/* * px5g - Embedded x509 key and certificate generator based on PolarSSL * * Copyright (C) 2009 Steven Barth * Copyright (C) 2014 Felix Fietkau * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License, version 2.1 as published by the Free Software Foundation. * * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, * MA 02110-1301 USA */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #define PX5G_VERSION "0.2" #define PX5G_COPY "Copyright (c) 2009 Steven Barth " #define PX5G_LICENSE "Licensed under the GNU Lesser General Public License v2.1" static int urandom_fd; static char buf[16384]; static int _urandom(void *ctx, unsigned char *out, size_t len) { read(urandom_fd, out, len); return 0; } static void write_file(const char *path, int len, bool pem) { FILE *f = stdout; const char *buf_start = buf; if (!pem) buf_start += sizeof(buf) - len; if (!len) { fprintf(stderr, "No data to write\n"); exit(1); } if (!f) { fprintf(stderr, "error: I/O error\n"); exit(1); } if (path) f = fopen(path, "w"); fwrite(buf_start, 1, len, f); fclose(f); } static mbedtls_ecp_group_id ecp_curve(const char *name) { const mbedtls_ecp_curve_info *curve_info; if (!strcmp(name, "P-256")) return MBEDTLS_ECP_DP_SECP256R1; else if (!strcmp(name, "P-384")) return MBEDTLS_ECP_DP_SECP384R1; else if (!strcmp(name, "P-521")) return MBEDTLS_ECP_DP_SECP521R1; curve_info = mbedtls_ecp_curve_info_from_name(name); if (curve_info == NULL) return MBEDTLS_ECP_DP_NONE; else return curve_info->grp_id; } static void write_key(mbedtls_pk_context *key, const char *path, bool pem) { int len = 0; if (pem) { if (mbedtls_pk_write_key_pem(key, (void *) buf, sizeof(buf)) == 0) len = strlen(buf); } else { len = mbedtls_pk_write_key_der(key, (void *) buf, sizeof(buf)); if (len < 0) len = 0; } write_file(path, len, pem); } static void gen_key(mbedtls_pk_context *key, bool rsa, int ksize, int exp, mbedtls_ecp_group_id curve, bool pem) { mbedtls_pk_init(key); if (rsa) { fprintf(stderr, "Generating RSA private key, %i bit long modulus\n", ksize); mbedtls_pk_setup(key, mbedtls_pk_info_from_type(MBEDTLS_PK_RSA)); if (!mbedtls_rsa_gen_key(mbedtls_pk_rsa(*key), _urandom, NULL, ksize, exp)) return; } else { fprintf(stderr, "Generating EC private key\n"); mbedtls_pk_setup(key, mbedtls_pk_info_from_type(MBEDTLS_PK_ECKEY)); if (!mbedtls_ecp_gen_key(curve, mbedtls_pk_ec(*key), _urandom, NULL)) return; } fprintf(stderr, "error: key generation failed\n"); exit(1); } int dokey(bool rsa, char **arg) { mbedtls_pk_context key; unsigned int ksize = 512; int exp = 65537; char *path = NULL; bool pem = true; mbedtls_ecp_group_id curve = MBEDTLS_ECP_DP_SECP256R1; while (*arg && **arg == '-') { if (!strcmp(*arg, "-out") && arg[1]) { path = arg[1]; arg++; } else if (!strcmp(*arg, "-3")) { exp = 3; } else if (!strcmp(*arg, "-der")) { pem = false; } arg++; } if (*arg && rsa) { ksize = (unsigned int)atoi(*arg); } else if (*arg) { curve = ecp_curve((const char *)*arg); if (curve == MBEDTLS_ECP_DP_NONE) { fprintf(stderr, "error: invalid curve name: %s\n", *arg); return 1; } } gen_key(&key, rsa, ksize, exp, curve, pem); write_key(&key, path, pem); mbedtls_pk_free(&key); return 0; } int selfsigned(char **arg) { mbedtls_pk_context key; mbedtls_x509write_cert cert; mbedtls_mpi serial; char *subject = ""; unsigned int ksize = 512; int exp = 65537; unsigned int days = 30; char *keypath = NULL, *certpath = NULL; bool pem = true; time_t from = time(NULL), to; char fstr[20], tstr[20], sstr[17]; int len; bool rsa = true; mbedtls_ecp_group_id curve = MBEDTLS_ECP_DP_SECP256R1; while (*arg && **arg == '-') { if (!strcmp(*arg, "-der")) { pem = false; } else if (!strcmp(*arg, "-newkey") && arg[1]) { if (!strncmp(arg[1], "rsa:", 4)) { rsa = true; ksize = (unsigned int)atoi(arg[1] + 4); } else if (!strcmp(arg[1], "ec")) { rsa = false; } else { fprintf(stderr, "error: invalid algorithm\n"); return 1; } arg++; } else if (!strcmp(*arg, "-days") && arg[1]) { days = (unsigned int)atoi(arg[1]); arg++; } else if (!strcmp(*arg, "-pkeyopt") && arg[1]) { if (strncmp(arg[1], "ec_paramgen_curve:", 18)) { fprintf(stderr, "error: invalid pkey option: %s\n", arg[1]); return 1; } curve = ecp_curve((const char *)(arg[1] + 18)); if (curve == MBEDTLS_ECP_DP_NONE) { fprintf(stderr, "error: invalid curve name: %s\n", arg[1] + 18); return 1; } arg++; } else if (!strcmp(*arg, "-keyout") && arg[1]) { keypath = arg[1]; arg++; } else if (!strcmp(*arg, "-out") && arg[1]) { certpath = arg[1]; arg++; } else if (!strcmp(*arg, "-subj") && arg[1]) { if (arg[1][0] != '/' || strchr(arg[1], ';')) { fprintf(stderr, "error: invalid subject"); return 1; } subject = calloc(strlen(arg[1]) + 1, 1); char *oldc = arg[1] + 1, *newc = subject, *delim; do { delim = strchr(oldc, '='); if (!delim) { fprintf(stderr, "error: invalid subject"); return 1; } memcpy(newc, oldc, delim - oldc + 1); newc += delim - oldc + 1; oldc = delim + 1; delim = strchr(oldc, '/'); if (!delim) { delim = arg[1] + strlen(arg[1]); } memcpy(newc, oldc, delim - oldc); newc += delim - oldc; *newc++ = ','; oldc = delim + 1; } while(*delim); arg++; } arg++; } gen_key(&key, rsa, ksize, exp, curve, pem); if (keypath) write_key(&key, keypath, pem); from = (from < 1000000000) ? 1000000000 : from; strftime(fstr, sizeof(fstr), "%Y%m%d%H%M%S", gmtime(&from)); to = from + 60 * 60 * 24 * days; if (to < from) to = INT_MAX; strftime(tstr, sizeof(tstr), "%Y%m%d%H%M%S", gmtime(&to)); fprintf(stderr, "Generating selfsigned certificate with subject '%s'" " and validity %s-%s\n", subject, fstr, tstr); mbedtls_x509write_crt_init(&cert); mbedtls_x509write_crt_set_md_alg(&cert, MBEDTLS_MD_SHA256); mbedtls_x509write_crt_set_issuer_key(&cert, &key); mbedtls_x509write_crt_set_subject_key(&cert, &key); mbedtls_x509write_crt_set_subject_name(&cert, subject); mbedtls_x509write_crt_set_issuer_name(&cert, subject); mbedtls_x509write_crt_set_validity(&cert, fstr, tstr); mbedtls_x509write_crt_set_basic_constraints(&cert, 0, -1); mbedtls_x509write_crt_set_subject_key_identifier(&cert); mbedtls_x509write_crt_set_authority_key_identifier(&cert); _urandom(NULL, (void *) buf, 8); for (len = 0; len < 8; len++) sprintf(sstr + len*2, "%02x", (unsigned char) buf[len]); mbedtls_mpi_init(&serial); mbedtls_mpi_read_string(&serial, 16, sstr); mbedtls_x509write_crt_set_serial(&cert, &serial); if (pem) { if (mbedtls_x509write_crt_pem(&cert, (void *) buf, sizeof(buf), _urandom, NULL) < 0) { fprintf(stderr, "Failed to generate certificate\n"); return 1; } len = strlen(buf); } else { len = mbedtls_x509write_crt_der(&cert, (void *) buf, sizeof(buf), _urandom, NULL); if (len < 0) { fprintf(stderr, "Failed to generate certificate: %d\n", len); return 1; } } write_file(certpath, len, pem); mbedtls_x509write_crt_free(&cert); mbedtls_mpi_free(&serial); mbedtls_pk_free(&key); return 0; } int main(int argc, char *argv[]) { urandom_fd = open("/dev/urandom", O_RDONLY); if (!argv[1]) { //Usage } else if (!strcmp(argv[1], "eckey")) { return dokey(false, argv+2); } else if (!strcmp(argv[1], "rsakey")) { return dokey(true, argv+2); } else if (!strcmp(argv[1], "selfsigned")) { return selfsigned(argv+2); } fprintf(stderr, "PX5G X.509 Certificate Generator Utility v" PX5G_VERSION "\n" PX5G_COPY "\nbased on PolarSSL by Christophe Devine and Paul Bakker\n\n"); fprintf(stderr, "Usage: %s [eckey|rsakey|selfsigned]\n", *argv); return 1; } /a> 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277