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analyze: add --profile switch to security verb

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Allows to pass a portable profile when doing offline analysis of
units. Especially useful for analyzing portable images, since a
lot of the security-relevant settings in those cases come from
the profiles, but they are not shipped in the portable images.
This commit is contained in:
Luca Boccassi 2021-11-26 15:46:40 +00:00
parent 83de7427dc
commit 0446921131
7 changed files with 89 additions and 2 deletions
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9
man/systemd-analyze.xml
View file

@ -818,6 +818,15 @@ $ systemd-analyze verify /tmp/source:alias.service
an error.</para></listitem>
</varlistentry>
<varlistentry>
<term><option>--profile=<replaceable>PATH</replaceable></option></term>
<listitem><para>With <command>security</command> <option>--offline=</option>, takes into
consideration the specified portable profile when assessing the unit(s) settings.
The profile can be passed by name, in which case the well-known system locations will
be searched, or it can be the full path to a specific drop-in file.</para></listitem>
</varlistentry>
<varlistentry>
<term><option>--threshold=<replaceable>NUMBER</replaceable></option></term>

2
shell-completion/bash/systemd-analyze
View file

@ -145,7 +145,7 @@ _systemd_analyze() {
elif __contains_word "$verb" ${VERBS[SECURITY]}; then
if [[ $cur = -* ]]; then
comps='--help --version --no-pager --system --user -H --host -M --machine --offline --threshold --security-policy --json=off --json=pretty --json=short --root --image'
comps='--help --version --no-pager --system --user -H --host -M --machine --offline --threshold --security-policy --json=off --json=pretty --json=short --root --image --profile=default --profile=nonetwork --profile=strict --profile=trusted'
elif ! __contains_word "--offline" ${COMP_WORDS[*]}; then
if __contains_word "--user" ${COMP_WORDS[*]}; then
mode=--user

1
shell-completion/zsh/_systemd-analyze
View file

@ -87,6 +87,7 @@ _arguments \
'--threshold=[Set a value to compare the overall security exposure level with]: NUMBER' \
'--security-policy=[Allow user to use customized requirements to compare unit file(s) against]: PATH' \
'--json=[Generate a JSON output of the security analysis table]:MODE:(pretty short off)' \
'--profile=[Include the specified profile in the security review of the unit(s)]: PATH' \
'--no-pager[Do not pipe output into a pager]' \
'--man=[Do (not) check for existence of man pages]:BOOL:(yes no)' \
'--generators=[Do (not) run unit generators]:BOOL:(yes no)' \

40
src/analyze/analyze-security.c
View file

@ -9,6 +9,7 @@
#include "bus-map-properties.h"
#include "bus-unit-util.h"
#include "bus-util.h"
#include "copy.h"
#include "env-util.h"
#include "format-table.h"
#include "in-addr-prefix-util.h"
@ -17,6 +18,7 @@
#include "manager.h"
#include "missing_capability.h"
#include "missing_sched.h"
#include "mkdir.h"
#include "nulstr-util.h"
#include "parse-util.h"
#include "path-util.h"
@ -2646,6 +2648,7 @@ static int offline_security_checks(char **filenames,
bool run_generators,
unsigned threshold,
const char *root,
const char *profile,
PagerFlags pager_flags,
JsonFormatFlags json_format_flags) {
@ -2682,6 +2685,13 @@ static int offline_security_checks(char **filenames,
if (r < 0)
return r;
if (profile) {
/* Ensure the temporary directory is in the search path, so that we can add drop-ins. */
r = strv_extend(&m->lookup_paths.search_path, m->lookup_paths.temporary_dir);
if (r < 0)
return log_oom();
}
log_debug("Loading remaining units from the command line...");
STRV_FOREACH(filename, filenames) {
@ -2697,6 +2707,33 @@ static int offline_security_checks(char **filenames,
continue;
}
/* When a portable image is analyzed, the profile is what provides a good chunk of
* the security-related settings, but they are obviously not shipped with the image.
* This allows to take them in consideration. */
if (profile) {
_cleanup_free_ char *unit_name = NULL, *dropin = NULL, *profile_path = NULL;
r = path_extract_filename(prepared, &unit_name);
if (r < 0)
return log_oom();
dropin = strjoin(m->lookup_paths.temporary_dir, "/", unit_name, ".d/profile.conf");
if (!dropin)
return log_oom();
(void) mkdir_parents(dropin, 0755);
if (!is_path(profile)) {
r = find_portable_profile(profile, unit_name, &profile_path);
if (r < 0)
return log_error_errno(r, "Failed to find portable profile %s: %m", profile);
profile = profile_path;
}
r = copy_file(profile, dropin, 0, 0644, 0, 0, 0);
if (r < 0)
return log_error_errno(r, "Failed to copy: %m");
}
k = manager_load_startable_unit_or_warn(m, NULL, prepared, &units[count]);
if (k < 0) {
if (r == 0)
@ -2725,6 +2762,7 @@ int analyze_security(sd_bus *bus,
bool offline,
unsigned threshold,
const char *root,
const char *profile,
JsonFormatFlags json_format_flags,
PagerFlags pager_flags,
AnalyzeSecurityFlags flags) {
@ -2735,7 +2773,7 @@ int analyze_security(sd_bus *bus,
assert(bus);
if (offline)
return offline_security_checks(units, policy, scope, check_man, run_generators, threshold, root, pager_flags, json_format_flags);
return offline_security_checks(units, policy, scope, check_man, run_generators, threshold, root, profile, pager_flags, json_format_flags);
if (strv_length(units) != 1) {
overview_table = table_new("unit", "exposure", "predicate", "happy");

1
src/analyze/analyze-security.h
View file

@ -24,6 +24,7 @@ int analyze_security(sd_bus *bus,
bool offline,
unsigned threshold,
const char *root,
const char *profile,
JsonFormatFlags json_format_flags,
PagerFlags pager_flags,
AnalyzeSecurityFlags flags);

25
src/analyze/analyze.c
View file

@ -105,6 +105,7 @@ static usec_t arg_base_time = USEC_INFINITY;
static char *arg_unit = NULL;
static JsonFormatFlags arg_json_format_flags = JSON_FORMAT_OFF;
static bool arg_quiet = false;
static char *arg_profile = NULL;
STATIC_DESTRUCTOR_REGISTER(arg_dot_from_patterns, strv_freep);
STATIC_DESTRUCTOR_REGISTER(arg_dot_to_patterns, strv_freep);
@ -112,6 +113,7 @@ STATIC_DESTRUCTOR_REGISTER(arg_root, freep);
STATIC_DESTRUCTOR_REGISTER(arg_image, freep);
STATIC_DESTRUCTOR_REGISTER(arg_security_policy, freep);
STATIC_DESTRUCTOR_REGISTER(arg_unit, freep);
STATIC_DESTRUCTOR_REGISTER(arg_profile, freep);
typedef struct BootTimes {
usec_t firmware_time;
@ -2423,6 +2425,7 @@ static int do_security(int argc, char *argv[], void *userdata) {
arg_offline,
arg_threshold,
arg_root,
arg_profile,
arg_json_format_flags,
arg_pager_flags,
/*flags=*/ 0);
@ -2497,6 +2500,8 @@ static int help(int argc, char *argv[], void *userdata) {
" --iterations=N Show the specified number of iterations\n"
" --base-time=TIMESTAMP Calculate calendar times relative to\n"
" specified time\n"
" --profile=name|PATH Include the specified profile in the\n"
" security review of the unit(s)\n"
" -h --help Show this help\n"
" --version Show package version\n"
" -q --quiet Do not emit hints\n"
@ -2536,6 +2541,7 @@ static int parse_argv(int argc, char *argv[]) {
ARG_THRESHOLD,
ARG_SECURITY_POLICY,
ARG_JSON,
ARG_PROFILE,
};
static const struct option options[] = {
@ -2565,6 +2571,7 @@ static int parse_argv(int argc, char *argv[]) {
{ "base-time", required_argument, NULL, ARG_BASE_TIME },
{ "unit", required_argument, NULL, 'U' },
{ "json", required_argument, NULL, ARG_JSON },
{ "profile", required_argument, NULL, ARG_PROFILE },
{}
};
@ -2713,6 +2720,24 @@ static int parse_argv(int argc, char *argv[]) {
break;
case ARG_PROFILE:
if (isempty(optarg))
return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Profile file name is empty");
if (is_path(optarg)) {
r = parse_path_argument(optarg, /* suppress_root= */ false, &arg_profile);
if (r < 0)
return r;
if (!endswith(arg_profile, ".conf"))
return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Profile file name must end with .conf: %s", arg_profile);
} else {
r = free_and_strdup(&arg_profile, optarg);
if (r < 0)
return log_oom();
}
break;
case 'U': {
_cleanup_free_ char *mangled = NULL;

13
test/units/testsuite-65.sh
View file

@ -573,7 +573,20 @@ systemd-analyze security --threshold=90 --offline=true \
--security-policy=/tmp/testfile.json \
--root=/tmp/img/ testfile.service
# The strict profile adds a lot of sanboxing options
systemd-analyze security --threshold=20 --offline=true \
--security-policy=/tmp/testfile.json \
--profile=strict \
--root=/tmp/img/ testfile.service
set +e
# The trusted profile doesn't add any sanboxing options
systemd-analyze security --threshold=20 --offline=true \
--security-policy=/tmp/testfile.json \
--profile=/usr/lib/systemd/portable/profile/trusted/service.conf \
--root=/tmp/img/ testfile.service \
&& { echo 'unexpected success'; exit 1; }
systemd-analyze security --threshold=50 --offline=true \
--security-policy=/tmp/testfile.json \
--root=/tmp/img/ testfile.service \