From c03febfbf8deb75e7126ba42e800318f73423f3a Mon Sep 17 00:00:00 2001 From: Daniel Golle Date: Wed, 6 Jun 2018 22:21:23 +0200 Subject: [PATCH] implement cert issue Signed-off-by: Daniel Golle This work was sponsored by WIO (wiowireless.com) --- ucert.c | 139 ++++++++++++++++++++++++++++++++++++++++++++++---------- 1 file changed, 116 insertions(+), 23 deletions(-) diff --git a/ucert.c b/ucert.c index 06b46bb..b932b09 100644 --- a/ucert.c +++ b/ucert.c @@ -76,40 +76,45 @@ enum certtype_id { }; static const struct blobmsg_policy cert_payload_policy[CERT_PL_ATTR_MAX] = { - [CERT_PL_ATTR_CERTTYPE] = { .type = BLOBMSG_TYPE_INT8 }, - [CERT_PL_ATTR_CERTID] = { .type = BLOBMSG_TYPE_INT64 }, - [CERT_PL_ATTR_VALIDFROMTIME] = { .type = BLOBMSG_TYPE_INT64 }, - [CERT_PL_ATTR_EXPIRETIME] = { .type = BLOBMSG_TYPE_INT64 }, - [CERT_PL_ATTR_PUBKEY] = { .type = BLOBMSG_TYPE_STRING }, - [CERT_PL_ATTR_KEY_FINGERPRINT] = { .type = BLOBMSG_TYPE_STRING }, + [CERT_PL_ATTR_CERTTYPE] = { .name = "certtype", .type = BLOBMSG_TYPE_INT8 }, + [CERT_PL_ATTR_CERTID] = { .name = "certid", .type = BLOBMSG_TYPE_INT64 }, + [CERT_PL_ATTR_VALIDFROMTIME] = { .name = "validfrom", .type = BLOBMSG_TYPE_INT64 }, + [CERT_PL_ATTR_EXPIRETIME] = { .name = "expiresat", .type = BLOBMSG_TYPE_INT64 }, + [CERT_PL_ATTR_PUBKEY] = { .name = "pubkey", .type = BLOBMSG_TYPE_STRING }, + [CERT_PL_ATTR_KEY_FINGERPRINT] = { .name = "fingerprint", .type = BLOBMSG_TYPE_STRING }, }; +static int write_file(const char *filename, void *buf, size_t len, bool append) { + FILE *f; + size_t outlen; + + f = fopen(filename, append?"a":"w"); + if (!f) + return 1; + + outlen = fwrite(buf, 1, len, f); + fclose(f); + return (outlen == len); +} static int cert_load(const char *certfile, struct blob_attr *certtb[]) { FILE *f; - struct blob_buf certbuf; int ret = 0; char filebuf[CERT_BUF_LEN]; int len; - blob_buf_init(&certbuf, 0); - f = fopen(certfile, "r"); if (!f) return 1; - do { - len = fread(&filebuf, 1, CERT_BUF_LEN - 1, f); - blob_put_raw(&certbuf, filebuf, len); - } while(!feof(f) && !ferror(f)); - - ret = ferror(f); + len = fread(&filebuf, 1, CERT_BUF_LEN - 1, f); + ret = ferror(f) || !feof(f); fclose(f); - if (ret) return 1; - - return (blob_parse(certbuf.head, certtb, cert_policy, CERT_ATTR_MAX) != 0); + ret = blob_parse(filebuf, certtb, cert_policy, CERT_ATTR_MAX); + fprintf(stderr, "blob_parse return %d\n", ret); + return (ret != 0); } static int cert_append(const char *certfile, const char *pubkeyfile, const char *sigfile) { @@ -119,26 +124,114 @@ static int cert_append(const char *certfile, const char *pubkeyfile, const char static int cert_dump(const char *certfile) { struct blob_attr *certtb[CERT_ATTR_MAX]; + int i; if (cert_load(certfile, certtb)) { fprintf(stderr, "cannot parse cert\n"); return 1; } + for (i = 0; i < CERT_ATTR_MAX; i++) { + struct blob_attr *v = certtb[i]; + + if (!v) + continue; + + switch(cert_policy[i].type) { + case BLOB_ATTR_BINARY: + fprintf(stdout, "signature: %s\n", blob_data(v)); + break; + case BLOB_ATTR_NESTED: + fprintf(stdout, "payload:\n%s\n", blobmsg_format_json(blob_data(v), true)); + break; + } + } return 0; } static int cert_issue(const char *certfile, const char *pubkeyfile, const char *seckeyfile) { struct blob_buf certbuf; struct blob_buf payloadbuf; + struct timeval tv; + struct stat st; + int pklen, siglen; + int revoker = 1; + + FILE *pkf, *sigf; + char pkb[512]; + char sigb[512]; + char fname[256], sfname[256]; + char pkfp[17]; + char tmpdir[] = "/tmp/ucert-XXXXXX"; + + if (stat(certfile, &st) == 0) { + fprintf(stderr, "certfile %s exists, won't overwrite.\n", certfile); + return -1; + } - blob_buf_init(&payloadbuf, 0); -/* usign_s() */ + pkf = fopen(pubkeyfile, "r"); + if (!pkf) + return -1; - blob_buf_init(&certbuf, 0); + pklen = fread(pkb, 1, 512, pkf); + pkb[pklen - 1] = '\0'; - fprintf(stderr, "not implemented\n"); - return 1; + if (pklen < 32) + return -1; + + fclose(pkf); + + if (usign_f_pubkey(pkfp, pubkeyfile)) + return -1; + + gettimeofday(&tv, NULL); + + if (mkdtemp(tmpdir) == NULL) + return errno; + + while (revoker >= 0) { + blob_buf_init(&payloadbuf, 0); + blobmsg_add_u8(&payloadbuf, "certtype", revoker?CERTTYPE_REVOKE:CERTTYPE_AUTH); + blobmsg_add_u64(&payloadbuf, "validfrom", tv.tv_sec); + if (!revoker) { + blobmsg_add_u64(&payloadbuf, "expiresat", tv.tv_sec + 60 * 60 * 24 * 365); + blobmsg_add_string(&payloadbuf, "pubkey", pkb); + } else { + blobmsg_add_string(&payloadbuf, "fingerprint", pkfp); + } + + snprintf(fname, sizeof(fname) - 1, "%s/%s", tmpdir, revoker?"revoker":"payload"); + write_file(fname, blob_data(payloadbuf.head), blob_len(payloadbuf.head), false); + + snprintf(sfname, sizeof(sfname) - 1, "%s/%s", tmpdir, revoker?"revoker.sig":"payload.sig"); + if (usign_s(fname, seckeyfile, sfname, quiet)) + return 1; + + sigf = fopen(sfname, "r"); + if (!sigf) + return 1; + + siglen = fread(sigb, 1, 1024, sigf); + if (siglen < 1) + return 1; + + sigb[siglen-1] = '\0'; + fclose(sigf); + + unlink(fname); + unlink(sfname); + + blob_buf_init(&certbuf, 0); + blob_put(&certbuf, CERT_ATTR_SIGNATURE, sigb, siglen); + blob_put(&certbuf, CERT_ATTR_PAYLOAD, blob_data(payloadbuf.head), blob_len(payloadbuf.head)); + snprintf(fname, sizeof(fname) - 1, "%s%s", certfile, revoker?".revoke":""); + write_file(fname, blob_data(certbuf.head), blob_len(certbuf.head), false); + revoker--; + } + + rmdir(tmpdir); + + return 0; } static int cert_process_revoker(const char *certfile) { -- 2.30.2