diff options
Diffstat (limited to 'server/responder/pam/pamsrv_cache.c')
| -rw-r--r-- | server/responder/pam/pamsrv_cache.c | 275 |
1 files changed, 275 insertions, 0 deletions
diff --git a/server/responder/pam/pamsrv_cache.c b/server/responder/pam/pamsrv_cache.c new file mode 100644 index 00000000..10f41996 --- /dev/null +++ b/server/responder/pam/pamsrv_cache.c @@ -0,0 +1,275 @@ +/* + SSSD + + PAM cache credentials + + Copyright (C) Simo Sorce <ssorce@redhat.com> 2009 + Copyright (C) Sumit Bose <sbose@redhat.com> 2009 + + 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 <security/pam_modules.h> +#include <time.h> +#include "util/util.h" +#include "db/sysdb.h" +#include "util/nss_sha512crypt.h" +#include "providers/data_provider.h" +#include "responder/pam/pamsrv.h" + +static int authtok2str(const void *mem_ctx, + uint8_t *src, const int src_size, + char **_dest) +{ + char *dest; + + if ((src == NULL && src_size != 0) || + (src != NULL && *src != '\0' && src_size == 0)) { + return EINVAL; + } + + dest = talloc_size(mem_ctx, src_size + 1); + if (dest == NULL) { + return ENOMEM; + } + + memcpy(dest, src, src_size); + dest[src_size]='\0'; + + *_dest = dest; + return EOK; +} + +struct set_attrs_ctx { + struct pam_auth_req *preq; + struct sysdb_attrs *attrs; + struct sysdb_req *sysreq; +}; + +static void pc_set_user_attr_callback(void *pvt, + int ldb_status, + struct ldb_result *res) +{ + struct set_attrs_ctx *ctx; + int error; + + ctx = talloc_get_type(pvt, struct set_attrs_ctx); + error = sysdb_error_to_errno(ldb_status); + + sysdb_transaction_done(ctx->sysreq, error); + + if (ldb_status != LDB_SUCCESS) { + DEBUG(2, ("Failed to cache credentials for user [%s] (%d)!\n", + ctx->preq->pd->user, error, strerror(error))); + } + + ctx->preq->callback(ctx->preq); +} + +static void pc_set_user_attr_req(struct sysdb_req *req, void *pvt) +{ + struct set_attrs_ctx *ctx; + int ret; + + DEBUG(4, ("entering pc_set_user_attr_req\n")); + + ctx = talloc_get_type(pvt, struct set_attrs_ctx); + + ctx->sysreq = req; + + ret = sysdb_set_user_attr(req, ctx->preq->cctx->rctx->sysdb, + ctx->preq->domain, + ctx->preq->pd->user, + ctx->attrs, + pc_set_user_attr_callback, ctx); + if (ret != EOK) { + sysdb_transaction_done(ctx->sysreq, ret); + } + + if (ret != EOK) { + DEBUG(2, ("Failed to cache credentials for user [%s] (%d)!\n", + ctx->preq->pd->user, ret, strerror(ret))); + ctx->preq->callback(ctx->preq); + } +} + +int pam_cache_credentials(struct pam_auth_req *preq) +{ + struct set_attrs_ctx *ctx; + struct pam_data *pd; + char *password = NULL; + char *comphash = NULL; + char *salt; + int i, ret; + + pd = preq->pd; + + ret = authtok2str(preq, pd->authtok, pd->authtok_size, &password); + if (ret) { + DEBUG(4, ("Invalid auth token.\n")); + ret = EINVAL; + goto done; + } + + salt = gen_salt(); + if (!salt) { + DEBUG(4, ("Failed to generate random salt.\n")); + ret = EFAULT; + goto done; + } + + comphash = nss_sha512_crypt(password, salt); + if (!comphash) { + DEBUG(4, ("Failed to create password hash.\n")); + ret = EFAULT; + goto done; + } + + ctx = talloc_zero(preq, struct set_attrs_ctx); + if (!ctx) { + ret = ENOMEM; + goto done; + } + ctx->preq = preq; + + ctx->attrs = sysdb_new_attrs(ctx); + if (!ctx->attrs) { + ret = ENOMEM; + goto done; + } + + ret = sysdb_attrs_add_string(ctx->attrs, SYSDB_PWD, comphash); + if (ret) goto done; + + /* FIXME: should we use a different attribute for chache passwords ?? */ + ret = sysdb_attrs_add_long(ctx->attrs, "lastPasswordChange", + (long)time(NULL)); + if (ret) goto done; + + ret = sysdb_transaction(ctx, preq->cctx->rctx->sysdb, + pc_set_user_attr_req, ctx); + +done: + if (password) for (i = 0; password[i]; i++) password[i] = 0; + if (ret != EOK) { + DEBUG(2, ("Failed to cache credentials for user [%s] (%d)!\n", + pd->user, ret, strerror(ret))); + } + return ret; +} + +static void pam_cache_auth_return(struct pam_auth_req *preq, int error) +{ + preq->pd->pam_status = error; + preq->callback(preq); +} + +static void pam_cache_auth_callback(void *pvt, int ldb_status, + struct ldb_result *res) +{ + struct pam_auth_req *preq; + struct pam_data *pd; + const char *userhash; + const char *comphash; + char *password = NULL; + int i, ret; + + preq = talloc_get_type(pvt, struct pam_auth_req); + pd = preq->pd; + + if (ldb_status != LDB_SUCCESS) { + DEBUG(4, ("User info retireval failed! (%d [%s])\n", + ldb_status, sysdb_error_to_errno(ldb_status))); + + ret = PAM_SYSTEM_ERR; + goto done; + } + + if (res->count == 0) { + DEBUG(4, ("User [%s@%s] not found.\n", + pd->user, preq->domain->name)); + ret = PAM_USER_UNKNOWN; + goto done; + } + + if (res->count != 1) { + DEBUG(4, ("Too manyt results for user [%s@%s].\n", + pd->user, preq->domain->name)); + ret = PAM_SYSTEM_ERR; + goto done; + } + + /* TODO: verify user account (failed logins, disabled, expired ...) */ + + ret = authtok2str(preq, pd->authtok, pd->authtok_size, &password); + if (ret) { + DEBUG(4, ("Invalid auth token.\n")); + ret = PAM_AUTH_ERR; + goto done; + } + + userhash = ldb_msg_find_attr_as_string(res->msgs[0], SYSDB_PWD, NULL); + if (userhash == NULL || *userhash == '\0') { + DEBUG(4, ("Cached credentials not available.\n")); + ret = PAM_AUTHINFO_UNAVAIL; + goto done; + } + + comphash = nss_sha512_crypt(password, userhash); + if (!comphash) { + DEBUG(4, ("Failed to create password hash.\n")); + ret = PAM_SYSTEM_ERR; + goto done; + } + + if (strcmp(userhash, comphash) == 0) { + /* TODO: probable good point for audit logging */ + DEBUG(4, ("Hashes do match!\n")); + ret = PAM_SUCCESS; + goto done; + } + + DEBUG(4, ("Authentication failed.\n")); + ret = PAM_AUTH_ERR; + +done: + if (password) for (i = 0; password[i]; i++) password[i] = 0; + pam_cache_auth_return(preq, ret); +} + +int pam_cache_auth(struct pam_auth_req *preq) +{ + int ret; + + static const char *attrs[] = {SYSDB_NAME, + SYSDB_PWD, + SYSDB_DISABLED, + SYSDB_LAST_LOGIN, + "lastPasswordChange", + "accountExpires", + "failedLoginAttempts", + "lastFailedLogin", + NULL}; + + ret = sysdb_get_user_attr(preq, preq->cctx->rctx->sysdb, + preq->domain, preq->pd->user, attrs, + pam_cache_auth_callback, preq); + + if (ret != EOK) { + DEBUG(2, ("sysdb_get_user_attr failed.\n")); + } + + return ret; +} + |