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-rw-r--r--programs/x509/cert_req.c514
1 files changed, 514 insertions, 0 deletions
diff --git a/programs/x509/cert_req.c b/programs/x509/cert_req.c
new file mode 100644
index 00000000000..dcfd1765c39
--- /dev/null
+++ b/programs/x509/cert_req.c
@@ -0,0 +1,514 @@
+/*
+ * 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 */
generated by cgit v1.2.3 (git 2.0.4) at 2025-09-20 16:55:48 +0000