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authorNoriko Hosoi <nhosoi@redhat.com>2010-05-12 15:48:42 -0700
committerNoriko Hosoi <nhosoi@redhat.com>2010-05-12 15:48:42 -0700
commitd78de3617b6d6aa3928e3a88b2cba83fec4eaaab (patch)
treedf636e64f513108c1a7e0d4bbdab8188ffebcc23 /include/base
parentfe4d09a3f984fe821635a1147da12dc3510cd4d6 (diff)
590931 - rhds81 import - hardcoded pages_limit for nsslapd-import-cache-autosize
Fix Description: 1. Got rid of the old hardcoded limit 200MB. 2. Introduced the memory hard limit and soft limit. Standalone command line import ldif2db behaves as follows: If import cache autosize is enabled: nsslapd-import-cache-autosize: -1 or 1 ~ 99 (if the value is greater than or equal to 100, it's reset to 50 with a warning.) the import cache size is calculated as nsslapd-import-cache-autosize * pages / 125 (./125 instead of ./100 is for adjusting the BDB overhead.) If import cache is disabled: nsslapd-import-cache-autosize: 0 get the nsslapd-import-cachesize. Calculate the memory size left after allocating the import cache size. If the size is less than the hard limit, it issues an error and quit. If the size is greater than the hard limit and less than the soft limit, it issues a warning, but continues the import task. Note: this function is called only if the import is executed as a stand alone command line (ldif2db).
Diffstat (limited to 'include/base')
0 files changed, 0 insertions, 0 deletions
generated by cgit (git 2.34.1) at 2026-04-25 06:37:10 +0000
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/*
    SSSD

    Kerberos 5 Backend Module - Manage krb5_child

    Authors:
        Sumit Bose <sbose@redhat.com>

    Copyright (C) 2010 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 "util/util.h"
#include "util/child_common.h"
#include "providers/krb5/krb5_common.h"
#include "providers/krb5/krb5_auth.h"
#include "src/providers/krb5/krb5_utils.h"

#ifndef KRB5_CHILD_DIR
#ifndef SSSD_LIBEXEC_PATH
#error "SSSD_LIBEXEC_PATH not defined"
#endif  /* SSSD_LIBEXEC_PATH */

#define KRB5_CHILD_DIR SSSD_LIBEXEC_PATH
#endif /* KRB5_CHILD_DIR */

#define KRB5_CHILD KRB5_CHILD_DIR"/krb5_child"

#define TIME_T_MAX LONG_MAX
#define int64_to_time_t(val) ((time_t)((val) < TIME_T_MAX ? val : TIME_T_MAX))

struct handle_child_state {
    struct tevent_context *ev;
    struct krb5child_req *kr;
    uint8_t *buf;
    ssize_t len;

    struct tevent_timer *timeout_handler;
    pid_t child_pid;

    struct child_io_fds *io;
};

static errno_t pack_authtok(struct io_buffer *buf, size_t *rp,
                            struct sss_auth_token *tok)
{
    uint32_t auth_token_type;
    uint32_t auth_token_length = 0;
    const char *data;
    size_t len;
    errno_t ret = EOK;

    auth_token_type = sss_authtok_get_type(tok);

    switch (auth_token_type) {
    case SSS_AUTHTOK_TYPE_EMPTY:
        auth_token_length = 0;
        data = "";
        break;
    case SSS_AUTHTOK_TYPE_PASSWORD:
        ret = sss_authtok_get_password(tok, &data, &len);
        auth_token_length = len + 1;
        break;
    case SSS_AUTHTOK_TYPE_CCFILE:
        ret = sss_authtok_get_ccfile(tok, &data, &len);
        auth_token_length = len + 1;
        break;
    case SSS_AUTHTOK_TYPE_2FA:
        data = (char *) sss_authtok_get_data(tok);
        auth_token_length = sss_authtok_get_size(tok);
        break;
    default:
        ret = EINVAL;
    }

    if (ret == EOK) {
        SAFEALIGN_COPY_UINT32(&buf->data[*rp], &auth_token_type, rp);
        SAFEALIGN_COPY_UINT32(&buf->data[*rp], &auth_token_length, rp);
        safealign_memcpy(&buf->data[*rp], data, auth_token_length, rp);
    }

    return ret;
}

static errno_t create_send_buffer(struct krb5child_req *kr,
                                  struct io_buffer **io_buf)
{
    struct io_buffer *buf;
    size_t rp;
    const char *keytab;
    uint32_t validate;
    uint32_t send_pac;
    uint32_t use_enterprise_principal;
    size_t username_len = 0;
    errno_t ret;

    keytab = dp_opt_get_cstring(kr->krb5_ctx->opts, KRB5_KEYTAB);
    if (keytab == NULL) {
        DEBUG(SSSDBG_CRIT_FAILURE, "Missing keytab option.\n");
        return EINVAL;
    }

    validate = dp_opt_get_bool(kr->krb5_ctx->opts, KRB5_VALIDATE) ? 1 : 0;

    /* Always send PAC except for local IPA users and IPA server mode */
    switch (kr->krb5_ctx->config_type) {
        case K5C_IPA_CLIENT:
            send_pac = kr->upn_from_different_realm ? 1 : 0;
            break;
        case K5C_IPA_SERVER:
            send_pac = 0;
            break;
        default:
            send_pac = 1;
            break;
    }

    if (kr->pd->cmd == SSS_CMD_RENEW || kr->is_offline) {
        use_enterprise_principal = false;
    } else {
        use_enterprise_principal = dp_opt_get_bool(kr->krb5_ctx->opts,
                                         KRB5_USE_ENTERPRISE_PRINCIPAL) ? 1 : 0;
    }

    buf = talloc(kr, struct io_buffer);
    if (buf == NULL) {
        DEBUG(SSSDBG_CRIT_FAILURE, "talloc failed.\n");
        return ENOMEM;
    }

    buf->size = 8*sizeof(uint32_t) + strlen(kr->upn);

    if (kr->pd->cmd == SSS_PAM_AUTHENTICATE ||
        kr->pd->cmd == SSS_CMD_RENEW ||
        kr->pd->cmd == SSS_PAM_CHAUTHTOK_PRELIM ||
        kr->pd->cmd == SSS_PAM_CHAUTHTOK) {
        buf->size += 4*sizeof(uint32_t) + strlen(kr->ccname) + strlen(keytab) +
                     sss_authtok_get_size(kr->pd->authtok);

        buf->size += sizeof(uint32_t);
        if (kr->old_ccname) {
            buf->size += strlen(kr->old_ccname);
        }
    }

    if (kr->pd->cmd == SSS_PAM_CHAUTHTOK) {
        buf->size += 2*sizeof(uint32_t) +
                     sss_authtok_get_size(kr->pd->newauthtok);
    }

    if (kr->pd->cmd == SSS_PAM_ACCT_MGMT) {
        username_len = strlen(kr->pd->user);
        buf->size += sizeof(uint32_t) + username_len;
    }

    buf->data = talloc_size(kr, buf->size);
    if (buf->data == NULL) {
        DEBUG(SSSDBG_CRIT_FAILURE, "talloc_size failed.\n");
        talloc_free(buf);
        return ENOMEM;
    }

    rp = 0;
    SAFEALIGN_COPY_UINT32(&buf->data[rp], &kr->pd->cmd, &rp);
    SAFEALIGN_COPY_UINT32(&buf->data[rp], &kr->uid, &rp);
    SAFEALIGN_COPY_UINT32(&buf->data[rp], &kr->gid, &rp);
    SAFEALIGN_COPY_UINT32(&buf->data[rp], &validate, &rp);
    SAFEALIGN_COPY_UINT32(&buf->data[rp], &kr->is_offline, &rp);
    SAFEALIGN_COPY_UINT32(&buf->data[rp], &send_pac, &rp);
    SAFEALIGN_COPY_UINT32(&buf->data[rp], &use_enterprise_principal, &rp);

    SAFEALIGN_SET_UINT32(&buf->data[rp], strlen(kr->upn), &rp);
    safealign_memcpy(&buf->data[rp], kr->upn, strlen(kr->upn), &rp);

    if (kr->pd->cmd == SSS_PAM_AUTHENTICATE ||
        kr->pd->cmd == SSS_CMD_RENEW ||
        kr->pd->cmd == SSS_PAM_CHAUTHTOK_PRELIM ||
        kr->pd->cmd == SSS_PAM_CHAUTHTOK) {
        SAFEALIGN_SET_UINT32(&buf->data[rp], strlen(kr->ccname), &rp);
        safealign_memcpy(&buf->data[rp], kr->ccname, strlen(kr->ccname), &rp);

        if (kr->old_ccname) {
            SAFEALIGN_SET_UINT32(&buf->data[rp], strlen(kr->old_ccname), &rp);
            safealign_memcpy(&buf->data[rp], kr->old_ccname,
                             strlen(kr->old_ccname), &rp);
        } else {
            SAFEALIGN_SET_UINT32(&buf->data[rp], 0, &rp);
        }

        SAFEALIGN_SET_UINT32(&buf->data[rp], strlen(keytab), &rp);
        safealign_memcpy(&buf->data[rp], keytab, strlen(keytab), &rp);

        ret = pack_authtok(buf, &rp, kr->pd->authtok);
        if (ret) {
            return ret;
        }
    }

    if (kr->pd->cmd == SSS_PAM_CHAUTHTOK) {
        ret = pack_authtok(buf, &rp, kr->pd->newauthtok);
        if (ret) {
            return ret;
        }
    }

    if (kr->pd->cmd == SSS_PAM_ACCT_MGMT) {
        SAFEALIGN_SET_UINT32(&buf->data[rp], username_len, &rp);
        safealign_memcpy(&buf->data[rp], kr->pd->user, username_len, &rp);
    }

    *io_buf = buf;

    return EOK;
}


static void krb5_child_timeout(struct tevent_context *ev,
                               struct tevent_timer *te,
                               struct timeval tv, void *pvt)
{
    struct tevent_req *req = talloc_get_type(pvt, struct tevent_req);
    struct handle_child_state *state = tevent_req_data(req,
                                                     struct handle_child_state);
    int ret;

    if (state->timeout_handler == NULL) {
        return;
    }

    DEBUG(SSSDBG_IMPORTANT_INFO,
          "Timeout for child [%d] reached. In case KDC is distant or network "
           "is slow you may consider increasing value of krb5_auth_timeout.\n",
           state->child_pid);

    ret = kill(state->child_pid, SIGKILL);
    if (ret == -1) {
        DEBUG(SSSDBG_CRIT_FAILURE,
              "kill failed [%d][%s].\n", errno, strerror(errno));
    }

    tevent_req_error(req, ETIMEDOUT);
}

static errno_t activate_child_timeout_handler(struct tevent_req *req,
                                              struct tevent_context *ev,
                                              const uint32_t timeout_seconds)
{
    struct timeval tv;
    struct handle_child_state *state = tevent_req_data(req,
                                                     struct handle_child_state);

    tv = tevent_timeval_current();
    tv = tevent_timeval_add(&tv, timeout_seconds, 0);
    state->timeout_handler = tevent_add_timer(ev, state, tv,
                                           krb5_child_timeout, req);
    if (state->timeout_handler == NULL) {
        DEBUG(SSSDBG_CRIT_FAILURE, "tevent_add_timer failed.\n");
        return ENOMEM;
    }

    return EOK;
}

static errno_t fork_child(struct tevent_req *req)
{
    int pipefd_to_child[2] = PIPE_INIT;
    int pipefd_from_child[2] = PIPE_INIT;
    pid_t pid;
    errno_t ret;
    struct handle_child_state *state = tevent_req_data(req,
                                                     struct handle_child_state);
    const char *k5c_extra_args[3];

    k5c_extra_args[0] = talloc_asprintf(state, "--fast-ccache-uid=%"SPRIuid, getuid());
    k5c_extra_args[1] = talloc_asprintf(state, "--fast-ccache-gid=%"SPRIgid, getgid());
    k5c_extra_args[2] = NULL;
    if (k5c_extra_args[0] == NULL || k5c_extra_args[1] == NULL) {
        return ENOMEM;
    }

    ret = pipe(pipefd_from_child);
    if (ret == -1) {
        ret = errno;
        DEBUG(SSSDBG_CRIT_FAILURE,
              "pipe failed [%d][%s].\n", errno, strerror(errno));
        goto fail;
    }
    ret = pipe(pipefd_to_child);
    if (ret == -1) {
        ret = errno;
        DEBUG(SSSDBG_CRIT_FAILURE,
              "pipe failed [%d][%s].\n", errno, strerror(errno));
        goto fail;
    }

    pid = fork();

    if (pid == 0) { /* child */
        exec_child_ex(state,
                      pipefd_to_child, pipefd_from_child,
                      KRB5_CHILD, state->kr->krb5_ctx->child_debug_fd,
                      k5c_extra_args, false, STDIN_FILENO, STDOUT_FILENO);

        /* We should never get here */
        DEBUG(SSSDBG_CRIT_FAILURE, "BUG: Could not exec KRB5 child\n");
    } else if (pid > 0) { /* parent */
        state->child_pid = pid;
        state->io->read_from_child_fd = pipefd_from_child[0];
        PIPE_FD_CLOSE(pipefd_from_child[1]);
        state->io->write_to_child_fd = pipefd_to_child[1];
        PIPE_FD_CLOSE(pipefd_to_child[0]);
        sss_fd_nonblocking(state->io->read_from_child_fd);
        sss_fd_nonblocking(state->io->write_to_child_fd);

        ret = child_handler_setup(state->ev, pid, NULL, NULL, NULL);
        if (ret != EOK) {
            DEBUG(SSSDBG_CRIT_FAILURE,
                  "Could not set up child signal handler\n");
            goto fail;
        }

        ret = activate_child_timeout_handler(req, state->ev,
                  dp_opt_get_int(state->kr->krb5_ctx->opts, KRB5_AUTH_TIMEOUT));
        if (ret != EOK) {
            DEBUG(SSSDBG_CRIT_FAILURE,
                  "activate_child_timeout_handler failed.\n");
        }

    } else { /* error */
        ret = errno;
        DEBUG(SSSDBG_CRIT_FAILURE,
              "fork failed [%d][%s].\n", errno, strerror(ret));
        goto fail;
    }

    return EOK;

fail:
    PIPE_CLOSE(pipefd_from_child);
    PIPE_CLOSE(pipefd_to_child);
    return ret;
}

static void handle_child_step(struct tevent_req *subreq);
static void handle_child_done(struct tevent_req *subreq);

struct tevent_req *handle_child_send(TALLOC_CTX *mem_ctx,
                                     struct tevent_context *ev,
                                     struct krb5child_req *kr)
{
    struct tevent_req *req, *subreq;
    struct handle_child_state *state;
    int ret;
    struct io_buffer *buf = NULL;

    req = tevent_req_create(mem_ctx, &state, struct handle_child_state);
    if (req == NULL) {
        return NULL;
    }

    state->ev = ev;
    state->kr = kr;
    state->buf = NULL;
    state->len = 0;
    state->child_pid = -1;
    state->timeout_handler = NULL;

    state->io = talloc(state, struct child_io_fds);
    if (state->io == NULL) {
        DEBUG(SSSDBG_CRIT_FAILURE, "talloc failed.\n");
        ret = ENOMEM;
        goto fail;
    }
    state->io->write_to_child_fd = -1;
    state->io->read_from_child_fd = -1;
    talloc_set_destructor((void *) state->io, child_io_destructor);

    ret = create_send_buffer(kr, &buf);
    if (ret != EOK) {
        DEBUG(SSSDBG_CRIT_FAILURE, "create_send_buffer failed.\n");
        goto fail;
    }

    ret = fork_child(req);
    if (ret != EOK) {
        DEBUG(SSSDBG_CRIT_FAILURE, "fork_child failed.\n");
        goto fail;
    }

    subreq = write_pipe_send(state, ev, buf->data, buf->size,
                             state->io->write_to_child_fd);
    if (!subreq) {
        ret = ENOMEM;
        goto fail;
    }
    tevent_req_set_callback(subreq, handle_child_step, req);

    return req;

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

static void handle_child_step(struct tevent_req *subreq)
{
    struct tevent_req *req = tevent_req_callback_data(subreq,
                                                      struct tevent_req);
    struct handle_child_state *state = tevent_req_data(req,
                                                    struct handle_child_state);
    int ret;

    ret = write_pipe_recv(subreq);
    talloc_zfree(subreq);
    if (ret != EOK) {
        tevent_req_error(req, ret);
        return;
    }

    PIPE_FD_CLOSE(state->io->write_to_child_fd);

    subreq = read_pipe_send(state, state->ev, state->io->read_from_child_fd);
    if (!subreq) {
        tevent_req_error(req, ENOMEM);
        return;
    }
    tevent_req_set_callback(subreq, handle_child_done, req);
}

static void handle_child_done(struct tevent_req *subreq)
{
    struct tevent_req *req = tevent_req_callback_data(subreq,
                                                      struct tevent_req);
    struct handle_child_state *state = tevent_req_data(req,
                                                    struct handle_child_state);
    int ret;

    talloc_zfree(state->timeout_handler);

    ret = read_pipe_recv(subreq, state, &state->buf, &state->len);
    talloc_zfree(subreq);
    if (ret != EOK) {
        tevent_req_error(req, ret);
        return;
    }

    PIPE_FD_CLOSE(state->io->read_from_child_fd);

    tevent_req_done(req);
    return;
}

int handle_child_recv(struct tevent_req *req, TALLOC_CTX *mem_ctx,
                      uint8_t **buf, ssize_t *len)
{
    struct handle_child_state *state = tevent_req_data(req,
                                                    struct handle_child_state);

    TEVENT_REQ_RETURN_ON_ERROR(req);

    *buf = talloc_move(mem_ctx, &state->buf);
    *len = state->len;

    return EOK;
}