644 lines
23 KiB
C
644 lines
23 KiB
C
/* SPDX-License-Identifier: LGPL-2.1+ */
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#include <linux/fs.h>
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#include <openssl/evp.h>
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#include <openssl/sha.h>
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#include <sys/ioctl.h>
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#include <sys/xattr.h>
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#include "errno-util.h"
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#include "fd-util.h"
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#include "hexdecoct.h"
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#include "homework-fscrypt.h"
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#include "homework-quota.h"
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#include "memory-util.h"
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#include "missing_keyctl.h"
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#include "missing_syscall.h"
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#include "mkdir.h"
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#include "nulstr-util.h"
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#include "openssl-util.h"
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#include "parse-util.h"
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#include "process-util.h"
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#include "random-util.h"
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#include "rm-rf.h"
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#include "stdio-util.h"
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#include "strv.h"
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#include "tmpfile-util.h"
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#include "user-util.h"
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#include "xattr-util.h"
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static int fscrypt_upload_volume_key(
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const uint8_t key_descriptor[static FS_KEY_DESCRIPTOR_SIZE],
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const void *volume_key,
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size_t volume_key_size,
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key_serial_t where) {
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_cleanup_free_ char *hex = NULL;
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const char *description;
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struct fscrypt_key key;
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key_serial_t serial;
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assert(key_descriptor);
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assert(volume_key);
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assert(volume_key_size > 0);
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if (volume_key_size > sizeof(key.raw))
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return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Volume key too long.");
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hex = hexmem(key_descriptor, FS_KEY_DESCRIPTOR_SIZE);
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if (!hex)
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return log_oom();
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description = strjoina("fscrypt:", hex);
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key = (struct fscrypt_key) {
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.size = volume_key_size,
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};
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memcpy(key.raw, volume_key, volume_key_size);
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/* Upload to the kernel */
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serial = add_key("logon", description, &key, sizeof(key), where);
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explicit_bzero_safe(&key, sizeof(key));
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if (serial < 0)
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return log_error_errno(errno, "Failed to install master key in keyring: %m");
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log_info("Uploaded encryption key to kernel.");
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return 0;
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}
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static void calculate_key_descriptor(
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const void *key,
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size_t key_size,
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uint8_t ret_key_descriptor[static FS_KEY_DESCRIPTOR_SIZE]) {
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uint8_t hashed[512 / 8] = {}, hashed2[512 / 8] = {};
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/* Derive the key descriptor from the volume key via double SHA512, in order to be compatible with e4crypt */
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assert_se(SHA512(key, key_size, hashed) == hashed);
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assert_se(SHA512(hashed, sizeof(hashed), hashed2) == hashed2);
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assert_cc(sizeof(hashed2) >= FS_KEY_DESCRIPTOR_SIZE);
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memcpy(ret_key_descriptor, hashed2, FS_KEY_DESCRIPTOR_SIZE);
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}
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static int fscrypt_slot_try_one(
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const char *password,
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const void *salt, size_t salt_size,
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const void *encrypted, size_t encrypted_size,
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const uint8_t match_key_descriptor[static FS_KEY_DESCRIPTOR_SIZE],
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void **ret_decrypted, size_t *ret_decrypted_size) {
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_cleanup_(EVP_CIPHER_CTX_freep) EVP_CIPHER_CTX *context = NULL;
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_cleanup_(erase_and_freep) void *decrypted = NULL;
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uint8_t key_descriptor[FS_KEY_DESCRIPTOR_SIZE];
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int decrypted_size_out1, decrypted_size_out2;
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uint8_t derived[512 / 8] = {};
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size_t decrypted_size;
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const EVP_CIPHER *cc;
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int r;
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assert(password);
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assert(salt);
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assert(salt_size > 0);
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assert(encrypted);
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assert(encrypted_size > 0);
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assert(match_key_descriptor);
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/* Our construction is like this:
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*
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* 1. In each key slot we store a salt value plus the encrypted volume key
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*
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* 2. Unlocking is via calculating PBKDF2-HMAC-SHA512 of the supplied password (in combination with
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* the salt), then using the first 256 bit of the hash as key for decrypting the encrypted
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* volume key in AES256 counter mode.
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*
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* 3. Writing a password is similar: calculate PBKDF2-HMAC-SHA512 of the supplied password (in
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* combination with the salt), then encrypt the volume key in AES256 counter mode with the
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* resulting hash.
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*/
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if (PKCS5_PBKDF2_HMAC(
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password, strlen(password),
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salt, salt_size,
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0xFFFF, EVP_sha512(),
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sizeof(derived), derived) != 1) {
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r = log_error_errno(SYNTHETIC_ERRNO(ENOTRECOVERABLE), "PBKDF2 failed");
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goto finish;
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}
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context = EVP_CIPHER_CTX_new();
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if (!context) {
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r = log_oom();
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goto finish;
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}
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/* We use AES256 in counter mode */
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assert_se(cc = EVP_aes_256_ctr());
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/* We only use the first half of the derived key */
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assert(sizeof(derived) >= (size_t) EVP_CIPHER_key_length(cc));
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if (EVP_DecryptInit_ex(context, cc, NULL, derived, NULL) != 1) {
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r = log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Failed to initialize decryption context.");
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goto finish;
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}
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/* Flush out the derived key now, we don't need it anymore */
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explicit_bzero_safe(derived, sizeof(derived));
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decrypted_size = encrypted_size + EVP_CIPHER_key_length(cc) * 2;
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decrypted = malloc(decrypted_size);
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if (!decrypted)
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return log_oom();
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if (EVP_DecryptUpdate(context, (uint8_t*) decrypted, &decrypted_size_out1, encrypted, encrypted_size) != 1)
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return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Failed to decrypt volume key.");
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assert((size_t) decrypted_size_out1 <= decrypted_size);
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if (EVP_DecryptFinal_ex(context, (uint8_t*) decrypted_size + decrypted_size_out1, &decrypted_size_out2) != 1)
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return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Failed to finish decryption of volume key.");
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assert((size_t) decrypted_size_out1 + (size_t) decrypted_size_out2 < decrypted_size);
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decrypted_size = (size_t) decrypted_size_out1 + (size_t) decrypted_size_out2;
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calculate_key_descriptor(decrypted, decrypted_size, key_descriptor);
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if (memcmp(key_descriptor, match_key_descriptor, FS_KEY_DESCRIPTOR_SIZE) != 0)
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return -ENOANO; /* don't log here */
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r = fscrypt_upload_volume_key(key_descriptor, decrypted, decrypted_size, KEY_SPEC_THREAD_KEYRING);
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if (r < 0)
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return r;
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if (ret_decrypted)
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*ret_decrypted = TAKE_PTR(decrypted);
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if (ret_decrypted_size)
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*ret_decrypted_size = decrypted_size;
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return 0;
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finish:
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explicit_bzero_safe(derived, sizeof(derived));
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return r;
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}
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static int fscrypt_slot_try_many(
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char **passwords,
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const void *salt, size_t salt_size,
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const void *encrypted, size_t encrypted_size,
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const uint8_t match_key_descriptor[static FS_KEY_DESCRIPTOR_SIZE],
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void **ret_decrypted, size_t *ret_decrypted_size) {
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char **i;
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int r;
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STRV_FOREACH(i, passwords) {
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r = fscrypt_slot_try_one(*i, salt, salt_size, encrypted, encrypted_size, match_key_descriptor, ret_decrypted, ret_decrypted_size);
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if (r != -ENOANO)
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return r;
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}
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return -ENOANO;
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}
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static int fscrypt_setup(
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const PasswordCache *cache,
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char **password,
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HomeSetup *setup,
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void **ret_volume_key,
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size_t *ret_volume_key_size) {
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_cleanup_free_ char *xattr_buf = NULL;
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const char *xa;
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int r;
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assert(setup);
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assert(setup->root_fd >= 0);
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r = flistxattr_malloc(setup->root_fd, &xattr_buf);
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if (r < 0)
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return log_error_errno(errno, "Failed to retrieve xattr list: %m");
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NULSTR_FOREACH(xa, xattr_buf) {
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_cleanup_free_ void *salt = NULL, *encrypted = NULL;
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_cleanup_free_ char *value = NULL;
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size_t salt_size, encrypted_size;
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const char *nr, *e;
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char **list;
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int n;
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/* Check if this xattr has the format 'trusted.fscrypt_slot<nr>' where '<nr>' is a 32bit unsigned integer */
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nr = startswith(xa, "trusted.fscrypt_slot");
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if (!nr)
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continue;
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if (safe_atou32(nr, NULL) < 0)
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continue;
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n = fgetxattr_malloc(setup->root_fd, xa, &value);
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if (n == -ENODATA) /* deleted by now? */
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continue;
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if (n < 0)
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return log_error_errno(n, "Failed to read %s xattr: %m", xa);
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e = memchr(value, ':', n);
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if (!e)
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return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "xattr %s lacks ':' separator: %m", xa);
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r = unbase64mem(value, e - value, &salt, &salt_size);
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if (r < 0)
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return log_error_errno(r, "Failed to decode salt of %s: %m", xa);
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r = unbase64mem(e+1, n - (e - value) - 1, &encrypted, &encrypted_size);
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if (r < 0)
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return log_error_errno(r, "Failed to decode encrypted key of %s: %m", xa);
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r = -ENOANO;
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FOREACH_POINTER(list, cache->pkcs11_passwords, cache->fido2_passwords, password) {
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r = fscrypt_slot_try_many(
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list,
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salt, salt_size,
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encrypted, encrypted_size,
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setup->fscrypt_key_descriptor,
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ret_volume_key, ret_volume_key_size);
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if (r != -ENOANO)
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break;
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}
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if (r < 0) {
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if (r != -ENOANO)
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return r;
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} else
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return 0;
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}
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return log_error_errno(SYNTHETIC_ERRNO(ENOKEY), "Failed to set up home directory with provided passwords.");
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}
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int home_prepare_fscrypt(
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UserRecord *h,
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bool already_activated,
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PasswordCache *cache,
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HomeSetup *setup) {
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_cleanup_(erase_and_freep) void *volume_key = NULL;
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struct fscrypt_policy policy = {};
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size_t volume_key_size = 0;
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const char *ip;
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int r;
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assert(h);
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assert(setup);
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assert(user_record_storage(h) == USER_FSCRYPT);
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assert_se(ip = user_record_image_path(h));
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setup->root_fd = open(ip, O_RDONLY|O_CLOEXEC|O_DIRECTORY);
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if (setup->root_fd < 0)
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return log_error_errno(errno, "Failed to open home directory: %m");
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if (ioctl(setup->root_fd, FS_IOC_GET_ENCRYPTION_POLICY, &policy) < 0) {
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if (errno == ENODATA)
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return log_error_errno(errno, "Home directory %s is not encrypted.", ip);
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if (ERRNO_IS_NOT_SUPPORTED(errno)) {
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log_error_errno(errno, "File system does not support fscrypt: %m");
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return -ENOLINK; /* make recognizable */
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}
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return log_error_errno(errno, "Failed to acquire encryption policy of %s: %m", ip);
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}
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memcpy(setup->fscrypt_key_descriptor, policy.master_key_descriptor, FS_KEY_DESCRIPTOR_SIZE);
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r = fscrypt_setup(
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cache,
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h->password,
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setup,
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&volume_key,
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&volume_key_size);
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if (r < 0)
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return r;
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/* Also install the access key in the user's own keyring */
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if (uid_is_valid(h->uid)) {
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r = safe_fork("(sd-addkey)", FORK_RESET_SIGNALS|FORK_CLOSE_ALL_FDS|FORK_DEATHSIG|FORK_LOG|FORK_WAIT, NULL);
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if (r < 0)
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return log_error_errno(r, "Failed install encryption key in user's keyring: %m");
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if (r == 0) {
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gid_t gid;
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/* Child */
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gid = user_record_gid(h);
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if (setresgid(gid, gid, gid) < 0) {
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log_error_errno(errno, "Failed to change GID to " GID_FMT ": %m", gid);
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_exit(EXIT_FAILURE);
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}
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if (setgroups(0, NULL) < 0) {
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log_error_errno(errno, "Failed to reset auxiliary groups list: %m");
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_exit(EXIT_FAILURE);
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}
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if (setresuid(h->uid, h->uid, h->uid) < 0) {
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log_error_errno(errno, "Failed to change UID to " UID_FMT ": %m", h->uid);
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_exit(EXIT_FAILURE);
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}
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r = fscrypt_upload_volume_key(
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setup->fscrypt_key_descriptor,
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volume_key,
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volume_key_size,
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KEY_SPEC_USER_KEYRING);
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if (r < 0)
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_exit(EXIT_FAILURE);
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_exit(EXIT_SUCCESS);
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}
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}
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return 0;
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}
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static int fscrypt_slot_set(
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int root_fd,
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const void *volume_key,
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size_t volume_key_size,
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const char *password,
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uint32_t nr) {
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_cleanup_free_ char *salt_base64 = NULL, *encrypted_base64 = NULL, *joined = NULL;
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char label[STRLEN("trusted.fscrypt_slot") + DECIMAL_STR_MAX(nr) + 1];
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_cleanup_(EVP_CIPHER_CTX_freep) EVP_CIPHER_CTX *context = NULL;
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int r, encrypted_size_out1, encrypted_size_out2;
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uint8_t salt[64], derived[512 / 8] = {};
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_cleanup_free_ void *encrypted = NULL;
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const EVP_CIPHER *cc;
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size_t encrypted_size;
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r = genuine_random_bytes(salt, sizeof(salt), RANDOM_BLOCK);
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if (r < 0)
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return log_error_errno(r, "Failed to generate salt: %m");
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if (PKCS5_PBKDF2_HMAC(
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password, strlen(password),
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salt, sizeof(salt),
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0xFFFF, EVP_sha512(),
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sizeof(derived), derived) != 1) {
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r = log_error_errno(SYNTHETIC_ERRNO(ENOTRECOVERABLE), "PBKDF2 failed");
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goto finish;
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}
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context = EVP_CIPHER_CTX_new();
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if (!context) {
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r = log_oom();
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goto finish;
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}
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/* We use AES256 in counter mode */
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cc = EVP_aes_256_ctr();
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/* We only use the first half of the derived key */
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assert(sizeof(derived) >= (size_t) EVP_CIPHER_key_length(cc));
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if (EVP_EncryptInit_ex(context, cc, NULL, derived, NULL) != 1) {
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r = log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Failed to initialize encryption context.");
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goto finish;
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}
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/* Flush out the derived key now, we don't need it anymore */
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explicit_bzero_safe(derived, sizeof(derived));
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encrypted_size = volume_key_size + EVP_CIPHER_key_length(cc) * 2;
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encrypted = malloc(encrypted_size);
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if (!encrypted)
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return log_oom();
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if (EVP_EncryptUpdate(context, (uint8_t*) encrypted, &encrypted_size_out1, volume_key, volume_key_size) != 1)
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return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Failed to encrypt volume key.");
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assert((size_t) encrypted_size_out1 <= encrypted_size);
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if (EVP_EncryptFinal_ex(context, (uint8_t*) encrypted_size + encrypted_size_out1, &encrypted_size_out2) != 1)
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return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Failed to finish encryption of volume key.");
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assert((size_t) encrypted_size_out1 + (size_t) encrypted_size_out2 < encrypted_size);
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encrypted_size = (size_t) encrypted_size_out1 + (size_t) encrypted_size_out2;
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r = base64mem(salt, sizeof(salt), &salt_base64);
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if (r < 0)
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return log_oom();
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r = base64mem(encrypted, encrypted_size, &encrypted_base64);
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if (r < 0)
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return log_oom();
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joined = strjoin(salt_base64, ":", encrypted_base64);
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if (!joined)
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return log_oom();
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xsprintf(label, "trusted.fscrypt_slot%" PRIu32, nr);
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if (fsetxattr(root_fd, label, joined, strlen(joined), 0) < 0)
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return log_error_errno(errno, "Failed to write xattr %s: %m", label);
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log_info("Written key slot %s.", label);
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return 0;
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finish:
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explicit_bzero_safe(derived, sizeof(derived));
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return r;
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}
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int home_create_fscrypt(
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UserRecord *h,
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char **effective_passwords,
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UserRecord **ret_home) {
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_cleanup_(rm_rf_physical_and_freep) char *temporary = NULL;
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_cleanup_(user_record_unrefp) UserRecord *new_home = NULL;
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_cleanup_(erase_and_freep) void *volume_key = NULL;
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struct fscrypt_policy policy = {};
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size_t volume_key_size = 512 / 8;
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_cleanup_close_ int root_fd = -1;
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_cleanup_free_ char *d = NULL;
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uint32_t nr = 0;
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const char *ip;
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char **i;
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int r;
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assert(h);
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assert(user_record_storage(h) == USER_FSCRYPT);
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assert(ret_home);
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assert_se(ip = user_record_image_path(h));
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r = tempfn_random(ip, "homework", &d);
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if (r < 0)
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return log_error_errno(r, "Failed to allocate temporary directory: %m");
|
|
|
|
(void) mkdir_parents(d, 0755);
|
|
|
|
if (mkdir(d, 0700) < 0)
|
|
return log_error_errno(errno, "Failed to create temporary home directory %s: %m", d);
|
|
|
|
temporary = TAKE_PTR(d); /* Needs to be destroyed now */
|
|
|
|
root_fd = open(temporary, O_RDONLY|O_CLOEXEC|O_DIRECTORY|O_NOFOLLOW);
|
|
if (root_fd < 0)
|
|
return log_error_errno(errno, "Failed to open temporary home directory: %m");
|
|
|
|
if (ioctl(root_fd, FS_IOC_GET_ENCRYPTION_POLICY, &policy) < 0) {
|
|
if (ERRNO_IS_NOT_SUPPORTED(errno)) {
|
|
log_error_errno(errno, "File system does not support fscrypt: %m");
|
|
return -ENOLINK; /* make recognizable */
|
|
}
|
|
if (errno != ENODATA)
|
|
return log_error_errno(errno, "Failed to get fscrypt policy of directory: %m");
|
|
} else
|
|
return log_error_errno(SYNTHETIC_ERRNO(EBUSY), "Parent of %s already encrypted, refusing.", d);
|
|
|
|
volume_key = malloc(volume_key_size);
|
|
if (!volume_key)
|
|
return log_oom();
|
|
|
|
r = genuine_random_bytes(volume_key, volume_key_size, RANDOM_BLOCK);
|
|
if (r < 0)
|
|
return log_error_errno(r, "Failed to acquire volume key: %m");
|
|
|
|
log_info("Generated volume key of size %zu.", volume_key_size);
|
|
|
|
policy = (struct fscrypt_policy) {
|
|
.contents_encryption_mode = FS_ENCRYPTION_MODE_AES_256_XTS,
|
|
.filenames_encryption_mode = FS_ENCRYPTION_MODE_AES_256_CTS,
|
|
.flags = FS_POLICY_FLAGS_PAD_32,
|
|
};
|
|
|
|
calculate_key_descriptor(volume_key, volume_key_size, policy.master_key_descriptor);
|
|
|
|
r = fscrypt_upload_volume_key(policy.master_key_descriptor, volume_key, volume_key_size, KEY_SPEC_THREAD_KEYRING);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
log_info("Uploaded volume key to kernel.");
|
|
|
|
if (ioctl(root_fd, FS_IOC_SET_ENCRYPTION_POLICY, &policy) < 0)
|
|
return log_error_errno(errno, "Failed to set fscrypt policy on directory: %m");
|
|
|
|
log_info("Encryption policy set.");
|
|
|
|
STRV_FOREACH(i, effective_passwords) {
|
|
r = fscrypt_slot_set(root_fd, volume_key, volume_key_size, *i, nr);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
nr++;
|
|
}
|
|
|
|
(void) home_update_quota_classic(h, temporary);
|
|
|
|
r = home_populate(h, root_fd);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
r = home_sync_and_statfs(root_fd, NULL);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
r = user_record_clone(h, USER_RECORD_LOAD_MASK_SECRET, &new_home);
|
|
if (r < 0)
|
|
return log_error_errno(r, "Failed to clone record: %m");
|
|
|
|
r = user_record_add_binding(
|
|
new_home,
|
|
USER_FSCRYPT,
|
|
ip,
|
|
SD_ID128_NULL,
|
|
SD_ID128_NULL,
|
|
SD_ID128_NULL,
|
|
NULL,
|
|
NULL,
|
|
UINT64_MAX,
|
|
NULL,
|
|
NULL,
|
|
h->uid,
|
|
(gid_t) h->uid);
|
|
if (r < 0)
|
|
return log_error_errno(r, "Failed to add binding to record: %m");
|
|
|
|
if (rename(temporary, ip) < 0)
|
|
return log_error_errno(errno, "Failed to rename %s to %s: %m", temporary, ip);
|
|
|
|
temporary = mfree(temporary);
|
|
|
|
log_info("Everything completed.");
|
|
|
|
*ret_home = TAKE_PTR(new_home);
|
|
return 0;
|
|
}
|
|
|
|
int home_passwd_fscrypt(
|
|
UserRecord *h,
|
|
HomeSetup *setup,
|
|
PasswordCache *cache, /* the passwords acquired via PKCS#11/FIDO2 security tokens */
|
|
char **effective_passwords /* new passwords */) {
|
|
|
|
_cleanup_(erase_and_freep) void *volume_key = NULL;
|
|
_cleanup_free_ char *xattr_buf = NULL;
|
|
size_t volume_key_size = 0;
|
|
uint32_t slot = 0;
|
|
const char *xa;
|
|
char **p;
|
|
int r;
|
|
|
|
assert(h);
|
|
assert(user_record_storage(h) == USER_FSCRYPT);
|
|
assert(setup);
|
|
|
|
r = fscrypt_setup(
|
|
cache,
|
|
h->password,
|
|
setup,
|
|
&volume_key,
|
|
&volume_key_size);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
STRV_FOREACH(p, effective_passwords) {
|
|
r = fscrypt_slot_set(setup->root_fd, volume_key, volume_key_size, *p, slot);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
slot++;
|
|
}
|
|
|
|
r = flistxattr_malloc(setup->root_fd, &xattr_buf);
|
|
if (r < 0)
|
|
return log_error_errno(errno, "Failed to retrieve xattr list: %m");
|
|
|
|
NULSTR_FOREACH(xa, xattr_buf) {
|
|
const char *nr;
|
|
uint32_t z;
|
|
|
|
/* Check if this xattr has the format 'trusted.fscrypt_slot<nr>' where '<nr>' is a 32bit unsigned integer */
|
|
nr = startswith(xa, "trusted.fscrypt_slot");
|
|
if (!nr)
|
|
continue;
|
|
if (safe_atou32(nr, &z) < 0)
|
|
continue;
|
|
|
|
if (z < slot)
|
|
continue;
|
|
|
|
if (fremovexattr(setup->root_fd, xa) < 0)
|
|
|
|
if (errno != ENODATA)
|
|
log_warning_errno(errno, "Failed to remove xattr %s: %m", xa);
|
|
}
|
|
|
|
return 0;
|
|
}
|