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#include "audit.h"
#include <stdio.h>
#include <string.h>
#include "util.h"
static void set_err(char **err, const char *msg)
{
if (err && !*err)
*err = xstrdup(msg);
}
static int64_t audit_last_seq(sqlite3 *db)
{
sqlite3_stmt *st = NULL;
int64_t seq = 0;
if (sqlite3_prepare_v2(db, "SELECT seq FROM audit_log ORDER BY seq DESC LIMIT 1",
-1, &st, NULL) == SQLITE_OK &&
sqlite3_step(st) == SQLITE_ROW)
seq = sqlite3_column_int64(st, 0);
sqlite3_finalize(st);
return seq;
}
static void audit_last_hash(sqlite3 *db, unsigned char out[32])
{
memset(out, 0, 32);
sqlite3_stmt *st = NULL;
if (sqlite3_prepare_v2(db, "SELECT hash FROM audit_log ORDER BY seq DESC LIMIT 1",
-1, &st, NULL) == SQLITE_OK &&
sqlite3_step(st) == SQLITE_ROW) {
const void *b = sqlite3_column_blob(st, 0);
if (b && sqlite3_column_bytes(st, 0) == 32)
memcpy(out, b, 32);
}
sqlite3_finalize(st);
}
static void append_str16(struct buf *b, const char *s)
{
size_t n = s ? strlen(s) : 0;
if (n > 0xffff)
n = 0xffff;
buf_append_u16be(b, (uint16_t)n);
buf_append(b, s ? s : "", n);
}
static void append_str32(struct buf *b, const char *s)
{
size_t n = s ? strlen(s) : 0;
buf_append_u32be(b, (uint32_t)n);
buf_append(b, s ? s : "", n);
}
static void audit_hash(const unsigned char prev[32], int64_t seq, const char *at,
int64_t user_id, int64_t token_id, int64_t org_id,
const char *action, const char *request_json,
const char *result_code, unsigned char out[32])
{
struct buf b;
buf_init(&b);
buf_append(&b, "bokf-v1-audit\0", 14);
buf_append(&b, prev, 32);
buf_append_u64be(&b, (uint64_t)seq);
append_str16(&b, at);
buf_append_u64be(&b, (uint64_t)user_id);
buf_append_u64be(&b, (uint64_t)token_id);
buf_append_u64be(&b, (uint64_t)org_id);
append_str16(&b, action);
append_str32(&b, request_json);
append_str16(&b, result_code);
util_sha256(b.p, b.len, out);
buf_free(&b);
}
int audit_append(sqlite3 *db, int64_t org_id, int64_t user_id, int64_t token_id,
const char *action, const char *request_json,
const char *result_code, char **err)
{
unsigned char prev[32], hash[32];
audit_last_hash(db, prev);
int64_t seq = audit_last_seq(db) + 1;
char ts[32];
util_iso8601(util_now(), ts, sizeof ts);
if (!request_json)
request_json = "{}";
audit_hash(prev, seq, ts, user_id, token_id, org_id, action, request_json,
result_code, hash);
sqlite3_stmt *st = NULL;
int rc = sqlite3_prepare_v2(
db,
"INSERT INTO audit_log(seq,org_id,at,actor_user_id,actor_token_id,"
"action,request_json,result_code,hash_prev,hash)"
" VALUES(?1,?2,?3,?4,?5,?6,?7,?8,?9,?10)",
-1, &st, NULL);
if (rc != SQLITE_OK) {
set_err(err, sqlite3_errmsg(db));
return -1;
}
sqlite3_bind_int64(st, 1, seq);
if (org_id)
sqlite3_bind_int64(st, 2, org_id);
else
sqlite3_bind_null(st, 2);
sqlite3_bind_text(st, 3, ts, -1, SQLITE_TRANSIENT);
if (user_id)
sqlite3_bind_int64(st, 4, user_id);
else
sqlite3_bind_null(st, 4);
if (token_id)
sqlite3_bind_int64(st, 5, token_id);
else
sqlite3_bind_null(st, 5);
sqlite3_bind_text(st, 6, action, -1, SQLITE_TRANSIENT);
sqlite3_bind_text(st, 7, request_json, -1, SQLITE_TRANSIENT);
sqlite3_bind_text(st, 8, result_code, -1, SQLITE_TRANSIENT);
sqlite3_bind_blob(st, 9, prev, 32, SQLITE_TRANSIENT);
sqlite3_bind_blob(st, 10, hash, 32, SQLITE_TRANSIENT);
rc = sqlite3_step(st);
sqlite3_finalize(st);
if (rc != SQLITE_DONE) {
set_err(err, sqlite3_errmsg(db));
return -1;
}
return 0;
}
int audit_verify(sqlite3 *db, int64_t *checked, int64_t *bad_seq, char **err)
{
sqlite3_stmt *st = NULL;
int rc = sqlite3_prepare_v2(
db,
"SELECT seq,org_id,at,actor_user_id,actor_token_id,action,request_json,"
"result_code,hash_prev,hash FROM audit_log ORDER BY seq",
-1, &st, NULL);
if (rc != SQLITE_OK) {
set_err(err, sqlite3_errmsg(db));
return -1;
}
unsigned char running[32];
memset(running, 0, 32);
int64_t n = 0;
int broken = 0;
while (sqlite3_step(st) == SQLITE_ROW) {
n++;
int64_t seq = sqlite3_column_int64(st, 0);
int64_t org_id = sqlite3_column_type(st, 1) == SQLITE_NULL
? 0
: sqlite3_column_int64(st, 1);
const char *at = (const char *)sqlite3_column_text(st, 2);
int64_t uid = sqlite3_column_type(st, 3) == SQLITE_NULL
? 0
: sqlite3_column_int64(st, 3);
int64_t tid = sqlite3_column_type(st, 4) == SQLITE_NULL
? 0
: sqlite3_column_int64(st, 4);
const char *action = (const char *)sqlite3_column_text(st, 5);
const char *req = (const char *)sqlite3_column_text(st, 6);
const char *code = (const char *)sqlite3_column_text(st, 7);
const void *hprev = sqlite3_column_blob(st, 8);
int hprev_n = sqlite3_column_bytes(st, 8);
const void *h = sqlite3_column_blob(st, 9);
int h_n = sqlite3_column_bytes(st, 9);
unsigned char expect[32];
audit_hash(running, seq, at ? at : "", uid, tid, org_id,
action ? action : "", req ? req : "", code ? code : "",
expect);
if (hprev_n != 32 || h_n != 32 ||
memcmp(hprev, running, 32) != 0 || memcmp(h, expect, 32) != 0) {
if (bad_seq)
*bad_seq = seq;
broken = 1;
break;
}
memcpy(running, expect, 32);
}
sqlite3_finalize(st);
if (checked)
*checked = n;
return broken ? 1 : 0;
}
char *audit_args_json(yyjson_val *args)
{
if (!args || yyjson_is_null(args))
return xstrdup("{}");
if (!yyjson_is_obj(args)) {
char *s = yyjson_val_write(args, 0, NULL);
return s ? s : xstrdup("{}");
}
yyjson_mut_doc *doc = yyjson_mut_doc_new(NULL);
yyjson_mut_val *out = yyjson_mut_obj(doc);
yyjson_mut_doc_set_root(doc, out);
yyjson_obj_iter it = yyjson_obj_iter_with(args);
yyjson_val *key;
while ((key = yyjson_obj_iter_next(&it))) {
const char *k = yyjson_get_str(key);
yyjson_val *v = yyjson_obj_iter_get_val(key);
if (!k || !v)
continue;
if (strcmp(k, "password") == 0 || strcmp(k, "token") == 0 ||
strcmp(k, "content_base64") == 0 || strcmp(k, "secret") == 0)
continue;
yyjson_mut_val *copy = yyjson_val_mut_copy(doc, v);
if (copy)
yyjson_mut_obj_add(out, yyjson_mut_strcpy(doc, k), copy);
}
char *json = yyjson_mut_write(doc, 0, NULL);
yyjson_mut_doc_free(doc);
return json ? json : xstrdup("{}");
}
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