import: make verification code generic, in preparation for using it pull-tar

src/import/import-job.c

@@ -38,22 +38,20 @@ ImportJob* import_job_unref(ImportJob *j) {
         else if (j->compressed == IMPORT_JOB_GZIP)
                 inflateEnd(&j->gzip);
 
-        if (j->hash_context)
-                gcry_md_close(j->hash_context);
+        if (j->checksum_context)
+                gcry_md_close(j->checksum_context);
 
         free(j->url);
         free(j->etag);
         strv_free(j->old_etags);
         free(j->payload);
-        free(j->sha256);
+        free(j->checksum);
 
         free(j);
 
         return NULL;
 }
 
-DEFINE_TRIVIAL_CLEANUP_FUNC(ImportJob*, import_job_unref);
-
 static void import_job_finish(ImportJob *j, int ret) {
         assert(j);
 
@@ -124,23 +122,23 @@ void import_job_curl_on_finished(CurlGlue *g, CURL *curl, CURLcode result) {
                 goto finish;
         }
 
-        if (j->hash_context) {
+        if (j->checksum_context) {
                 uint8_t *k;
 
-                k = gcry_md_read(j->hash_context, GCRY_MD_SHA256);
+                k = gcry_md_read(j->checksum_context, GCRY_MD_SHA256);
                 if (!k) {
                         log_error("Failed to get checksum.");
                         r = -EIO;
                         goto finish;
                 }
 
-                j->sha256 = hexmem(k, gcry_md_get_algo_dlen(GCRY_MD_SHA256));
-                if (!j->sha256) {
+                j->checksum = hexmem(k, gcry_md_get_algo_dlen(GCRY_MD_SHA256));
+                if (!j->checksum) {
                         r = log_oom();
                         goto finish;
                 }
 
-                log_debug("SHA256 of %s is %s.", j->url, j->sha256);
+                log_debug("SHA256 of %s is %s.", j->url, j->checksum);
         }
 
         if (j->disk_fd >= 0 && j->allow_sparse) {
@@ -243,8 +241,8 @@ static int import_job_write_compressed(ImportJob *j, void *p, size_t sz) {
                 return -EFBIG;
         }
 
-        if (j->hash_context)
-                gcry_md_write(j->hash_context, p, sz);
+        if (j->checksum_context)
+                gcry_md_write(j->checksum_context, p, sz);
 
         switch (j->compressed) {
 
@@ -335,8 +333,8 @@ static int import_job_open_disk(ImportJob *j) {
                 }
         }
 
-        if (j->calc_hash) {
-                if (gcry_md_open(&j->hash_context, GCRY_MD_SHA256, 0) != 0) {
+        if (j->calc_checksum) {
+                if (gcry_md_open(&j->checksum_context, GCRY_MD_SHA256, 0) != 0) {
                         log_error("Failed to initialize hash context.");
                         return -EIO;
                 }

src/import/import-job.h

@@ -96,10 +96,10 @@ struct ImportJob {
 
         bool allow_sparse;
 
-        bool calc_hash;
-        gcry_md_hd_t hash_context;
+        bool calc_checksum;
+        gcry_md_hd_t checksum_context;
 
-        char *sha256;
+        char *checksum;
 };
 
 int import_job_new(ImportJob **job, const char *url, CurlGlue *glue, void *userdata);
@@ -108,3 +108,5 @@ ImportJob* import_job_unref(ImportJob *job);
 int import_job_begin(ImportJob *j);
 
 void import_job_curl_on_finished(CurlGlue *g, CURL *curl, CURLcode result);
+
+DEFINE_TRIVIAL_CLEANUP_FUNC(ImportJob*, import_job_unref);

src/import/import-raw.c

@@ -21,9 +21,7 @@
 
 #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"
@@ -47,7 +45,7 @@ struct RawImport {
         char *image_root;
 
         ImportJob *raw_job;
-        ImportJob *sha256sums_job;
+        ImportJob *checksum_job;
         ImportJob *signature_job;
 
         RawImportFinished on_finished;
@@ -67,7 +65,7 @@ RawImport* raw_import_unref(RawImport *i) {
                 return NULL;
 
         import_job_unref(i->raw_job);
-        import_job_unref(i->sha256sums_job);
+        import_job_unref(i->checksum_job);
         import_job_unref(i->signature_job);
 
         curl_glue_unref(i->glue);
@@ -251,170 +249,6 @@ static int raw_import_make_local_copy(RawImport *i) {
         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
-                 * 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], 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;
@@ -424,7 +258,7 @@ static void raw_import_job_on_finished(ImportJob *j) {
 
         i = j->userdata;
         if (j->error != 0) {
-                if (j == i->sha256sums_job)
+                if (j == i->checksum_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?)");
@@ -442,17 +276,18 @@ static void raw_import_job_on_finished(ImportJob *j) {
          *
          * We only do something when we got all three files */
 
-        if (!IMPORT_JOB_STATE_IS_COMPLETE(i->raw_job))
+        if (i->raw_job->state != IMPORT_JOB_DONE)
                 return;
-        if (i->sha256sums_job && !IMPORT_JOB_STATE_IS_COMPLETE(i->sha256sums_job))
+        if (i->checksum_job && i->checksum_job->state != IMPORT_JOB_DONE)
                 return;
-        if (i->signature_job && !IMPORT_JOB_STATE_IS_COMPLETE(i->signature_job))
+        if (i->signature_job && i->signature_job->state != IMPORT_JOB_DONE)
                 return;
 
         if (!i->raw_job->etag_exists) {
+                /* This is a new download, verify it, and move it into place */
                 assert(i->raw_job->disk_fd >= 0);
 
-                r = raw_import_verify_sha256sum(i);
+                r = import_verify(i->raw_job, i->checksum_job, i->signature_job);
                 if (r < 0)
                         goto finish;
 
@@ -546,50 +381,22 @@ int raw_import_pull(RawImport *i, const char *url, const char *local, bool force
 
         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;
+        i->raw_job->calc_checksum = verify != IMPORT_VERIFY_NO;
 
         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_make_verification_jobs(&i->checksum_job, &i->signature_job, verify, url, i->glue, raw_import_job_on_finished, i);
+        if (r < 0)
+                return r;
 
         r = import_job_begin(i->raw_job);
         if (r < 0)
                 return r;
 
-        if (i->sha256sums_job) {
-                r = import_job_begin(i->sha256sums_job);
+        if (i->checksum_job) {
+                r = import_job_begin(i->checksum_job);
                 if (r < 0)
                         return r;
         }

src/import/import-util.c

@@ -19,10 +19,13 @@
   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 "/.#\"\'"
@@ -278,3 +281,234 @@ static const char* const import_verify_table[_IMPORT_VERIFY_MAX] = {
 };
 
 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;
+}

src/import/import-util.h

@@ -23,6 +23,8 @@
 
 #include <stdbool.h>
 
+#include "import-job.h"
+
 typedef enum ImportVerify {
         IMPORT_VERIFY_NO,
         IMPORT_VERIFY_SUM,
@@ -47,3 +49,6 @@ int import_url_change_last_component(const char *url, const char *suffix, char *
 
 const char* import_verify_to_string(ImportVerify v) _const_;
 ImportVerify import_verify_from_string(const char *s) _pure_;
+
+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);
+int import_verify(ImportJob *main_job, ImportJob *checksum_job, ImportJob *signature_job);