-/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
-
-/***
- This file is part of systemd.
-
- Copyright 2013 Lennart Poettering
-
- systemd is free software; you can redistribute it and/or modify it
- under the terms of the GNU Lesser General Public License as published by
- the Free Software Foundation; either version 2.1 of the License, or
- (at your option) any later version.
-
- systemd 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
- Lesser General Public License for more details.
-
- You should have received a copy of the GNU Lesser General Public License
- along with systemd; If not, see <http://www.gnu.org/licenses/>.
-***/
-
-#include "xml.h"
-#include "fileio.h"
-#include "strv.h"
-#include "set.h"
-#include "conf-files.h"
-#include "bus-internal.h"
-#include "bus-xml-policy.h"
-#include "sd-login.h"
-
-static void policy_item_free(PolicyItem *i) {
- assert(i);
-
- free(i->interface);
- free(i->member);
- free(i->error);
- free(i->name);
- free(i->path);
- free(i);
-}
-
-DEFINE_TRIVIAL_CLEANUP_FUNC(PolicyItem*, policy_item_free);
-
-static void item_append(PolicyItem *i, PolicyItem **list) {
-
- PolicyItem *tail;
-
- LIST_FIND_TAIL(items, *list, tail);
- LIST_INSERT_AFTER(items, *list, tail, i);
-}
-
-static int file_load(Policy *p, const char *path) {
-
- _cleanup_free_ char *c = NULL, *policy_user = NULL, *policy_group = NULL;
- _cleanup_(policy_item_freep) PolicyItem *i = NULL;
- void *xml_state = NULL;
- unsigned n_other = 0;
- const char *q;
- int r;
-
- enum {
- STATE_OUTSIDE,
- STATE_BUSCONFIG,
- STATE_POLICY,
- STATE_POLICY_CONTEXT,
- STATE_POLICY_CONSOLE,
- STATE_POLICY_USER,
- STATE_POLICY_GROUP,
- STATE_POLICY_OTHER_ATTRIBUTE,
- STATE_ALLOW_DENY,
- STATE_ALLOW_DENY_INTERFACE,
- STATE_ALLOW_DENY_MEMBER,
- STATE_ALLOW_DENY_ERROR,
- STATE_ALLOW_DENY_PATH,
- STATE_ALLOW_DENY_MESSAGE_TYPE,
- STATE_ALLOW_DENY_NAME,
- STATE_ALLOW_DENY_OTHER_ATTRIBUTE,
- STATE_OTHER,
- } state = STATE_OUTSIDE;
-
- enum {
- POLICY_CATEGORY_NONE,
- POLICY_CATEGORY_DEFAULT,
- POLICY_CATEGORY_MANDATORY,
- POLICY_CATEGORY_ON_CONSOLE,
- POLICY_CATEGORY_NO_CONSOLE,
- POLICY_CATEGORY_USER,
- POLICY_CATEGORY_GROUP
- } policy_category = POLICY_CATEGORY_NONE;
-
- unsigned line = 0;
-
- assert(p);
-
- r = read_full_file(path, &c, NULL);
- if (r < 0) {
- if (r == -ENOENT)
- return 0;
- if (r == -EISDIR)
- return r;
-
- return log_error_errno(r, "Failed to load %s: %m", path);
- }
-
- q = c;
- for (;;) {
- _cleanup_free_ char *name = NULL;
- int t;
-
- t = xml_tokenize(&q, &name, &xml_state, &line);
- if (t < 0)
- return log_error_errno(t, "XML parse failure in %s: %m", path);
-
- switch (state) {
-
- case STATE_OUTSIDE:
-
- if (t == XML_TAG_OPEN) {
- if (streq(name, "busconfig"))
- state = STATE_BUSCONFIG;
- else {
- log_error("Unexpected tag %s at %s:%u.", name, path, line);
- return -EINVAL;
- }
-
- } else if (t == XML_END)
- return 0;
- else if (t != XML_TEXT || !in_charset(name, WHITESPACE)) {
- log_error("Unexpected token (1) at %s:%u.", path, line);
- return -EINVAL;
- }
-
- break;
-
- case STATE_BUSCONFIG:
-
- if (t == XML_TAG_OPEN) {
- if (streq(name, "policy")) {
- state = STATE_POLICY;
- policy_category = POLICY_CATEGORY_NONE;
- free(policy_user);
- free(policy_group);
- policy_user = policy_group = NULL;
- } else {
- state = STATE_OTHER;
- n_other = 0;
- }
- } else if (t == XML_TAG_CLOSE_EMPTY ||
- (t == XML_TAG_CLOSE && streq(name, "busconfig")))
- state = STATE_OUTSIDE;
- else if (t != XML_TEXT || !in_charset(name, WHITESPACE)) {
- log_error("Unexpected token (2) at %s:%u.", path, line);
- return -EINVAL;
- }
-
- break;
-
- case STATE_POLICY:
-
- if (t == XML_ATTRIBUTE_NAME) {
- if (streq(name, "context"))
- state = STATE_POLICY_CONTEXT;
- else if (streq(name, "at_console"))
- state = STATE_POLICY_CONSOLE;
- else if (streq(name, "user"))
- state = STATE_POLICY_USER;
- else if (streq(name, "group"))
- state = STATE_POLICY_GROUP;
- else {
- log_warning("Attribute %s of <policy> tag unknown at %s:%u, ignoring.", name, path, line);
- state = STATE_POLICY_OTHER_ATTRIBUTE;
- }
- } else if (t == XML_TAG_CLOSE_EMPTY ||
- (t == XML_TAG_CLOSE && streq(name, "policy")))
- state = STATE_BUSCONFIG;
- else if (t == XML_TAG_OPEN) {
- PolicyItemType it;
-
- if (streq(name, "allow"))
- it = POLICY_ITEM_ALLOW;
- else if (streq(name, "deny"))
- it = POLICY_ITEM_DENY;
- else {
- log_warning("Unknown tag %s in <policy> %s:%u.", name, path, line);
- return -EINVAL;
- }
-
- assert(!i);
- i = new0(PolicyItem, 1);
- if (!i)
- return log_oom();
-
- i->type = it;
- state = STATE_ALLOW_DENY;
-
- } else if (t != XML_TEXT || !in_charset(name, WHITESPACE)) {
- log_error("Unexpected token (3) at %s:%u.", path, line);
- return -EINVAL;
- }
-
- break;
-
- case STATE_POLICY_CONTEXT:
-
- if (t == XML_ATTRIBUTE_VALUE) {
- if (streq(name, "default")) {
- policy_category = POLICY_CATEGORY_DEFAULT;
- state = STATE_POLICY;
- } else if (streq(name, "mandatory")) {
- policy_category = POLICY_CATEGORY_MANDATORY;
- state = STATE_POLICY;
- } else {
- log_error("context= parameter %s unknown for <policy> at %s:%u.", name, path, line);
- return -EINVAL;
- }
- } else {
- log_error("Unexpected token (4) at %s:%u.", path, line);
- return -EINVAL;
- }
-
- break;
-
- case STATE_POLICY_CONSOLE:
-
- if (t == XML_ATTRIBUTE_VALUE) {
- if (streq(name, "true")) {
- policy_category = POLICY_CATEGORY_ON_CONSOLE;
- state = STATE_POLICY;
- } else if (streq(name, "false")) {
- policy_category = POLICY_CATEGORY_NO_CONSOLE;
- state = STATE_POLICY;
- } else {
- log_error("at_console= parameter %s unknown for <policy> at %s:%u.", name, path, line);
- return -EINVAL;
- }
- } else {
- log_error("Unexpected token (4.1) at %s:%u.", path, line);
- return -EINVAL;
- }
-
- break;
-
- case STATE_POLICY_USER:
-
- if (t == XML_ATTRIBUTE_VALUE) {
- free(policy_user);
- policy_user = name;
- name = NULL;
- policy_category = POLICY_CATEGORY_USER;
- state = STATE_POLICY;
- } else {
- log_error("Unexpected token (5) in %s:%u.", path, line);
- return -EINVAL;
- }
-
- break;
-
- case STATE_POLICY_GROUP:
-
- if (t == XML_ATTRIBUTE_VALUE) {
- free(policy_group);
- policy_group = name;
- name = NULL;
- policy_category = POLICY_CATEGORY_GROUP;
- state = STATE_POLICY;
- } else {
- log_error("Unexpected token (6) at %s:%u.", path, line);
- return -EINVAL;
- }
-
- break;
-
- case STATE_POLICY_OTHER_ATTRIBUTE:
-
- if (t == XML_ATTRIBUTE_VALUE)
- state = STATE_POLICY;
- else {
- log_error("Unexpected token (7) in %s:%u.", path, line);
- return -EINVAL;
- }
-
- break;
-
- case STATE_ALLOW_DENY:
-
- assert(i);
-
- if (t == XML_ATTRIBUTE_NAME) {
- PolicyItemClass ic;
-
- if (startswith(name, "send_"))
- ic = POLICY_ITEM_SEND;
- else if (startswith(name, "receive_"))
- ic = POLICY_ITEM_RECV;
- else if (streq(name, "own"))
- ic = POLICY_ITEM_OWN;
- else if (streq(name, "own_prefix"))
- ic = POLICY_ITEM_OWN_PREFIX;
- else if (streq(name, "user"))
- ic = POLICY_ITEM_USER;
- else if (streq(name, "group"))
- ic = POLICY_ITEM_GROUP;
- else if (streq(name, "eavesdrop")) {
- log_debug("Unsupported attribute %s= at %s:%u, ignoring.", name, path, line);
- state = STATE_ALLOW_DENY_OTHER_ATTRIBUTE;
- break;
- } else {
- log_error("Unknown attribute %s= at %s:%u, ignoring.", name, path, line);
- state = STATE_ALLOW_DENY_OTHER_ATTRIBUTE;
- break;
- }
-
- if (i->class != _POLICY_ITEM_CLASS_UNSET && ic != i->class) {
- log_error("send_, receive_/eavesdrop fields mixed on same tag at %s:%u.", path, line);
- return -EINVAL;
- }
-
- i->class = ic;
-
- if (ic == POLICY_ITEM_SEND || ic == POLICY_ITEM_RECV) {
- const char *u;
-
- u = strchr(name, '_');
- assert(u);
-
- u++;
-
- if (streq(u, "interface"))
- state = STATE_ALLOW_DENY_INTERFACE;
- else if (streq(u, "member"))
- state = STATE_ALLOW_DENY_MEMBER;
- else if (streq(u, "error"))
- state = STATE_ALLOW_DENY_ERROR;
- else if (streq(u, "path"))
- state = STATE_ALLOW_DENY_PATH;
- else if (streq(u, "type"))
- state = STATE_ALLOW_DENY_MESSAGE_TYPE;
- else if ((streq(u, "destination") && ic == POLICY_ITEM_SEND) ||
- (streq(u, "sender") && ic == POLICY_ITEM_RECV))
- state = STATE_ALLOW_DENY_NAME;
- else {
- if (streq(u, "requested_reply"))
- log_debug("Unsupported attribute %s= at %s:%u, ignoring.", name, path, line);
- else
- log_error("Unknown attribute %s= at %s:%u, ignoring.", name, path, line);
- state = STATE_ALLOW_DENY_OTHER_ATTRIBUTE;
- break;
- }
- } else
- state = STATE_ALLOW_DENY_NAME;
-
- } else if (t == XML_TAG_CLOSE_EMPTY ||
- (t == XML_TAG_CLOSE && streq(name, i->type == POLICY_ITEM_ALLOW ? "allow" : "deny"))) {
-
- /* If the tag is fully empty so far, we consider it a recv */
- if (i->class == _POLICY_ITEM_CLASS_UNSET)
- i->class = POLICY_ITEM_RECV;
-
- if (policy_category == POLICY_CATEGORY_DEFAULT)
- item_append(i, &p->default_items);
- else if (policy_category == POLICY_CATEGORY_MANDATORY)
- item_append(i, &p->mandatory_items);
- else if (policy_category == POLICY_CATEGORY_ON_CONSOLE)
- item_append(i, &p->on_console_items);
- else if (policy_category == POLICY_CATEGORY_NO_CONSOLE)
- item_append(i, &p->no_console_items);
- else if (policy_category == POLICY_CATEGORY_USER) {
- const char *u = policy_user;
-
- assert_cc(sizeof(uid_t) == sizeof(uint32_t));
-
- r = hashmap_ensure_allocated(&p->user_items, NULL);
- if (r < 0)
- return log_oom();
-
- if (!u) {
- log_error("User policy without name");
- return -EINVAL;
- }
-
- r = get_user_creds(&u, &i->uid, NULL, NULL, NULL);
- if (r < 0) {
- log_error_errno(r, "Failed to resolve user %s, ignoring policy: %m", u);
- free(i);
- } else {
- PolicyItem *first;
-
- first = hashmap_get(p->user_items, UINT32_TO_PTR(i->uid));
- item_append(i, &first);
- i->uid_valid = true;
-
- r = hashmap_replace(p->user_items, UINT32_TO_PTR(i->uid), first);
- if (r < 0) {
- LIST_REMOVE(items, first, i);
- return log_oom();
- }
- }
-
- } else if (policy_category == POLICY_CATEGORY_GROUP) {
- const char *g = policy_group;
-
- assert_cc(sizeof(gid_t) == sizeof(uint32_t));
-
- r = hashmap_ensure_allocated(&p->group_items, NULL);
- if (r < 0)
- return log_oom();
-
- if (!g) {
- log_error("Group policy without name");
- return -EINVAL;
- }
-
- r = get_group_creds(&g, &i->gid);
- if (r < 0) {
- log_error_errno(r, "Failed to resolve group %s, ignoring policy: %m", g);
- free(i);
- } else {
- PolicyItem *first;
-
- first = hashmap_get(p->group_items, UINT32_TO_PTR(i->gid));
- item_append(i, &first);
- i->gid_valid = true;
-
- r = hashmap_replace(p->group_items, UINT32_TO_PTR(i->gid), first);
- if (r < 0) {
- LIST_REMOVE(items, first, i);
- return log_oom();
- }
- }
- }
-
- state = STATE_POLICY;
- i = NULL;
-
- } else if (t != XML_TEXT || !in_charset(name, WHITESPACE)) {
- log_error("Unexpected token (8) at %s:%u.", path, line);
- return -EINVAL;
- }
-
- break;
-
- case STATE_ALLOW_DENY_INTERFACE:
-
- if (t == XML_ATTRIBUTE_VALUE) {
- assert(i);
- if (i->interface) {
- log_error("Duplicate interface at %s:%u.", path, line);
- return -EINVAL;
- }
-
- if (!streq(name, "*")) {
- i->interface = name;
- name = NULL;
- }
- state = STATE_ALLOW_DENY;
- } else {
- log_error("Unexpected token (9) at %s:%u.", path, line);
- return -EINVAL;
- }
-
- break;
-
- case STATE_ALLOW_DENY_MEMBER:
-
- if (t == XML_ATTRIBUTE_VALUE) {
- assert(i);
- if (i->member) {
- log_error("Duplicate member in %s:%u.", path, line);
- return -EINVAL;
- }
-
- if (!streq(name, "*")) {
- i->member = name;
- name = NULL;
- }
- state = STATE_ALLOW_DENY;
- } else {
- log_error("Unexpected token (10) in %s:%u.", path, line);
- return -EINVAL;
- }
-
- break;
-
- case STATE_ALLOW_DENY_ERROR:
-
- if (t == XML_ATTRIBUTE_VALUE) {
- assert(i);
- if (i->error) {
- log_error("Duplicate error in %s:%u.", path, line);
- return -EINVAL;
- }
-
- if (!streq(name, "*")) {
- i->error = name;
- name = NULL;
- }
- state = STATE_ALLOW_DENY;
- } else {
- log_error("Unexpected token (11) in %s:%u.", path, line);
- return -EINVAL;
- }
-
- break;
-
- case STATE_ALLOW_DENY_PATH:
-
- if (t == XML_ATTRIBUTE_VALUE) {
- assert(i);
- if (i->path) {
- log_error("Duplicate path in %s:%u.", path, line);
- return -EINVAL;
- }
-
- if (!streq(name, "*")) {
- i->path = name;
- name = NULL;
- }
- state = STATE_ALLOW_DENY;
- } else {
- log_error("Unexpected token (12) in %s:%u.", path, line);
- return -EINVAL;
- }
-
- break;
-
- case STATE_ALLOW_DENY_MESSAGE_TYPE:
-
- if (t == XML_ATTRIBUTE_VALUE) {
- assert(i);
-
- if (i->message_type != 0) {
- log_error("Duplicate message type in %s:%u.", path, line);
- return -EINVAL;
- }
-
- if (!streq(name, "*")) {
- r = bus_message_type_from_string(name, &i->message_type);
- if (r < 0) {
- log_error("Invalid message type in %s:%u.", path, line);
- return -EINVAL;
- }
- }
-
- state = STATE_ALLOW_DENY;
- } else {
- log_error("Unexpected token (13) in %s:%u.", path, line);
- return -EINVAL;
- }
-
- break;
-
- case STATE_ALLOW_DENY_NAME:
-
- if (t == XML_ATTRIBUTE_VALUE) {
- assert(i);
- if (i->name) {
- log_error("Duplicate name in %s:%u.", path, line);
- return -EINVAL;
- }
-
- switch (i->class) {
- case POLICY_ITEM_USER:
- if (!streq(name, "*")) {
- const char *u = name;
-
- r = get_user_creds(&u, &i->uid, NULL, NULL, NULL);
- if (r < 0)
- log_error_errno(r, "Failed to resolve user %s: %m", name);
- else
- i->uid_valid = true;
- }
- break;
- case POLICY_ITEM_GROUP:
- if (!streq(name, "*")) {
- const char *g = name;
-
- r = get_group_creds(&g, &i->gid);
- if (r < 0)
- log_error_errno(r, "Failed to resolve group %s: %m", name);
- else
- i->gid_valid = true;
- }
- break;
-
- case POLICY_ITEM_SEND:
- case POLICY_ITEM_RECV:
-
- if (streq(name, "*")) {
- free(name);
- name = NULL;
- }
- break;
-
-
- default:
- break;
- }
-
- i->name = name;
- name = NULL;
-
- state = STATE_ALLOW_DENY;
- } else {
- log_error("Unexpected token (14) in %s:%u.", path, line);
- return -EINVAL;
- }
-
- break;
-
- case STATE_ALLOW_DENY_OTHER_ATTRIBUTE:
-
- if (t == XML_ATTRIBUTE_VALUE)
- state = STATE_ALLOW_DENY;
- else {
- log_error("Unexpected token (15) in %s:%u.", path, line);
- return -EINVAL;
- }
-
- break;
-
- case STATE_OTHER:
-
- if (t == XML_TAG_OPEN)
- n_other++;
- else if (t == XML_TAG_CLOSE || t == XML_TAG_CLOSE_EMPTY) {
-
- if (n_other == 0)
- state = STATE_BUSCONFIG;
- else
- n_other--;
- }
-
- break;
- }
- }
-}
-
-enum {
- DENY,
- ALLOW,
- DUNNO,
-};
-
-static const char *verdict_to_string(int v) {
- switch (v) {
-
- case DENY:
- return "DENY";
- case ALLOW:
- return "ALLOW";
- case DUNNO:
- return "DUNNO";
- }
-
- return NULL;
-}
-
-struct policy_check_filter {
- PolicyItemClass class;
- uid_t uid;
- gid_t gid;
- int message_type;
- const char *name;
- const char *interface;
- const char *path;
- const char *member;
-};
-
-static int is_permissive(PolicyItem *i) {
-
- assert(i);
-
- return (i->type == POLICY_ITEM_ALLOW) ? ALLOW : DENY;
-}
-
-static int check_policy_item(PolicyItem *i, const struct policy_check_filter *filter) {
-
- assert(i);
- assert(filter);
-
- switch (i->class) {
- case POLICY_ITEM_SEND:
- case POLICY_ITEM_RECV:
-
- if (i->name && !streq_ptr(i->name, filter->name))
- break;
-
- if ((i->message_type != 0) && (i->message_type != filter->message_type))
- break;
-
- if (i->path && !streq_ptr(i->path, filter->path))
- break;
-
- if (i->member && !streq_ptr(i->member, filter->member))
- break;
-
- if (i->interface && !streq_ptr(i->interface, filter->interface))
- break;
-
- return is_permissive(i);
-
- case POLICY_ITEM_OWN:
- assert(filter->name);
-
- if (streq(i->name, "*") || streq(i->name, filter->name))
- return is_permissive(i);
- break;
-
- case POLICY_ITEM_OWN_PREFIX:
- assert(filter->name);
-
- if (streq(i->name, "*") || service_name_startswith(filter->name, i->name))
- return is_permissive(i);
- break;
-
- case POLICY_ITEM_USER:
- if (filter->uid != UID_INVALID)
- if ((streq_ptr(i->name, "*") || (i->uid_valid && i->uid == filter->uid)))
- return is_permissive(i);
- break;
-
- case POLICY_ITEM_GROUP:
- if (filter->gid != GID_INVALID)
- if ((streq_ptr(i->name, "*") || (i->gid_valid && i->gid == filter->gid)))
- return is_permissive(i);
- break;
-
- case POLICY_ITEM_IGNORE:
- default:
- break;
- }
-
- return DUNNO;
-}
-
-static int check_policy_items(PolicyItem *items, const struct policy_check_filter *filter) {
-
- PolicyItem *i;
- int verdict = DUNNO;
-
- assert(filter);
-
- /* Check all policies in a set - a broader one might be followed by a more specific one,
- * and the order of rules in policy definitions matters */
- LIST_FOREACH(items, i, items) {
- int v;
-
- if (i->class != filter->class &&
- !(i->class == POLICY_ITEM_OWN_PREFIX && filter->class == POLICY_ITEM_OWN))
- continue;
-
- v = check_policy_item(i, filter);
- if (v != DUNNO)
- verdict = v;
- }
-
- return verdict;
-}
-
-static int policy_check(Policy *p, const struct policy_check_filter *filter) {
-
- PolicyItem *items;
- int verdict, v;
-
- assert(p);
- assert(filter);
-
- assert(IN_SET(filter->class, POLICY_ITEM_SEND, POLICY_ITEM_RECV, POLICY_ITEM_OWN, POLICY_ITEM_USER, POLICY_ITEM_GROUP));
-
- /*
- * The policy check is implemented by the following logic:
- *
- * 1. Check default items
- * 2. Check group items
- * 3. Check user items
- * 4. Check on/no_console items
- * 5. Check mandatory items
- *
- * Later rules override earlier rules.
- */
-
- verdict = check_policy_items(p->default_items, filter);
-
- if (filter->gid != GID_INVALID) {
- items = hashmap_get(p->group_items, UINT32_TO_PTR(filter->gid));
- if (items) {
- v = check_policy_items(items, filter);
- if (v != DUNNO)
- verdict = v;
- }
- }
-
- if (filter->uid != UID_INVALID) {
- items = hashmap_get(p->user_items, UINT32_TO_PTR(filter->uid));
- if (items) {
- v = check_policy_items(items, filter);
- if (v != DUNNO)
- verdict = v;
- }
- }
-
- if (filter->uid != UID_INVALID && sd_uid_get_seats(filter->uid, -1, NULL) > 0)
- v = check_policy_items(p->on_console_items, filter);
- else
- v = check_policy_items(p->no_console_items, filter);
- if (v != DUNNO)
- verdict = v;
-
- v = check_policy_items(p->mandatory_items, filter);
- if (v != DUNNO)
- verdict = v;
-
- return verdict;
-}
-
-bool policy_check_own(Policy *p, uid_t uid, gid_t gid, const char *name) {
-
- struct policy_check_filter filter = {
- .class = POLICY_ITEM_OWN,
- .uid = uid,
- .gid = gid,
- .name = name,
- };
-
- int verdict;
-
- assert(p);
- assert(name);
-
- verdict = policy_check(p, &filter);
-
- log_full(LOG_AUTH | (verdict != ALLOW ? LOG_WARNING : LOG_DEBUG),
- "Ownership permission check for uid=" UID_FMT " gid=" GID_FMT" name=%s: %s",
- uid, gid, strna(name), strna(verdict_to_string(verdict)));
-
- return verdict == ALLOW;
-}
-
-bool policy_check_hello(Policy *p, uid_t uid, gid_t gid) {
-
- struct policy_check_filter filter = {
- .uid = uid,
- .gid = gid,
- };
- int verdict;
-
- assert(p);
-
- filter.class = POLICY_ITEM_USER;
- verdict = policy_check(p, &filter);
-
- if (verdict != DENY) {
- int v;
-
- filter.class = POLICY_ITEM_GROUP;
- v = policy_check(p, &filter);
- if (v != DUNNO)
- verdict = v;
- }
-
- log_full(LOG_AUTH | (verdict != ALLOW ? LOG_WARNING : LOG_DEBUG),
- "Hello permission check for uid=" UID_FMT " gid=" GID_FMT": %s",
- uid, gid, strna(verdict_to_string(verdict)));
-
- return verdict == ALLOW;
-}
-
-bool policy_check_one_recv(Policy *p,
- uid_t uid,
- gid_t gid,
- int message_type,
- const char *name,
- const char *path,
- const char *interface,
- const char *member) {
-
- struct policy_check_filter filter = {
- .class = POLICY_ITEM_RECV,
- .uid = uid,
- .gid = gid,
- .message_type = message_type,
- .name = name,
- .interface = interface,
- .path = path,
- .member = member,
- };
-
- assert(p);
-
- return policy_check(p, &filter) == ALLOW;
-}
-
-bool policy_check_recv(Policy *p,
- uid_t uid,
- gid_t gid,
- int message_type,
- Set *names,
- char **namesv,
- const char *path,
- const char *interface,
- const char *member,
- bool dbus_to_kernel) {
-
- char *n, **nv, *last = NULL;
- bool allow = false;
- Iterator i;
-
- assert(p);
-
- if (set_isempty(names) && strv_isempty(namesv)) {
- allow = policy_check_one_recv(p, uid, gid, message_type, NULL, path, interface, member);
- } else {
- SET_FOREACH(n, names, i) {
- last = n;
- allow = policy_check_one_recv(p, uid, gid, message_type, n, path, interface, member);
- if (allow)
- break;
- }
- if (!allow) {
- STRV_FOREACH(nv, namesv) {
- last = *nv;
- allow = policy_check_one_recv(p, uid, gid, message_type, *nv, path, interface, member);
- if (allow)
- break;
- }
- }
- }
-
- log_full(LOG_AUTH | (!allow ? LOG_WARNING : LOG_DEBUG),
- "Receive permission check %s for uid=" UID_FMT " gid=" GID_FMT" message=%s name=%s path=%s interface=%s member=%s: %s",
- dbus_to_kernel ? "dbus-1 to kernel" : "kernel to dbus-1", uid, gid, bus_message_type_to_string(message_type), strna(last),
- strna(path), strna(interface), strna(member), allow ? "ALLOW" : "DENY");
-
- return allow;
-}
-
-bool policy_check_one_send(Policy *p,
- uid_t uid,
- gid_t gid,
- int message_type,
- const char *name,
- const char *path,
- const char *interface,
- const char *member) {
-
- struct policy_check_filter filter = {
- .class = POLICY_ITEM_SEND,
- .uid = uid,
- .gid = gid,
- .message_type = message_type,
- .name = name,
- .interface = interface,
- .path = path,
- .member = member,
- };
-
- assert(p);
-
- return policy_check(p, &filter) == ALLOW;
-}
-
-bool policy_check_send(Policy *p,
- uid_t uid,
- gid_t gid,
- int message_type,
- Set *names,
- char **namesv,
- const char *path,
- const char *interface,
- const char *member,
- bool dbus_to_kernel,
- char **out_used_name) {
-
- char *n, **nv, *last = NULL;
- bool allow = false;
- Iterator i;
-
- assert(p);
-
- if (set_isempty(names) && strv_isempty(namesv)) {
- allow = policy_check_one_send(p, uid, gid, message_type, NULL, path, interface, member);
- } else {
- SET_FOREACH(n, names, i) {
- last = n;
- allow = policy_check_one_send(p, uid, gid, message_type, n, path, interface, member);
- if (allow)
- break;
- }
- if (!allow) {
- STRV_FOREACH(nv, namesv) {
- last = *nv;
- allow = policy_check_one_send(p, uid, gid, message_type, *nv, path, interface, member);
- if (allow)
- break;
- }
- }
- }
-
- if (out_used_name)
- *out_used_name = last;
-
- log_full(LOG_AUTH | (!allow ? LOG_WARNING : LOG_DEBUG),
- "Send permission check %s for uid=" UID_FMT " gid=" GID_FMT" message=%s name=%s path=%s interface=%s member=%s: %s",
- dbus_to_kernel ? "dbus-1 to kernel" : "kernel to dbus-1", uid, gid, bus_message_type_to_string(message_type), strna(last),
- strna(path), strna(interface), strna(member), allow ? "ALLOW" : "DENY");
-
- return allow;
-}
-
-int policy_load(Policy *p, char **files) {
- char **i;
- int r;
-
- assert(p);
-
- STRV_FOREACH(i, files) {
-
- r = file_load(p, *i);
- if (r == -EISDIR) {
- _cleanup_strv_free_ char **l = NULL;
- char **j;
-
- r = conf_files_list(&l, ".conf", NULL, *i, NULL);
- if (r < 0)
- return log_error_errno(r, "Failed to get configuration file list: %m");
-
- STRV_FOREACH(j, l)
- file_load(p, *j);
- }
-
- /* We ignore all errors but EISDIR, and just proceed. */
- }
-
- return 0;
-}
-
-void policy_free(Policy *p) {
- PolicyItem *i, *first;
-
- if (!p)
- return;
-
- while ((i = p->default_items)) {
- LIST_REMOVE(items, p->default_items, i);
- policy_item_free(i);
- }
-
- while ((i = p->mandatory_items)) {
- LIST_REMOVE(items, p->mandatory_items, i);
- policy_item_free(i);
- }
-
- while ((i = p->on_console_items)) {
- LIST_REMOVE(items, p->on_console_items, i);
- policy_item_free(i);
- }
-
- while ((i = p->no_console_items)) {
- LIST_REMOVE(items, p->no_console_items, i);
- policy_item_free(i);
- }
-
- while ((first = hashmap_steal_first(p->user_items))) {
-
- while ((i = first)) {
- LIST_REMOVE(items, first, i);
- policy_item_free(i);
- }
- }
-
- while ((first = hashmap_steal_first(p->group_items))) {
-
- while ((i = first)) {
- LIST_REMOVE(items, first, i);
- policy_item_free(i);
- }
- }
-
- hashmap_free(p->user_items);
- hashmap_free(p->group_items);
-
- p->user_items = p->group_items = NULL;
-}
-
-static void dump_items(PolicyItem *items, const char *prefix) {
-
- PolicyItem *i;
-
- if (!items)
- return;
-
- if (!prefix)
- prefix = "";
-
- LIST_FOREACH(items, i, items) {
-
- printf("%sType: %s\n"
- "%sClass: %s\n",
- prefix, policy_item_type_to_string(i->type),
- prefix, policy_item_class_to_string(i->class));
-
- if (i->interface)
- printf("%sInterface: %s\n",
- prefix, i->interface);
-
- if (i->member)
- printf("%sMember: %s\n",
- prefix, i->member);
-
- if (i->error)
- printf("%sError: %s\n",
- prefix, i->error);
-
- if (i->path)
- printf("%sPath: %s\n",
- prefix, i->path);
-
- if (i->name)
- printf("%sName: %s\n",
- prefix, i->name);
-
- if (i->message_type != 0)
- printf("%sMessage Type: %s\n",
- prefix, bus_message_type_to_string(i->message_type));
-
- if (i->uid_valid) {
- _cleanup_free_ char *user;
-
- user = uid_to_name(i->uid);
-
- printf("%sUser: %s ("UID_FMT")\n",
- prefix, strna(user), i->uid);
- }
-
- if (i->gid_valid) {
- _cleanup_free_ char *group;
-
- group = gid_to_name(i->gid);
-
- printf("%sGroup: %s ("GID_FMT")\n",
- prefix, strna(group), i->gid);
- }
- printf("%s-\n", prefix);
- }
-}
-
-static void dump_hashmap_items(Hashmap *h) {
- PolicyItem *i;
- Iterator j;
- void *k;
-
- HASHMAP_FOREACH_KEY(i, k, h, j) {
- printf("\t%s Item for %u:\n", draw_special_char(DRAW_ARROW), PTR_TO_UINT(k));
- dump_items(i, "\t\t");
- }
-}
-
-void policy_dump(Policy *p) {
-
- printf("%s Default Items:\n", draw_special_char(DRAW_ARROW));
- dump_items(p->default_items, "\t");
-
- printf("%s Group Items:\n", draw_special_char(DRAW_ARROW));
- dump_hashmap_items(p->group_items);
-
- printf("%s User Items:\n", draw_special_char(DRAW_ARROW));
- dump_hashmap_items(p->user_items);
-
- printf("%s On-Console Items:\n", draw_special_char(DRAW_ARROW));
- dump_items(p->on_console_items, "\t");
-
- printf("%s No-Console Items:\n", draw_special_char(DRAW_ARROW));
- dump_items(p->no_console_items, "\t");
-
- printf("%s Mandatory Items:\n", draw_special_char(DRAW_ARROW));
- dump_items(p->mandatory_items, "\t");
-
- fflush(stdout);
-}
-
-int shared_policy_new(SharedPolicy **out) {
- SharedPolicy *sp;
- int r;
-
- sp = new0(SharedPolicy, 1);
- if (!sp)
- return log_oom();
-
- r = pthread_mutex_init(&sp->lock, NULL);
- if (r < 0) {
- log_error_errno(r, "Cannot initialize shared policy mutex: %m");
- goto exit_free;
- }
-
- r = pthread_rwlock_init(&sp->rwlock, NULL);
- if (r < 0) {
- log_error_errno(r, "Cannot initialize shared policy rwlock: %m");
- goto exit_mutex;
- }
-
- *out = sp;
- sp = NULL;
- return 0;
-
- /* pthread lock destruction is not fail-safe... meh! */
-exit_mutex:
- pthread_mutex_destroy(&sp->lock);
-exit_free:
- free(sp);
- return r;
-}
-
-SharedPolicy *shared_policy_free(SharedPolicy *sp) {
- if (!sp)
- return NULL;
-
- policy_free(sp->policy);
- pthread_rwlock_destroy(&sp->rwlock);
- pthread_mutex_destroy(&sp->lock);
- strv_free(sp->configuration);
- free(sp);
-
- return NULL;
-}
-
-static int shared_policy_reload_unlocked(SharedPolicy *sp, char **configuration) {
- Policy old, buffer = {};
- bool free_old;
- int r;
-
- assert(sp);
-
- r = policy_load(&buffer, configuration);
- if (r < 0)
- return log_error_errno(r, "Failed to load policy: %m");
-
- log_debug("Reloading configuration");
- /* policy_dump(&buffer); */
-
- pthread_rwlock_wrlock(&sp->rwlock);
- memcpy(&old, &sp->buffer, sizeof(old));
- memcpy(&sp->buffer, &buffer, sizeof(buffer));
- free_old = !!sp->policy;
- sp->policy = &sp->buffer;
- pthread_rwlock_unlock(&sp->rwlock);
-
- if (free_old)
- policy_free(&old);
-
- return 0;
-}
-
-int shared_policy_reload(SharedPolicy *sp) {
- int r;
-
- assert(sp);
-
- pthread_mutex_lock(&sp->lock);
- r = shared_policy_reload_unlocked(sp, sp->configuration);
- pthread_mutex_unlock(&sp->lock);
-
- return r;
-}
-
-int shared_policy_preload(SharedPolicy *sp, char **configuration) {
- _cleanup_strv_free_ char **conf = NULL;
- int r = 0;
-
- assert(sp);
-
- conf = strv_copy(configuration);
- if (!conf)
- return log_oom();
-
- pthread_mutex_lock(&sp->lock);
- if (!sp->policy) {
- r = shared_policy_reload_unlocked(sp, conf);
- if (r >= 0) {
- sp->configuration = conf;
- conf = NULL;
- }
- }
- pthread_mutex_unlock(&sp->lock);
-
- return r;
-}
-
-Policy *shared_policy_acquire(SharedPolicy *sp) {
- assert(sp);
-
- pthread_rwlock_rdlock(&sp->rwlock);
- if (sp->policy)
- return sp->policy;
- pthread_rwlock_unlock(&sp->rwlock);
-
- return NULL;
-}
-
-void shared_policy_release(SharedPolicy *sp, Policy *p) {
- assert(sp);
- assert(!p || sp->policy == p);
-
- if (p)
- pthread_rwlock_unlock(&sp->rwlock);
-}
-
-static const char* const policy_item_type_table[_POLICY_ITEM_TYPE_MAX] = {
- [_POLICY_ITEM_TYPE_UNSET] = "unset",
- [POLICY_ITEM_ALLOW] = "allow",
- [POLICY_ITEM_DENY] = "deny",
-};
-DEFINE_STRING_TABLE_LOOKUP(policy_item_type, PolicyItemType);
-
-static const char* const policy_item_class_table[_POLICY_ITEM_CLASS_MAX] = {
- [_POLICY_ITEM_CLASS_UNSET] = "unset",
- [POLICY_ITEM_SEND] = "send",
- [POLICY_ITEM_RECV] = "recv",
- [POLICY_ITEM_OWN] = "own",
- [POLICY_ITEM_OWN_PREFIX] = "own-prefix",
- [POLICY_ITEM_USER] = "user",
- [POLICY_ITEM_GROUP] = "group",
- [POLICY_ITEM_IGNORE] = "ignore",
-};
-DEFINE_STRING_TABLE_LOOKUP(policy_item_class, PolicyItemClass);
~ianmdlvl / elogind.git / commitdiff