diff options
Diffstat (limited to 'sechecker/modules/find_node_types.c')
| -rw-r--r-- | sechecker/modules/find_node_types.c | 479 |
1 files changed, 479 insertions, 0 deletions
diff --git a/sechecker/modules/find_node_types.c b/sechecker/modules/find_node_types.c new file mode 100644 index 0000000..f10be10 --- /dev/null +++ b/sechecker/modules/find_node_types.c @@ -0,0 +1,479 @@ +/** + * @file + * Implementation of the node types utility module. + * + * @author Kevin Carr kcarr@tresys.com + * @author Jeremy A. Mowery jmowery@tresys.com + * @author Jason Tang jtang@tresys.com + * @author David Windsor dwindsor@tresys.com + * + * Copyright (C) 2005-2007 Tresys Technology, LLC + * + * 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 2 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, write to the Free Software + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA + */ + +#include "find_node_types.h" +#include <apol/netcon-query.h> + +#include <stdio.h> +#include <string.h> +#include <errno.h> + +static const char *const mod_name = "find_node_types"; + +/* The register function registers all of a module's functions + * with the library. You should not need to edit this function + * unless you are adding additional functions you need other modules + * to call. See the note at the bottom of this function to do so. */ +int find_node_types_register(sechk_lib_t * lib) +{ + sechk_module_t *mod = NULL; + sechk_fn_t *fn_struct = NULL; + + if (!lib) { + ERR(NULL, "%s", "No library"); + errno = EINVAL; + return -1; + } + + mod = sechk_lib_get_module(mod_name, lib); + if (!mod) { + ERR(NULL, "%s", "Unknown module"); + errno = EINVAL; + return -1; + } + mod->parent_lib = lib; + + /* Modules are declared by the config file and their name and options + * are stored in the module array. The name is looked up to determine + * where to store the function structures */ + + /* assign the descriptions */ + mod->brief_description = "utility module"; + mod->detailed_description = + "--------------------------------------------------------------------------------\n" + "This module finds all types in a policy treated as a node type. A type is\n" + "considered a node type if it is used in the context of a nodecon statement or\n" + "the context of the node initial sid.\n"; + mod->opt_description = + " Module requirements:\n" " none\n" " Module dependencies:\n" " none\n" " Module options:\n" " none\n"; + mod->severity = SECHK_SEV_NONE; + + /* register functions */ + fn_struct = sechk_fn_new(); + if (!fn_struct) { + ERR(NULL, "%s", strerror(ENOMEM)); + errno = ENOMEM; + return -1; + } + fn_struct->name = strdup(SECHK_MOD_FN_INIT); + if (!fn_struct->name) { + ERR(NULL, "%s", strerror(ENOMEM)); + errno = ENOMEM; + return -1; + } + fn_struct->fn = find_node_types_init; + apol_vector_append(mod->functions, (void *)fn_struct); + + fn_struct = sechk_fn_new(); + if (!fn_struct) { + ERR(NULL, "%s", strerror(ENOMEM)); + errno = ENOMEM; + return -1; + } + fn_struct->name = strdup(SECHK_MOD_FN_RUN); + if (!fn_struct->name) { + ERR(NULL, "%s", strerror(ENOMEM)); + errno = ENOMEM; + return -1; + } + fn_struct->fn = find_node_types_run; + apol_vector_append(mod->functions, (void *)fn_struct); + + mod->data_free = NULL; + + fn_struct = sechk_fn_new(); + if (!fn_struct) { + ERR(NULL, "%s", strerror(ENOMEM)); + errno = ENOMEM; + return -1; + } + fn_struct->name = strdup(SECHK_MOD_FN_PRINT); + if (!fn_struct->name) { + ERR(NULL, "%s", strerror(ENOMEM)); + errno = ENOMEM; + return -1; + } + fn_struct->fn = find_node_types_print; + apol_vector_append(mod->functions, (void *)fn_struct); + + fn_struct = sechk_fn_new(); + if (!fn_struct) { + ERR(NULL, "%s", strerror(ENOMEM)); + errno = ENOMEM; + return -1; + } + fn_struct->name = strdup("get_list"); + if (!fn_struct->name) { + ERR(NULL, "%s", strerror(ENOMEM)); + errno = ENOMEM; + return -1; + } + fn_struct->fn = find_node_types_get_list; + apol_vector_append(mod->functions, (void *)fn_struct); + + return 0; +} + +/* The init function creates the module's private data storage object + * and initializes its values based on the options parsed in the config + * file. + * Add any option processing logic as indicated below. */ +int find_node_types_init(sechk_module_t * mod, apol_policy_t * policy, void *arg __attribute__ ((unused))) +{ + if (!mod || !policy) { + ERR(policy, "%s", "Invalid parameters"); + errno = EINVAL; + return -1; + } + if (strcmp(mod_name, mod->name)) { + ERR(policy, "Wrong module (%s)", mod->name); + errno = EINVAL; + return -1; + } + + return 0; +} + +/* The run function performs the check. This function runs only once + * even if called multiple times. All test logic should be placed below + * as instructed. This function allocates the result structure and fills + * in all relavant item and proof data. + * Return Values: + * -1 System error + * 0 The module "succeeded" - no negative results found + * 1 The module "failed" - some negative results found */ +int find_node_types_run(sechk_module_t * mod, apol_policy_t * policy, void *arg __attribute__ ((unused))) +{ + sechk_result_t *res = NULL; + sechk_item_t *item = NULL; + sechk_proof_t *proof = NULL; + char *buff = NULL; + size_t i, buff_sz = 0; + apol_vector_t *nodecon_vector = NULL; + qpol_policy_t *q = apol_policy_get_qpol(policy); + int error = 0; + + if (!mod || !policy) { + ERR(policy, "%s", "Invalid parameters"); + errno = EINVAL; + return -1; + } + if (strcmp(mod_name, mod->name)) { + ERR(policy, "Wrong module (%s)", mod->name); + errno = EINVAL; + return -1; + } + + /* if already run return */ + if (mod->result) + return 0; + + res = sechk_result_new(); + if (!res) { + ERR(policy, "%s", strerror(ENOMEM)); + errno = ENOMEM; + return -1; + } + res->test_name = strdup(mod_name); + if (!res->test_name) { + error = errno; + ERR(policy, "%s", strerror(ENOMEM)); + goto find_node_types_run_fail; + } + res->item_type = SECHK_ITEM_TYPE; + if (!(res->items = apol_vector_create(sechk_item_free))) { + error = errno; + ERR(policy, "%s", strerror(ENOMEM)); + goto find_node_types_run_fail; + } + + /* search initial SIDs */ + const qpol_isid_t *isid = NULL; + + buff = NULL; + qpol_policy_get_isid_by_name(q, "node", &isid); + if (isid) { + const qpol_context_t *context; + apol_context_t *a_context; + const qpol_type_t *context_type; + const char *context_type_name; + char *tmp; + + proof = NULL; + qpol_isid_get_context(q, isid, &context); + qpol_context_get_type(q, context, &context_type); + qpol_type_get_name(q, context_type, &context_type_name); + a_context = apol_context_create_from_qpol_context(policy, context); + + if (apol_str_append(&buff, &buff_sz, "sid node ") != 0) { + error = errno; + ERR(policy, "%s", strerror(ENOMEM)); + apol_context_destroy(&a_context); + goto find_node_types_run_fail; + } + + tmp = apol_context_render(policy, a_context); + if (apol_str_append(&buff, &buff_sz, tmp) != 0) { + error = errno; + ERR(policy, "%s", strerror(ENOMEM)); + apol_context_destroy(&a_context); + free(tmp); + goto find_node_types_run_fail; + } + apol_context_destroy(&a_context); + free(tmp); + tmp = NULL; + + if (!item) { + item = sechk_item_new(NULL); + if (!item) { + error = errno; + ERR(policy, "%s", strerror(ENOMEM)); + goto find_node_types_run_fail; + } + item->test_result = 1; + } + + proof = sechk_proof_new(NULL); + if (!proof) { + error = errno; + ERR(policy, "%s", strerror(ENOMEM)); + goto find_node_types_run_fail; + } + + proof->type = SECHK_ITEM_ISID; + proof->elem = (void *)isid; + proof->text = buff; + + item->item = (void *)context_type; + if (!item->proof) { + if (!(item->proof = apol_vector_create(sechk_proof_free))) { + error = errno; + ERR(policy, "%s", strerror(ENOMEM)); + goto find_node_types_run_fail; + } + } + if (apol_vector_append(item->proof, (void *)proof) < 0) { + error = errno; + ERR(policy, "%s", strerror(ENOMEM)); + goto find_node_types_run_fail; + } + if (apol_vector_append(res->items, (void *)item) < 0) { + error = errno; + ERR(policy, "%s", strerror(ENOMEM)); + goto find_node_types_run_fail; + } + } + + if (apol_nodecon_get_by_query(policy, NULL, &nodecon_vector) < 0) { + error = errno; + goto find_node_types_run_fail; + } + + for (i = 0; i < apol_vector_get_size(nodecon_vector); i++) { + const char *type_name; + size_t j; + const qpol_context_t *context; + const qpol_type_t *context_type; + qpol_nodecon_t *nodecon = apol_vector_get_element(nodecon_vector, i); + qpol_nodecon_get_context(q, nodecon, &context); + qpol_context_get_type(q, context, &context_type); + qpol_type_get_name(q, context_type, &type_name); + + proof = sechk_proof_new(NULL); + if (!proof) { + error = errno; + ERR(policy, "%s", strerror(ENOMEM)); + goto find_node_types_run_fail; + } + proof->type = SECHK_ITEM_NONE; + proof->text = apol_nodecon_render(policy, nodecon); + + for (j = 0; j < apol_vector_get_size(res->items); j++) { + sechk_item_t *res_item; + const qpol_type_t *res_type; + const char *res_type_name; + + res_item = apol_vector_get_element(res->items, j); + res_type = res_item->item; + qpol_type_get_name(q, res_type, &res_type_name); + if (!strcmp(res_type_name, type_name)) + item = res_item; + } + if (!item) { + item = sechk_item_new(NULL); + if (!item) { + error = errno; + ERR(policy, "%s", strerror(ENOMEM)); + goto find_node_types_run_fail; + } + item->test_result = 1; + item->item = (void *)context_type; + if (apol_vector_append(res->items, (void *)item) < 0) { + error = errno; + ERR(policy, "%s", strerror(ENOMEM)); + goto find_node_types_run_fail; + } + } + if (!item->proof) { + if (!(item->proof = apol_vector_create(sechk_proof_free))) { + error = errno; + ERR(policy, "%s", strerror(ENOMEM)); + goto find_node_types_run_fail; + } + } + if (apol_vector_append(item->proof, (void *)proof) < 0) { + error = errno; + ERR(policy, "%s", strerror(ENOMEM)); + goto find_node_types_run_fail; + } + item = NULL; + } + apol_vector_destroy(&nodecon_vector); + + mod->result = res; + + return 0; + + find_node_types_run_fail: + apol_vector_destroy(&nodecon_vector); + sechk_proof_free(proof); + sechk_item_free(item); + free(buff); + sechk_result_destroy(&res); + errno = error; + return -1; +} + +/* The print function generates the text and prints the results to stdout. */ +int find_node_types_print(sechk_module_t * mod, apol_policy_t * policy, void *arg __attribute((unused))) +{ + unsigned char outformat = 0x00; + sechk_item_t *item = NULL; + sechk_proof_t *proof = NULL; + size_t i = 0, j = 0, k = 0, num_items = 0; + const qpol_type_t *type; + qpol_policy_t *q = apol_policy_get_qpol(policy); + const char *type_name; + + if (!mod || !policy) { + ERR(policy, "%s", "Invalid parameters"); + errno = EINVAL; + return -1; + } + if (strcmp(mod_name, mod->name)) { + ERR(policy, "Wrong module (%s)", mod->name); + errno = EINVAL; + return -1; + } + + outformat = mod->outputformat; + + num_items = apol_vector_get_size(mod->result->items); + + if (!mod->result) { + ERR(policy, "%s", "Module has not been run"); + errno = EINVAL; + return -1; + } + + if (!outformat || (outformat & SECHK_OUT_QUIET)) + return 0; /* not an error - no output is requested */ + + if (outformat & SECHK_OUT_STATS) { + printf("Found %i node types.\n", num_items); + } + + /* The list renode component is a display of all items + * found without any supnodeing proof. The default method + * is to display a comma separated list four items to a line + * this may need to be changed for longer items. */ + if (outformat & SECHK_OUT_LIST) { + printf("\n"); + for (i = 0; i < num_items; i++) { + j++; + j %= 4; + item = apol_vector_get_element(mod->result->items, i); + type = (qpol_type_t *) item->item; + qpol_type_get_name(q, type, &type_name); + printf("%s%s", type_name, (char *)((j && i != num_items - 1) ? ", " : "\n")); + } + printf("\n"); + } + + /* The proof renode component is a display of a list of items + * with an indented list of proof statements supnodeing the result + * of the check for that item (e.g. rules with a given type) + * this field also lists the computed severity of each item + * (see sechk_item_sev in sechecker.c for details on calculation) + * items are printed on a line either with (or, if long, such as a + * rule, followed by) the severity. Each proof element is then + * displayed in an indented list one per line below it. */ + if (outformat & SECHK_OUT_PROOF) { + printf("\n"); + for (j = 0; j < num_items; j++) { + item = apol_vector_get_element(mod->result->items, j); + type = (qpol_type_t *) item->item; + qpol_type_get_name(q, type, &type_name); + if (item) { + printf("%s\n", type_name); + for (k = 0; k < apol_vector_get_size(item->proof); k++) { + proof = apol_vector_get_element(item->proof, k); + if (proof) + printf("\t%s\n", proof->text); + } + } + } + printf("\n"); + } + + return 0; +} + +int find_node_types_get_list(sechk_module_t * mod, apol_policy_t * policy __attribute__ ((unused)), void *arg) +{ + apol_vector_t **v = arg; + + if (!mod || !arg) { + ERR(NULL, "%s", "Invalid parameters"); + errno = EINVAL; + return -1; + } + if (strcmp(mod_name, mod->name)) { + ERR(NULL, "Wrong module (%s)", mod->name); + errno = EINVAL; + return -1; + } + if (!mod->result) { + ERR(NULL, "%s", "Module has not been run"); + errno = EINVAL; + return -1; + } + + v = &mod->result->items; + + return 0; +} |