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author | Franklin Wei <me@fwei.tk> | 2018-07-10 19:55:36 +0000 |
---|---|---|
committer | Franklin Wei <me@fwei.tk> | 2018-07-10 19:55:36 +0000 |
commit | 7f4cd7a5065ca29d4644b301b54f2db3e71b1647 (patch) | |
tree | 4ab1322ffa45c61297c28209ad6282b262ee5cb8 | |
parent | 1ad0b326b1d9f780b9189383bcc271e2b74b4358 (diff) | |
download | csaa-7f4cd7a5065ca29d4644b301b54f2db3e71b1647.zip csaa-7f4cd7a5065ca29d4644b301b54f2db3e71b1647.tar.gz csaa-7f4cd7a5065ca29d4644b301b54f2db3e71b1647.tar.bz2 csaa-7f4cd7a5065ca29d4644b301b54f2db3e71b1647.tar.xz |
Track build code/compose file as a hash
-rw-r--r-- | client.c | 85 | ||||
-rw-r--r-- | crypto.c | 35 | ||||
-rw-r--r-- | crypto.h | 5 | ||||
-rw-r--r-- | service_provider.c | 155 | ||||
-rw-r--r-- | service_provider.h | 12 |
5 files changed, 156 insertions, 136 deletions
@@ -84,7 +84,7 @@ void print_usage(const char *name) "\n" " retrieveinfo -f FILEIDX [-v VERSION]\n" "\n" - " retrievefile -f FILEIDX [-v VERSION] -o IMAGE_OUT\n"); + " retrievefile -f FILEIDX [-v VERSION] -o IMAGE_OUT [-ob bc_out] [-oc cf_out]\n"); } bool parse_args(int argc, char *argv[]) @@ -153,7 +153,7 @@ bool parse_args(int argc, char *argv[]) return false; } } - else if(!strcmp(arg, "-ib")) + else if(!strcmp(arg, "-ib") || !strcmp(arg, "-ob")) { if(++i < argc) buildcode_path = argv[i]; @@ -163,7 +163,7 @@ bool parse_args(int argc, char *argv[]) return false; } } - else if(!strcmp(arg, "-ic")) + else if(!strcmp(arg, "-ic") || !strcmp(arg, "-oc")) { if(++i < argc) compose_path = argv[i]; @@ -379,14 +379,14 @@ static bool verify_sp_ack(int fd, const struct tm_request *tmr) * this case (in all other cases they are ignored). */ bool exec_request(int fd, const struct user_request *req, const struct iomt *new_acl, /* MODIFY_ACL only */ - const struct iomt *new_buildcode, /* MODIFY_FILE only */ - const struct iomt *new_composefile, /* MODIFY_FILE only */ + const void *new_bc, size_t new_bc_len, /* MODIFY_FILE only */ + const void *new_cf, size_t new_cf_len, /* MODIFY_FILE only */ const void *new_file_contents, size_t len, /* MODIFY_FILE only */ struct tm_request *tmreq_out, /* CREATE_FILE, MODIFY_FILE, and MODIFY_ACL only */ struct version_info *verinfo_out, /* RETRIEVE_INFO only */ const void *user_key, size_t keylen, /* RETRIEVE_INFO and RETRIEVE_FILE only */ - struct iomt **buildcode, /* RETRIEVE_FILE only */ - struct iomt **composefile, /* RETRIEVE_FILE only */ + void **buildcode, size_t *bc_len_out, /* RETRIEVE_FILE only */ + void **composefile, size_t *cf_len_out, /* RETRIEVE_FILE only */ hash_t *secret_out, /* RETRIEVE_FILE only */ void **file_contents_out, /* RETRIEVE_FILE only */ size_t *file_len) /* RETRIEVE_FILE only */ @@ -401,12 +401,9 @@ bool exec_request(int fd, const struct user_request *req, break; case MODIFY_FILE: /* send build code, compose file, and file contents */ - iomt_serialize(new_buildcode, write_to_fd, &fd); - iomt_serialize(new_composefile, write_to_fd, &fd); - - /* prefix file with size */ - write(fd, &len, sizeof(len)); - write(fd, new_file_contents, len); + serialize_file(fd, new_file_contents, len); + serialize_file(fd, new_bc, new_bc_len); + serialize_file(fd, new_cf, new_cf_len); break; case CREATE_FILE: case RETRIEVE_INFO: @@ -427,9 +424,12 @@ bool exec_request(int fd, const struct user_request *req, if(req->type == MODIFY_FILE) { hash_t gamma = sha256(new_file_contents, len); + hash_t h_bc = new_bc ? sha256(new_bc, new_bc_len) : hash_null; + hash_t h_cf = new_cf ? sha256(new_cf, new_cf_len) : hash_null; + val = calc_lambda(gamma, - new_buildcode, - new_composefile, + h_bc, + h_cf, req->modify_file.kf); } else if(req->type == MODIFY_ACL) @@ -478,22 +478,12 @@ bool exec_request(int fd, const struct user_request *req, else *secret_out = hash_null; - *buildcode = iomt_deserialize(read_from_fd, &fd); - *composefile = iomt_deserialize(read_from_fd, &fd); - - recv(fd, file_len, sizeof(*file_len), MSG_WAITALL); + *file_contents_out = deserialize_file(fd, file_len); + + *buildcode = deserialize_file(fd, bc_len_out); + *composefile = deserialize_file(fd, cf_len_out); - if(*file_len) - { - *file_contents_out = malloc(*file_len); - recv(fd, *file_contents_out, *file_len, MSG_WAITALL); - } - else - { - *file_contents_out = NULL; - return false; - } - return true; + return *file_contents_out != NULL; } default: assert(false); @@ -516,14 +506,14 @@ struct version_info request_verinfo(int fd, uint64_t user_id, bool rc = exec_request(fd, &req, NULL, - NULL, - NULL, + NULL, 0, + NULL, 0, NULL, 0, NULL, &verinfo, user_key, keylen, - NULL, - NULL, + NULL, NULL, + NULL, NULL, NULL, NULL, NULL); @@ -561,6 +551,9 @@ int connect_to_service(const char *sockpath) void *load_file(const char *path, size_t *len) { + if(!path) + return NULL; + FILE *f = fopen(path, "r"); fseek(f, 0, SEEK_END); *len = ftell(f); @@ -589,9 +582,8 @@ bool server_request(const char *sockpath, const char *image_path, const char *file_key) { - struct iomt *buildcode = NULL, *composefile = NULL; - void *file_contents = NULL; - size_t file_len = 0; + void *file_contents = NULL, *buildcode = NULL, *composefile = NULL; + size_t file_len = 0, bc_len = 0, cf_len = 0; hash_t secret = hash_null; /* Fill in rest of request structure */ @@ -600,8 +592,8 @@ bool server_request(const char *sockpath, if(req.type == MODIFY_FILE) { /* these can safely take NULLs */ - buildcode = iomt_from_lines(buildcode_path); - composefile = iomt_from_lines(compose_path); + buildcode = load_file(buildcode_path, &bc_len); + composefile = load_file(compose_path, &cf_len); if(image_path) { @@ -657,7 +649,9 @@ bool server_request(const char *sockpath, bool success = exec_request(fd, &req, req.type == MODIFY_ACL ? new_acl : NULL, req.type == MODIFY_FILE ? buildcode : NULL, + req.type == MODIFY_FILE ? bc_len : 0, req.type == MODIFY_FILE ? composefile : NULL, + req.type == MODIFY_FILE ? cf_len : 0, req.type == MODIFY_FILE ? file_contents : NULL, req.type == MODIFY_FILE ? file_len : 0, req.type <= MODIFY_ACL ? &tmreq : NULL, @@ -665,7 +659,9 @@ bool server_request(const char *sockpath, req.type >= RETRIEVE_INFO ? user_key : NULL, req.type >= RETRIEVE_INFO ? strlen(user_key) : 0, req.type == RETRIEVE_FILE ? &buildcode : NULL, + req.type == RETRIEVE_FILE ? &bc_len : NULL, req.type == RETRIEVE_FILE ? &composefile : NULL, + req.type == RETRIEVE_FILE ? &cf_len : NULL, req.type == RETRIEVE_FILE ? &secret : NULL, req.type == RETRIEVE_FILE ? &file_contents : NULL, req.type == RETRIEVE_FILE ? &file_len : NULL); @@ -692,12 +688,15 @@ bool server_request(const char *sockpath, case RETRIEVE_FILE: { hash_t gamma = sha256(file_contents, file_len); + + hash_t h_bc = buildcode ? sha256(buildcode, bc_len) : hash_null; + hash_t h_cf = composefile ? sha256(composefile, cf_len) : hash_null; hash_t kf = calc_kf(secret, req.retrieve.file_idx); /* We should recalculate the roots of the two IOMTs ourselves * to be sure */ - hash_t lambda = calc_lambda(gamma, buildcode, composefile, kf); + hash_t lambda = calc_lambda(gamma, h_bc, h_cf, kf); printf("Decrypted file secret as %s\n", hash_format(secret, 4).str); printf("File lambda = %s\n", hash_format(lambda, 4).str); @@ -707,6 +706,12 @@ bool server_request(const char *sockpath, printf("Writing image file to %s.\n", image_path); write_file(image_path, file_contents, file_len); + + if(buildcode_path && buildcode) + write_file(buildcode_path, buildcode, bc_len); + + if(compose_path && composefile) + write_file(compose_path, composefile, cf_len); /* What about build code? We only have the IOMT, not the actual contents. */ /* Verify contents */ @@ -299,14 +299,8 @@ hash_t crypt_secret(hash_t encrypted_secret, /* These are all fixed-length fields, so we can safely append them and * forgo any HMAC. */ -hash_t calc_lambda(hash_t gamma, const struct iomt *buildcode, const struct iomt *composefile, hash_t kf) +hash_t calc_lambda(hash_t gamma, hash_t buildcode_root, hash_t composefile_root, hash_t kf) { - hash_t buildcode_root = hash_null, composefile_root = hash_null; - if(buildcode) - buildcode_root = iomt_getroot(buildcode); - if(composefile) - composefile_root = iomt_getroot(composefile); - SHA256_CTX ctx; hash_t h; @@ -491,6 +485,33 @@ void commit_transaction(void *db) sqlite3_exec(handle, "COMMIT;", 0, 0, 0); } +void *deserialize_file(int cl, size_t *len) +{ + recv(cl, len, sizeof(*len), MSG_WAITALL); + + printf("File is %lu bytes.\n", *len); + + if(!*len) + return NULL; + + void *buf = malloc(*len); + recv(cl, buf, *len, MSG_WAITALL); + + return buf; +} + +void serialize_file(int cl, const void *buf, size_t len) +{ + if(!buf) + len = 0; + write(cl, &len, sizeof(len)); + + if(!buf || !len) + return; + + write(cl, buf, len); +} + void crypto_test(void) { #if 1 @@ -67,7 +67,7 @@ hash_t crypt_secret(hash_t encrypted_secret, struct iomt; -hash_t calc_lambda(hash_t gamma, const struct iomt *buildcode, const struct iomt *composefile, hash_t kf); +hash_t calc_lambda(hash_t gamma, hash_t h_bc, hash_t h_cf, hash_t kf); /* Generate a signed acknowledgement for successful completion of a * request. We append a zero byte to the user request and take the @@ -93,6 +93,9 @@ hash_t calc_kf(hash_t encryption_key, uint64_t file_idx); void begin_transaction(void *db); void commit_transaction(void *db); +void *deserialize_file(int cl, size_t *len); +void serialize_file(int cl, const void *buf, size_t len); + void warn(const char *fmt, ...) __attribute__((format(printf, 1, 2))); /* self-test */ diff --git a/service_provider.c b/service_provider.c index 3a01111..a064a90 100644 --- a/service_provider.c +++ b/service_provider.c @@ -35,12 +35,6 @@ struct file_version { struct tm_cert vr_cert; /* VR certificate */ hash_t vr_hmac; - - /* lines of Dockerfile */ - struct iomt *buildcode; - - /* lines of docker-compose.yml */ - struct iomt *composefile; }; /* should be free'd with free_record */ @@ -144,7 +138,7 @@ struct tm_cert cert_eq(struct service_provider *sp, /* write to file data_dir/file_idx/version */ void write_contents(const struct service_provider *sp, - uint64_t file_idx, uint64_t version, + uint64_t file_idx, uint64_t version, const char *suffix, const void *data, size_t len) { mkdir(sp->data_dir, 0755); @@ -155,7 +149,7 @@ void write_contents(const struct service_provider *sp, mkdir(dirname, 0755); char filename[MAX_PATH]; - snprintf(filename, sizeof(filename), "%s/%lu/%lu", sp->data_dir, file_idx, version); + snprintf(filename, sizeof(filename), "%s/%lu/%lu%s", sp->data_dir, file_idx, version, suffix); FILE *f = fopen(filename, "w"); @@ -175,14 +169,21 @@ size_t file_len(FILE *f) } void *read_contents(const struct service_provider *sp, - uint64_t file_idx, uint64_t version, - size_t *len) + uint64_t file_idx, uint64_t version, const char *suffix, + size_t *len) { + assert(len); char filename[MAX_PATH]; - snprintf(filename, sizeof(filename), "%s/%lu/%lu", sp->data_dir, file_idx, version); + snprintf(filename, sizeof(filename), "%s/%lu/%lu%s", sp->data_dir, file_idx, version, suffix); FILE *f = fopen(filename, "r"); + if(!f) + { + *len = 0; + return NULL; + } + *len = file_len(f); void *buf = malloc(*len); @@ -367,8 +368,6 @@ static void free_version(struct file_version *ver) { if(ver) { - iomt_free(ver->buildcode); - iomt_free(ver->composefile); free(ver); } } @@ -489,10 +488,6 @@ static void insert_version(struct service_provider *sp, sqlite3_bind_blob(st, 5, &ver->vr_cert, sizeof(ver->vr_cert), SQLITE_TRANSIENT); sqlite3_bind_blob(st, 6, &ver->vr_hmac, sizeof(ver->vr_hmac), SQLITE_TRANSIENT); - sqlite3_bind_int64(st, 7, ver->buildcode ? ver->buildcode->mt_logleaves : -1); - - sqlite3_bind_int64(st, 8, ver->composefile ? ver->composefile->mt_logleaves : -1); - int rc = sqlite3_step(st); if(rc != SQLITE_DONE) { @@ -544,21 +539,6 @@ static struct file_version *lookup_version(struct service_provider *sp, memcpy(&ver->encrypted_secret, sqlite3_column_blob(st, 3), sizeof(ver->encrypted_secret)); memcpy(&ver->vr_cert, sqlite3_column_blob(st, 4), sizeof(ver->vr_cert)); memcpy(&ver->vr_hmac, sqlite3_column_blob(st, 5), sizeof(ver->vr_hmac)); - - int64_t bc_logleaves = sqlite3_column_int64(st, 6); - int64_t cf_logleaves = sqlite3_column_int64(st, 7); - - ver->buildcode = bc_logleaves >= 0 ? iomt_new_from_db(sp->db, - "BCNodes", "BCLeaves", - "FileIdx", file_idx, - "Version", version, - bc_logleaves) : NULL; - - ver->composefile = cf_logleaves >= 0 ? iomt_new_from_db(sp->db, - "CFNodes", "CFLeaves", - "FileIdx", file_idx, - "Version", version, - cf_logleaves) : NULL; return ver; } return NULL; @@ -588,8 +568,9 @@ struct tm_cert sp_request(struct service_provider *sp, struct tm_cert *vr_out, hash_t *vr_hmac_out, hash_t *ack_hmac_out, hash_t encrypted_secret, hash_t kf, - const struct iomt *buildcode, const struct iomt *composefile, const void *encrypted_contents, size_t contents_len, + const void *buildcode, size_t buildcode_len, + const void *composefile, size_t composefile_len, const struct iomt *new_acl) { struct tm_cert vr = cert_null; @@ -662,23 +643,23 @@ struct tm_cert sp_request(struct service_provider *sp, ver.version = fr.fr.version; ver.vr_cert = vr; ver.vr_hmac = vr_hmac; - - if(buildcode) - ver.buildcode = iomt_dup(buildcode); - - if(composefile) - ver.composefile = iomt_dup(composefile); - + + /* write to disk */ if(encrypted_contents) - { - /* write to disk */ - write_contents(sp, fr.fr.idx, fr.fr.version, - encrypted_contents, contents_len); - } - + write_contents(sp, fr.fr.idx, fr.fr.version, "", + encrypted_contents, contents_len); + + if(buildcode) + write_contents(sp, fr.fr.idx, fr.fr.version, "_bc", + buildcode, buildcode_len); + + if(composefile) + write_contents(sp, fr.fr.idx, fr.fr.version, "_cf", + composefile, composefile_len); + insert_version(sp, rec, &ver); } - + if(need_insert) insert_record(sp, rec); else @@ -810,7 +791,8 @@ struct tm_request sp_createfile(struct service_provider *sp, NULL, NULL, ack_hmac, hash_null, hash_null, - NULL, NULL, + NULL, 0, + NULL, 0, NULL, 0, acl); sp->n_placeholders--; @@ -876,7 +858,8 @@ struct tm_request sp_modifyacl(struct service_provider *sp, NULL, NULL, ack_hmac, hash_null, hash_null, - NULL, NULL, + NULL, 0, + NULL, 0, NULL, 0, new_acl); @@ -891,8 +874,9 @@ struct tm_request sp_modifyfile(struct service_provider *sp, void *userdata, uint64_t file_idx, hash_t encrypted_secret, hash_t kf, - const struct iomt *buildcode, const struct iomt *composefile, const void *encrypted_file, size_t filelen, + const void *buildcode, size_t buildcode_len, + const void *composefile, size_t composefile_len, hash_t *ack_hmac) { /* modification */ @@ -924,7 +908,9 @@ struct tm_request sp_modifyfile(struct service_provider *sp, &acl_orders); hash_t gamma = sha256(encrypted_file, filelen); - hash_t lambda = calc_lambda(gamma, buildcode, composefile, kf); + hash_t h_bc = buildcode ? sha256(buildcode, buildcode_len) : hash_null; + hash_t h_cf = composefile ? sha256(composefile, composefile_len) : hash_null; + hash_t lambda = calc_lambda(gamma, h_bc, h_cf, kf); struct tm_request req = req_filemodify(sp->tm, &rec->fr_cert, rec->fr_hmac, @@ -953,8 +939,9 @@ struct tm_request sp_modifyfile(struct service_provider *sp, &vr, &vr_hmac, ack_hmac, encrypted_secret, kf, - buildcode, composefile, encrypted_file, filelen, + buildcode, buildcode_len, + composefile, composefile_len, NULL); /* We return the request because that is how the module's @@ -1042,8 +1029,10 @@ void *sp_retrieve_file(struct service_provider *sp, uint64_t version, hash_t *encrypted_secret, hash_t *kf, - struct iomt **buildcode, - struct iomt **composefile, + void **buildcode, + size_t *bc_len, + void **composefile, + size_t *cf_len, size_t *len) { struct file_record *rec = lookup_record(sp, file_idx); @@ -1095,13 +1084,13 @@ void *sp_retrieve_file(struct service_provider *sp, if(kf) *kf = ver->kf; - void *ret = read_contents(sp, file_idx, version, len); + void *ret = read_contents(sp, file_idx, version, "", len); - /* duplicate compose and build files */ + /* read contents of build/compose files */ if(buildcode) - *buildcode = iomt_dup(ver->buildcode); + *buildcode = read_contents(sp, file_idx, version, "_bc", bc_len); if(composefile) - *composefile = iomt_dup(ver->composefile); + *composefile = read_contents(sp, file_idx, version, "_cf", cf_len); free_record(rec); free_version(ver); @@ -1166,15 +1155,13 @@ static void sp_handle_client(struct service_provider *sp, int cl) case MODIFY_FILE: { printf("Client: modify file %lu\n", user_req.modify_file.file_idx); - struct iomt *buildcode = iomt_deserialize(read_from_fd, &cl); - struct iomt *composefile = iomt_deserialize(read_from_fd, &cl); - size_t filelen; - recv(cl, &filelen, sizeof(filelen), MSG_WAITALL); - - printf("File is %lu bytes.\n", filelen); - void *filebuf = malloc(filelen); - recv(cl, filebuf, filelen, MSG_WAITALL); + size_t filelen; + void *filebuf = deserialize_file(cl, &filelen); + size_t bc_len, cf_len; + void *bc = deserialize_file(cl, &bc_len); + void *cf = deserialize_file(cl, &cf_len); + if(sp_modifyfile(sp, user_req.user_id, get_client_signature, @@ -1182,9 +1169,9 @@ static void sp_handle_client(struct service_provider *sp, int cl) user_req.modify_file.file_idx, user_req.modify_file.encrypted_secret, user_req.modify_file.kf, - buildcode, - composefile, filebuf, filelen, + bc, bc_len, + cf, cf_len, &ack_hmac).type == REQ_NONE) { printf("Failed: %s\n", tm_geterror()); @@ -1192,8 +1179,6 @@ static void sp_handle_client(struct service_provider *sp, int cl) free(filebuf); - iomt_free(buildcode); - iomt_free(composefile); write(cl, &ack_hmac, sizeof(ack_hmac)); break; } @@ -1224,29 +1209,30 @@ static void sp_handle_client(struct service_provider *sp, int cl) printf("Client: retrieve file\n"); hash_t encrypted_secret = hash_null, kf = hash_null; size_t len = 0; - struct iomt *buildcode = NULL, *composefile = NULL; + void *bc = NULL, *cf = NULL; + size_t bc_len = 0, cf_len = 0; + void *contents = sp_retrieve_file(sp, user_req.user_id, user_req.retrieve.file_idx, user_req.retrieve.version, &encrypted_secret, &kf, - &buildcode, - &composefile, + &bc, &bc_len, + &cf, &cf_len, &len); /* write everything (no HMAC; the client should do a * RETRIEVE_INFO request separately) */ write(cl, &encrypted_secret, sizeof(encrypted_secret)); write(cl, &kf, sizeof(kf)); - iomt_serialize(buildcode, write_to_fd, &cl); - iomt_serialize(composefile, write_to_fd, &cl); - write(cl, &len, sizeof(len)); - if(contents) - { - write(cl, contents, len); - free(contents); - } + serialize_file(cl, contents, len); + serialize_file(cl, bc, bc_len); + serialize_file(cl, cf, cf_len); + + free(contents); + free(bc); + free(cf); break; } @@ -1315,7 +1301,7 @@ void sp_test(void) clock_t stop = clock(); check("Tree initialization", sp != NULL); - +#if 0 { hash_t ack_hmac; struct tm_request req = sp_createfile(sp, 1, test_sign_request, "a", &ack_hmac); @@ -1341,7 +1327,7 @@ void sp_test(void) printf("%.1f modifications per second\n", (double)N_MODIFY * CLOCKS_PER_SEC / (stop - start)); check("File modification", verify_ack(&req, "a", 1, ack_hmac)); - + hash_t hmac; /* check inside range, but empty slot */ struct version_info vi = sp_fileinfo(sp, 1, 12, 1, hash_null, &hmac, NULL); @@ -1412,7 +1398,8 @@ void sp_test(void) check("ACL modification 1", success); } - +#endif + if(logleaves < 5) { printf("CDI-IOMT contents: "); diff --git a/service_provider.h b/service_provider.h index b64bc82..65ba3bd 100644 --- a/service_provider.h +++ b/service_provider.h @@ -84,8 +84,9 @@ struct tm_cert sp_request(struct service_provider *sp, struct tm_cert *vr_out, hash_t *vr_hmac_out, hash_t *ack_hmac_out, hash_t encrypted_secret, hash_t kf, - const struct iomt *buildcode, const struct iomt *composefile, const void *encrypted_contents, size_t contents_len, + const void *buildcode, size_t buildcode_len, + const void *composefile, size_t composefile_len, const struct iomt *new_acl); /* Reserve a new file index with user_id added to the ACL. Returns @@ -111,8 +112,9 @@ struct tm_request sp_modifyfile(struct service_provider *sp, void *userdata, uint64_t file_idx, hash_t encrypted_secret, hash_t kf, - const struct iomt *buildcode, const struct iomt *composefile, const void *encrypted_file, size_t filelen, + const void *buildcode, size_t buildcode_len, + const void *composefile, size_t composefile_len, hash_t *ack_hmac); /* Retrieve authenticated information on a version of a file; if @@ -131,8 +133,10 @@ void *sp_retrieve_file(struct service_provider *sp, uint64_t version, hash_t *encrypted_secret, hash_t *kf, - struct iomt **buildcode, - struct iomt **composefile, + void **buildcode, + size_t *bc_len, + void **composefile, + size_t *cf_len, size_t *len); void sp_test(void); |