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authorGuannan Ren <gren@redhat.com>2013-03-22 11:51:48 +0800
committerGuannan Ren <gren@redhat.com>2013-03-22 11:51:48 +0800
commit2d40f8a365c398ba62ddb11865bc45bb84ff7e8d (patch)
treeb497c019664fa6bc22c580508390648a8843e1f8 /tests/Makefile.am
parent497a0ceecbdf4dc72f20612cf2a88a1e551bc8f4 (diff)
make: regenerate bindings when <classname>.py changes
Diffstat (limited to 'tests/Makefile.am')
0 files changed, 0 insertions, 0 deletions
generated by cgit (git 2.34.1) at 2026-03-01 23:54:55 +0000
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/*
    SSSD

    Kerberos 5 Backend Module -- tgt_req and changepw child

    Authors:
        Sumit Bose <sbose@redhat.com>

    Copyright (C) 2009-2010 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 <sys/types.h>
#include <unistd.h>
#include <sys/stat.h>
#include <popt.h>

#include <security/pam_modules.h>

#include "util/util.h"
#include "util/sss_krb5.h"
#include "util/user_info_msg.h"
#include "util/child_common.h"
#include "providers/dp_backend.h"
#include "providers/krb5/krb5_auth.h"
#include "providers/krb5/krb5_utils.h"
#include "sss_cli.h"

#define SSSD_KRB5_CHANGEPW_PRINCIPAL "kadmin/changepw"

struct krb5_req {
    krb5_context ctx;
    krb5_principal princ;
    char* name;
    krb5_creds *creds;
    krb5_get_init_creds_opt *options;

    struct pam_data *pd;

    char *realm;
    char *ccname;
    char *keytab;
    bool validate;
    bool send_pac;
    bool use_enterprise_princ;
    char *fast_ccname;

    const char *upn;
    uid_t uid;
    gid_t gid;
};

static krb5_context krb5_error_ctx;
#define KRB5_CHILD_DEBUG(level, error) KRB5_DEBUG(level, krb5_error_ctx, error)

static krb5_error_code get_changepw_options(krb5_context ctx,
                                            krb5_get_init_creds_opt **_options)
{
    krb5_get_init_creds_opt *options;
    krb5_error_code kerr;

    kerr = sss_krb5_get_init_creds_opt_alloc(ctx, &options);
    if (kerr != 0) {
        KRB5_CHILD_DEBUG(SSSDBG_CRIT_FAILURE, kerr);
        return kerr;
    }

    sss_krb5_get_init_creds_opt_set_canonicalize(options, 0);
    krb5_get_init_creds_opt_set_forwardable(options, 0);
    krb5_get_init_creds_opt_set_proxiable(options, 0);
    krb5_get_init_creds_opt_set_renew_life(options, 0);
    krb5_get_init_creds_opt_set_tkt_life(options, 5*60);

    *_options = options;

    return 0;
}

static errno_t sss_send_pac(krb5_authdata **pac_authdata)
{
    struct sss_cli_req_data sss_data;
    int ret;
    int errnop;

    sss_data.len = pac_authdata[0]->length;
    sss_data.data = pac_authdata[0]->contents;

    ret = sss_pac_make_request(SSS_PAC_ADD_PAC_USER, &sss_data,
                               NULL, NULL, &errnop);
    if (ret != NSS_STATUS_SUCCESS || errnop != 0) {
        DEBUG(SSSDBG_OP_FAILURE, ("sss_pac_make_request failed [%d][%d].\n",
                                  ret, errnop));
        return EIO;
    }

    return EOK;
}

static void sss_krb5_expire_callback_func(krb5_context context, void *data,
                                          krb5_timestamp password_expiration,
                                          krb5_timestamp account_expiration,
                                          krb5_boolean is_last_req)
{
    int ret;
    uint32_t *blob;
    long exp_time;
    struct krb5_req *kr = talloc_get_type(data, struct krb5_req);

    if (password_expiration == 0) {
        return;
    }

    exp_time = password_expiration - time(NULL);
    if (exp_time < 0 || exp_time > UINT32_MAX) {
        DEBUG(1, ("Time to expire out of range.\n"));
        return;
    }
    DEBUG(SSSDBG_TRACE_INTERNAL, ("exp_time: [%ld]\n", exp_time));

    blob = talloc_array(kr->pd, uint32_t, 2);
    if (blob == NULL) {
        DEBUG(1, ("talloc_size failed.\n"));
        return;
    }

    blob[0] = SSS_PAM_USER_INFO_EXPIRE_WARN;
    blob[1] = (uint32_t) exp_time;

    ret = pam_add_response(kr->pd, SSS_PAM_USER_INFO, 2 * sizeof(uint32_t),
                           (uint8_t *) blob);
    if (ret != EOK) {
        DEBUG(1, ("pam_add_response failed.\n"));
    }

    return;
}

#ifdef HAVE_KRB5_GET_INIT_CREDS_OPT_SET_RESPONDER
/*
 * TODO: These features generally would requires a significant refactoring
 * of SSSD and MIT krb5 doesn't support them anyway. They are listed here
 * simply as a reminder of things that might become future feature potential.
 *
 *   1. tokeninfo selection
 *   2. challenge
 *   3. discreet token/pin prompting
 *   4. interactive otp format correction
 *   5. nextOTP
 *
 */
typedef int (*checker)(int c);

static inline checker pick_checker(int format)
{
    switch (format) {
    case KRB5_RESPONDER_OTP_FORMAT_DECIMAL:
        return isdigit;
    case KRB5_RESPONDER_OTP_FORMAT_HEXADECIMAL:
        return isxdigit;
    case KRB5_RESPONDER_OTP_FORMAT_ALPHANUMERIC:
        return isalnum;
    }

    return NULL;
}

static int token_pin_destructor(char *mem)
{
    safezero(mem, strlen(mem));
    return 0;
}

static krb5_error_code tokeninfo_matches(TALLOC_CTX *mem_ctx,
                                         const krb5_responder_otp_tokeninfo *ti,
                                         const char *pwd, size_t len,
                                         char **out_token, char **out_pin)
{
    char *token = NULL, *pin = NULL;
    checker check = NULL;
    int i;


    if (ti->flags & KRB5_RESPONDER_OTP_FLAGS_NEXTOTP) {
        return ENOTSUP;
    }

    if (ti->challenge != NULL) {
        return ENOTSUP;
    }

    /* This is a non-sensical value. */
    if (ti->length == 0) {
        return EPROTO;
    }

    if (ti->flags & KRB5_RESPONDER_OTP_FLAGS_COLLECT_TOKEN) {
        /* ASSUMPTION: authtok has one of the following formats:
         *   1. TokenValue
         *   2. PIN+TokenValue
         */
        token = talloc_strndup(mem_ctx, pwd, len);
        if (token == NULL) {
            return ENOMEM;
        }
        talloc_set_destructor(token, token_pin_destructor);

        if (ti->flags & KRB5_RESPONDER_OTP_FLAGS_COLLECT_PIN) {
            /* If the server desires a separate pin, we will split it.
             * ASSUMPTION: Format of authtok is PIN+TokenValue. */
            if (ti->flags & KRB5_RESPONDER_OTP_FLAGS_SEPARATE_PIN) {
                if (ti->length < 1) {
                    talloc_free(token);
                    return ENOTSUP;
                }

                if (ti->length >= len) {
                    talloc_free(token);
                    return EMSGSIZE;
                }

                /* Copy the PIN from the front of the value. */
                pin = talloc_strndup(NULL, pwd, len - ti->length);
                if (pin == NULL) {
                    talloc_free(token);
                    return ENOMEM;
                }
                talloc_set_destructor(pin, token_pin_destructor);

                /* Remove the PIN from the front of the token value. */
                memmove(token, token + len - ti->length, ti->length + 1);

                check = pick_checker(ti->format);
            } else {
                if (ti->length > 0 && ti->length > len) {
                    talloc_free(token);
                    return EMSGSIZE;
                }
            }
        } else {
            if (ti->length > 0 && ti->length != len) {
                talloc_free(token);
                return EMSGSIZE;
            }

            check = pick_checker(ti->format);
        }
    } else {
        pin = talloc_strndup(mem_ctx, pwd, len);
        if (pin == NULL) {
            return ENOMEM;
        }
        talloc_set_destructor(pin, token_pin_destructor);
    }

    /* If check is set, we need to verify the contents of the token. */
    for (i = 0; check != NULL && token[i] != '\0'; i++) {
        if (!check(token[i])) {
            talloc_free(token);
            talloc_free(pin);
            return EBADMSG;
        }
    }

    *out_token = token;
    *out_pin = pin;
    return 0;
}

static krb5_error_code answer_otp(krb5_context ctx,
                                  struct krb5_req *kr,
                                  krb5_responder_context rctx)
{
    krb5_responder_otp_challenge *chl;
    char *token = NULL, *pin = NULL;
    const char *pwd = NULL;
    krb5_error_code ret;
    size_t i, len;

    ret = krb5_responder_otp_get_challenge(ctx, rctx, &chl);
    if (ret != EOK || chl == NULL) {
        /* Either an error, or nothing to do. */
        return ret;
    }

    if (chl->tokeninfo == NULL || chl->tokeninfo[0] == NULL) {
        /* No tokeninfos? Absurd! */
        ret = EINVAL;
        goto done;
    }

    /* Validate our assumptions about the contents of authtok. */
    ret = sss_authtok_get_password(kr->pd->authtok, &pwd, &len);
    if (ret != EOK)
        goto done;

    /* Find the first supported tokeninfo which matches our authtoken. */
    for (i = 0; chl->tokeninfo[i] != NULL; i++) {
        ret = tokeninfo_matches(kr, chl->tokeninfo[i], pwd, len, &token, &pin);
        if (ret == EOK) {
            break;
        }

        switch (ret) {
        case EBADMSG:
        case EMSGSIZE:
        case ENOTSUP:
        case EPROTO:
            break;
        default:
            goto done;
        }
    }
    if (chl->tokeninfo[i] == NULL) {
        DEBUG(SSSDBG_CRIT_FAILURE,
              ("No tokeninfos found which match our credentials.\n"));
        ret = EOK;
        goto done;
    }

    if (chl->tokeninfo[i]->flags & KRB5_RESPONDER_OTP_FLAGS_COLLECT_TOKEN) {
        /* Don't let SSSD cache the OTP authtok since it is single-use. */
        ret = pam_add_response(kr->pd, SSS_OTP, 0, NULL);
        if (ret != EOK) {
            DEBUG(1, ("pam_add_response failed.\n"));
            goto done;
        }
    }

    /* Respond with the appropriate answer. */
    ret = krb5_responder_otp_set_answer(ctx, rctx, i, token, pin);
done:
    talloc_free(token);
    talloc_free(pin);
    krb5_responder_otp_challenge_free(ctx, rctx, chl);
    return ret;
}

static krb5_error_code sss_krb5_responder(krb5_context ctx,
                                          void *data,
                                          krb5_responder_context rctx)
{
    struct krb5_req *kr = talloc_get_type(data, struct krb5_req);

    if (kr == NULL) {
        return EINVAL;
    }

    return answer_otp(ctx, kr, rctx);
}
#endif

static krb5_error_code sss_krb5_prompter(krb5_context context, void *data,
                                         const char *name, const char *banner,
                                         int num_prompts, krb5_prompt prompts[])
{
    int ret;
    struct krb5_req *kr = talloc_get_type(data, struct krb5_req);

    if (num_prompts != 0) {
        DEBUG(1, ("Cannot handle password prompts.\n"));
        return KRB5_LIBOS_CANTREADPWD;
    }

    if (banner == NULL || *banner == '\0') {
        DEBUG(5, ("Prompter called with empty banner, nothing to do.\n"));
        return EOK;
    }

    DEBUG(SSSDBG_FUNC_DATA, ("Prompter called with [%s].\n", banner));

    ret = pam_add_response(kr->pd, SSS_PAM_TEXT_MSG, strlen(banner)+1,
                           (const uint8_t *) banner);
    if (ret != EOK) {
        DEBUG(1, ("pam_add_response failed.\n"));
    }

    return EOK;
}


static krb5_error_code create_empty_cred(krb5_context ctx, krb5_principal princ,
                                         krb5_creds **_cred)
{
    krb5_error_code kerr;
    krb5_creds *cred = NULL;
    krb5_data *krb5_realm;

    cred = calloc(sizeof(krb5_creds), 1);
    if (cred == NULL) {
        DEBUG(1, ("calloc failed.\n"));
        return ENOMEM;
    }

    kerr = krb5_copy_principal(ctx, princ, &cred->client);
    if (kerr != 0) {
        DEBUG(1, ("krb5_copy_principal failed.\n"));
        goto done;
    }

    krb5_realm = krb5_princ_realm(ctx, princ);

    kerr = krb5_build_principal_ext(ctx, &cred->server,
                                    krb5_realm->length, krb5_realm->data,
                                    KRB5_TGS_NAME_SIZE, KRB5_TGS_NAME,
                                    krb5_realm->length, krb5_realm->data, 0);
    if (kerr != 0) {
        DEBUG(1, ("krb5_build_principal_ext failed.\n"));
        goto done;
    }

    DEBUG(SSSDBG_TRACE_INTERNAL, ("Created empty krb5_creds.\n"));

done:
    if (kerr != 0) {
        krb5_free_creds(ctx, cred);
    } else {
        *_cred = cred;
    }

    return kerr;
}


static errno_t handle_randomized(char *in)
{
    size_t ccname_len;
    char *ccname = NULL;
    int ret;
    int fd;
    mode_t old_umask;

    /* We only treat the FILE type case in a special way due to the history
     * of storing FILE type ccache in /tmp and associated security issues */
    if (in[0] == '/') {
        ccname = in;
    } else if (strncmp(in, "FILE:", 5) == 0) {
        ccname = in + 5;
    } else {
        return EOK;
    }

    ccname_len = strlen(ccname);
    if (ccname_len >= 6 && strcmp(ccname + (ccname_len - 6), "XXXXXX") == 0) {
        /* NOTE: this call is only used to create a unique name, as later
         * krb5_cc_initialize() will unlink and recreate the file.
         * This is ok because this part of the code is called with
         * privileges already dropped when handling user ccache, or the ccache
         * is stored in a private directory. So we do not have huge issues if
         * something races, we mostly care only about not accidentally use
         * an existing name and thus failing in the process of saving the
         * cache. Malicious races can only be avoided by libkrb5 itself. */
        old_umask = umask(077);
        fd = mkstemp(ccname);
        umask(old_umask);
        if (fd == -1) {
            ret = errno;
            DEBUG(SSSDBG_CRIT_FAILURE, ("mkstemp(\"%s\") failed!\n", ccname));
            return ret;
        }
    }

    return EOK;
}

/* NOTE: callers rely on 'name' being *changed* if it needs to be randomized,
 * as they will then send the name back to the new name via the return call
 * k5c_attach_ccname_msg(). Callers will send in a copy of the name if they
 * do not care for changes. */
static krb5_error_code create_ccache(char *ccname, krb5_creds *creds)
{
    krb5_context kctx = NULL;
    krb5_ccache kcc = NULL;
    const char *type;
    krb5_error_code kerr;
#ifdef HAVE_KRB5_CC_COLLECTION
    krb5_ccache cckcc;
    bool switch_to_cc = false;
#endif

    /* Set a restrictive umask, just in case we end up creating any file */
    umask(077);

    /* we create a new context here as the main process one may have been
     * opened as root and contain possibly references (even open handles ?)
     * to resources we do not have or do not want to have access to */
    kerr = krb5_init_context(&kctx);
    if (kerr) {
        KRB5_CHILD_DEBUG(SSSDBG_CRIT_FAILURE, kerr);
        return ERR_INTERNAL;
    }

    kerr = handle_randomized(ccname);
    if (kerr) goto done;

    kerr = krb5_cc_resolve(kctx, ccname, &kcc);
    if (kerr) goto done;

    type = krb5_cc_get_type(kctx, kcc);
    DEBUG(SSSDBG_TRACE_ALL, ("Initializing ccache of type [%s]\n", type));

#ifdef HAVE_KRB5_CC_COLLECTION
    if (krb5_cc_support_switch(kctx, type)) {
        kerr = krb5_cc_set_default_name(kctx, ccname);
        if (kerr) goto done;

        kerr = krb5_cc_cache_match(kctx, creds->client, &cckcc);
        if (kerr == KRB5_CC_NOTFOUND) {
            kerr = krb5_cc_new_unique(kctx, type, NULL, &cckcc);
            switch_to_cc = true;
        }
        if (kerr) goto done;
        krb5_cc_close(kctx, kcc);
        kcc = cckcc;
    }
#endif

    kerr = krb5_cc_initialize(kctx, kcc, creds->client);
    if (kerr) goto done;

    kerr = krb5_cc_store_cred(kctx, kcc, creds);
    if (kerr) goto done;

#ifdef HAVE_KRB5_CC_COLLECTION
    if (switch_to_cc) {
        kerr = krb5_cc_switch(kctx, kcc);
        if (kerr) goto done;
    }
#endif

done:
    if (kcc) {
        /* FIXME: should we krb5_cc_destroy in case of error ? */
        krb5_cc_close(kctx, kcc);
    }
    return kerr;
}

static errno_t pack_response_packet(TALLOC_CTX *mem_ctx, errno_t error,
                                    struct response_data *resp_list,
                                    uint8_t **_buf, size_t *_len)
{
    uint8_t *buf;
    size_t size = 0;
    size_t p = 0;
    struct response_data *pdr;

    /* A buffer with the following structure must be created:
     * int32_t status of the request (required)
     * message (zero or more)
     *
     * A message consists of:
     * int32_t type of the message
     * int32_t length of the following data
     * uint8_t[len] data
     */

    size = sizeof(int32_t);

    for (pdr = resp_list; pdr != NULL; pdr = pdr->next) {
        size += 2*sizeof(int32_t) + pdr->len;
    }

    buf = talloc_array(mem_ctx, uint8_t, size);
    if (!buf) {
        DEBUG(1, ("Insufficient memory to create message.\n"));
        return ENOMEM;
    }

    SAFEALIGN_SET_INT32(&buf[p], error, &p);

    for (pdr = resp_list; pdr != NULL; pdr = pdr->next) {
        SAFEALIGN_SET_INT32(&buf[p], pdr->type, &p);
        SAFEALIGN_SET_INT32(&buf[p], pdr->len, &p);
        safealign_memcpy(&buf[p], pdr->data, pdr->len, &p);
    }

    DEBUG(SSSDBG_TRACE_INTERNAL, ("response packet size: [%zu]\n", p));

    *_buf = buf;
    *_len = p;
    return EOK;
}

static errno_t k5c_attach_ccname_msg(struct krb5_req *kr)
{
    char *msg = NULL;
    int ret;

    if (kr->ccname == NULL) {
        DEBUG(1, ("Error obtaining ccname.\n"));
        return ERR_INTERNAL;
    }

    msg = talloc_asprintf(kr, "%s=%s",CCACHE_ENV_NAME, kr->ccname);
    if (msg == NULL) {
        DEBUG(1, ("talloc_asprintf failed.\n"));
        return ENOMEM;
    }

    ret = pam_add_response(kr->pd, SSS_PAM_ENV_ITEM,
                           strlen(msg) + 1, (uint8_t *)msg);
    talloc_zfree(msg);

    return ret;
}

static errno_t k5c_send_data(struct krb5_req *kr, int fd, errno_t error)
{
    size_t written;
    uint8_t *buf;
    size_t len;
    int ret;

    ret = pack_response_packet(kr, error, kr->pd->resp_list, &buf, &len);
    if (ret != EOK) {
        DEBUG(1, ("pack_response_packet failed.\n"));
        return ret;
    }

    errno = 0;
    written = sss_atomic_write_s(fd, buf, len);
    if (written == -1) {
        ret = errno;
        DEBUG(SSSDBG_CRIT_FAILURE,
              ("write failed [%d][%s].\n", ret, strerror(ret)));
        return ret;
    }

    if (written != len) {
        DEBUG(SSSDBG_CRIT_FAILURE,
              ("Write error, wrote [%zu] bytes, expected [%zu]\n",
               written, len));
        return EOK;
    }

    DEBUG(SSSDBG_TRACE_ALL, ("Response sent.\n"));

    return EOK;
}

static errno_t add_ticket_times_and_upn_to_response(struct krb5_req *kr)
{
    int ret;
    int64_t t[4];
    krb5_error_code kerr;
    char *upn = NULL;
    unsigned int upn_len = 0;

    t[0] = (int64_t) kr->creds->times.authtime;
    t[1] = (int64_t) kr->creds->times.starttime;
    t[2] = (int64_t) kr->creds->times.endtime;
    t[3] = (int64_t) kr->creds->times.renew_till;

    ret = pam_add_response(kr->pd, SSS_KRB5_INFO_TGT_LIFETIME,
                           4*sizeof(int64_t), (uint8_t *) t);
    if (ret != EOK) {
        DEBUG(1, ("pack_response_packet failed.\n"));
        goto done;
    }

    kerr = krb5_unparse_name_ext(kr->ctx, kr->creds->client, &upn, &upn_len);
    if (kerr != 0) {
        DEBUG(SSSDBG_OP_FAILURE, ("krb5_unparse_name failed.\n"));
        goto done;
    }

    ret = pam_add_response(kr->pd, SSS_KRB5_INFO_UPN, upn_len,
                           (uint8_t *) upn);
    krb5_free_unparsed_name(kr->ctx, upn);
    if (ret != EOK) {
        DEBUG(1, ("pack_response_packet failed.\n"));
        goto done;
    }

done:
    return ret;
}

static krb5_error_code validate_tgt(struct krb5_req *kr)
{
    krb5_error_code kerr;
    krb5_error_code kt_err;
    char *principal = NULL;
    krb5_keytab keytab;
    krb5_kt_cursor cursor;
    krb5_keytab_entry entry;
    krb5_verify_init_creds_opt opt;
    krb5_principal validation_princ = NULL;
    bool realm_entry_found = false;
    krb5_ccache validation_ccache = NULL;
    krb5_authdata **pac_authdata = NULL;

    memset(&keytab, 0, sizeof(keytab));
    kerr = krb5_kt_resolve(kr->ctx, kr->keytab, &keytab);
    if (kerr != 0) {
        DEBUG(SSSDBG_CRIT_FAILURE, ("error resolving keytab [%s], " \
                                    "not verifying TGT.\n", kr->keytab));
        return kerr;
    }

    memset(&cursor, 0, sizeof(cursor));
    kerr = krb5_kt_start_seq_get(kr->ctx, keytab, &cursor);
    if (kerr != 0) {
        DEBUG(SSSDBG_CRIT_FAILURE, ("error reading keytab [%s], " \
                                    "not verifying TGT.\n", kr->keytab));
        return kerr;
    }

    /* We look for the first entry from our realm or take the last one */
    memset(&entry, 0, sizeof(entry));
    while ((kt_err = krb5_kt_next_entry(kr->ctx, keytab, &entry, &cursor)) == 0) {
        if (validation_princ != NULL) {
            krb5_free_principal(kr->ctx, validation_princ);
            validation_princ = NULL;
        }
        kerr = krb5_copy_principal(kr->ctx, entry.principal,
                                   &validation_princ);
        if (kerr != 0) {
            DEBUG(SSSDBG_CRIT_FAILURE, ("krb5_copy_principal failed.\n"));
            goto done;
        }

        kerr = sss_krb5_free_keytab_entry_contents(kr->ctx, &entry);
        if (kerr != 0) {
            DEBUG(SSSDBG_MINOR_FAILURE, ("Failed to free keytab entry.\n"));
        }
        memset(&entry, 0, sizeof(entry));

        if (krb5_realm_compare(kr->ctx, validation_princ, kr->creds->client)) {
            DEBUG(SSSDBG_TRACE_INTERNAL,
                  ("Found keytab entry with the realm of the credential.\n"));
            realm_entry_found = true;
            break;
        }
    }

    if (!realm_entry_found) {
        DEBUG(SSSDBG_TRACE_INTERNAL,
                ("Keytab entry with the realm of the credential not found "
                 "in keytab. Using the last entry.\n"));
    }

    /* Close the keytab here.  Even though we're using cursors, the file
     * handle is stored in the krb5_keytab structure, and it gets
     * overwritten when the verify_init_creds() call below creates its own
     * cursor, creating a leak. */
    kerr = krb5_kt_end_seq_get(kr->ctx, keytab, &cursor);
    if (kerr != 0) {
        DEBUG(SSSDBG_CRIT_FAILURE, ("krb5_kt_end_seq_get failed, " \
                                    "not verifying TGT.\n"));
        goto done;
    }

    /* check if we got any errors from krb5_kt_next_entry */
    if (kt_err != 0 && kt_err != KRB5_KT_END) {
        DEBUG(SSSDBG_CRIT_FAILURE, ("error reading keytab [%s], " \
                                    "not verifying TGT.\n", kr->keytab));
        goto done;
    }

    /* Get the principal to which the key belongs, for logging purposes. */
    principal = NULL;
    kerr = krb5_unparse_name(kr->ctx, validation_princ, &principal);
    if (kerr != 0) {
        DEBUG(SSSDBG_CRIT_FAILURE, ("internal error parsing principal name, "
                                    "not verifying TGT.\n"));
        KRB5_CHILD_DEBUG(SSSDBG_CRIT_FAILURE, kerr);
        goto done;
    }


    krb5_verify_init_creds_opt_init(&opt);
    kerr = krb5_verify_init_creds(kr->ctx, kr->creds, validation_princ, keytab,
                                  &validation_ccache, &opt);

    if (kerr == 0) {
        DEBUG(SSSDBG_TRACE_FUNC, ("TGT verified using key for [%s].\n",
                                  principal));
    } else {
        DEBUG(SSSDBG_CRIT_FAILURE ,("TGT failed verification using key " \
                                    "for [%s].\n", principal));
        goto done;
    }

    /* Try to find and send the PAC to the PAC responder.
     * Failures are not critical. */
    if (kr->send_pac) {
        kerr = sss_extract_pac(kr->ctx, validation_ccache, validation_princ,
                               kr->creds->client, keytab, &pac_authdata);
        if (kerr != 0) {
            DEBUG(SSSDBG_OP_FAILURE, ("sss_extract_and_send_pac failed, group " \
                                      "membership for user with principal [%s] " \
                                      "might not be correct.\n", kr->name));
            kerr = 0;
            goto done;
        }

        kerr = sss_send_pac(pac_authdata);
        krb5_free_authdata(kr->ctx, pac_authdata);
        if (kerr != 0) {
            DEBUG(SSSDBG_OP_FAILURE, ("sss_send_pac failed, group " \
                                      "membership for user with principal [%s] " \
                                      "might not be correct.\n", kr->name));
            kerr = 0;
        }
    }

done:
    if (validation_ccache != NULL) {
        krb5_cc_destroy(kr->ctx, validation_ccache);
    }

    if (krb5_kt_close(kr->ctx, keytab) != 0) {
        DEBUG(SSSDBG_MINOR_FAILURE, ("krb5_kt_close failed"));
    }
    if (validation_princ != NULL) {
        krb5_free_principal(kr->ctx, validation_princ);
    }
    if (principal != NULL) {
        sss_krb5_free_unparsed_name(kr->ctx, principal);
    }

    return kerr;

}

static void krb5_set_canonicalize(krb5_get_init_creds_opt *opts)
{
    int canonicalize = 0;
    char *tmp_str;

    tmp_str = getenv(SSSD_KRB5_CANONICALIZE);
    if (tmp_str != NULL && strcasecmp(tmp_str, "true") == 0) {
        canonicalize = 1;
    }
    DEBUG(SSSDBG_CONF_SETTINGS, ("%s is set to [%s]\n",
          SSSD_KRB5_CANONICALIZE, tmp_str ? tmp_str : "not set"));
    sss_krb5_get_init_creds_opt_set_canonicalize(opts, canonicalize);
}

static krb5_error_code get_and_save_tgt_with_keytab(krb5_context ctx,
                                                    krb5_principal princ,
                                                    krb5_keytab keytab,
                                                    char *ccname)
{
    krb5_error_code kerr = 0;
    krb5_creds creds;
    krb5_get_init_creds_opt options;

    memset(&creds, 0, sizeof(creds));
    memset(&options, 0, sizeof(options));

    krb5_get_init_creds_opt_set_address_list(&options, NULL);
    krb5_get_init_creds_opt_set_forwardable(&options, 0);
    krb5_get_init_creds_opt_set_proxiable(&options, 0);
    krb5_set_canonicalize(&options);

    kerr = krb5_get_init_creds_keytab(ctx, &creds, princ, keytab, 0, NULL,
                                      &options);
    if (kerr != 0) {
        KRB5_CHILD_DEBUG(SSSDBG_CRIT_FAILURE, kerr);
        return kerr;
    }

    /* Use the updated principal in the creds in case canonicalized */
    kerr = create_ccache(ccname, &creds);
    if (kerr != 0) {
        KRB5_CHILD_DEBUG(SSSDBG_CRIT_FAILURE, kerr);
        goto done;
    }
    kerr = 0;

done:
    krb5_free_cred_contents(ctx, &creds);

    return kerr;

}

static krb5_error_code get_and_save_tgt(struct krb5_req *kr,
                                        const char *password)
{
    const char *realm_name;
    int realm_length;
    krb5_error_code kerr;
    char *cc_name;
    krb5_principal principal;

    kerr = sss_krb5_get_init_creds_opt_set_expire_callback(kr->ctx, kr->options,
                                                  sss_krb5_expire_callback_func,
                                                  kr);
    if (kerr != 0) {
        KRB5_CHILD_DEBUG(SSSDBG_CRIT_FAILURE, kerr);
        DEBUG(1, ("Failed to set expire callback, continue without.\n"));
    }

    sss_krb5_princ_realm(kr->ctx, kr->princ, &realm_name, &realm_length);

    DEBUG(SSSDBG_TRACE_FUNC,
          ("Attempting kinit for realm [%s]\n",realm_name));
    kerr = krb5_get_init_creds_password(kr->ctx, kr->creds, kr->princ,
                                        discard_const(password),
                                        sss_krb5_prompter, kr, 0,
                                        NULL, kr->options);
    if (kerr != 0) {
        KRB5_CHILD_DEBUG(SSSDBG_CRIT_FAILURE, kerr);
        return kerr;
    }

    if (kr->validate) {
        kerr = validate_tgt(kr);
        if (kerr != 0) {
            KRB5_CHILD_DEBUG(SSSDBG_CRIT_FAILURE, kerr);
            return kerr;
        }

    } else {
        DEBUG(SSSDBG_CONF_SETTINGS, ("TGT validation is disabled.\n"));
    }

    if (kr->validate || kr->fast_ccname != NULL) {
        /* We drop root privileges which were needed to read the keytab file
         * for the validation of the credentials or for FAST here to run the
         * ccache I/O operations with user privileges. */
        kerr = become_user(kr->uid, kr->gid);
        if (kerr != 0) {
            DEBUG(1, ("become_user failed.\n"));
            return kerr;
        }
    }

    principal = kr->creds ? kr->creds->client : kr->princ;

    /* If kr->ccname is cache collection (DIR:/...), we want to work
     * directly with file ccache (DIR::/...), but cache collection
     * should be returned back to back end.
     */
    cc_name = sss_get_ccache_name_for_principal(kr->pd, kr->ctx, principal,
                                                kr->ccname);
    if (cc_name == NULL) {
        cc_name = kr->ccname;
    }

    /* Use the updated principal in the creds in case canonicalized */
    kerr = create_ccache(cc_name, kr->creds);
    if (kerr != 0) {
        KRB5_CHILD_DEBUG(SSSDBG_CRIT_FAILURE, kerr);
        goto done;
    }

    kerr = add_ticket_times_and_upn_to_response(kr);
    if (kerr != 0) {
        DEBUG(1, ("add_ticket_times_and_upn_to_response failed.\n"));
    }

    kerr = 0;

done:
    krb5_free_cred_contents(kr->ctx, kr->creds);

    return kerr;

}

static errno_t map_krb5_error(krb5_error_code kerr)
{
    if (kerr != 0) {
        KRB5_CHILD_DEBUG(SSSDBG_CRIT_FAILURE, kerr);
    }

    switch (kerr) {
    case 0:
        return ERR_OK;

    case KRB5_LIBOS_CANTREADPWD:
        return ERR_NO_CREDS;

    case KRB5_KDC_UNREACH:
    case KRB5_REALM_CANT_RESOLVE:
        return ERR_NETWORK_IO;

    case KRB5KDC_ERR_CLIENT_REVOKED:
        return ERR_ACCOUNT_EXPIRED;

    case KRB5KDC_ERR_KEY_EXP:
        return ERR_CREDS_EXPIRED;

    case KRB5KRB_AP_ERR_BAD_INTEGRITY:
        return ERR_AUTH_FAILED;

    case KRB5_PREAUTH_FAILED:
    case KRB5KDC_ERR_PREAUTH_FAILED:
        return ERR_CREDS_INVALID;

    default:
        return ERR_INTERNAL;
    }
}

static errno_t changepw_child(struct krb5_req *kr, bool prelim)
{
    int ret;
    krb5_error_code kerr = 0;
    const char *password = NULL;
    const char *newpassword = NULL;
    int result_code = -1;
    krb5_data result_code_string;
    krb5_data result_string;
    char *user_error_message = NULL;
    size_t user_resp_len;
    uint8_t *user_resp;
    krb5_prompter_fct prompter = NULL;
    const char *realm_name;
    int realm_length;
    krb5_get_init_creds_opt *chagepw_options;
    size_t msg_len;
    uint8_t *msg;

    DEBUG(SSSDBG_TRACE_LIBS, ("Password change operation\n"));

    ret = sss_authtok_get_password(kr->pd->authtok, &password, NULL);
    if (ret != EOK) {
        DEBUG(1, ("Failed to fetch current password [%d] %s.\n",
                  ret, strerror(ret)));
        return ERR_NO_CREDS;
    }

    if (!prelim) {
        /* We do not need a password expiration warning here. */
        prompter = sss_krb5_prompter;
    }

    kerr = get_changepw_options(kr->ctx, &chagepw_options);
    if (kerr != 0) {
        DEBUG(SSSDBG_OP_FAILURE, ("get_changepw_options failed.\n"));
        return kerr;
    }

    sss_krb5_princ_realm(kr->ctx, kr->princ, &realm_name, &realm_length);

    DEBUG(SSSDBG_TRACE_FUNC,
          ("Attempting kinit for realm [%s]\n",realm_name));
    kerr = krb5_get_init_creds_password(kr->ctx, kr->creds, kr->princ,
                                        discard_const(password),
                                        prompter, kr, 0,
                                        SSSD_KRB5_CHANGEPW_PRINCIPAL,
                                        chagepw_options);
    sss_krb5_get_init_creds_opt_free(kr->ctx, chagepw_options);
    if (kerr != 0) {
        ret = pack_user_info_chpass_error(kr->pd, "Old password not accepted.",
                                          &msg_len, &msg);
        if (ret != EOK) {
            DEBUG(SSSDBG_CRIT_FAILURE,
                  ("pack_user_info_chpass_error failed.\n"));
        } else {
            ret = pam_add_response(kr->pd, SSS_PAM_USER_INFO, msg_len,
                                   msg);
            if (ret != EOK) {
                DEBUG(SSSDBG_CRIT_FAILURE,
                      ("pam_add_response failed.\n"));
            }
        }
        return kerr;
    }

    sss_authtok_set_empty(kr->pd->authtok);

    if (prelim) {
        DEBUG(SSSDBG_TRACE_LIBS,
              ("Initial authentication for change password operation "
               "successful.\n"));
        krb5_free_cred_contents(kr->ctx, kr->creds);
        return EOK;
    }

    ret = sss_authtok_get_password(kr->pd->newauthtok, &newpassword, NULL);
    if (ret != EOK) {
        DEBUG(1, ("Failed to fetch new password [%d] %s.\n",
                  ret, strerror(ret)));
        return ERR_NO_CREDS;
    }

    memset(&result_code_string, 0, sizeof(krb5_data));
    memset(&result_string, 0, sizeof(krb5_data));
    kerr = krb5_change_password(kr->ctx, kr->creds,
                                discard_const(newpassword), &result_code,
                                &result_code_string, &result_string);

    if (kerr == KRB5_KDC_UNREACH) {
        return ERR_NETWORK_IO;
    }

    if (kerr != 0 || result_code != 0) {
        if (kerr != 0) {
            KRB5_CHILD_DEBUG(SSSDBG_CRIT_FAILURE, kerr);
        }

        if (result_code_string.length > 0) {
            DEBUG(1, ("krb5_change_password failed [%d][%.*s].\n", result_code,
                      result_code_string.length, result_code_string.data));
            user_error_message = talloc_strndup(kr->pd, result_code_string.data,
                                                result_code_string.length);
            if (user_error_message == NULL) {
                DEBUG(1, ("talloc_strndup failed.\n"));
            }
        }

        if (result_string.length > 0 && result_string.data[0] != '\0') {
            DEBUG(1, ("krb5_change_password failed [%d][%.*s].\n", result_code,
                      result_string.length, result_string.data));
            talloc_free(user_error_message);
            user_error_message = talloc_strndup(kr->pd, result_string.data,
                                                result_string.length);
            if (user_error_message == NULL) {
                DEBUG(1, ("talloc_strndup failed.\n"));
            }
        } else if (result_code == KRB5_KPASSWD_SOFTERROR) {
            user_error_message = talloc_strdup(kr->pd, "Please make sure the "
                                 "password meets the complexity constraints.");
            if (user_error_message == NULL) {
                DEBUG(SSSDBG_CRIT_FAILURE, ("talloc_strndup failed.\n"));
            }
        }

        if (user_error_message != NULL) {
            ret = pack_user_info_chpass_error(kr->pd, user_error_message,
                                              &user_resp_len, &user_resp);
            if (ret != EOK) {
                DEBUG(1, ("pack_user_info_chpass_error failed.\n"));
            } else {
                ret = pam_add_response(kr->pd, SSS_PAM_USER_INFO, user_resp_len,
                                       user_resp);
                if (ret != EOK) {
                    DEBUG(1, ("pack_response_packet failed.\n"));
                }
            }
        }

        return ERR_CHPASS_FAILED;
    }

    krb5_free_cred_contents(kr->ctx, kr->creds);

    kerr = get_and_save_tgt(kr, newpassword);

    sss_authtok_set_empty(kr->pd->newauthtok);

    if (kerr == 0) {
        kerr = k5c_attach_ccname_msg(kr);
    }
    return map_krb5_error(kerr);
}

static errno_t tgt_req_child(struct krb5_req *kr)
{
    krb5_get_init_creds_opt *chagepw_options;
    const char *password = NULL;
    krb5_error_code kerr;
    int ret;

    DEBUG(SSSDBG_TRACE_LIBS, ("Attempting to get a TGT\n"));

    ret = sss_authtok_get_password(kr->pd->authtok, &password, NULL);
    switch (ret) {
        case EOK:
            break;

        case EACCES:
            DEBUG(SSSDBG_OP_FAILURE, ("Invalid authtok type\n"));
            return ERR_INVALID_CRED_TYPE;
            break;

        default:
            DEBUG(SSSDBG_OP_FAILURE, ("No credentials available\n"));
            return ERR_NO_CREDS;
            break;
    }