/* * Copyright 2021-2022 The OpenSSL Project Authors. All Rights Reserved. * * Licensed under the Apache License 2.0 (the "License"). You may not use * this file except in compliance with the License. You can obtain a copy * in the file LICENSE in the source distribution or at * https://www.openssl.org/source/license.html */ #include #include #include #include "internal/param_build_set.h" #define OSSL_PARAM_ALLOCATED_END 127 #define OSSL_PARAM_MERGE_LIST_MAX 128 #define OSSL_PARAM_BUF_PUBLIC 0 #define OSSL_PARAM_BUF_SECURE 1 #define OSSL_PARAM_BUF_MAX (OSSL_PARAM_BUF_SECURE + 1) typedef struct { OSSL_PARAM_ALIGNED_BLOCK *alloc; /* The allocated buffer */ OSSL_PARAM_ALIGNED_BLOCK *cur; /* Current position in the allocated buf */ size_t blocks; /* Number of aligned blocks */ size_t alloc_sz; /* The size of the allocated buffer (in bytes) */ } OSSL_PARAM_BUF; size_t ossl_param_bytes_to_blocks(size_t bytes) { return (bytes + OSSL_PARAM_ALIGN_SIZE - 1) / OSSL_PARAM_ALIGN_SIZE; } static int ossl_param_buf_alloc(OSSL_PARAM_BUF *out, size_t extra_blocks, int is_secure) { size_t sz = OSSL_PARAM_ALIGN_SIZE * (extra_blocks + out->blocks); out->alloc = is_secure ? OPENSSL_secure_zalloc(sz) : OPENSSL_zalloc(sz); if (out->alloc == NULL) return 0; out->alloc_sz = sz; out->cur = out->alloc + extra_blocks; return 1; } void ossl_param_set_secure_block(OSSL_PARAM *last, void *secure_buffer, size_t secure_buffer_sz) { last->key = NULL; last->data_size = secure_buffer_sz; last->data = secure_buffer; last->data_type = OSSL_PARAM_ALLOCATED_END; } static OSSL_PARAM *ossl_param_dup(const OSSL_PARAM *src, OSSL_PARAM *dst, OSSL_PARAM_BUF buf[OSSL_PARAM_BUF_MAX], int *param_count) { const OSSL_PARAM *in; int has_dst = (dst != NULL); int is_secure; size_t param_sz, blks; for (in = src; in->key != NULL; in++) { is_secure = CRYPTO_secure_allocated(in->data); if (has_dst) { *dst = *in; dst->data = buf[is_secure].cur; } if (in->data_type == OSSL_PARAM_OCTET_PTR || in->data_type == OSSL_PARAM_UTF8_PTR) { param_sz = sizeof(in->data); if (has_dst) *((const void **)dst->data) = *(const void **)in->data; } else { param_sz = in->data_size; if (has_dst) memcpy(dst->data, in->data, param_sz); } if (in->data_type == OSSL_PARAM_UTF8_STRING) param_sz++; /* NULL terminator */ blks = ossl_param_bytes_to_blocks(param_sz); if (has_dst) { dst++; buf[is_secure].cur += blks; } else { buf[is_secure].blocks += blks; } if (param_count != NULL) ++*param_count; } return dst; } OSSL_PARAM *OSSL_PARAM_dup(const OSSL_PARAM *src) { size_t param_blocks; OSSL_PARAM_BUF buf[OSSL_PARAM_BUF_MAX]; OSSL_PARAM *last, *dst; int param_count = 1; /* Include terminator in the count */ if (src == NULL) { ERR_raise(ERR_LIB_CRYPTO, ERR_R_PASSED_NULL_PARAMETER); return NULL; } memset(buf, 0, sizeof(buf)); /* First Pass: get the param_count and block sizes required */ (void)ossl_param_dup(src, NULL, buf, ¶m_count); param_blocks = ossl_param_bytes_to_blocks(param_count * sizeof(*src)); /* * The allocated buffer consists of an array of OSSL_PARAM followed by * aligned data bytes that the array elements will point to. */ if (!ossl_param_buf_alloc(&buf[OSSL_PARAM_BUF_PUBLIC], param_blocks, 0)) return NULL; /* Allocate a secure memory buffer if required */ if (buf[OSSL_PARAM_BUF_SECURE].blocks > 0 && !ossl_param_buf_alloc(&buf[OSSL_PARAM_BUF_SECURE], 0, 1)) { OPENSSL_free(buf[OSSL_PARAM_BUF_PUBLIC].alloc); return NULL; } dst = (OSSL_PARAM *)buf[OSSL_PARAM_BUF_PUBLIC].alloc; last = ossl_param_dup(src, dst, buf, NULL); /* Store the allocated secure memory buffer in the last param block */ ossl_param_set_secure_block(last, buf[OSSL_PARAM_BUF_SECURE].alloc, buf[OSSL_PARAM_BUF_SECURE].alloc_sz); return dst; } static int compare_params(const void *left, const void *right) { const OSSL_PARAM *l = *(const OSSL_PARAM **)left; const OSSL_PARAM *r = *(const OSSL_PARAM **)right; return OPENSSL_strcasecmp(l->key, r->key); } OSSL_PARAM *OSSL_PARAM_merge(const OSSL_PARAM *p1, const OSSL_PARAM *p2) { const OSSL_PARAM *list1[OSSL_PARAM_MERGE_LIST_MAX + 1]; const OSSL_PARAM *list2[OSSL_PARAM_MERGE_LIST_MAX + 1]; const OSSL_PARAM *p = NULL; const OSSL_PARAM **p1cur, **p2cur; OSSL_PARAM *params, *dst; size_t list1_sz = 0, list2_sz = 0; int diff; if (p1 == NULL && p2 == NULL) { ERR_raise(ERR_LIB_CRYPTO, ERR_R_PASSED_NULL_PARAMETER); return NULL; } /* Copy p1 to list1 */ if (p1 != NULL) { for (p = p1; p->key != NULL && list1_sz < OSSL_PARAM_MERGE_LIST_MAX; p++) list1[list1_sz++] = p; } list1[list1_sz] = NULL; /* copy p2 to a list2 */ if (p2 != NULL) { for (p = p2; p->key != NULL && list2_sz < OSSL_PARAM_MERGE_LIST_MAX; p++) list2[list2_sz++] = p; } list2[list2_sz] = NULL; if (list1_sz == 0 && list2_sz == 0) { ERR_raise(ERR_LIB_CRYPTO, CRYPTO_R_NO_PARAMS_TO_MERGE); return NULL; } /* Sort the 2 lists */ qsort(list1, list1_sz, sizeof(OSSL_PARAM *), compare_params); qsort(list2, list2_sz, sizeof(OSSL_PARAM *), compare_params); /* Allocate enough space to store the merged parameters */ params = OPENSSL_zalloc((list1_sz + list2_sz + 1) * sizeof(*p1)); if (params == NULL) return NULL; dst = params; p1cur = list1; p2cur = list2; while (1) { /* If list1 is finished just tack list2 onto the end */ if (*p1cur == NULL) { do { *dst++ = **p2cur; p2cur++; } while (*p2cur != NULL); break; } /* If list2 is finished just tack list1 onto the end */ if (*p2cur == NULL) { do { *dst++ = **p1cur; p1cur++; } while (*p1cur != NULL); break; } /* consume the list element with the smaller key */ diff = OPENSSL_strcasecmp((*p1cur)->key, (*p2cur)->key); if (diff == 0) { /* If the keys are the same then throw away the list1 element */ *dst++ = **p2cur; p2cur++; p1cur++; } else if (diff > 0) { *dst++ = **p2cur; p2cur++; } else { *dst++ = **p1cur; p1cur++; } } return params; } void OSSL_PARAM_free(OSSL_PARAM *params) { if (params != NULL) { OSSL_PARAM *p; for (p = params; p->key != NULL; p++) ; if (p->data_type == OSSL_PARAM_ALLOCATED_END) OPENSSL_secure_clear_free(p->data, p->data_size); OPENSSL_free(params); } }