617 lines
18 KiB
C
617 lines
18 KiB
C
/* SPDX-License-Identifier: LGPL-2.1+ */
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/***
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This file is part of systemd.
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Copyright 2015 Lennart Poettering
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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#include "alloc-util.h"
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#include "cap-list.h"
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#include "conf-parser.h"
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#include "nspawn-network.h"
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#include "nspawn-settings.h"
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#include "parse-util.h"
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#include "process-util.h"
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#include "socket-util.h"
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#include "string-util.h"
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#include "strv.h"
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#include "user-util.h"
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#include "util.h"
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int settings_load(FILE *f, const char *path, Settings **ret) {
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_cleanup_(settings_freep) Settings *s = NULL;
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int r;
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assert(path);
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assert(ret);
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s = new0(Settings, 1);
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if (!s)
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return -ENOMEM;
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s->start_mode = _START_MODE_INVALID;
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s->personality = PERSONALITY_INVALID;
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s->userns_mode = _USER_NAMESPACE_MODE_INVALID;
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s->uid_shift = UID_INVALID;
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s->uid_range = UID_INVALID;
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s->read_only = -1;
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s->volatile_mode = _VOLATILE_MODE_INVALID;
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s->userns_chown = -1;
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s->private_network = -1;
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s->network_veth = -1;
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r = config_parse(NULL, path, f,
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"Exec\0"
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"Network\0"
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"Files\0",
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config_item_perf_lookup, nspawn_gperf_lookup,
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CONFIG_PARSE_WARN,
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s);
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if (r < 0)
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return r;
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/* Make sure that if userns_mode is set, userns_chown is set to something appropriate, and vice versa. Either
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* both fields shall be initialized or neither. */
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if (s->userns_mode == USER_NAMESPACE_PICK)
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s->userns_chown = true;
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else if (s->userns_mode != _USER_NAMESPACE_MODE_INVALID && s->userns_chown < 0)
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s->userns_chown = false;
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if (s->userns_chown >= 0 && s->userns_mode == _USER_NAMESPACE_MODE_INVALID)
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s->userns_mode = USER_NAMESPACE_NO;
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*ret = TAKE_PTR(s);
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return 0;
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}
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Settings* settings_free(Settings *s) {
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if (!s)
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return NULL;
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strv_free(s->parameters);
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strv_free(s->environment);
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free(s->user);
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free(s->pivot_root_new);
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free(s->pivot_root_old);
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free(s->working_directory);
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strv_free(s->syscall_whitelist);
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strv_free(s->syscall_blacklist);
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strv_free(s->network_interfaces);
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strv_free(s->network_macvlan);
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strv_free(s->network_ipvlan);
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strv_free(s->network_veth_extra);
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free(s->network_bridge);
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free(s->network_zone);
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expose_port_free_all(s->expose_ports);
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custom_mount_free_all(s->custom_mounts, s->n_custom_mounts);
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return mfree(s);
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}
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bool settings_private_network(Settings *s) {
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assert(s);
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return
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s->private_network > 0 ||
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s->network_veth > 0 ||
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s->network_bridge ||
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s->network_zone ||
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s->network_interfaces ||
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s->network_macvlan ||
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s->network_ipvlan ||
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s->network_veth_extra;
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}
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bool settings_network_veth(Settings *s) {
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assert(s);
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return
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s->network_veth > 0 ||
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s->network_bridge ||
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s->network_zone;
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}
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DEFINE_CONFIG_PARSE_ENUM(config_parse_volatile_mode, volatile_mode, VolatileMode, "Failed to parse volatile mode");
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int config_parse_expose_port(
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const char *unit,
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const char *filename,
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unsigned line,
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const char *section,
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unsigned section_line,
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const char *lvalue,
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int ltype,
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const char *rvalue,
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void *data,
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void *userdata) {
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Settings *s = data;
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int r;
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assert(filename);
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assert(lvalue);
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assert(rvalue);
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r = expose_port_parse(&s->expose_ports, rvalue);
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if (r == -EEXIST) {
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log_syntax(unit, LOG_ERR, filename, line, r, "Duplicate port specification, ignoring: %s", rvalue);
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return 0;
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}
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if (r < 0) {
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log_syntax(unit, LOG_ERR, filename, line, r, "Failed to parse host port %s: %m", rvalue);
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return 0;
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}
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return 0;
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}
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int config_parse_capability(
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const char *unit,
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const char *filename,
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unsigned line,
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const char *section,
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unsigned section_line,
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const char *lvalue,
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int ltype,
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const char *rvalue,
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void *data,
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void *userdata) {
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uint64_t u = 0, *result = data;
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int r;
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assert(filename);
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assert(lvalue);
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assert(rvalue);
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for (;;) {
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_cleanup_free_ char *word = NULL;
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int cap;
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r = extract_first_word(&rvalue, &word, NULL, 0);
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if (r < 0) {
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log_syntax(unit, LOG_ERR, filename, line, r, "Failed to extract capability string, ignoring: %s", rvalue);
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return 0;
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}
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if (r == 0)
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break;
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cap = capability_from_name(word);
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if (cap < 0) {
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log_syntax(unit, LOG_ERR, filename, line, 0, "Failed to parse capability, ignoring: %s", word);
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continue;
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}
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u |= UINT64_C(1) << cap;
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}
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if (u == 0)
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return 0;
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*result |= u;
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return 0;
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}
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int config_parse_id128(
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const char *unit,
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const char *filename,
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unsigned line,
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const char *section,
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unsigned section_line,
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const char *lvalue,
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int ltype,
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const char *rvalue,
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void *data,
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void *userdata) {
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sd_id128_t t, *result = data;
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int r;
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assert(filename);
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assert(lvalue);
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assert(rvalue);
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r = sd_id128_from_string(rvalue, &t);
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if (r < 0) {
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log_syntax(unit, LOG_ERR, filename, line, r, "Failed to parse 128bit ID/UUID, ignoring: %s", rvalue);
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return 0;
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}
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*result = t;
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return 0;
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}
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int config_parse_pivot_root(
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const char *unit,
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const char *filename,
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unsigned line,
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const char *section,
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unsigned section_line,
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const char *lvalue,
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int ltype,
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const char *rvalue,
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void *data,
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void *userdata) {
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Settings *settings = data;
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int r;
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assert(filename);
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assert(lvalue);
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assert(rvalue);
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r = pivot_root_parse(&settings->pivot_root_new, &settings->pivot_root_old, rvalue);
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if (r < 0) {
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log_syntax(unit, LOG_ERR, filename, line, r, "Invalid pivot root mount specification %s: %m", rvalue);
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return 0;
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}
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return 0;
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}
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int config_parse_bind(
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const char *unit,
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const char *filename,
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unsigned line,
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const char *section,
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unsigned section_line,
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const char *lvalue,
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int ltype,
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const char *rvalue,
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void *data,
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void *userdata) {
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Settings *settings = data;
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int r;
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assert(filename);
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assert(lvalue);
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assert(rvalue);
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r = bind_mount_parse(&settings->custom_mounts, &settings->n_custom_mounts, rvalue, ltype);
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if (r < 0) {
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log_syntax(unit, LOG_ERR, filename, line, r, "Invalid bind mount specification %s: %m", rvalue);
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return 0;
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}
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return 0;
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}
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int config_parse_tmpfs(
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const char *unit,
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const char *filename,
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unsigned line,
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const char *section,
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unsigned section_line,
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const char *lvalue,
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int ltype,
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const char *rvalue,
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void *data,
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void *userdata) {
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Settings *settings = data;
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int r;
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assert(filename);
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assert(lvalue);
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assert(rvalue);
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r = tmpfs_mount_parse(&settings->custom_mounts, &settings->n_custom_mounts, rvalue);
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if (r < 0) {
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log_syntax(unit, LOG_ERR, filename, line, r, "Invalid temporary file system specification %s: %m", rvalue);
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return 0;
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}
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return 0;
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}
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int config_parse_overlay(
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const char *unit,
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const char *filename,
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unsigned line,
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const char *section,
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unsigned section_line,
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const char *lvalue,
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int ltype,
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const char *rvalue,
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void *data,
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void *userdata) {
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Settings *settings = data;
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int r;
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assert(filename);
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assert(lvalue);
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assert(rvalue);
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r = overlay_mount_parse(&settings->custom_mounts, &settings->n_custom_mounts, rvalue, ltype);
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if (r < 0)
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log_syntax(unit, LOG_ERR, filename, line, r, "Invalid overlay file system specification %s, ignoring: %m", rvalue);
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return 0;
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}
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int config_parse_veth_extra(
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const char *unit,
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const char *filename,
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unsigned line,
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const char *section,
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unsigned section_line,
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const char *lvalue,
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int ltype,
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const char *rvalue,
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void *data,
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void *userdata) {
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Settings *settings = data;
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int r;
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assert(filename);
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assert(lvalue);
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assert(rvalue);
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r = veth_extra_parse(&settings->network_veth_extra, rvalue);
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if (r < 0) {
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log_syntax(unit, LOG_ERR, filename, line, r, "Invalid extra virtual Ethernet link specification %s: %m", rvalue);
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return 0;
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}
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return 0;
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}
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int config_parse_network_zone(
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const char *unit,
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const char *filename,
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unsigned line,
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const char *section,
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unsigned section_line,
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const char *lvalue,
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int ltype,
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const char *rvalue,
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void *data,
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void *userdata) {
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Settings *settings = data;
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_cleanup_free_ char *j = NULL;
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assert(filename);
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assert(lvalue);
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assert(rvalue);
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j = strappend("vz-", rvalue);
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if (!ifname_valid(j)) {
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log_syntax(unit, LOG_ERR, filename, line, 0, "Invalid network zone name %s, ignoring: %m", rvalue);
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return 0;
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}
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free_and_replace(settings->network_zone, j);
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return 0;
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}
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int config_parse_boot(
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const char *unit,
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const char *filename,
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unsigned line,
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const char *section,
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unsigned section_line,
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const char *lvalue,
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int ltype,
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const char *rvalue,
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void *data,
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void *userdata) {
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Settings *settings = data;
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int r;
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assert(filename);
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assert(lvalue);
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assert(rvalue);
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r = parse_boolean(rvalue);
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if (r < 0) {
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log_syntax(unit, LOG_ERR, filename, line, r, "Failed to parse Boot= parameter %s, ignoring: %m", rvalue);
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return 0;
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}
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if (r > 0) {
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if (settings->start_mode == START_PID2)
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goto conflict;
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settings->start_mode = START_BOOT;
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} else {
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if (settings->start_mode == START_BOOT)
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goto conflict;
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if (settings->start_mode < 0)
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settings->start_mode = START_PID1;
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}
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return 0;
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conflict:
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log_syntax(unit, LOG_ERR, filename, line, r, "Conflicting Boot= or ProcessTwo= setting found. Ignoring.");
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return 0;
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}
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int config_parse_pid2(
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const char *unit,
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const char *filename,
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unsigned line,
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const char *section,
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unsigned section_line,
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const char *lvalue,
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int ltype,
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const char *rvalue,
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void *data,
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void *userdata) {
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Settings *settings = data;
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int r;
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assert(filename);
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assert(lvalue);
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assert(rvalue);
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r = parse_boolean(rvalue);
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if (r < 0) {
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log_syntax(unit, LOG_ERR, filename, line, r, "Failed to parse ProcessTwo= parameter %s, ignoring: %m", rvalue);
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return 0;
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}
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if (r > 0) {
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if (settings->start_mode == START_BOOT)
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goto conflict;
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settings->start_mode = START_PID2;
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} else {
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if (settings->start_mode == START_PID2)
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goto conflict;
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if (settings->start_mode < 0)
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settings->start_mode = START_PID1;
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}
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return 0;
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conflict:
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log_syntax(unit, LOG_ERR, filename, line, r, "Conflicting Boot= or ProcessTwo= setting found. Ignoring.");
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return 0;
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}
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int config_parse_private_users(
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const char *unit,
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const char *filename,
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unsigned line,
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const char *section,
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unsigned section_line,
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const char *lvalue,
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int ltype,
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const char *rvalue,
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void *data,
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void *userdata) {
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Settings *settings = data;
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int r;
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assert(filename);
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assert(lvalue);
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assert(rvalue);
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r = parse_boolean(rvalue);
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if (r == 0) {
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/* no: User namespacing off */
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settings->userns_mode = USER_NAMESPACE_NO;
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settings->uid_shift = UID_INVALID;
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settings->uid_range = UINT32_C(0x10000);
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} else if (r > 0) {
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/* yes: User namespacing on, UID range is read from root dir */
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settings->userns_mode = USER_NAMESPACE_FIXED;
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settings->uid_shift = UID_INVALID;
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settings->uid_range = UINT32_C(0x10000);
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} else if (streq(rvalue, "pick")) {
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/* pick: User namespacing on, UID range is picked randomly */
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settings->userns_mode = USER_NAMESPACE_PICK;
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settings->uid_shift = UID_INVALID;
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settings->uid_range = UINT32_C(0x10000);
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} else {
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const char *range, *shift;
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uid_t sh, rn;
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/* anything else: User namespacing on, UID range is explicitly configured */
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range = strchr(rvalue, ':');
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if (range) {
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shift = strndupa(rvalue, range - rvalue);
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range++;
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r = safe_atou32(range, &rn);
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if (r < 0 || rn <= 0) {
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log_syntax(unit, LOG_ERR, filename, line, r, "UID/GID range invalid, ignoring: %s", range);
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return 0;
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}
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} else {
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shift = rvalue;
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rn = UINT32_C(0x10000);
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}
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r = parse_uid(shift, &sh);
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if (r < 0) {
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log_syntax(unit, LOG_ERR, filename, line, r, "UID/GID shift invalid, ignoring: %s", range);
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return 0;
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}
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settings->userns_mode = USER_NAMESPACE_FIXED;
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settings->uid_shift = sh;
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settings->uid_range = rn;
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}
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return 0;
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}
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int config_parse_syscall_filter(
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const char *unit,
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const char *filename,
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unsigned line,
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const char *section,
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unsigned section_line,
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const char *lvalue,
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int ltype,
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const char *rvalue,
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void *data,
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void *userdata) {
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Settings *settings = data;
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bool negative;
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|
const char *items;
|
|
int r;
|
|
|
|
assert(filename);
|
|
assert(lvalue);
|
|
assert(rvalue);
|
|
|
|
negative = rvalue[0] == '~';
|
|
items = negative ? rvalue + 1 : rvalue;
|
|
|
|
for (;;) {
|
|
_cleanup_free_ char *word = NULL;
|
|
|
|
r = extract_first_word(&items, &word, NULL, 0);
|
|
if (r == 0)
|
|
break;
|
|
if (r == -ENOMEM)
|
|
return log_oom();
|
|
if (r < 0) {
|
|
log_syntax(unit, LOG_ERR, filename, line, r, "Failed to parse SystemCallFilter= parameter %s, ignoring: %m", rvalue);
|
|
return 0;
|
|
}
|
|
|
|
if (negative)
|
|
r = strv_extend(&settings->syscall_blacklist, word);
|
|
else
|
|
r = strv_extend(&settings->syscall_whitelist, word);
|
|
if (r < 0)
|
|
return log_oom();
|
|
}
|
|
|
|
return 0;
|
|
}
|