Squashed 'lib/mbedtls/external/mbedtls/' content from commit 2ca6c285a0dd

git-subtree-dir: lib/mbedtls/external/mbedtls
git-subtree-split: 2ca6c285a0dd3f33982dd57299012dacab1ff206

1 files changed, 331 insertions, 0 deletions

diff --git a/library/x509write_csr.c b/library/x509write_csr.c
new file mode 100644
index 00000000000..d3ddbcc03d2
--- /dev/null
+++ b/library/x509write_csr.c
@@ -0,0 +1,331 @@
+/*
+ *  X.509 Certificate Signing Request writing
+ *
+ *  Copyright The Mbed TLS Contributors
+ *  SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later
+ */
+/*
+ * References:
+ * - CSRs: PKCS#10 v1.7 aka RFC 2986
+ * - attributes: PKCS#9 v2.0 aka RFC 2985
+ */
+
+#include "common.h"
+
+#if defined(MBEDTLS_X509_CSR_WRITE_C)
+
+#include "x509_internal.h"
+#include "mbedtls/x509_csr.h"
+#include "mbedtls/asn1write.h"
+#include "mbedtls/error.h"
+#include "mbedtls/oid.h"
+#include "mbedtls/platform_util.h"
+
+#if defined(MBEDTLS_USE_PSA_CRYPTO)
+#include "psa/crypto.h"
+#include "psa_util_internal.h"
+#include "mbedtls/psa_util.h"
+#endif /* MBEDTLS_USE_PSA_CRYPTO */
+
+#include <string.h>
+#include <stdlib.h>
+
+#if defined(MBEDTLS_PEM_WRITE_C)
+#include "mbedtls/pem.h"
+#endif
+
+#include "mbedtls/platform.h"
+
+void mbedtls_x509write_csr_init(mbedtls_x509write_csr *ctx)
+{
+    memset(ctx, 0, sizeof(mbedtls_x509write_csr));
+}
+
+void mbedtls_x509write_csr_free(mbedtls_x509write_csr *ctx)
+{
+    mbedtls_asn1_free_named_data_list(&ctx->subject);
+    mbedtls_asn1_free_named_data_list(&ctx->extensions);
+
+    mbedtls_platform_zeroize(ctx, sizeof(mbedtls_x509write_csr));
+}
+
+void mbedtls_x509write_csr_set_md_alg(mbedtls_x509write_csr *ctx, mbedtls_md_type_t md_alg)
+{
+    ctx->md_alg = md_alg;
+}
+
+void mbedtls_x509write_csr_set_key(mbedtls_x509write_csr *ctx, mbedtls_pk_context *key)
+{
+    ctx->key = key;
+}
+
+int mbedtls_x509write_csr_set_subject_name(mbedtls_x509write_csr *ctx,
+                                           const char *subject_name)
+{
+    return mbedtls_x509_string_to_names(&ctx->subject, subject_name);
+}
+
+int mbedtls_x509write_csr_set_extension(mbedtls_x509write_csr *ctx,
+                                        const char *oid, size_t oid_len,
+                                        int critical,
+                                        const unsigned char *val, size_t val_len)
+{
+    return mbedtls_x509_set_extension(&ctx->extensions, oid, oid_len,
+                                      critical, val, val_len);
+}
+
+int mbedtls_x509write_csr_set_subject_alternative_name(mbedtls_x509write_csr *ctx,
+                                                       const mbedtls_x509_san_list *san_list)
+{
+    return mbedtls_x509_write_set_san_common(&ctx->extensions, san_list);
+}
+
+int mbedtls_x509write_csr_set_key_usage(mbedtls_x509write_csr *ctx, unsigned char key_usage)
+{
+    unsigned char buf[4] = { 0 };
+    unsigned char *c;
+    int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
+
+    c = buf + 4;
+
+    ret = mbedtls_asn1_write_named_bitstring(&c, buf, &key_usage, 8);
+    if (ret < 3 || ret > 4) {
+        return ret;
+    }
+
+    ret = mbedtls_x509write_csr_set_extension(ctx, MBEDTLS_OID_KEY_USAGE,
+                                              MBEDTLS_OID_SIZE(MBEDTLS_OID_KEY_USAGE),
+                                              0, c, (size_t) ret);
+    if (ret != 0) {
+        return ret;
+    }
+
+    return 0;
+}
+
+int mbedtls_x509write_csr_set_ns_cert_type(mbedtls_x509write_csr *ctx,
+                                           unsigned char ns_cert_type)
+{
+    unsigned char buf[4] = { 0 };
+    unsigned char *c;
+    int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
+
+    c = buf + 4;
+
+    ret = mbedtls_asn1_write_named_bitstring(&c, buf, &ns_cert_type, 8);
+    if (ret < 3 || ret > 4) {
+        return ret;
+    }
+
+    ret = mbedtls_x509write_csr_set_extension(ctx, MBEDTLS_OID_NS_CERT_TYPE,
+                                              MBEDTLS_OID_SIZE(MBEDTLS_OID_NS_CERT_TYPE),
+                                              0, c, (size_t) ret);
+    if (ret != 0) {
+        return ret;
+    }
+
+    return 0;
+}
+
+static int x509write_csr_der_internal(mbedtls_x509write_csr *ctx,
+                                      unsigned char *buf,
+                                      size_t size,
+                                      unsigned char *sig, size_t sig_size,
+                                      int (*f_rng)(void *, unsigned char *, size_t),
+                                      void *p_rng)
+{
+    int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
+    const char *sig_oid;
+    size_t sig_oid_len = 0;
+    unsigned char *c, *c2;
+    unsigned char hash[MBEDTLS_MD_MAX_SIZE];
+    size_t pub_len = 0, sig_and_oid_len = 0, sig_len;
+    size_t len = 0;
+    mbedtls_pk_type_t pk_alg;
+#if defined(MBEDTLS_USE_PSA_CRYPTO)
+    size_t hash_len;
+    psa_algorithm_t hash_alg = mbedtls_md_psa_alg_from_type(ctx->md_alg);
+#endif /* MBEDTLS_USE_PSA_CRYPTO */
+
+    /* Write the CSR backwards starting from the end of buf */
+    c = buf + size;
+
+    MBEDTLS_ASN1_CHK_ADD(len, mbedtls_x509_write_extensions(&c, buf,
+                                                            ctx->extensions));
+
+    if (len) {
+        MBEDTLS_ASN1_CHK_ADD(len, mbedtls_asn1_write_len(&c, buf, len));
+        MBEDTLS_ASN1_CHK_ADD(len,
+                             mbedtls_asn1_write_tag(
+                                 &c, buf,
+                                 MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE));
+
+        MBEDTLS_ASN1_CHK_ADD(len, mbedtls_asn1_write_len(&c, buf, len));
+        MBEDTLS_ASN1_CHK_ADD(len,
+                             mbedtls_asn1_write_tag(
+                                 &c, buf,
+                                 MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SET));
+
+        MBEDTLS_ASN1_CHK_ADD(len,
+                             mbedtls_asn1_write_oid(
+                                 &c, buf, MBEDTLS_OID_PKCS9_CSR_EXT_REQ,
+                                 MBEDTLS_OID_SIZE(MBEDTLS_OID_PKCS9_CSR_EXT_REQ)));
+
+        MBEDTLS_ASN1_CHK_ADD(len, mbedtls_asn1_write_len(&c, buf, len));
+        MBEDTLS_ASN1_CHK_ADD(len,
+                             mbedtls_asn1_write_tag(
+                                 &c, buf,
+                                 MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE));
+    }
+
+    MBEDTLS_ASN1_CHK_ADD(len, mbedtls_asn1_write_len(&c, buf, len));
+    MBEDTLS_ASN1_CHK_ADD(len,
+                         mbedtls_asn1_write_tag(
+                             &c, buf,
+                             MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_CONTEXT_SPECIFIC));
+
+    MBEDTLS_ASN1_CHK_ADD(pub_len, mbedtls_pk_write_pubkey_der(ctx->key,
+                                                              buf, (size_t) (c - buf)));
+    c -= pub_len;
+    len += pub_len;
+
+    /*
+     *  Subject  ::=  Name
+     */
+    MBEDTLS_ASN1_CHK_ADD(len, mbedtls_x509_write_names(&c, buf,
+                                                       ctx->subject));
+
+    /*
+     *  Version  ::=  INTEGER  {  v1(0), v2(1), v3(2)  }
+     */
+    MBEDTLS_ASN1_CHK_ADD(len, mbedtls_asn1_write_int(&c, buf, 0));
+
+    MBEDTLS_ASN1_CHK_ADD(len, mbedtls_asn1_write_len(&c, buf, len));
+    MBEDTLS_ASN1_CHK_ADD(len,
+                         mbedtls_asn1_write_tag(
+                             &c, buf,
+                             MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE));
+
+    /*
+     * Sign the written CSR data into the sig buffer
+     * Note: hash errors can happen only after an internal error
+     */
+#if defined(MBEDTLS_USE_PSA_CRYPTO)
+    if (psa_hash_compute(hash_alg,
+                         c,
+                         len,
+                         hash,
+                         sizeof(hash),
+                         &hash_len) != PSA_SUCCESS) {
+        return MBEDTLS_ERR_PLATFORM_HW_ACCEL_FAILED;
+    }
+#else /* MBEDTLS_USE_PSA_CRYPTO */
+    ret = mbedtls_md(mbedtls_md_info_from_type(ctx->md_alg), c, len, hash);
+    if (ret != 0) {
+        return ret;
+    }
+#endif
+    if ((ret = mbedtls_pk_sign(ctx->key, ctx->md_alg, hash, 0,
+                               sig, sig_size, &sig_len,
+                               f_rng, p_rng)) != 0) {
+        return ret;
+    }
+
+    if (mbedtls_pk_can_do(ctx->key, MBEDTLS_PK_RSA)) {
+        pk_alg = MBEDTLS_PK_RSA;
+    } else if (mbedtls_pk_can_do(ctx->key, MBEDTLS_PK_ECDSA)) {
+        pk_alg = MBEDTLS_PK_ECDSA;
+    } else {
+        return MBEDTLS_ERR_X509_INVALID_ALG;
+    }
+
+    if ((ret = mbedtls_oid_get_oid_by_sig_alg(pk_alg, ctx->md_alg,
+                                              &sig_oid, &sig_oid_len)) != 0) {
+        return ret;
+    }
+
+    /*
+     * Move the written CSR data to the start of buf to create space for
+     * writing the signature into buf.
+     */
+    memmove(buf, c, len);
+
+    /*
+     * Write sig and its OID into buf backwards from the end of buf.
+     * Note: mbedtls_x509_write_sig will check for c2 - ( buf + len ) < sig_len
+     * and return MBEDTLS_ERR_ASN1_BUF_TOO_SMALL if needed.
+     */
+    c2 = buf + size;
+    MBEDTLS_ASN1_CHK_ADD(sig_and_oid_len,
+                         mbedtls_x509_write_sig(&c2, buf + len, sig_oid, sig_oid_len,
+                                                sig, sig_len, pk_alg));
+
+    /*
+     * Compact the space between the CSR data and signature by moving the
+     * CSR data to the start of the signature.
+     */
+    c2 -= len;
+    memmove(c2, buf, len);
+
+    /* ASN encode the total size and tag the CSR data with it. */
+    len += sig_and_oid_len;
+    MBEDTLS_ASN1_CHK_ADD(len, mbedtls_asn1_write_len(&c2, buf, len));
+    MBEDTLS_ASN1_CHK_ADD(len,
+                         mbedtls_asn1_write_tag(
+                             &c2, buf,
+                             MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE));
+
+    /* Zero the unused bytes at the start of buf */
+    memset(buf, 0, (size_t) (c2 - buf));
+
+    return (int) len;
+}
+
+int mbedtls_x509write_csr_der(mbedtls_x509write_csr *ctx, unsigned char *buf,
+                              size_t size,
+                              int (*f_rng)(void *, unsigned char *, size_t),
+                              void *p_rng)
+{
+    int ret;
+    unsigned char *sig;
+
+    if ((sig = mbedtls_calloc(1, MBEDTLS_PK_SIGNATURE_MAX_SIZE)) == NULL) {
+        return MBEDTLS_ERR_X509_ALLOC_FAILED;
+    }
+
+    ret = x509write_csr_der_internal(ctx, buf, size,
+                                     sig, MBEDTLS_PK_SIGNATURE_MAX_SIZE,
+                                     f_rng, p_rng);
+
+    mbedtls_free(sig);
+
+    return ret;
+}
+
+#define PEM_BEGIN_CSR           "-----BEGIN CERTIFICATE REQUEST-----\n"
+#define PEM_END_CSR             "-----END CERTIFICATE REQUEST-----\n"
+
+#if defined(MBEDTLS_PEM_WRITE_C)
+int mbedtls_x509write_csr_pem(mbedtls_x509write_csr *ctx, unsigned char *buf, size_t size,
+                              int (*f_rng)(void *, unsigned char *, size_t),
+                              void *p_rng)
+{
+    int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
+    size_t olen = 0;
+
+    if ((ret = mbedtls_x509write_csr_der(ctx, buf, size,
+                                         f_rng, p_rng)) < 0) {
+        return ret;
+    }
+
+    if ((ret = mbedtls_pem_write_buffer(PEM_BEGIN_CSR, PEM_END_CSR,
+                                        buf + size - ret,
+                                        ret, buf, size, &olen)) != 0) {
+        return ret;
+    }
+
+    return 0;
+}
+#endif /* MBEDTLS_PEM_WRITE_C */
+
+#endif /* MBEDTLS_X509_CSR_WRITE_C */