src/providers/ldap/sdap_async_connection.c


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/*
    SSSD

    Async LDAP Helper routines

    Copyright (C) Simo Sorce <ssorce@redhat.com> - 2009
    Copyright (C) 2010, rhafer@suse.de, Novell Inc.

    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 <unistd.h>
#include <fcntl.h>
#include <sasl/sasl.h>
#include "util/util.h"
#include "util/sss_krb5.h"
#include "util/sss_ldap.h"
#include "providers/ldap/sdap_async_private.h"
#include "providers/ldap/ldap_common.h"

errno_t deref_string_to_val(const char *str, int *val)
{
    if (strcasecmp(str, "never") == 0) {
        *val = LDAP_DEREF_NEVER;
    } else if (strcasecmp(str, "searching") == 0) {
        *val = LDAP_DEREF_SEARCHING;
    } else if (strcasecmp(str, "finding") == 0) {
        *val = LDAP_DEREF_FINDING;
    } else if (strcasecmp(str, "always") == 0) {
        *val = LDAP_DEREF_ALWAYS;
    } else {
        DEBUG(1, ("Illegal deref option [%s].\n", str));
        return EINVAL;
    }

    return EOK;
}

/* ==Connect-to-LDAP-Server=============================================== */

struct sdap_rebind_proc_params {
    struct sdap_options *opts;
    struct sdap_handle *sh;
    bool use_start_tls;
};

static int sdap_rebind_proc(LDAP *ldap, LDAP_CONST char *url, ber_tag_t request,
                            ber_int_t msgid, void *params);

struct sdap_connect_state {
    struct tevent_context *ev;
    struct sdap_options *opts;
    struct sdap_handle *sh;
    const char *uri;
    bool use_start_tls;

    struct sdap_op *op;

    struct sdap_msg *reply;
    int result;
};

static void sdap_sys_connect_done(struct tevent_req *subreq);
static void sdap_connect_done(struct sdap_op *op,
                              struct sdap_msg *reply,
                              int error, void *pvt);

struct tevent_req *sdap_connect_send(TALLOC_CTX *memctx,
                                     struct tevent_context *ev,
                                     struct sdap_options *opts,
                                     const char *uri,
                                     struct sockaddr_storage *sockaddr,
                                     bool use_start_tls)
{
    struct tevent_req *req;
    struct tevent_req *subreq;
    struct sdap_connect_state *state;
    int ret;
    int timeout;

    req = tevent_req_create(memctx, &state, struct sdap_connect_state);
    if (!req) return NULL;

    state->reply = talloc(state, struct sdap_msg);
    if (!state->reply) {
        talloc_zfree(req);
        return NULL;
    }

    state->ev = ev;
    state->opts = opts;
    state->use_start_tls = use_start_tls;

    state->uri = talloc_asprintf(state, "%s", uri);
    if (!state->uri) {
        talloc_zfree(req);
        return NULL;
    }

    state->sh = sdap_handle_create(state);
    if (!state->sh) {
        talloc_zfree(req);
        return NULL;
    }

    state->sh->page_size = dp_opt_get_int(state->opts->basic,
                                          SDAP_PAGE_SIZE);

    timeout = dp_opt_get_int(state->opts->basic, SDAP_NETWORK_TIMEOUT);

    subreq = sss_ldap_init_send(state, ev, state->uri, sockaddr,
                                sizeof(struct sockaddr_storage),
                                timeout);
    if (subreq == NULL) {
        ret = ENOMEM;
        DEBUG(1, ("sss_ldap_init_send failed.\n"));
        goto fail;
    }

    tevent_req_set_callback(subreq, sdap_sys_connect_done, req);
    return req;

fail:
    tevent_req_error(req, ret);
    tevent_req_post(req, ev);
    return req;
}

static void sdap_sys_connect_done(struct tevent_req *subreq)
{
    struct tevent_req *req = tevent_req_callback_data(subreq,
                                                      struct tevent_req);
    struct sdap_connect_state *state = tevent_req_data(req,
                                                     struct sdap_connect_state);
    struct timeval tv;
    int ver;
    int lret;
    int optret;
    int ret = EOK;
    int msgid;
    char *errmsg = NULL;
    bool ldap_referrals;
    const char *ldap_deref;
    int ldap_deref_val;
    struct sdap_rebind_proc_params *rebind_proc_params;
    int sd;
    bool sasl_nocanon;
    const char *sasl_mech;
    int sasl_minssf;

    ret = sss_ldap_init_recv(subreq, &state->sh->ldap, &sd);
    talloc_zfree(subreq);
    if (ret != EOK) {
        DEBUG(1, ("sdap_async_connect_call request failed.\n"));
        tevent_req_error(req, ret);
        return;
    }

    ret = setup_ldap_connection_callbacks(state->sh, state->ev);
    if (ret != EOK) {
        DEBUG(1, ("setup_ldap_connection_callbacks failed.\n"));
        goto fail;
    }

    /* If sss_ldap_init_recv() does not return a valid file descriptor we have
     * to assume that the connection callback will be called by internally by
     * the OpenLDAP client library. */
    if (sd != -1) {
        ret = sdap_call_conn_cb(state->uri, sd, state->sh);
        if (ret != EOK) {
            DEBUG(1, ("sdap_call_conn_cb failed.\n"));
            goto fail;
        }
    }

    /* Force ldap version to 3 */
    ver = LDAP_VERSION3;
    lret = ldap_set_option(state->sh->ldap, LDAP_OPT_PROTOCOL_VERSION, &ver);
    if (lret != LDAP_OPT_SUCCESS) {
        DEBUG(1, ("Failed to set ldap version to 3\n"));
        goto fail;
    }

    /* TODO: maybe this can be remove when we go async, currently we need it
     * to handle EINTR during poll(). */
    ret = ldap_set_option(state->sh->ldap, LDAP_OPT_RESTART, LDAP_OPT_ON);
    if (ret != LDAP_OPT_SUCCESS) {
        DEBUG(1, ("Failed to set restart option.\n"));
    }

    /* Set Network Timeout */
    tv.tv_sec = dp_opt_get_int(state->opts->basic, SDAP_NETWORK_TIMEOUT);
    tv.tv_usec = 0;
    lret = ldap_set_option(state->sh->ldap, LDAP_OPT_NETWORK_TIMEOUT, &tv);
    if (lret != LDAP_OPT_SUCCESS) {
        DEBUG(1, ("Failed to set network timeout to %d\n",
                  dp_opt_get_int(state->opts->basic, SDAP_NETWORK_TIMEOUT)));
        goto fail;
    }

    /* Set Default Timeout */
    tv.tv_sec = dp_opt_get_int(state->opts->basic, SDAP_OPT_TIMEOUT);
    tv.tv_usec = 0;
    lret = ldap_set_option(state->sh->ldap, LDAP_OPT_TIMEOUT, &tv);
    if (lret != LDAP_OPT_SUCCESS) {
        DEBUG(1, ("Failed to set default timeout to %d\n",
                  dp_opt_get_int(state->opts->basic, SDAP_OPT_TIMEOUT)));
        goto fail;
    }

    /* Set Referral chasing */
    ldap_referrals = dp_opt_get_bool(state->opts->basic, SDAP_REFERRALS);
    lret = ldap_set_option(state->sh->ldap, LDAP_OPT_REFERRALS,
                           (ldap_referrals ? LDAP_OPT_ON : LDAP_OPT_OFF));
    if (lret != LDAP_OPT_SUCCESS) {
        DEBUG(1, ("Failed to set referral chasing to %s\n",
                  (ldap_referrals ? "LDAP_OPT_ON" : "LDAP_OPT_OFF")));
        goto fail;
    }

    if (ldap_referrals) {
        rebind_proc_params = talloc_zero(state->sh,
                                         struct sdap_rebind_proc_params);
        if (rebind_proc_params == NULL) {
            DEBUG(1, ("talloc_zero failed.\n"));
            ret = ENOMEM;
            goto fail;
        }

        rebind_proc_params->opts = state->opts;
        rebind_proc_params->sh = state->sh;
        rebind_proc_params->use_start_tls = state->use_start_tls;

        lret = ldap_set_rebind_proc(state->sh->ldap, sdap_rebind_proc,
                                    rebind_proc_params);
        if (lret != LDAP_SUCCESS) {
            DEBUG(1, ("ldap_set_rebind_proc failed.\n"));
            goto fail;
        }
    }

    /* Set alias dereferencing */
    ldap_deref = dp_opt_get_string(state->opts->basic, SDAP_DEREF);
    if (ldap_deref != NULL) {
        ret = deref_string_to_val(ldap_deref, &ldap_deref_val);
        if (ret != EOK) {
            DEBUG(1, ("deref_string_to_val failed.\n"));
            goto fail;
        }

        lret = ldap_set_option(state->sh->ldap, LDAP_OPT_DEREF, &ldap_deref_val);
        if (lret != LDAP_OPT_SUCCESS) {
            DEBUG(1, ("Failed to set deref option to %d\n", ldap_deref_val));
            goto fail;
        }

    }

    /* Set host name canonicalization for LDAP SASL bind */
    sasl_nocanon = !dp_opt_get_bool(state->opts->basic, SDAP_SASL_CANONICALIZE);
    lret = ldap_set_option(state->sh->ldap, LDAP_OPT_X_SASL_NOCANON,
                           sasl_nocanon ? LDAP_OPT_ON : LDAP_OPT_OFF);
    if (lret != LDAP_OPT_SUCCESS) {
        /* Do not fail, just warn into both debug logs and syslog */
        DEBUG(SSSDBG_MINOR_FAILURE,
              ("Failed to set LDAP SASL nocanon option to %s. If your system "
               "is configured to use SASL, LDAP operations might fail.\n",
              sasl_nocanon ? "true" : "false"));
        sss_log(SSS_LOG_INFO,
                "Failed to set LDAP SASL nocanon option to %s. If your system "
                "is configured to use SASL, LDAP operations might fail.\n",
                sasl_nocanon ? "true" : "false");
    }

    sasl_mech = dp_opt_get_string(state->opts->basic, SDAP_SASL_MECH);
    if (sasl_mech != NULL) {
        sasl_minssf = dp_opt_get_int(state->opts->basic, SDAP_SASL_MINSSF);
        if (sasl_minssf >= 0) {