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/* SPDX-License-Identifier: LGPL-2.1-or-later */
#include "creds-util.h"
#include "fileio.h"
#include "format-util.h"
#include "hexdecoct.h"
#include "id128-util.h"
#include "iovec-util.h"
#include "path-util.h"
#include "rm-rf.h"
#include "tests.h"
#include "tmpfile-util.h"
#include "tpm2-util.h"
#include "user-util.h"
TEST(read_credential_strings) {
_cleanup_free_ char *x = NULL, *y = NULL, *saved = NULL, *p = NULL;
_cleanup_(rm_rf_physical_and_freep) char *tmp = NULL;
_cleanup_fclose_ FILE *f = NULL;
const char *e = getenv("CREDENTIALS_DIRECTORY");
if (e)
assert_se(saved = strdup(e));
assert_se(read_credential_strings_many("foo", &x, "bar", &y) == 0);
ASSERT_NULL(x);
ASSERT_NULL(y);
assert_se(mkdtemp_malloc(NULL, &tmp) >= 0);
assert_se(setenv("CREDENTIALS_DIRECTORY", tmp, /* override= */ true) >= 0);
assert_se(read_credential_strings_many("foo", &x, "bar", &y) == 0);
ASSERT_NULL(x);
ASSERT_NULL(y);
assert_se(p = path_join(tmp, "bar"));
assert_se(write_string_file(p, "piff", WRITE_STRING_FILE_CREATE|WRITE_STRING_FILE_AVOID_NEWLINE) >= 0);
assert_se(read_credential_strings_many("foo", &x, "bar", &y) == 0);
ASSERT_NULL(x);
ASSERT_STREQ(y, "piff");
assert_se(write_string_file(p, "paff", WRITE_STRING_FILE_TRUNCATE|WRITE_STRING_FILE_AVOID_NEWLINE) >= 0);
assert_se(read_credential_strings_many("foo", &x, "bar", &y) == 0);
ASSERT_NULL(x);
ASSERT_STREQ(y, "paff");
p = mfree(p);
assert_se(p = path_join(tmp, "foo"));
assert_se(write_string_file(p, "knurz", WRITE_STRING_FILE_CREATE|WRITE_STRING_FILE_AVOID_NEWLINE) >= 0);
assert_se(read_credential_strings_many("foo", &x, "bar", &y) >= 0);
ASSERT_STREQ(x, "knurz");
ASSERT_STREQ(y, "paff");
p = mfree(p);
assert_se(p = path_join(tmp, "bazz"));
assert_se(f = fopen(p, "w"));
assert_se(fwrite("x\0y", 1, 3, f) == 3); /* embedded NUL byte should result in EBADMSG when reading back with read_credential_strings_many() */
f = safe_fclose(f);
y = mfree(y);
assert_se(read_credential_strings_many("bazz", &x, "bar", &y) == -EBADMSG);
ASSERT_STREQ(x, "knurz");
ASSERT_STREQ(y, "paff");
if (saved)
assert_se(setenv("CREDENTIALS_DIRECTORY", saved, /* override= */ 1) >= 0);
else
assert_se(unsetenv("CREDENTIALS_DIRECTORY") >= 0);
}
TEST(credential_name_valid) {
char buf[NAME_MAX+2];
assert_se(!credential_name_valid(NULL));
assert_se(!credential_name_valid(""));
assert_se(!credential_name_valid("."));
assert_se(!credential_name_valid(".."));
assert_se(!credential_name_valid("foo/bar"));
assert_se(credential_name_valid("foo"));
memset(buf, 'x', sizeof(buf)-1);
buf[sizeof(buf)-1] = 0;
assert_se(!credential_name_valid(buf));
buf[sizeof(buf)-2] = 0;
assert_se(credential_name_valid(buf));
}
TEST(credential_glob_valid) {
char buf[NAME_MAX+2];
assert_se(!credential_glob_valid(NULL));
assert_se(!credential_glob_valid(""));
assert_se(!credential_glob_valid("."));
assert_se(!credential_glob_valid(".."));
assert_se(!credential_glob_valid("foo/bar"));
assert_se(credential_glob_valid("foo"));
assert_se(credential_glob_valid("foo*"));
assert_se(credential_glob_valid("x*"));
assert_se(credential_glob_valid("*"));
assert_se(!credential_glob_valid("?"));
assert_se(!credential_glob_valid("*a"));
assert_se(!credential_glob_valid("a?"));
assert_se(!credential_glob_valid("a[abc]"));
assert_se(!credential_glob_valid("a[abc]"));
memset(buf, 'x', sizeof(buf)-1);
buf[sizeof(buf)-1] = 0;
assert_se(!credential_glob_valid(buf));
buf[sizeof(buf)-2] = 0;
assert_se(credential_glob_valid(buf));
buf[sizeof(buf)-2] = '*';
assert_se(credential_glob_valid(buf));
}
static void test_encrypt_decrypt_with(sd_id128_t mode, uid_t uid) {
static const struct iovec plaintext = CONST_IOVEC_MAKE_STRING("this is a super secret string");
int r;
if (uid_is_valid(uid))
log_notice("Running encryption/decryption test with mode " SD_ID128_FORMAT_STR " for UID " UID_FMT ".", SD_ID128_FORMAT_VAL(mode), uid);
else
log_notice("Running encryption/decryption test with mode " SD_ID128_FORMAT_STR ".", SD_ID128_FORMAT_VAL(mode));
_cleanup_(iovec_done) struct iovec encrypted = {};
r = encrypt_credential_and_warn(
mode,
"foo",
/* timestamp= */ USEC_INFINITY,
/* not_after=*/ USEC_INFINITY,
/* tpm2_device= */ NULL,
/* tpm2_hash_pcr_mask= */ 0,
/* tpm2_pubkey_path= */ NULL,
/* tpm2_pubkey_pcr_mask= */ 0,
uid,
&plaintext,
CREDENTIAL_ALLOW_NULL,
&encrypted);
if (ERRNO_IS_NEG_MACHINE_ID_UNSET(r)) {
log_notice_errno(r, "Skipping test encryption mode " SD_ID128_FORMAT_STR ", because /etc/machine-id is not initialized.", SD_ID128_FORMAT_VAL(mode));
return;
}
if (ERRNO_IS_NEG_NOT_SUPPORTED(r)) {
log_notice_errno(r, "Skipping test encryption mode " SD_ID128_FORMAT_STR ", because encrypted credentials are not supported.", SD_ID128_FORMAT_VAL(mode));
return;
}
assert_se(r >= 0);
_cleanup_(iovec_done) struct iovec decrypted = {};
r = decrypt_credential_and_warn(
"bar",
/* validate_timestamp= */ USEC_INFINITY,
/* tpm2_device= */ NULL,
/* tpm2_signature_path= */ NULL,
uid,
&encrypted,
CREDENTIAL_ALLOW_NULL,
&decrypted);
assert_se(r == -EREMOTE); /* name didn't match */
r = decrypt_credential_and_warn(
"foo",
/* validate_timestamp= */ USEC_INFINITY,
/* tpm2_device= */ NULL,
/* tpm2_signature_path= */ NULL,
uid,
&encrypted,
CREDENTIAL_ALLOW_NULL,
&decrypted);
assert_se(r >= 0);
assert_se(iovec_memcmp(&plaintext, &decrypted) == 0);
}
static bool try_tpm2(void) {
#if HAVE_TPM2
_cleanup_(tpm2_context_unrefp) Tpm2Context *tpm2_context = NULL;
int r;
r = tpm2_context_new(/* device= */ NULL, &tpm2_context);
if (r < 0)
log_notice_errno(r, "Failed to create TPM2 context, assuming no TPM2 support or privileges: %m");
return r >= 0;
#else
return false;
#endif
}
TEST(credential_encrypt_decrypt) {
_cleanup_(rm_rf_physical_and_freep) char *d = NULL;
_cleanup_free_ char *j = NULL;
log_set_max_level(LOG_DEBUG);
test_encrypt_decrypt_with(CRED_AES256_GCM_BY_NULL, UID_INVALID);
assert_se(mkdtemp_malloc(NULL, &d) >= 0);
j = path_join(d, "secret");
assert_se(j);
const char *e = getenv("SYSTEMD_CREDENTIAL_SECRET");
_cleanup_free_ char *ec = NULL;
if (e)
assert_se(ec = strdup(e));
assert_se(setenv("SYSTEMD_CREDENTIAL_SECRET", j, true) >= 0);
test_encrypt_decrypt_with(CRED_AES256_GCM_BY_HOST, UID_INVALID);
test_encrypt_decrypt_with(CRED_AES256_GCM_BY_HOST_SCOPED, 0);
if (try_tpm2()) {
test_encrypt_decrypt_with(CRED_AES256_GCM_BY_TPM2_HMAC, UID_INVALID);
test_encrypt_decrypt_with(CRED_AES256_GCM_BY_HOST_AND_TPM2_HMAC, UID_INVALID);
test_encrypt_decrypt_with(CRED_AES256_GCM_BY_HOST_AND_TPM2_HMAC_SCOPED, 0);
}
if (ec)
assert_se(setenv("SYSTEMD_CREDENTIAL_SECRET", ec, true) >= 0);
}
TEST(mime_type_matches) {
static const sd_id128_t tags[] = {
CRED_AES256_GCM_BY_HOST,
CRED_AES256_GCM_BY_HOST_SCOPED,
CRED_AES256_GCM_BY_TPM2_HMAC,
CRED_AES256_GCM_BY_TPM2_HMAC_WITH_PK,
CRED_AES256_GCM_BY_HOST_AND_TPM2_HMAC,
CRED_AES256_GCM_BY_HOST_AND_TPM2_HMAC_SCOPED,
CRED_AES256_GCM_BY_HOST_AND_TPM2_HMAC_WITH_PK,
CRED_AES256_GCM_BY_HOST_AND_TPM2_HMAC_WITH_PK_SCOPED,
CRED_AES256_GCM_BY_NULL,
};
/* Generates the right <match/> expressions for these credentials according to the shared mime-info spec */
FOREACH_ELEMENT(t, tags) {
_cleanup_free_ char *encoded = NULL;
assert_se(base64mem(t, sizeof(sd_id128_t), &encoded) >= 0);
/* Validate that the size matches expectations for the 4/3 factor size increase (rounding up) */
assert_se(strlen(encoded) == DIV_ROUND_UP((128U / 8U), 3U) * 4U);
/* Cut off rounded string where the ID ends, but now round down to get rid of characters that might contain follow-up data */
encoded[128 / 6] = 0;
printf("<match type=\"string\" value=\"%s\" offset=\"0\"/>\n", encoded);
}
}
DEFINE_TEST_MAIN(LOG_INFO);
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