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creds-util: port make_credential_host_secret() over to link_tmpfile_at()

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Let's simplify things by just reusing the primitives we already have.
This commit is contained in:
Lennart Poettering 2024-03-13 12:45:22 +01:00
parent ccec206498
commit 5655e5c955
1 changed files with 14 additions and 33 deletions
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47
src/shared/creds-util.c
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@ -28,6 +28,7 @@
#include "random-util.h"
#include "sparse-endian.h"
#include "stat-util.h"
#include "tmpfile-util.h"
#include "tpm2-util.h"
#include "user-util.h"
#include "varlink.h"
@ -377,22 +378,9 @@ static int make_credential_host_secret(
assert(dfd >= 0);
assert(fn);
/* For non-root users creating a temporary file using the openat(2) over "." will fail later, in the
* linkat(2) step at the end. The reason is that linkat(2) requires the CAP_DAC_READ_SEARCH
* capability when it uses the AT_EMPTY_PATH flag. */
if (have_effective_cap(CAP_DAC_READ_SEARCH) > 0) {
fd = openat(dfd, ".", O_CLOEXEC|O_WRONLY|O_TMPFILE, 0400);
if (fd < 0)
log_debug_errno(errno, "Failed to create temporary credential file with O_TMPFILE, proceeding without: %m");
}
if (fd < 0) {
if (asprintf(&t, "credential.secret.%016" PRIx64, random_u64()) < 0)
return -ENOMEM;
fd = openat(dfd, t, O_CLOEXEC|O_WRONLY|O_CREAT|O_EXCL|O_NOFOLLOW, 0400);
if (fd < 0)
return -errno;
}
fd = open_tmpfile_linkable_at(dfd, fn, O_CLOEXEC|O_WRONLY, &t);
if (fd < 0)
return log_debug_errno(fd, "Failed to create temporary file for credential host secret: %m");
r = chattr_secret(fd, 0);
if (r < 0)
@ -412,6 +400,11 @@ static int make_credential_host_secret(
if (r < 0)
goto fail;
if (fchmod(fd, 0400) < 0) {
r = -errno;
goto fail;
}
if (fsync(fd) < 0) {
r = -errno;
goto fail;
@ -419,19 +412,9 @@ static int make_credential_host_secret(
warn_not_encrypted(fd, flags, dirname, fn);
if (t) {
r = rename_noreplace(dfd, t, dfd, fn);
if (r < 0)
goto fail;
t = mfree(t);
} else if (linkat(fd, "", dfd, fn, AT_EMPTY_PATH) < 0) {
r = -errno;
goto fail;
}
if (fsync(dfd) < 0) {
r = -errno;
r = link_tmpfile_at(fd, dfd, t, fn, LINK_TMPFILE_SYNC);
if (r < 0) {
log_debug_errno(r, "Failed to link host key into place: %m");
goto fail;
}
@ -439,10 +422,8 @@ static int make_credential_host_secret(
void *copy;
copy = memdup(buf.data, sizeof(buf.data));
if (!copy) {
r = -ENOMEM;
goto fail;
}
if (!copy)
return -ENOMEM;
*ret = IOVEC_MAKE(copy, sizeof(buf.data));
}