#include <sys/xattr.h>

#include <linux/fs.h>

#include <sys/prctl.h>

#include <curl/curl.h>

#include <gcrypt.h>

#include "utf8.h"

#include "strv.h"

#include "copy.h"

#include "btrfs-util.h"

#include "util.h"

#include "macro.h"

#include "mkdir.h"

#include "curl-util.h"

#include "qcow2-util.h"

#include "import-job.h"

#include "import-util.h"

#include "import-raw.h"

typedef struct RawImportFile RawImportFile;

struct RawImport {

sd_event *event;

CurlGlue *glue;

char *image_root;

ImportJob *raw_job;

ImportJob *sha256sums_job;

ImportJob *signature_job;

RawImportFinished on_finished;

void *userdata;

char *local;

bool force_local;

char *temp_path;

char *final_path;

ImportVerify verify;

};

RawImport* raw_import_unref(RawImport *i) {

if (!i)

return NULL;

import_job_unref(i->raw_job);

import_job_unref(i->sha256sums_job);

import_job_unref(i->signature_job);

curl_glue_unref(i->glue);

sd_event_unref(i->event);

if (i->temp_path) {

(void) unlink(i->temp_path);

free(i->temp_path);

}

free(i->final_path);

free(i->image_root);

free(i->local);

free(i);

return NULL;

}

int raw_import_new(RawImport **ret, sd_event *event, const char *image_root, RawImportFinished on_finished, void *userdata) {

_cleanup_(raw_import_unrefp) RawImport *i = NULL;

int r;

assert(ret);

i = new0(RawImport, 1);

if (!i)

return -ENOMEM;

i->on_finished = on_finished;

i->userdata = userdata;

i->image_root = strdup(image_root ?: "/var/lib/machines");

if (!i->image_root)

return -ENOMEM;

if (event)

i->event = sd_event_ref(event);

else {

r = sd_event_default(&i->event);

if (r < 0)

return r;

}

r = curl_glue_new(&i->glue, i->event);

if (r < 0)

return r;

i->glue->on_finished = import_job_curl_on_finished;

i->glue->userdata = i;

*ret = i;

i = NULL;

return 0;

}

static int raw_import_maybe_convert_qcow2(RawImport *i) {

_cleanup_close_ int converted_fd = -1;

_cleanup_free_ char *t = NULL;

int r;

assert(i);

assert(i->raw_job);

r = qcow2_detect(i->raw_job->disk_fd);

if (r < 0)

return log_error_errno(r, "Failed to detect whether this is a QCOW2 image: %m");

if (r == 0)

return 0;

/* This is a QCOW2 image, let's convert it */

r = tempfn_random(i->final_path, &t);

if (r < 0)

return log_oom();

converted_fd = open(t, O_RDWR|O_CREAT|O_EXCL|O_NOCTTY|O_CLOEXEC, 0644);

if (converted_fd < 0)

return log_error_errno(errno, "Failed to create %s: %m", t);

r = chattr_fd(converted_fd, true, FS_NOCOW_FL);

if (r < 0)

log_warning_errno(errno, "Failed to set file attributes on %s: %m", t);

log_info("Unpacking QCOW2 file.");

r = qcow2_convert(i->raw_job->disk_fd, converted_fd);

if (r < 0) {

unlink(t);

return log_error_errno(r, "Failed to convert qcow2 image: %m");

}

unlink(i->temp_path);

free(i->temp_path);

i->temp_path = t;

t = NULL;

safe_close(i->raw_job->disk_fd);

i->raw_job->disk_fd = converted_fd;

converted_fd = -1;

return 1;

}

static int raw_import_make_local_copy(RawImport *i) {

_cleanup_free_ char *tp = NULL;

_cleanup_close_ int dfd = -1;

const char *p;

int r;

assert(i);

assert(i->raw_job);

if (!i->local)

return 0;

if (i->raw_job->etag_exists) {

/* We have downloaded this one previously, reopen it */

assert(i->raw_job->disk_fd < 0);

if (!i->final_path) {

r = import_make_path(i->raw_job->url, i->raw_job->etag, i->image_root, ".raw-", ".raw", &i->final_path);

if (r < 0)

return log_oom();

}

i->raw_job->disk_fd = open(i->final_path, O_RDONLY|O_NOCTTY|O_CLOEXEC);

if (i->raw_job->disk_fd < 0)

return log_error_errno(errno, "Failed to open vendor image: %m");

} else {

/* We freshly downloaded the image, use it */

assert(i->raw_job->disk_fd >= 0);

if (lseek(i->raw_job->disk_fd, SEEK_SET, 0) == (off_t) -1)

return log_error_errno(errno, "Failed to seek to beginning of vendor image: %m");

}

p = strappenda(i->image_root, "/", i->local, ".raw");

if (i->force_local) {

(void) btrfs_subvol_remove(p);

(void) rm_rf_dangerous(p, false, true, false);

}

r = tempfn_random(p, &tp);

if (r < 0)

return log_oom();

dfd = open(tp, O_WRONLY|O_CREAT|O_EXCL|O_NOCTTY|O_CLOEXEC, 0664);

if (dfd < 0)

return log_error_errno(errno, "Failed to create writable copy of image: %m");

/* Turn off COW writing. This should greatly improve

r = chattr_fd(dfd, true, FS_NOCOW_FL);

if (r < 0)

log_warning_errno(errno, "Failed to set file attributes on %s: %m", tp);

r = copy_bytes(i->raw_job->disk_fd, dfd, (off_t) -1, true);

if (r < 0) {

unlink(tp);

return log_error_errno(r, "Failed to make writable copy of image: %m");

}

(void) copy_times(i->raw_job->disk_fd, dfd);

(void) copy_xattr(i->raw_job->disk_fd, dfd);

dfd = safe_close(dfd);

r = rename(tp, p);

if (r < 0) {

unlink(tp);

return log_error_errno(errno, "Failed to move writable image into place: %m");

}

log_info("Created new local image '%s'.", i->local);

return 0;

}

static int raw_import_verify_sha256sum(RawImport *i) {

_cleanup_close_pair_ int gpg_pipe[2] = { -1, -1 };

_cleanup_free_ char *fn = NULL;

_cleanup_close_ int sig_file = -1;

const char *p, *line;

char sig_file_path[] = "/tmp/sigXXXXXX";

_cleanup_sigkill_wait_ pid_t pid = 0;

int r;

assert(i);

assert(i->raw_job);

if (!i->sha256sums_job)

return 0;

assert(i->raw_job->state == IMPORT_JOB_DONE);

assert(i->raw_job->sha256);

assert(i->sha256sums_job->state == IMPORT_JOB_DONE);

assert(i->sha256sums_job->payload);

assert(i->sha256sums_job->payload_size > 0);

r = import_url_last_component(i->raw_job->url, &fn);

if (r < 0)

return log_oom();

if (!filename_is_valid(fn)) {

log_error("Cannot verify checksum, could not determine valid server-side file name.");

return -EBADMSG;

}

line = strappenda(i->raw_job->sha256, " *", fn, "\n");

p = memmem(i->sha256sums_job->payload,

i->sha256sums_job->payload_size,

line,

strlen(line));

if (!p || (p != (char*) i->sha256sums_job->payload && p[-1] != '\n')) {

log_error("Checksum did not check out, payload has been tempered with.");

return -EBADMSG;

}

log_info("SHA256 checksum of %s is valid.", i->raw_job->url);

if (!i->signature_job)

return 0;

assert(i->signature_job->state == IMPORT_JOB_DONE);

assert(i->signature_job->payload);

assert(i->signature_job->payload_size > 0);

r = pipe2(gpg_pipe, O_CLOEXEC);

if (r < 0)

return log_error_errno(errno, "Failed to create pipe: %m");

sig_file = mkostemp(sig_file_path, O_RDWR);

if (sig_file < 0)

return log_error_errno(errno, "Failed to create temporary file: %m");

r = loop_write(sig_file, i->signature_job->payload, i->signature_job->payload_size, false);

if (r < 0) {

log_error_errno(r, "Failed to write to temporary file: %m");

goto finish;

}

pid = fork();

if (pid < 0)

return log_error_errno(errno, "Failed to fork off gpg: %m");

if (pid == 0) {

const char *cmd[] = {

"gpg",

"--no-options",

"--no-default-keyring",

"--no-auto-key-locate",

"--no-auto-check-trustdb",

"--batch",

"--trust-model=always",

"--keyring=" VENDOR_KEYRING_PATH,

NULL, /* maybe user keyring */

NULL, /* --verify */

NULL, /* signature file */

NULL, /* dash */

NULL /* trailing NULL */

};

unsigned k = ELEMENTSOF(cmd) - 5;

int null_fd;

/* Child */

reset_all_signal_handlers();

reset_signal_mask();

assert_se(prctl(PR_SET_PDEATHSIG, SIGTERM) == 0);

gpg_pipe[1] = safe_close(gpg_pipe[1]);

if (dup2(gpg_pipe[0], STDIN_FILENO) != STDIN_FILENO) {

log_error_errno(errno, "Failed to dup2() fd: %m");

_exit(EXIT_FAILURE);

}

if (gpg_pipe[0] != STDIN_FILENO)

gpg_pipe[0] = safe_close(gpg_pipe[0]);

null_fd = open("/dev/null", O_WRONLY|O_NOCTTY);

if (null_fd < 0) {

log_error_errno(errno, "Failed to open /dev/null: %m");

_exit(EXIT_FAILURE);

}

if (dup2(null_fd, STDOUT_FILENO) != STDOUT_FILENO) {

log_error_errno(errno, "Failed to dup2() fd: %m");

_exit(EXIT_FAILURE);

}

if (null_fd != STDOUT_FILENO)

null_fd = safe_close(null_fd);

/* We add the user keyring only to the command line

if (access(USER_KEYRING_PATH, F_OK) >= 0)

cmd[k++] = "--keyring=" USER_KEYRING_PATH;

cmd[k++] = "--verify";

cmd[k++] = sig_file_path;

cmd[k++] = "-";

cmd[k++] = NULL;

execvp("gpg", (char * const *) cmd);

log_error_errno(errno, "Failed to execute gpg: %m");

_exit(EXIT_FAILURE);

}

gpg_pipe[0] = safe_close(gpg_pipe[0]);

r = loop_write(gpg_pipe[1], i->sha256sums_job->payload, i->sha256sums_job->payload_size, false);

if (r < 0) {

log_error_errno(r, "Failed to write to pipe: %m");

goto finish;

}

gpg_pipe[1] = safe_close(gpg_pipe[1]);

r = wait_for_terminate_and_warn("gpg", pid, true);

pid = 0;

if (r < 0)

goto finish;

if (r > 0) {

log_error("Signature verification failed.");

r = -EBADMSG;

} else {

log_info("Signature verification succeeded.");

r = 0;

}

finish:

if (sig_file >= 0)

unlink(sig_file_path);

return r;

}

static void raw_import_job_on_finished(ImportJob *j) {

RawImport *i;

int r;

assert(j);

assert(j->userdata);

i = j->userdata;

if (j->error != 0) {

if (j == i->sha256sums_job)

log_error_errno(j->error, "Failed to retrieve SHA256 checksum, cannot verify. (Try --verify=no?)");

else if (j == i->signature_job)

log_error_errno(j->error, "Failed to retrieve signature file, cannot verify. (Try --verify=no?)");

else

log_error_errno(j->error, "Failed to retrieve image file. (Wrong URL?)");

r = j->error;

goto finish;

}

/* This is invoked if either the download completed

if (!IMPORT_JOB_STATE_IS_COMPLETE(i->raw_job))

return;

if (i->sha256sums_job && !IMPORT_JOB_STATE_IS_COMPLETE(i->sha256sums_job))

return;

if (i->signature_job && !IMPORT_JOB_STATE_IS_COMPLETE(i->signature_job))

return;

if (!i->raw_job->etag_exists) {

assert(i->raw_job->disk_fd >= 0);

r = raw_import_verify_sha256sum(i);

if (r < 0)

goto finish;

r = raw_import_maybe_convert_qcow2(i);

if (r < 0)

goto finish;

r = import_make_read_only_fd(i->raw_job->disk_fd);

if (r < 0)

goto finish;

r = rename(i->temp_path, i->final_path);

if (r < 0) {

r = log_error_errno(errno, "Failed to move RAW file into place: %m");

goto finish;

}

free(i->temp_path);

i->temp_path = NULL;

}

r = raw_import_make_local_copy(i);

if (r < 0)

goto finish;

r = 0;

finish:

if (i->on_finished)

i->on_finished(i, r, i->userdata);

else

sd_event_exit(i->event, r);

}

static int raw_import_job_on_open_disk(ImportJob *j) {

RawImport *i;

int r;

assert(j);

assert(j->userdata);

i = j->userdata;

r = import_make_path(j->url, j->etag, i->image_root, ".raw-", ".raw", &i->final_path);

if (r < 0)

return log_oom();

r = tempfn_random(i->final_path, &i->temp_path);

if (r <0)

return log_oom();

mkdir_parents_label(i->temp_path, 0700);

j->disk_fd = open(i->temp_path, O_RDWR|O_CREAT|O_EXCL|O_NOCTTY|O_CLOEXEC, 0644);

if (j->disk_fd < 0)

return log_error_errno(errno, "Failed to create %s: %m", i->temp_path);

r = chattr_fd(j->disk_fd, true, FS_NOCOW_FL);

if (r < 0)

log_warning_errno(errno, "Failed to set file attributes on %s: %m", i->temp_path);

return 0;

}

int raw_import_pull(RawImport *i, const char *url, const char *local, bool force_local, ImportVerify verify) {

int r;

assert(i);

assert(verify < _IMPORT_VERIFY_MAX);

assert(verify >= 0);

if (i->raw_job)

return -EBUSY;

if (!http_url_is_valid(url))

return -EINVAL;

if (local && !machine_name_is_valid(local))

return -EINVAL;

r = free_and_strdup(&i->local, local);

if (r < 0)

return r;

i->force_local = force_local;

i->verify = verify;

/* Queue job for the image itself */

r = import_job_new(&i->raw_job, url, i->glue, i);

if (r < 0)

return r;

i->raw_job->on_finished = raw_import_job_on_finished;

i->raw_job->on_open_disk = raw_import_job_on_open_disk;

i->raw_job->calc_hash = true;

r = import_find_old_etags(url, i->image_root, DT_REG, ".raw-", ".raw", &i->raw_job->old_etags);

if (r < 0)

return r;

if (verify != IMPORT_VERIFY_NO) {

_cleanup_free_ char *sha256sums_url = NULL;

/* Queue job for the SHA256SUMS file for the image */

r = import_url_change_last_component(url, "SHA256SUMS", &sha256sums_url);

if (r < 0)

return r;

r = import_job_new(&i->sha256sums_job, sha256sums_url, i->glue, i);

if (r < 0)

return r;

i->sha256sums_job->on_finished = raw_import_job_on_finished;

i->sha256sums_job->uncompressed_max = i->sha256sums_job->compressed_max = 1ULL * 1024ULL * 1024ULL;

}

if (verify == IMPORT_VERIFY_SIGNATURE) {

_cleanup_free_ char *sha256sums_sig_url = NULL;

/* Queue job for the SHA256SUMS.gpg file for the image. */

r = import_url_change_last_component(url, "SHA256SUMS.gpg", &sha256sums_sig_url);

if (r < 0)

return r;

r = import_job_new(&i->signature_job, sha256sums_sig_url, i->glue, i);

if (r < 0)

return r;

i->signature_job->on_finished = raw_import_job_on_finished;

i->signature_job->uncompressed_max = i->signature_job->compressed_max = 1ULL * 1024ULL * 1024ULL;

}

r = import_job_begin(i->raw_job);

if (r < 0)

return r;

if (i->sha256sums_job) {

r = import_job_begin(i->sha256sums_job);

if (r < 0)

return r;

}

if (i->signature_job) {

r = import_job_begin(i->signature_job);

if (r < 0)

return r;

}

return 0;

}