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keyring_trace.c
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/*
* Copyright 2018 Amazon.com, Inc. or its affiliates. All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License"). You may not use
* this file except in compliance with the License. A copy of the License is
* located at
*
* http://aws.amazon.com/apache2.0/
*
* or in the "license" file accompanying this file. This file is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
* implied. See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <aws/cryptosdk/private/keyring_trace.h>
#include <aws/cryptosdk/private/utils.h>
bool aws_cryptosdk_keyring_trace_is_valid(const struct aws_array_list *trace) {
if (trace == NULL) {
return false;
}
AWS_FATAL_PRECONDITION(trace->item_size == sizeof(struct aws_cryptosdk_keyring_trace_record));
if (!aws_array_list_is_valid(trace)) {
return false;
}
/* iterate over each record in the list */
struct aws_cryptosdk_keyring_trace_record *data = (struct aws_cryptosdk_keyring_trace_record *)trace->data;
for (size_t i = 0; i < trace->length; ++i) {
if (!aws_cryptosdk_keyring_trace_record_is_valid(&(data[i]))) {
return false;
}
}
return true;
}
bool aws_cryptosdk_keyring_trace_record_is_valid(struct aws_cryptosdk_keyring_trace_record *record) {
if (record == NULL) {
return false;
}
bool wk_namespace_is_valid = (record->wrapping_key_namespace != NULL);
bool wk_name_is_valid = (record->wrapping_key_name != NULL);
bool record_readable = AWS_OBJECT_PTR_IS_READABLE(record);
return wk_namespace_is_valid && wk_name_is_valid && record_readable;
}
void aws_cryptosdk_keyring_trace_record_clean_up(struct aws_cryptosdk_keyring_trace_record *record) {
AWS_FATAL_PRECONDITION(record != NULL);
// AWS_FATAL_PRECONDITION(record->wrapping_key_name != NULL);
// AWS_FATAL_PRECONDITION(record->wrapping_key_namespace != NULL);
aws_string_destroy(record->wrapping_key_namespace);
aws_string_destroy(record->wrapping_key_name);
record->flags = 0;
record->wrapping_key_namespace = record->wrapping_key_name = NULL;
AWS_POSTCONDITION(record->flags == 0);
AWS_POSTCONDITION(record->wrapping_key_name == NULL);
AWS_POSTCONDITION(record->wrapping_key_namespace == NULL);
}
static inline int record_init_check(struct aws_cryptosdk_keyring_trace_record *record) {
if (record->wrapping_key_namespace && record->wrapping_key_name) {
return AWS_OP_SUCCESS;
}
aws_cryptosdk_keyring_trace_record_clean_up(record);
return AWS_OP_ERR;
}
static int record_init_from_c_strs(
struct aws_allocator *alloc,
struct aws_cryptosdk_keyring_trace_record *record,
const char *wk_namespace,
const char *wk_name,
uint32_t flags) {
record->flags = flags;
record->wrapping_key_namespace = aws_string_new_from_c_str(alloc, wk_namespace);
record->wrapping_key_name = aws_string_new_from_c_str(alloc, wk_name);
return record_init_check(record);
}
static int record_init_from_strings(
struct aws_allocator *alloc,
struct aws_cryptosdk_keyring_trace_record *record,
const struct aws_string *wk_namespace,
const struct aws_string *wk_name,
uint32_t flags) {
record->flags = flags;
record->wrapping_key_namespace = aws_cryptosdk_string_dup(alloc, wk_namespace);
record->wrapping_key_name = aws_cryptosdk_string_dup(alloc, wk_name);
return record_init_check(record);
}
static int record_init_from_bufs(
struct aws_allocator *alloc,
struct aws_cryptosdk_keyring_trace_record *record,
const struct aws_byte_buf *wk_namespace,
const struct aws_byte_buf *wk_name,
uint32_t flags) {
record->flags = flags;
record->wrapping_key_namespace = aws_string_new_from_array(alloc, wk_namespace->buffer, wk_namespace->len);
record->wrapping_key_name = aws_string_new_from_array(alloc, wk_name->buffer, wk_name->len);
return record_init_check(record);
}
static inline int push_record_onto_trace(
struct aws_array_list *trace, struct aws_cryptosdk_keyring_trace_record *record) {
int ret = aws_array_list_push_back(trace, (void *)record);
if (ret) aws_cryptosdk_keyring_trace_record_clean_up(record);
// TODO: check for post-condition aws_cryptosdk_keyring_trace_is_valid(trace)
return ret;
}
int aws_cryptosdk_keyring_trace_add_record(
struct aws_allocator *alloc,
struct aws_array_list *trace,
const struct aws_string *wk_namespace,
const struct aws_string *wk_name,
uint32_t flags) {
aws_allocator_is_valid(alloc);
AWS_FATAL_PRECONDITION(trace != NULL);
AWS_FATAL_PRECONDITION(aws_string_is_valid(wk_namespace));
AWS_FATAL_PRECONDITION(aws_string_is_valid(wk_name));
AWS_FATAL_PRECONDITION(aws_cryptosdk_keyring_trace_is_valid(trace));
AWS_FATAL_PRECONDITION(trace->item_size == sizeof(struct aws_cryptosdk_keyring_trace_record));
struct aws_cryptosdk_keyring_trace_record record;
int ret = record_init_from_strings(alloc, &record, wk_namespace, wk_name, flags);
if (ret) return ret;
return push_record_onto_trace(trace, &record);
}
int aws_cryptosdk_keyring_trace_add_record_c_str(
struct aws_allocator *alloc,
struct aws_array_list *trace,
const char *wk_namespace,
const char *wk_name,
uint32_t flags) {
aws_allocator_is_valid(alloc);
AWS_FATAL_PRECONDITION(trace != NULL);
AWS_FATAL_PRECONDITION(aws_c_string_is_valid(wk_namespace));
AWS_FATAL_PRECONDITION(aws_c_string_is_valid(wk_name));
AWS_FATAL_PRECONDITION(aws_cryptosdk_keyring_trace_is_valid(trace));
AWS_FATAL_PRECONDITION(trace->item_size == sizeof(struct aws_cryptosdk_keyring_trace_record));
struct aws_cryptosdk_keyring_trace_record record;
int ret = record_init_from_c_strs(alloc, &record, wk_namespace, wk_name, flags);
if (ret) return ret;
return push_record_onto_trace(trace, &record);
}
int aws_cryptosdk_keyring_trace_add_record_buf(
struct aws_allocator *alloc,
struct aws_array_list *trace,
const struct aws_byte_buf *wk_namespace,
const struct aws_byte_buf *wk_name,
uint32_t flags) {
aws_allocator_is_valid(alloc);
AWS_FATAL_PRECONDITION(trace != NULL);
AWS_FATAL_PRECONDITION(wk_namespace != NULL);
AWS_FATAL_PRECONDITION(wk_name != NULL);
AWS_FATAL_PRECONDITION(aws_byte_buf_is_valid(wk_namespace));
AWS_FATAL_PRECONDITION(aws_byte_buf_is_valid(wk_name));
AWS_FATAL_PRECONDITION(aws_cryptosdk_keyring_trace_is_valid(trace));
AWS_FATAL_PRECONDITION(trace->item_size == sizeof(struct aws_cryptosdk_keyring_trace_record));
struct aws_cryptosdk_keyring_trace_record record;
int ret = record_init_from_bufs(alloc, &record, wk_namespace, wk_name, flags);
if (ret) return ret;
return push_record_onto_trace(trace, &record);
}
int aws_cryptosdk_keyring_trace_init(struct aws_allocator *alloc, struct aws_array_list *trace) {
// arbitrary starting point, list will resize as necessary
AWS_FATAL_PRECONDITION(trace != NULL);
aws_allocator_is_valid(alloc);
const int initial_size = 10;
int r_val =
aws_array_list_init_dynamic(trace, alloc, initial_size, sizeof(struct aws_cryptosdk_keyring_trace_record));
if (r_val == AWS_OP_SUCCESS) {
AWS_POSTCONDITION(aws_array_list_is_valid(trace));
AWS_POSTCONDITION(trace->alloc == alloc);
AWS_POSTCONDITION(trace->item_size == sizeof(struct aws_cryptosdk_keyring_trace_record));
AWS_POSTCONDITION(trace->length == 0);
}
return r_val;
}
int aws_cryptosdk_keyring_trace_record_init_clone(
struct aws_allocator *alloc,
struct aws_cryptosdk_keyring_trace_record *dest,
const struct aws_cryptosdk_keyring_trace_record *src) {
aws_allocator_is_valid(alloc);
AWS_FATAL_PRECONDITION(dest != NULL);
AWS_FATAL_PRECONDITION(src != NULL);
AWS_FATAL_PRECONDITION(aws_string_is_valid(src->wrapping_key_namespace));
AWS_FATAL_PRECONDITION(aws_string_is_valid(src->wrapping_key_name));
dest->wrapping_key_namespace = aws_cryptosdk_string_dup(alloc, src->wrapping_key_namespace);
dest->wrapping_key_name = aws_cryptosdk_string_dup(alloc, src->wrapping_key_name);
if (record_init_check(dest)) {
aws_cryptosdk_keyring_trace_record_clean_up(dest);
AWS_POSTCONDITION(dest->flags == 0);
AWS_POSTCONDITION(dest->wrapping_key_name == NULL);
AWS_POSTCONDITION(dest->wrapping_key_namespace == NULL);
return AWS_OP_ERR;
}
dest->flags = src->flags;
AWS_POSTCONDITION(aws_string_eq(src->wrapping_key_namespace, dest->wrapping_key_namespace));
AWS_POSTCONDITION(aws_string_eq(src->wrapping_key_name, dest->wrapping_key_name));
AWS_POSTCONDITION(src->flags == dest->flags);
return AWS_OP_SUCCESS;
}
static bool aws_cryptosdk_keyring_trace_record_eq(
const struct aws_cryptosdk_keyring_trace_record *a, const struct aws_cryptosdk_keyring_trace_record *b) {
return a->flags == b->flags && aws_string_eq(a->wrapping_key_namespace, b->wrapping_key_namespace) &&
aws_string_eq(a->wrapping_key_name, b->wrapping_key_name);
}
bool aws_cryptosdk_keyring_trace_eq(const struct aws_array_list *a, const struct aws_array_list *b) {
AWS_FATAL_PRECONDITION(aws_cryptosdk_keyring_trace_is_valid(a));
AWS_FATAL_PRECONDITION(aws_cryptosdk_keyring_trace_is_valid(b));
size_t num_records = aws_array_list_length(a);
if (num_records != aws_array_list_length(b)) return false;
struct aws_cryptosdk_keyring_trace_record *a_rec;
struct aws_cryptosdk_keyring_trace_record *b_rec;
for (size_t idx = 0; idx < num_records; ++idx) {
if (aws_array_list_get_at_ptr(a, (void **)&a_rec, idx) || aws_array_list_get_at_ptr(b, (void **)&b_rec, idx)) {
abort();
}
if (!aws_cryptosdk_keyring_trace_record_eq(a_rec, b_rec)) return false;
}
return true;
}
void aws_cryptosdk_keyring_trace_clear(struct aws_array_list *trace) {
AWS_FATAL_PRECONDITION(aws_cryptosdk_keyring_trace_is_valid(trace));
AWS_FATAL_PRECONDITION(trace->item_size == sizeof(struct aws_cryptosdk_keyring_trace_record));
size_t num_records = aws_array_list_length(trace);
for (size_t idx = 0; idx < num_records; ++idx) {
struct aws_cryptosdk_keyring_trace_record *record;
if (!aws_array_list_get_at_ptr(trace, (void **)&record, idx)) {
aws_cryptosdk_keyring_trace_record_clean_up(record);
}
}
aws_array_list_clear(trace);
}
void aws_cryptosdk_keyring_trace_clean_up(struct aws_array_list *trace) {
AWS_FATAL_PRECONDITION(aws_cryptosdk_keyring_trace_is_valid(trace));
AWS_FATAL_PRECONDITION(trace->item_size == sizeof(struct aws_cryptosdk_keyring_trace_record));
aws_cryptosdk_keyring_trace_clear(trace);
aws_array_list_clean_up(trace);
}