along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/
+#include <sys/prctl.h>
+
#include "util.h"
#include "strv.h"
#include "copy.h"
#include "btrfs-util.h"
+#include "import-job.h"
#include "import-util.h"
#define FILENAME_ESCAPE "/.#\"\'"
*ret = path;
return 0;
}
+
+int import_url_last_component(const char *url, char **ret) {
+ const char *e, *p;
+ char *s;
+
+ e = strchrnul(url, '?');
+
+ while (e > url && e[-1] == '/')
+ e--;
+
+ p = e;
+ while (p > url && p[-1] != '/')
+ p--;
+
+ if (e <= p)
+ return -EINVAL;
+
+ s = strndup(p, e - p);
+ if (!s)
+ return -ENOMEM;
+
+ *ret = s;
+ return 0;
+}
+
+
+int import_url_change_last_component(const char *url, const char *suffix, char **ret) {
+ const char *e;
+ char *s;
+
+ assert(url);
+ assert(ret);
+
+ e = strchrnul(url, '?');
+
+ while (e > url && e[-1] == '/')
+ e--;
+
+ while (e > url && e[-1] != '/')
+ e--;
+
+ if (e <= url)
+ return -EINVAL;
+
+ s = new(char, (e - url) + strlen(suffix) + 1);
+ if (!s)
+ return -ENOMEM;
+
+ strcpy(mempcpy(s, url, e - url), suffix);
+ *ret = s;
+ return 0;
+}
+
+static const char* const import_verify_table[_IMPORT_VERIFY_MAX] = {
+ [IMPORT_VERIFY_NO] = "no",
+ [IMPORT_VERIFY_SUM] = "sum",
+ [IMPORT_VERIFY_SIGNATURE] = "signature",
+};
+
+DEFINE_STRING_TABLE_LOOKUP(import_verify, ImportVerify);
+
+int import_make_verification_jobs(
+ ImportJob **ret_checksum_job,
+ ImportJob **ret_signature_job,
+ ImportVerify verify,
+ const char *url,
+ CurlGlue *glue,
+ ImportJobFinished on_finished,
+ void *userdata) {
+
+ _cleanup_(import_job_unrefp) ImportJob *checksum_job = NULL, *signature_job = NULL;
+ int r;
+
+ assert(ret_checksum_job);
+ assert(ret_signature_job);
+ assert(verify >= 0);
+ assert(verify < _IMPORT_VERIFY_MAX);
+ assert(url);
+ assert(glue);
+
+ if (verify != IMPORT_VERIFY_NO) {
+ _cleanup_free_ char *checksum_url = NULL;
+
+ /* Queue job for the SHA256SUMS file for the image */
+ r = import_url_change_last_component(url, "SHA256SUMS", &checksum_url);
+ if (r < 0)
+ return r;
+
+ r = import_job_new(&checksum_job, checksum_url, glue, userdata);
+ if (r < 0)
+ return r;
+
+ checksum_job->on_finished = on_finished;
+ checksum_job->uncompressed_max = checksum_job->compressed_max = 1ULL * 1024ULL * 1024ULL;
+ }
+
+ if (verify == IMPORT_VERIFY_SIGNATURE) {
+ _cleanup_free_ char *signature_url = NULL;
+
+ /* Queue job for the SHA256SUMS.gpg file for the image. */
+ r = import_url_change_last_component(url, "SHA256SUMS.gpg", &signature_url);
+ if (r < 0)
+ return r;
+
+ r = import_job_new(&signature_job, signature_url, glue, userdata);
+ if (r < 0)
+ return r;
+
+ signature_job->on_finished = on_finished;
+ signature_job->uncompressed_max = signature_job->compressed_max = 1ULL * 1024ULL * 1024ULL;
+ }
+
+ *ret_checksum_job = checksum_job;
+ *ret_signature_job = signature_job;
+
+ checksum_job = signature_job = NULL;
+
+ return 0;
+}
+
+int import_verify(
+ ImportJob *main_job,
+ ImportJob *checksum_job,
+ ImportJob *signature_job) {
+
+ _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(main_job);
+ assert(main_job->state == IMPORT_JOB_DONE);
+
+ if (!checksum_job)
+ return 0;
+
+ assert(main_job->calc_checksum);
+ assert(main_job->checksum);
+ assert(checksum_job->state == IMPORT_JOB_DONE);
+
+ if (!checksum_job->payload || checksum_job->payload_size <= 0) {
+ log_error("Checksum is empty, cannot verify.");
+ return -EBADMSG;
+ }
+
+ r = import_url_last_component(main_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(main_job->checksum, " *", fn, "\n");
+
+ p = memmem(checksum_job->payload,
+ checksum_job->payload_size,
+ line,
+ strlen(line));
+
+ if (!p || (p != (char*) checksum_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.", main_job->url);
+
+ if (!signature_job)
+ return 0;
+
+ assert(signature_job->state == IMPORT_JOB_DONE);
+
+ if (!signature_job->payload || signature_job->payload_size <= 0) {
+ log_error("Signature is empty, cannot verify.");
+ return -EBADMSG;
+ }
+
+ 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, signature_job->payload, 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
+ * arguments, if it's around since gpg fails
+ * otherwise. */
+ 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], checksum_job->payload, checksum_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;
+}
~ianmdlvl / elogind.git / blobdiff