diff options
Diffstat (limited to 'thirdparty/mbedtls/library/x509write.c')
| -rw-r--r-- | thirdparty/mbedtls/library/x509write.c | 174 |
1 files changed, 174 insertions, 0 deletions
diff --git a/thirdparty/mbedtls/library/x509write.c b/thirdparty/mbedtls/library/x509write.c new file mode 100644 index 0000000000..4704900d38 --- /dev/null +++ b/thirdparty/mbedtls/library/x509write.c @@ -0,0 +1,174 @@ +/* + * X.509 internal, common functions for writing + * + * Copyright The Mbed TLS Contributors + * SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later + */ +#include "common.h" +#if defined(MBEDTLS_X509_CSR_WRITE_C) || defined(MBEDTLS_X509_CRT_WRITE_C) + +#include "mbedtls/x509_crt.h" +#include "x509_internal.h" +#include "mbedtls/asn1write.h" +#include "mbedtls/error.h" +#include "mbedtls/oid.h" +#include "mbedtls/platform.h" +#include "mbedtls/platform_util.h" + +#include <string.h> +#include <stdint.h> + +#if defined(MBEDTLS_PEM_WRITE_C) +#include "mbedtls/pem.h" +#endif /* MBEDTLS_PEM_WRITE_C */ + +#if defined(MBEDTLS_USE_PSA_CRYPTO) +#include "psa/crypto.h" +#include "mbedtls/psa_util.h" +#include "md_psa.h" +#endif /* MBEDTLS_USE_PSA_CRYPTO */ + +#define CHECK_OVERFLOW_ADD(a, b) \ + do \ + { \ + if (a > SIZE_MAX - (b)) \ + { \ + return MBEDTLS_ERR_X509_BAD_INPUT_DATA; \ + } \ + a += b; \ + } while (0) + +int mbedtls_x509_write_set_san_common(mbedtls_asn1_named_data **extensions, + const mbedtls_x509_san_list *san_list) +{ + int ret = 0; + const mbedtls_x509_san_list *cur; + unsigned char *buf; + unsigned char *p; + size_t len; + size_t buflen = 0; + + /* Determine the maximum size of the SubjectAltName list */ + for (cur = san_list; cur != NULL; cur = cur->next) { + /* Calculate size of the required buffer */ + switch (cur->node.type) { + case MBEDTLS_X509_SAN_DNS_NAME: + case MBEDTLS_X509_SAN_UNIFORM_RESOURCE_IDENTIFIER: + case MBEDTLS_X509_SAN_IP_ADDRESS: + case MBEDTLS_X509_SAN_RFC822_NAME: + /* length of value for each name entry, + * maximum 4 bytes for the length field, + * 1 byte for the tag/type. + */ + CHECK_OVERFLOW_ADD(buflen, cur->node.san.unstructured_name.len); + CHECK_OVERFLOW_ADD(buflen, 4 + 1); + break; + case MBEDTLS_X509_SAN_DIRECTORY_NAME: + { + const mbedtls_asn1_named_data *chunk = &cur->node.san.directory_name; + while (chunk != NULL) { + // Max 4 bytes for length, +1 for tag, + // additional 4 max for length, +1 for tag. + // See x509_write_name for more information. + CHECK_OVERFLOW_ADD(buflen, 4 + 1 + 4 + 1); + CHECK_OVERFLOW_ADD(buflen, chunk->oid.len); + CHECK_OVERFLOW_ADD(buflen, chunk->val.len); + chunk = chunk->next; + } + CHECK_OVERFLOW_ADD(buflen, 4 + 1); + break; + } + default: + /* Not supported - return. */ + return MBEDTLS_ERR_X509_FEATURE_UNAVAILABLE; + } + } + + /* Add the extra length field and tag */ + CHECK_OVERFLOW_ADD(buflen, 4 + 1); + + /* Allocate buffer */ + buf = mbedtls_calloc(1, buflen); + if (buf == NULL) { + return MBEDTLS_ERR_ASN1_ALLOC_FAILED; + } + p = buf + buflen; + + /* Write ASN.1-based structure */ + cur = san_list; + len = 0; + while (cur != NULL) { + size_t single_san_len = 0; + switch (cur->node.type) { + case MBEDTLS_X509_SAN_DNS_NAME: + case MBEDTLS_X509_SAN_RFC822_NAME: + case MBEDTLS_X509_SAN_UNIFORM_RESOURCE_IDENTIFIER: + case MBEDTLS_X509_SAN_IP_ADDRESS: + { + const unsigned char *unstructured_name = + (const unsigned char *) cur->node.san.unstructured_name.p; + size_t unstructured_name_len = cur->node.san.unstructured_name.len; + + MBEDTLS_ASN1_CHK_CLEANUP_ADD(single_san_len, + mbedtls_asn1_write_raw_buffer( + &p, buf, + unstructured_name, unstructured_name_len)); + MBEDTLS_ASN1_CHK_CLEANUP_ADD(single_san_len, mbedtls_asn1_write_len( + &p, buf, unstructured_name_len)); + MBEDTLS_ASN1_CHK_CLEANUP_ADD(single_san_len, + mbedtls_asn1_write_tag( + &p, buf, + MBEDTLS_ASN1_CONTEXT_SPECIFIC | cur->node.type)); + } + break; + case MBEDTLS_X509_SAN_DIRECTORY_NAME: + MBEDTLS_ASN1_CHK_CLEANUP_ADD(single_san_len, + mbedtls_x509_write_names(&p, buf, + (mbedtls_asn1_named_data *) & + cur->node + .san.directory_name)); + MBEDTLS_ASN1_CHK_CLEANUP_ADD(single_san_len, + mbedtls_asn1_write_len(&p, buf, single_san_len)); + MBEDTLS_ASN1_CHK_CLEANUP_ADD(single_san_len, + mbedtls_asn1_write_tag(&p, buf, + MBEDTLS_ASN1_CONTEXT_SPECIFIC | + MBEDTLS_ASN1_CONSTRUCTED | + MBEDTLS_X509_SAN_DIRECTORY_NAME)); + break; + default: + /* Error out on an unsupported SAN */ + ret = MBEDTLS_ERR_X509_FEATURE_UNAVAILABLE; + goto cleanup; + } + cur = cur->next; + /* check for overflow */ + if (len > SIZE_MAX - single_san_len) { + ret = MBEDTLS_ERR_X509_BAD_INPUT_DATA; + goto cleanup; + } + len += single_san_len; + } + + MBEDTLS_ASN1_CHK_CLEANUP_ADD(len, mbedtls_asn1_write_len(&p, buf, len)); + MBEDTLS_ASN1_CHK_CLEANUP_ADD(len, + mbedtls_asn1_write_tag(&p, buf, + MBEDTLS_ASN1_CONSTRUCTED | + MBEDTLS_ASN1_SEQUENCE)); + + ret = mbedtls_x509_set_extension(extensions, + MBEDTLS_OID_SUBJECT_ALT_NAME, + MBEDTLS_OID_SIZE(MBEDTLS_OID_SUBJECT_ALT_NAME), + 0, + buf + buflen - len, len); + + /* If we exceeded the allocated buffer it means that maximum size of the SubjectAltName list + * was incorrectly calculated and memory is corrupted. */ + if (p < buf) { + ret = MBEDTLS_ERR_ASN1_LENGTH_MISMATCH; + } +cleanup: + mbedtls_free(buf); + return ret; +} + +#endif /* MBEDTLS_X509_CSR_WRITE_C || MBEDTLS_X509_CRT_WRITE_C */ |