Add simple access provider

2 files changed, 196 insertions, 0 deletions

diff --git a/src/providers/simple/simple_access.c b/src/providers/simple/simple_access.c
new file mode 100644
index 00000000..4d6135fa
--- /dev/null
+++ b/src/providers/simple/simple_access.c
@@ -0,0 +1,160 @@
+/*
+   SSSD
+
+   Simple access control
+
+   Copyright (C) Sumit Bose <sbose@redhat.com> 2010
+
+   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 <security/pam_modules.h>
+
+#include "util/util.h"
+#include "providers/dp_backend.h"
+#include "db/sysdb.h"
+#include "providers/simple/simple_access.h"
+
+#define CONFDB_SIMPLE_ALLOW_USERS "simple_allow_users"
+#define CONFDB_SIMPLE_DENY_USERS "simple_deny_users"
+
+errno_t simple_access_check(struct simple_ctx *ctx, const char *username,
+                            bool *access_granted)
+{
+    int i;
+
+    *access_granted = false;
+    if (ctx->allow_users != NULL) {
+        for(i = 0; ctx->allow_users[i] != NULL; i++) {
+            if (strcmp(username, ctx->allow_users[i]) == 0) {
+                DEBUG(9, ("User [%s] found in allow list, access granted.\n",
+                      username));
+                *access_granted = true;
+                return EOK;
+            }
+        }
+    } else {
+        *access_granted = true;
+        if (ctx->deny_users != NULL) {
+            for(i = 0; ctx->deny_users[i] != NULL; i++) {
+                if (strcmp(username, ctx->deny_users[i]) == 0) {
+                    DEBUG(9, ("User [%s] found in deny list, access denied.\n",
+                          username));
+                    *access_granted = false;
+                    return EOK;
+                }
+            }
+        }
+    }
+
+    return EOK;
+}
+
+void simple_access_handler(struct be_req *be_req)
+{
+    int ret;
+    bool access_granted = false;
+    struct pam_data *pd;
+    struct simple_ctx *ctx;
+
+    pd = talloc_get_type(be_req->req_data, struct pam_data);
+
+    pd->pam_status = PAM_SYSTEM_ERR;
+
+    if (pd->cmd != SSS_PAM_ACCT_MGMT) {
+        DEBUG(4, ("simple access does not handles pam task %d.\n", pd->cmd));
+        pd->pam_status = PAM_MODULE_UNKNOWN;
+        goto done;
+    }
+
+    ctx = talloc_get_type(be_req->be_ctx->bet_info[BET_ACCESS].pvt_bet_data,
+                          struct simple_ctx);
+
+    ret = simple_access_check(ctx, pd->user, &access_granted);
+    if (ret != EOK) {
+        pd->pam_status = PAM_SYSTEM_ERR;
+        goto done;
+    }
+
+    if (access_granted) {
+        pd->pam_status = PAM_SUCCESS;
+    } else {
+        pd->pam_status = PAM_PERM_DENIED;
+    }
+
+done:
+    be_req->fn(be_req, DP_ERR_OK, pd->pam_status, NULL);
+}
+
+struct bet_ops simple_access_ops = {
+    .handler = simple_access_handler,
+    .finalize = NULL
+};
+
+int sssm_simple_access_init(struct be_ctx *bectx, struct bet_ops **ops,
+                            void **pvt_data)
+{
+    int ret = EINVAL;
+    struct simple_ctx *ctx;
+
+    ctx = talloc_zero(bectx, struct simple_ctx);
+    if (ctx == NULL) {
+        DEBUG(1, ("talloc_zero failed.\n"));
+        return ENOMEM;
+    }
+
+    ret = confdb_get_string_as_list(bectx->cdb, ctx, bectx->conf_path,
+                                    CONFDB_SIMPLE_ALLOW_USERS,
+                                    &ctx->allow_users);
+    if (ret != EOK) {
+        if (ret == ENOENT) {
+            DEBUG(9, ("Allow user list is empty.\n"));
+            ctx->allow_users = NULL;
+        } else {
+            DEBUG(1, ("confdb_get_string_as_list failed.\n"));
+            goto failed;
+        }
+    }
+
+    ret = confdb_get_string_as_list(bectx->cdb, ctx, bectx->conf_path,
+                                    CONFDB_SIMPLE_DENY_USERS,
+                                    &ctx->deny_users);
+    if (ret != EOK) {
+        if (ret == ENOENT) {
+            DEBUG(9, ("Deny user list is empty.\n"));
+            ctx->deny_users = NULL;
+        } else {
+            DEBUG(1, ("confdb_get_string_as_list failed.\n"));
+            goto failed;
+        }
+    }
+
+    if (ctx->allow_users != NULL && ctx->deny_users != NULL) {
+        DEBUG(1, ("Access and deny list are defined, only one is allowed.\n"));
+        ret = EINVAL;
+        goto failed;
+    }
+
+
+    *ops = &simple_access_ops;
+    *pvt_data = ctx;
+
+    return EOK;
+
+failed:
+    talloc_free(ctx);
+    return ret;
+}
diff --git a/src/providers/simple/simple_access.h b/src/providers/simple/simple_access.h
new file mode 100644
index 00000000..0aac42a5
--- /dev/null
+++ b/src/providers/simple/simple_access.h
@@ -0,0 +1,36 @@
+/*
+   SSSD
+
+   Simple access control
+
+   Copyright (C) Sumit Bose <sbose@redhat.com> 2010
+
+   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/>.
+*/
+
+#ifndef __SIMPLE_ACCESS_H__
+#define __SIMPLE_ACCESS_H__
+
+#include <stdlib.h>
+
+#include "util/util.h"
+
+struct simple_ctx {
+    char **allow_users;
+    char **deny_users;
+};
+
+errno_t simple_access_check(struct simple_ctx *ctx, const char *username,
+                            bool *access_granted);
+#endif /* __SIMPLE_ACCESS_H__ */