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Diffstat (limited to 'package/utils/px5g/px5g.c')
| -rw-r--r-- | package/utils/px5g/px5g.c | 273 |
1 files changed, 273 insertions, 0 deletions
diff --git a/package/utils/px5g/px5g.c b/package/utils/px5g/px5g.c new file mode 100644 index 0000000..eec8fd3 --- /dev/null +++ b/package/utils/px5g/px5g.c @@ -0,0 +1,273 @@ +/* + * px5g - Embedded x509 key and certificate generator based on PolarSSL + * + * Copyright (C) 2009 Steven Barth <steven@midlink.org> + * Copyright (C) 2014 Felix Fietkau <nbd@openwrt.org> + * + * 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 <sys/types.h> + +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <time.h> +#include <limits.h> +#include <unistd.h> +#include <fcntl.h> +#include <stdbool.h> + +#include <polarssl/bignum.h> +#include <polarssl/x509_crt.h> +#include <polarssl/rsa.h> + +#define PX5G_VERSION "0.2" +#define PX5G_COPY "Copyright (c) 2009 Steven Barth <steven@midlink.org>" +#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 void write_key(pk_context *key, const char *path, bool pem) +{ + int len = 0; + + if (pem) { + if (pk_write_key_pem(key, (void *) buf, sizeof(buf)) == 0) + len = strlen(buf); + } else { + len = pk_write_key_der(key, (void *) buf, sizeof(buf)); + if (len < 0) + len = 0; + } + + write_file(path, len, pem); +} + +static void gen_key(pk_context *key, int ksize, int exp, bool pem) +{ + pk_init(key); + pk_init_ctx(key, pk_info_from_type(POLARSSL_PK_RSA)); + fprintf(stderr, "Generating RSA private key, %i bit long modulus\n", ksize); + if (rsa_gen_key(pk_rsa(*key), _urandom, NULL, ksize, exp)) { + fprintf(stderr, "error: key generation failed\n"); + exit(1); + } +} + +int rsakey(char **arg) +{ + pk_context key; + unsigned int ksize = 512; + int exp = 65537; + char *path = NULL; + bool pem = true; + + 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) + ksize = (unsigned int)atoi(*arg); + + gen_key(&key, ksize, exp, pem); + write_key(&key, path, pem); + + pk_free(&key); + + return 0; +} + +int selfsigned(char **arg) +{ + pk_context key; + x509write_cert cert; + 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; + + while (*arg && **arg == '-') { + if (!strcmp(*arg, "-der")) { + pem = false; + } else if (!strcmp(*arg, "-newkey") && arg[1]) { + if (strncmp(arg[1], "rsa:", 4)) { + fprintf(stderr, "error: invalid algorithm"); + return 1; + } + ksize = (unsigned int)atoi(arg[1] + 4); + arg++; + } else if (!strcmp(*arg, "-days") && arg[1]) { + days = (unsigned int)atoi(arg[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, ksize, exp, 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); + + x509write_crt_init(&cert); + x509write_crt_set_md_alg(&cert, POLARSSL_MD_SHA1); + x509write_crt_set_issuer_key(&cert, &key); + x509write_crt_set_subject_key(&cert, &key); + x509write_crt_set_subject_name(&cert, subject); + x509write_crt_set_issuer_name(&cert, subject); + x509write_crt_set_validity(&cert, fstr, tstr); + x509write_crt_set_basic_constraints(&cert, 0, -1); + x509write_crt_set_subject_key_identifier(&cert); + x509write_crt_set_authority_key_identifier(&cert); + + _urandom(NULL, buf, 8); + for (len = 0; len < 8; len++) + sprintf(sstr + len*2, "%02x", (unsigned char) buf[len]); + + mpi_init(&serial); + mpi_read_string(&serial, 16, sstr); + x509write_crt_set_serial(&cert, &serial); + + if (pem) { + if (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 = 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); + + x509write_crt_free(&cert); + mpi_free(&serial); + 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], "rsakey")) { + return rsakey(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 [rsakey|selfsigned]\n", *argv); + return 1; +} |