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cryptsetup: port cryptsetup's main key file logic over to read_full_file_full()

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Previously, we'd load the file with libcryptsetup's calls. Let's do that
in our own, so that we can make use of READ_FULL_FILE_CONNECT_SOCKET,
i.e. read in keys via AF_UNIX sockets, so that people can plug key
providers into our logic.

This provides functionality similar to Debian's keyscript= crypttab
option (see → #3007), as it allows key scripts to be run as socket
activated services, that have stdout connected to the activated socket.
In contrast to traditional keyscript= support this logic runs stuff out
of process however, which is beneficial, since it allows sandboxing and
similar.
This commit is contained in:
Lennart Poettering 2020-11-04 17:24:53 +01:00
parent 4d1bb8f397
commit e2c2f868b2
1 changed files with 32 additions and 5 deletions
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37
src/cryptsetup/cryptsetup.c
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@ -29,6 +29,7 @@
#include "path-util.h"
#include "pkcs11-util.h"
#include "pretty-print.h"
#include "random-util.h"
#include "string-util.h"
#include "strv.h"
@ -550,6 +551,15 @@ static int attach_tcrypt(
return 0;
}
static char *make_bindname(const char *volume) {
char *s;
if (asprintf(&s, "@%" PRIx64"/cryptsetup/%s", random_u64(), volume) < 0)
return NULL;
return s;
}
static int attach_luks_or_plain_or_bitlk(
struct crypt_device *cd,
const char *name,
@ -736,13 +746,30 @@ static int attach_luks_or_plain_or_bitlk(
return log_error_errno(r, "Failed to activate: %m");
} else if (key_file) {
r = crypt_activate_by_keyfile_device_offset(cd, name, arg_key_slot, key_file, arg_keyfile_size, arg_keyfile_offset, flags);
if (r == -EPERM) {
log_error_errno(r, "Failed to activate with key file '%s'. (Key data incorrect?)", key_file);
_cleanup_(erase_and_freep) char *kfdata = NULL;
_cleanup_free_ char *bindname = NULL;
size_t kfsize;
/* If we read the key via AF_UNIX, make this client recognizable */
bindname = make_bindname(name);
if (!bindname)
return log_oom();
r = read_full_file_full(
AT_FDCWD, key_file,
arg_keyfile_offset == 0 ? UINT64_MAX : arg_keyfile_offset,
arg_keyfile_size == 0 ? SIZE_MAX : arg_keyfile_size,
READ_FULL_FILE_SECURE|READ_FULL_FILE_WARN_WORLD_READABLE|READ_FULL_FILE_CONNECT_SOCKET,
bindname,
&kfdata, &kfsize);
if (r == -ENOENT) {
log_error_errno(r, "Failed to activate, key file '%s' missing.", key_file);
return -EAGAIN; /* Log actual error, but return EAGAIN */
}
if (r == -EINVAL) {
log_error_errno(r, "Failed to activate with key file '%s'. (Key file missing?)", key_file);
r = crypt_activate_by_passphrase(cd, name, arg_key_slot, kfdata, kfsize, flags);
if (r == -EPERM) {
log_error_errno(r, "Failed to activate with key file '%s'. (Key data incorrect?)", key_file);
return -EAGAIN; /* Log actual error, but return EAGAIN */
}
if (r < 0)