| /* |
| * Certificate request generation |
| * |
| * Copyright The Mbed TLS Contributors |
| * SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later |
| */ |
| |
| #include "mbedtls/build_info.h" |
| |
| #include "mbedtls/platform.h" |
| /* md.h is included this early since MD_CAN_XXX macros are defined there. */ |
| #include "mbedtls/md.h" |
| |
| #if !defined(MBEDTLS_X509_CSR_WRITE_C) || !defined(MBEDTLS_X509_CRT_PARSE_C) || \ |
| !defined(MBEDTLS_PK_PARSE_C) || !defined(MBEDTLS_MD_CAN_SHA256) || \ |
| !defined(MBEDTLS_ENTROPY_C) || !defined(MBEDTLS_CTR_DRBG_C) || \ |
| !defined(MBEDTLS_PEM_WRITE_C) || !defined(MBEDTLS_FS_IO) || \ |
| !defined(MBEDTLS_MD_C) |
| int main(void) |
| { |
| mbedtls_printf("MBEDTLS_X509_CSR_WRITE_C and/or MBEDTLS_FS_IO and/or " |
| "MBEDTLS_PK_PARSE_C and/or MBEDTLS_MD_CAN_SHA256 and/or " |
| "MBEDTLS_ENTROPY_C and/or MBEDTLS_CTR_DRBG_C " |
| "not defined.\n"); |
| mbedtls_exit(0); |
| } |
| #else |
| |
| #include "mbedtls/x509_csr.h" |
| #include "mbedtls/entropy.h" |
| #include "mbedtls/ctr_drbg.h" |
| #include "mbedtls/error.h" |
| |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <string.h> |
| |
| #define DFL_FILENAME "keyfile.key" |
| #define DFL_PASSWORD NULL |
| #define DFL_DEBUG_LEVEL 0 |
| #define DFL_OUTPUT_FILENAME "cert.req" |
| #define DFL_SUBJECT_NAME "CN=Cert,O=mbed TLS,C=UK" |
| #define DFL_KEY_USAGE 0 |
| #define DFL_FORCE_KEY_USAGE 0 |
| #define DFL_NS_CERT_TYPE 0 |
| #define DFL_FORCE_NS_CERT_TYPE 0 |
| #define DFL_MD_ALG MBEDTLS_MD_SHA256 |
| |
| #define USAGE \ |
| "\n usage: cert_req param=<>...\n" \ |
| "\n acceptable parameters:\n" \ |
| " filename=%%s default: keyfile.key\n" \ |
| " password=%%s default: NULL\n" \ |
| " debug_level=%%d default: 0 (disabled)\n" \ |
| " output_file=%%s default: cert.req\n" \ |
| " subject_name=%%s default: CN=Cert,O=mbed TLS,C=UK\n" \ |
| " san=%%s default: (none)\n" \ |
| " Semicolon-separated-list of values:\n" \ |
| " DNS:value\n" \ |
| " URI:value\n" \ |
| " RFC822:value\n" \ |
| " IP:value (Only IPv4 is supported)\n" \ |
| " DN:list of comma separated key=value pairs\n" \ |
| " key_usage=%%s default: (empty)\n" \ |
| " Comma-separated-list of values:\n" \ |
| " digital_signature\n" \ |
| " non_repudiation\n" \ |
| " key_encipherment\n" \ |
| " data_encipherment\n" \ |
| " key_agreement\n" \ |
| " key_cert_sign\n" \ |
| " crl_sign\n" \ |
| " force_key_usage=0/1 default: off\n" \ |
| " Add KeyUsage even if it is empty\n" \ |
| " ns_cert_type=%%s default: (empty)\n" \ |
| " Comma-separated-list of values:\n" \ |
| " ssl_client\n" \ |
| " ssl_server\n" \ |
| " email\n" \ |
| " object_signing\n" \ |
| " ssl_ca\n" \ |
| " email_ca\n" \ |
| " object_signing_ca\n" \ |
| " force_ns_cert_type=0/1 default: off\n" \ |
| " Add NsCertType even if it is empty\n" \ |
| " md=%%s default: SHA256\n" \ |
| " possible values:\n" \ |
| " MD5, RIPEMD160, SHA1,\n" \ |
| " SHA224, SHA256, SHA384, SHA512\n" \ |
| "\n" |
| |
| |
| /* |
| * global options |
| */ |
| struct options { |
| const char *filename; /* filename of the key file */ |
| const char *password; /* password for the key file */ |
| int debug_level; /* level of debugging */ |
| const char *output_file; /* where to store the constructed key file */ |
| const char *subject_name; /* subject name for certificate request */ |
| mbedtls_x509_san_list *san_list; /* subjectAltName for certificate request */ |
| unsigned char key_usage; /* key usage flags */ |
| int force_key_usage; /* Force adding the KeyUsage extension */ |
| unsigned char ns_cert_type; /* NS cert type */ |
| int force_ns_cert_type; /* Force adding NsCertType extension */ |
| mbedtls_md_type_t md_alg; /* Hash algorithm used for signature. */ |
| } opt; |
| |
| int write_certificate_request(mbedtls_x509write_csr *req, const char *output_file, |
| int (*f_rng)(void *, unsigned char *, size_t), |
| void *p_rng) |
| { |
| int ret; |
| FILE *f; |
| unsigned char output_buf[4096]; |
| size_t len = 0; |
| |
| memset(output_buf, 0, 4096); |
| if ((ret = mbedtls_x509write_csr_pem(req, output_buf, 4096, f_rng, p_rng)) < 0) { |
| return ret; |
| } |
| |
| len = strlen((char *) output_buf); |
| |
| if ((f = fopen(output_file, "w")) == NULL) { |
| return -1; |
| } |
| |
| if (fwrite(output_buf, 1, len, f) != len) { |
| fclose(f); |
| return -1; |
| } |
| |
| fclose(f); |
| |
| return 0; |
| } |
| |
| int main(int argc, char *argv[]) |
| { |
| int ret = 1; |
| int exit_code = MBEDTLS_EXIT_FAILURE; |
| mbedtls_pk_context key; |
| char buf[1024]; |
| int i; |
| char *p, *q, *r; |
| mbedtls_x509write_csr req; |
| mbedtls_entropy_context entropy; |
| mbedtls_ctr_drbg_context ctr_drbg; |
| const char *pers = "csr example app"; |
| mbedtls_x509_san_list *cur, *prev; |
| mbedtls_asn1_named_data *ext_san_dirname = NULL; |
| #if defined(MBEDTLS_X509_CRT_PARSE_C) |
| uint8_t ip[4] = { 0 }; |
| #endif |
| /* |
| * Set to sane values |
| */ |
| mbedtls_x509write_csr_init(&req); |
| mbedtls_pk_init(&key); |
| mbedtls_ctr_drbg_init(&ctr_drbg); |
| memset(buf, 0, sizeof(buf)); |
| mbedtls_entropy_init(&entropy); |
| |
| #if defined(MBEDTLS_USE_PSA_CRYPTO) |
| psa_status_t status = psa_crypto_init(); |
| if (status != PSA_SUCCESS) { |
| mbedtls_fprintf(stderr, "Failed to initialize PSA Crypto implementation: %d\n", |
| (int) status); |
| goto exit; |
| } |
| #endif /* MBEDTLS_USE_PSA_CRYPTO */ |
| |
| if (argc < 2) { |
| usage: |
| mbedtls_printf(USAGE); |
| goto exit; |
| } |
| |
| opt.filename = DFL_FILENAME; |
| opt.password = DFL_PASSWORD; |
| opt.debug_level = DFL_DEBUG_LEVEL; |
| opt.output_file = DFL_OUTPUT_FILENAME; |
| opt.subject_name = DFL_SUBJECT_NAME; |
| opt.key_usage = DFL_KEY_USAGE; |
| opt.force_key_usage = DFL_FORCE_KEY_USAGE; |
| opt.ns_cert_type = DFL_NS_CERT_TYPE; |
| opt.force_ns_cert_type = DFL_FORCE_NS_CERT_TYPE; |
| opt.md_alg = DFL_MD_ALG; |
| opt.san_list = NULL; |
| |
| for (i = 1; i < argc; i++) { |
| p = argv[i]; |
| if ((q = strchr(p, '=')) == NULL) { |
| goto usage; |
| } |
| *q++ = '\0'; |
| if (strcmp(p, "filename") == 0) { |
| opt.filename = q; |
| } else if (strcmp(p, "password") == 0) { |
| opt.password = q; |
| } else if (strcmp(p, "output_file") == 0) { |
| opt.output_file = q; |
| } else if (strcmp(p, "debug_level") == 0) { |
| opt.debug_level = atoi(q); |
| if (opt.debug_level < 0 || opt.debug_level > 65535) { |
| goto usage; |
| } |
| } else if (strcmp(p, "subject_name") == 0) { |
| opt.subject_name = q; |
| } else if (strcmp(p, "san") == 0) { |
| char *subtype_value; |
| prev = NULL; |
| |
| while (q != NULL) { |
| char *semicolon; |
| r = q; |
| |
| /* Find the first non-escaped ; occurrence and remove escaped ones */ |
| do { |
| if ((semicolon = strchr(r, ';')) != NULL) { |
| if (*(semicolon-1) != '\\') { |
| r = semicolon; |
| break; |
| } |
| /* Remove the escape character */ |
| size_t size_left = strlen(semicolon); |
| memmove(semicolon-1, semicolon, size_left); |
| *(semicolon + size_left - 1) = '\0'; |
| /* r will now point at the character after the semicolon */ |
| r = semicolon; |
| } |
| |
| } while (semicolon != NULL); |
| |
| if (semicolon != NULL) { |
| *r++ = '\0'; |
| } else { |
| r = NULL; |
| } |
| |
| cur = mbedtls_calloc(1, sizeof(mbedtls_x509_san_list)); |
| if (cur == NULL) { |
| mbedtls_printf("Not enough memory for subjectAltName list\n"); |
| goto usage; |
| } |
| |
| cur->next = NULL; |
| |
| if ((subtype_value = strchr(q, ':')) != NULL) { |
| *subtype_value++ = '\0'; |
| } else { |
| mbedtls_printf( |
| "Invalid argument for option SAN: Entry must be of the form TYPE:value\n"); |
| goto usage; |
| } |
| if (strcmp(q, "RFC822") == 0) { |
| cur->node.type = MBEDTLS_X509_SAN_RFC822_NAME; |
| } else if (strcmp(q, "URI") == 0) { |
| cur->node.type = MBEDTLS_X509_SAN_UNIFORM_RESOURCE_IDENTIFIER; |
| } else if (strcmp(q, "DNS") == 0) { |
| cur->node.type = MBEDTLS_X509_SAN_DNS_NAME; |
| } else if (strcmp(q, "IP") == 0) { |
| size_t ip_addr_len = 0; |
| cur->node.type = MBEDTLS_X509_SAN_IP_ADDRESS; |
| ip_addr_len = mbedtls_x509_crt_parse_cn_inet_pton(subtype_value, ip); |
| if (ip_addr_len == 0) { |
| mbedtls_printf("mbedtls_x509_crt_parse_cn_inet_pton failed to parse %s\n", |
| subtype_value); |
| goto exit; |
| } |
| cur->node.san.unstructured_name.p = (unsigned char *) ip; |
| cur->node.san.unstructured_name.len = sizeof(ip); |
| } else if (strcmp(q, "DN") == 0) { |
| cur->node.type = MBEDTLS_X509_SAN_DIRECTORY_NAME; |
| if ((ret = mbedtls_x509_string_to_names(&ext_san_dirname, |
| subtype_value)) != 0) { |
| mbedtls_strerror(ret, buf, sizeof(buf)); |
| mbedtls_printf( |
| " failed\n ! mbedtls_x509_string_to_names " |
| "returned -0x%04x - %s\n\n", |
| (unsigned int) -ret, buf); |
| goto exit; |
| } |
| cur->node.san.directory_name = *ext_san_dirname; |
| } else { |
| mbedtls_free(cur); |
| goto usage; |
| } |
| |
| if (cur->node.type == MBEDTLS_X509_SAN_RFC822_NAME || |
| cur->node.type == MBEDTLS_X509_SAN_UNIFORM_RESOURCE_IDENTIFIER || |
| cur->node.type == MBEDTLS_X509_SAN_DNS_NAME) { |
| q = subtype_value; |
| cur->node.san.unstructured_name.p = (unsigned char *) q; |
| cur->node.san.unstructured_name.len = strlen(q); |
| } |
| |
| if (prev == NULL) { |
| opt.san_list = cur; |
| } else { |
| prev->next = cur; |
| } |
| |
| prev = cur; |
| q = r; |
| } |
| } else if (strcmp(p, "md") == 0) { |
| const mbedtls_md_info_t *md_info = |
| mbedtls_md_info_from_string(q); |
| if (md_info == NULL) { |
| mbedtls_printf("Invalid argument for option %s\n", p); |
| goto usage; |
| } |
| opt.md_alg = mbedtls_md_get_type(md_info); |
| } else if (strcmp(p, "key_usage") == 0) { |
| while (q != NULL) { |
| if ((r = strchr(q, ',')) != NULL) { |
| *r++ = '\0'; |
| } |
| |
| if (strcmp(q, "digital_signature") == 0) { |
| opt.key_usage |= MBEDTLS_X509_KU_DIGITAL_SIGNATURE; |
| } else if (strcmp(q, "non_repudiation") == 0) { |
| opt.key_usage |= MBEDTLS_X509_KU_NON_REPUDIATION; |
| } else if (strcmp(q, "key_encipherment") == 0) { |
| opt.key_usage |= MBEDTLS_X509_KU_KEY_ENCIPHERMENT; |
| } else if (strcmp(q, "data_encipherment") == 0) { |
| opt.key_usage |= MBEDTLS_X509_KU_DATA_ENCIPHERMENT; |
| } else if (strcmp(q, "key_agreement") == 0) { |
| opt.key_usage |= MBEDTLS_X509_KU_KEY_AGREEMENT; |
| } else if (strcmp(q, "key_cert_sign") == 0) { |
| opt.key_usage |= MBEDTLS_X509_KU_KEY_CERT_SIGN; |
| } else if (strcmp(q, "crl_sign") == 0) { |
| opt.key_usage |= MBEDTLS_X509_KU_CRL_SIGN; |
| } else { |
| goto usage; |
| } |
| |
| q = r; |
| } |
| } else if (strcmp(p, "force_key_usage") == 0) { |
| switch (atoi(q)) { |
| case 0: opt.force_key_usage = 0; break; |
| case 1: opt.force_key_usage = 1; break; |
| default: goto usage; |
| } |
| } else if (strcmp(p, "ns_cert_type") == 0) { |
| while (q != NULL) { |
| if ((r = strchr(q, ',')) != NULL) { |
| *r++ = '\0'; |
| } |
| |
| if (strcmp(q, "ssl_client") == 0) { |
| opt.ns_cert_type |= MBEDTLS_X509_NS_CERT_TYPE_SSL_CLIENT; |
| } else if (strcmp(q, "ssl_server") == 0) { |
| opt.ns_cert_type |= MBEDTLS_X509_NS_CERT_TYPE_SSL_SERVER; |
| } else if (strcmp(q, "email") == 0) { |
| opt.ns_cert_type |= MBEDTLS_X509_NS_CERT_TYPE_EMAIL; |
| } else if (strcmp(q, "object_signing") == 0) { |
| opt.ns_cert_type |= MBEDTLS_X509_NS_CERT_TYPE_OBJECT_SIGNING; |
| } else if (strcmp(q, "ssl_ca") == 0) { |
| opt.ns_cert_type |= MBEDTLS_X509_NS_CERT_TYPE_SSL_CA; |
| } else if (strcmp(q, "email_ca") == 0) { |
| opt.ns_cert_type |= MBEDTLS_X509_NS_CERT_TYPE_EMAIL_CA; |
| } else if (strcmp(q, "object_signing_ca") == 0) { |
| opt.ns_cert_type |= MBEDTLS_X509_NS_CERT_TYPE_OBJECT_SIGNING_CA; |
| } else { |
| goto usage; |
| } |
| |
| q = r; |
| } |
| } else if (strcmp(p, "force_ns_cert_type") == 0) { |
| switch (atoi(q)) { |
| case 0: opt.force_ns_cert_type = 0; break; |
| case 1: opt.force_ns_cert_type = 1; break; |
| default: goto usage; |
| } |
| } else { |
| goto usage; |
| } |
| } |
| |
| /* Set the MD algorithm to use for the signature in the CSR */ |
| mbedtls_x509write_csr_set_md_alg(&req, opt.md_alg); |
| |
| /* Set the Key Usage Extension flags in the CSR */ |
| if (opt.key_usage || opt.force_key_usage == 1) { |
| ret = mbedtls_x509write_csr_set_key_usage(&req, opt.key_usage); |
| |
| if (ret != 0) { |
| mbedtls_printf(" failed\n ! mbedtls_x509write_csr_set_key_usage returned %d", ret); |
| goto exit; |
| } |
| } |
| |
| /* Set the Cert Type flags in the CSR */ |
| if (opt.ns_cert_type || opt.force_ns_cert_type == 1) { |
| ret = mbedtls_x509write_csr_set_ns_cert_type(&req, opt.ns_cert_type); |
| |
| if (ret != 0) { |
| mbedtls_printf(" failed\n ! mbedtls_x509write_csr_set_ns_cert_type returned %d", ret); |
| goto exit; |
| } |
| } |
| |
| /* Set the SubjectAltName in the CSR */ |
| if (opt.san_list != NULL) { |
| ret = mbedtls_x509write_csr_set_subject_alternative_name(&req, opt.san_list); |
| |
| if (ret != 0) { |
| mbedtls_printf( |
| " failed\n ! mbedtls_x509write_csr_set_subject_alternative_name returned %d", |
| ret); |
| goto exit; |
| } |
| } |
| |
| /* |
| * 0. Seed the PRNG |
| */ |
| mbedtls_printf(" . Seeding the random number generator..."); |
| fflush(stdout); |
| |
| if ((ret = mbedtls_ctr_drbg_seed(&ctr_drbg, mbedtls_entropy_func, &entropy, |
| (const unsigned char *) pers, |
| strlen(pers))) != 0) { |
| mbedtls_printf(" failed\n ! mbedtls_ctr_drbg_seed returned %d", ret); |
| goto exit; |
| } |
| |
| mbedtls_printf(" ok\n"); |
| |
| /* |
| * 1.0. Check the subject name for validity |
| */ |
| mbedtls_printf(" . Checking subject name..."); |
| fflush(stdout); |
| |
| if ((ret = mbedtls_x509write_csr_set_subject_name(&req, opt.subject_name)) != 0) { |
| mbedtls_printf(" failed\n ! mbedtls_x509write_csr_set_subject_name returned %d", ret); |
| goto exit; |
| } |
| |
| mbedtls_printf(" ok\n"); |
| |
| /* |
| * 1.1. Load the key |
| */ |
| mbedtls_printf(" . Loading the private key ..."); |
| fflush(stdout); |
| |
| ret = mbedtls_pk_parse_keyfile(&key, opt.filename, opt.password, |
| mbedtls_ctr_drbg_random, &ctr_drbg); |
| |
| if (ret != 0) { |
| mbedtls_printf(" failed\n ! mbedtls_pk_parse_keyfile returned %d", ret); |
| goto exit; |
| } |
| |
| mbedtls_x509write_csr_set_key(&req, &key); |
| |
| mbedtls_printf(" ok\n"); |
| |
| /* |
| * 1.2. Writing the request |
| */ |
| mbedtls_printf(" . Writing the certificate request ..."); |
| fflush(stdout); |
| |
| if ((ret = write_certificate_request(&req, opt.output_file, |
| mbedtls_ctr_drbg_random, &ctr_drbg)) != 0) { |
| mbedtls_printf(" failed\n ! write_certificate_request %d", ret); |
| goto exit; |
| } |
| |
| mbedtls_printf(" ok\n"); |
| |
| exit_code = MBEDTLS_EXIT_SUCCESS; |
| |
| exit: |
| |
| if (exit_code != MBEDTLS_EXIT_SUCCESS) { |
| #ifdef MBEDTLS_ERROR_C |
| mbedtls_strerror(ret, buf, sizeof(buf)); |
| mbedtls_printf(" - %s\n", buf); |
| #else |
| mbedtls_printf("\n"); |
| #endif |
| } |
| |
| mbedtls_x509write_csr_free(&req); |
| mbedtls_asn1_free_named_data_list(&ext_san_dirname); |
| mbedtls_pk_free(&key); |
| mbedtls_ctr_drbg_free(&ctr_drbg); |
| mbedtls_entropy_free(&entropy); |
| #if defined(MBEDTLS_USE_PSA_CRYPTO) |
| mbedtls_psa_crypto_free(); |
| #endif /* MBEDTLS_USE_PSA_CRYPTO */ |
| |
| cur = opt.san_list; |
| while (cur != NULL) { |
| prev = cur; |
| cur = cur->next; |
| mbedtls_free(prev); |
| } |
| |
| |
| mbedtls_exit(exit_code); |
| } |
| #endif /* MBEDTLS_X509_CSR_WRITE_C && MBEDTLS_PK_PARSE_C && MBEDTLS_FS_IO && |
| MBEDTLS_ENTROPY_C && MBEDTLS_CTR_DRBG_C && MBEDTLS_PEM_WRITE_C */ |
