DEBUG(SSSDBG_TRACE_FUNC, ("Received %d rules\n", rules_count));
+
+    /* purge cache */
+    /* TODO purge with filter */
+    DEBUG(SSSDBG_TRACE_FUNC, ("Purging sudo cache with filter %s\n", ""));
+    ret = sdap_sudo_purge_sudoers(sudo_ctx);
+    if (ret != EOK) {
+        goto done;
+    }
+
+    /* store rules */
+    ret = sdap_sudo_store_sudoers(sudo_ctx, rules_count, rules);
+    if (ret != EOK) {
+        goto done;
+    }
+
+    DEBUG(SSSDBG_TRACE_FUNC, ("Sudoers is successfuly stored in cache\n"));
+
+    ret = EOK;
+
+done:
+    sdap_sudo_reply(sudo_ctx, ret);
+}
+
+int sdap_sudo_purge_sudoers(struct sdap_sudo_ctx *sudo_ctx)
+{
+    struct sysdb_ctx *sysdb_ctx = sudo_ctx->be_ctx->sysdb;
+    char *filter = NULL;
+    int ret;
+
+    if (sudo_ctx->username != NULL) {
+        ret = sysdb_get_sudo_filter(sudo_ctx, sudo_ctx->username, sudo_ctx->uid,
+                                    sudo_ctx->groups, SYSDB_SUDO_FILTER_NGRS
+                                    | SYSDB_SUDO_FILTER_INCLUDE_ALL
+                                    | SYSDB_SUDO_FILTER_INCLUDE_DFL, &filter);
+        if (ret != EOK) {
+            DEBUG(SSSDBG_CRIT_FAILURE, ("Unable to create filter to purge "
+                  "sudoers cache [%d]: %s\n", ret, strerror(ret)));
+            return ret;
+        }
+    }
+
+    /* Purge rules */
+    ret = sysdb_purge_sudorule_subtree(sysdb_ctx, sudo_ctx->be_ctx->domain,
+                                       filter);
+    if (ret != EOK) {
+        DEBUG(SSSDBG_CRIT_FAILURE, ("Unable to purge sudoers cache [%d]: %s\n",
+                                    ret, strerror(ret)));
+        return ret;
+    }
+
+    return EOK;
+}
+
+int sdap_sudo_store_sudoers(struct sdap_sudo_ctx *sudo_ctx,
+                            size_t rules_count,
+                            struct sysdb_attrs **rules)
+{
+    struct sysdb_ctx *sysdb_ctx = sudo_ctx->be_ctx->sysdb;
+    errno_t ret;
+
+    /* Empty sudoers? Done. */
+    if (rules_count == 0 || rules == NULL) {
+        return EOK;
+    }
+
+    ret = sdap_save_native_sudorule_list(sysdb_ctx,
+                                         sudo_ctx->sdap_ctx->opts->sudorule_map,
+                                         rules, rules_count);
+    if (ret != EOK) {
+        DEBUG(SSSDBG_OP_FAILURE, ("failed to save sudo rules [%d]: %s\n",
+              ret, strerror(ret)));
+        return ret;
+    }
+
+    return EOK;
+}
+
+/* alway update cn=defaults and sudoUser=ALL */
+const char *sdap_sudo_build_filter(TALLOC_CTX *mem_ctx,
+                                   struct sdap_attr_map *map,
+                                   const char *username,
+                                   uid_t uid,
+                                   char **groups)
+{
+    char *filter = NULL;
+    char *output = NULL;
+    char *sanitized = NULL;
+    char **group = NULL;
+    int ret;
+
+    if (username == NULL) {
+        return talloc_asprintf(mem_ctx, SDAP_SUDO_FILTER_ALL,
+                               map[SDAP_OC_SUDORULE].name);
+    }
+
+    /* user name */
+    ret = sss_filter_sanitize(filter, username, &sanitized);
+    if (ret != EOK) {
+        goto fail;
+    }
+    filter = talloc_asprintf_append(filter, SDAP_SUDO_FILTER_USERNAME,
+                                    map[SDAP_AT_SUDO_USER].name,
+                                    sanitized);
+    if (filter == NULL) {
+        goto fail;
+    }
+
+    /* user uid */
+    filter = talloc_asprintf_append(filter, SDAP_SUDO_FILTER_UID,
+                                    map[SDAP_AT_SUDO_USER].name,
+                                    uid);
+    if (filter == NULL) {
+        goto fail;
+    }
+
+    /* groups */
+    if (groups != NULL) {
+        for (group = groups; *group != NULL; group++) {
+            ret = sss_filter_sanitize(filter, *group, &sanitized);
+            if (ret != EOK) {
+                goto fail;
+            }
+            filter = talloc_asprintf_append(filter, SDAP_SUDO_FILTER_GROUP,
+                                            map[SDAP_AT_SUDO_USER].name,
+                                            sanitized);
+            if (filter == NULL) {
+                goto fail;
+            }
+        }
+    }
+
+    /* netgroups */
+    /*
+     * FIXME: load only netgroups user is member of
+     * FIXME: add option to disable this filter
+     */
+    filter = talloc_asprintf_append(filter, SDAP_SUDO_FILTER_NETGROUP,
+                                    map[SDAP_AT_SUDO_USER].name,
+                                    "*");
+    if (filter == NULL) {
+        goto fail;
+    }
+
+
+    output = talloc_asprintf(mem_ctx, SDAP_SUDO_FILTER_USER,
+                             map[SDAP_OC_SUDORULE].name,
+                             map[SDAP_AT_SUDO_NAME].name,
+                             SDAP_SUDO_DEFAULTS, /* FIXME: add option for this */
+                             map[SDAP_AT_SUDO_USER].name,
+                             filter);
+
+    talloc_free(filter);
+    return output;
+
+fail:
+    talloc_free(filter);
+    return NULL;
+}