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手机恢复微信聊天记录数据，首先要考虑找到微信聊天数据库，恢复数据库后导出数据，详细描述了导出微信聊天记录的方法，镜像手机emmc存储芯片或者通过数据线读取到数据本文没有描述。
首先，很容易发现数据库在/data/data/com.tencent.mm/MicroMsg/<some id> 下，file之，显示为data…… 好吧看来被腾讯加密了。。
在/data/data/com.tencent.mm/里随便看，发现lib里有个lIBMmcrypto.so，大概就是用来加密的了。nm -D之，发现一堆sqlite3_*；稍微google下，觉得应该是用了sqlcipher。于是只用拿到密钥就好啦。
gdb
希望break到sqlite3_exec之类的函数来看到密钥。发现android自带的gdbserver有问题，attach上去后根本看不到调用栈，不明原因。于是手动编译了静态的arm构架的gdb，push上去，能attach和traceback了；但一旦下断点，目标进程就会蹦，不明原理。此想法失败。
替换掉libmmcrypto.so
希望用自己修改的sqlcipher来替换原来的库，把密钥直接打印出来。花了很多时间，交叉编译了不少东西，但最后微信在使用被换掉的库的情况下总还是要崩……
逆向+肉眼密钥算法
使用apktool逆向微信的app(需要注意的是使用apktol前应该安装framework，否则会各种错误；我在这里耗了好久)。grep 'PRAGMA key'，真的有，前后看了下，发现貌似是把this中的一个东西作为了key。。。没找到生成密钥的算法……
injection
想到修改代码把key直接打出来。google了一会儿，发现了以下方法：
- const-string v1, "!!!!!SQL: "
- invoke-static {v1, p1}, Landroid/util/Log;->d(Ljava/lang/String;Ljava/lang/String;)I
然后再用logcat就能看到日志了。兴冲冲改好代码，打包，用signapk.jar签名，但进行安装时总是说Data exceeds UNCOMPRESS_DATA_MAX，会有一些资源找不到导致程序蹦掉。。google了很多解决方法都没成功。。
后来灵机一动，只把原来微信.apk里的classes.dex替换成修改过的版本，重新签名，it works，在log里看到密钥了！
一阵激动，于是把数据库拿到pc上，用本地编译的sqlcipher想直接读出来。。。但总还是失败。。难道腾讯还修改过加密算法…… 没有办法，想直接调用libmmcrypto.so。。结果发现我的工具链里的glibc和android系统里的版本不兼容，最终也没能实现交叉调用(这大概也是最初自己编译的sqlcipher不能被微信使用的原因)……
后来想起android貌似还有个ndk，于是糙快猛入门，编译了个executable出来，总算work了。。 运行过程中发现mmcrypto打出了些debug信息，估计真是被腾讯改过了；而且版本好老，木有sqlcipher_export ，还得自己手动写程序dump……
微信做了数据库加密，而且密钥跟机器相关（甚至可能还跟系统相关），一旦机器蹦了或丢了数据就没了，但不提供导出记录，呵呵……
附：dump数据库用的小程序(从sqlite3 里抠了不少代码……)
- #include <string.h>
- #include <stdlib.h>
- #include <dlfcn.h>
- #include <stdio.h>
- #include <sqlite3.h>
- #include <assert.h>
- #define DECLARE(name) \
- static typeof(name) *f_##name;
- DECLARE(sqlite3_close)
- DECLARE(sqlite3_column_text)
- DECLARE(sqlite3_column_count)
- DECLARE(sqlite3_errmsg)
- DECLARE(sqlite3_exec)
- DECLARE(sqlite3_finalize)
- DECLARE(sqlite3_free)
- DECLARE(sqlite3_initialize)
- DECLARE(sqlite3_mprintf)
- DECLARE(sqlite3_open_v2)
- DECLARE(sqlite3_prepare)
- DECLARE(sqlite3_shutdown)
- DECLARE(sqlite3_snprintf)
- DECLARE(sqlite3_step)
- DECLARE(sqlite3_trace)
- #define UNUSED_PARAMETER(name) (void)(name)
- static int callback(void *NotUsed, int argc, char **argv, char **azColName){
- UNUSED_PARAMETER(NotUsed);
- int i;
- for(i=0; i<argc; i++){
- printf("%s = %s\n", azColName[i], argv[i] ? argv[i] : "NULL");
- }
- printf("\n");
- return 0;
- }
- /*
- ** An pointer to an instance of this structure is passed from
- ** the main program to the callback. This is used to communicate
- ** state and mode information.
- */
- struct callback_data {
- sqlite3 *db; /* The database */
- int echoOn; /* True to echo input commands */
- int statsOn; /* True to display memory stats before each finalize */
- int cnt; /* Number of records displayed so far */
- FILE *out; /* Write results here */
- FILE *traceOut; /* Output for f_sqlite3_trace() */
- int nErr; /* Number of errors seen */
- int mode; /* An output mode setting */
- int writableSchema; /* True if PRAGMA writable_schema=ON */
- int showHeader; /* True to show column names in List or Column mode */
- char *zDestTable; /* Name of destination table when MODE_Insert */
- char separator[20]; /* Separator character for MODE_List */
- int colWidth[100]; /* Requested width of each column when in column mode*/
- int actualWidth[100]; /* Actual width of each column */
- char nullvalue[20]; /* The text to print when a NULL comes back from
- ** the database */
- const char *zDbFilename; /* name of the database file */
- const char *zVfs; /* Name of VFS to use */
- sqlite3_stmt *pStmt; /* Current statement if any. */
- FILE *pLog; /* Write log output here */
- };
- /*
- ** Execute a query statement that will generate SQL output. Print
- ** the result columns, comma-separated, on a line and then add a
- ** semicolon terminator to the end of that line.
- **
- ** If the number of columns is 1 and that column contains text "--"
- ** then write the semicolon on a separate line. That way, if a
- ** "--" comment occurs at the end of the statement, the comment
- ** won't consume the semicolon terminator.
- */
- static int run_table_dump_query(
- struct callback_data *p, /* Query context */
- const char *zSelect, /* SELECT statement to extract content */
- const char *zFirstRow /* Print before first row, if not NULL */
- ){
- sqlite3_stmt *pSelect;
- int rc;
- int nResult;
- int i;
- const char *z;
- rc = f_sqlite3_prepare(p->db, zSelect, -1, &pSelect, 0);
- if( rc!=SQLITE_OK || !pSelect ){
- fprintf(p->out, "/**** ERROR: (%d) %s *****/\n", rc, f_sqlite3_errmsg(p->db));
- p->nErr++;
- return rc;
- }
- rc = f_sqlite3_step(pSelect);
- nResult = f_sqlite3_column_count(pSelect);
- while( rc==SQLITE_ROW ){
- if( zFirstRow ){
- fprintf(p->out, "%s", zFirstRow);
- zFirstRow = 0;
- }
- z = (const char*)f_sqlite3_column_text(pSelect, 0);
- fprintf(p->out, "%s", z);
- for(i=1; i<nResult; i++){
- fprintf(p->out, ",%s", f_sqlite3_column_text(pSelect, i));
- }
- if( z==0 ) z = "";
- while( z[0] && (z[0]!='-' || z[1]!='-') ) z++;
- if( z[0] ){
- fprintf(p->out, "\n;\n");
- }else{
- fprintf(p->out, ";\n");
- }
- rc = f_sqlite3_step(pSelect);
- }
- rc = f_sqlite3_finalize(pSelect);
- if( rc!=SQLITE_OK ){
- fprintf(p->out, "/**** ERROR: (%d) %s *****/\n", rc, f_sqlite3_errmsg(p->db));
- p->nErr++;
- }
- return rc;
- }
- /*
- ** Compute a string length that is limited to what can be stored in
- ** lower 30 bits of a 32-bit signed integer.
- */
- static int strlen30(const char *z){
- const char *z2 = z;
- while( *z2 ){ z2++; }
- return 0x3fffffff & (int)(z2 - z);
- }
- /* zIn is either a pointer to a NULL-terminated string in memory obtained
- ** from malloc(), or a NULL pointer. The string pointed to by zAppend is
- ** added to zIn, and the result returned in memory obtained from malloc().
- ** zIn, if it was not NULL, is freed.
- **
- ** If the third argument, quote, is not '\0', then it is used as a
- ** quote character for zAppend.
- */
- static char *appendText(char *zIn, char const *zAppend, char quote){
- int len;
- int i;
- int nAppend = strlen30(zAppend);
- int nIn = (zIn?strlen30(zIn):0);
- len = nAppend+nIn+1;
- if( quote ){
- len += 2;
- for(i=0; i<nAppend; i++){
- if( zAppend[i]==quote ) len++;
- }
- }
- zIn = (char *)realloc(zIn, len);
- if( !zIn ){
- return 0;
- }
- if( quote ){
- char *zCsr = &zIn[nIn];
- *zCsr++ = quote;
- for(i=0; i<nAppend; i++){
- *zCsr++ = zAppend[i];
- if( zAppend[i]==quote ) *zCsr++ = quote;
- }
- *zCsr++ = quote;
- *zCsr++ = '\0';
- assert( (zCsr-zIn)==len );
- }else{
- memcpy(&zIn[nIn], zAppend, nAppend);
- zIn[len-1] = '\0';
- }
- return zIn;
- }
- /*
- ** This is a different callback routine used for dumping the database.
- ** Each row received by this callback consists of a table name,
- ** the table type ("index" or "table") and SQL to create the table.
- ** This routine should print text sufficient to recreate the table.
- */
- static int dump_callback(void *pArg, int nArg, char **azArg, char **azCol){
- int rc;
- const char *zTable;
- const char *zType;
- const char *zSql;
- const char *zPrepStmt = 0;
- struct callback_data *p = (struct callback_data *)pArg;
- UNUSED_PARAMETER(azCol);
- if( nArg!=3 ) return 1;
- zTable = azArg[0];
- zType = azArg[1];
- zSql = azArg[2];
-
- if( strcmp(zTable, "sqlite_sequence")==0 ){
- zPrepStmt = "DELETE FROM sqlite_sequence;\n";
- }else if( strcmp(zTable, "sqlite_stat1")==0 ){
- fprintf(p->out, "ANALYZE sqlite_master;\n");
- }else if( strncmp(zTable, "sqlite_", 7)==0 ){
- return 0;
- }else if( strncmp(zSql, "CREATE VIRTUAL TABLE", 20)==0 ){
- char *zIns;
- if( !p->writableSchema ){
- fprintf(p->out, "PRAGMA writable_schema=ON;\n");
- p->writableSchema = 1;
- }
- zIns = f_sqlite3_mprintf(
- "INSERT INTO sqlite_master(type,name,tbl_name,rootpage,sql)"
- "VALUES('table','%q','%q',0,'%q');",
- zTable, zTable, zSql);
- fprintf(p->out, "%s\n", zIns);
- f_sqlite3_free(zIns);
- return 0;
- }else{
- fprintf(p->out, "%s;\n", zSql);
- }
- if( strcmp(zType, "table")==0 ){
- sqlite3_stmt *pTableInfo = 0;
- char *zSelect = 0;
- char *zTableInfo = 0;
- char *zTmp = 0;
- int nRow = 0;
-
- zTableInfo = appendText(zTableInfo, "PRAGMA table_info(", 0);
- zTableInfo = appendText(zTableInfo, zTable, '"');
- zTableInfo = appendText(zTableInfo, ");", 0);
- rc = f_sqlite3_prepare(p->db, zTableInfo, -1, &pTableInfo, 0);
- free(zTableInfo);
- if( rc!=SQLITE_OK || !pTableInfo ){
- return 1;
- }
- zSelect = appendText(zSelect, "SELECT 'INSERT INTO ' || ", 0);
- /* Always quote the table name, even if it appears to be pure ascii,
- ** in case it is a keyword. Ex: INSERT INTO "table" ... */
- zTmp = appendText(zTmp, zTable, '"');
- if( zTmp ){
- zSelect = appendText(zSelect, zTmp, '\'');
- free(zTmp);
- }
- zSelect = appendText(zSelect, " || ' VALUES(' || ", 0);
- rc = f_sqlite3_step(pTableInfo);
- while( rc==SQLITE_ROW ){
- const char *zText = (const char *)f_sqlite3_column_text(pTableInfo, 1);
- zSelect = appendText(zSelect, "quote(", 0);
- zSelect = appendText(zSelect, zText, '"');
- rc = f_sqlite3_step(pTableInfo);
- if( rc==SQLITE_ROW ){
- zSelect = appendText(zSelect, "), ", 0);
- }else{
- zSelect = appendText(zSelect, ") ", 0);
- }
- nRow++;
- }
- rc = f_sqlite3_finalize(pTableInfo);
- if( rc!=SQLITE_OK || nRow==0 ){
- free(zSelect);
- return 1;
- }
- zSelect = appendText(zSelect, "|| ')' FROM ", 0);
- zSelect = appendText(zSelect, zTable, '"');
- rc = run_table_dump_query(p, zSelect, zPrepStmt);
- if( rc==SQLITE_CORRUPT ){
- zSelect = appendText(zSelect, " ORDER BY rowid DESC", 0);
- run_table_dump_query(p, zSelect, 0);
- }
- free(zSelect);
- }
- return 0;
- }
- /*
- ** Run zQuery. Use dump_callback() as the callback routine so that
- ** the contents of the query are output as SQL statements.
- **
- ** If we get a SQLITE_CORRUPT error, rerun the query after appending
- ** "ORDER BY rowid DESC" to the end.
- */
- static int run_schema_dump_query(
- struct callback_data *p,
- const char *zQuery
- ){
- int rc;
- char *zErr = 0;
- rc = f_sqlite3_exec(p->db, zQuery, dump_callback, p, &zErr);
- if( rc==SQLITE_CORRUPT ){
- char *zQ2;
- int len = strlen30(zQuery);
- fprintf(p->out, "/****** CORRUPTION ERROR *******/\n");
- if( zErr ){
- fprintf(p->out, "/****** %s ******/\n", zErr);
- f_sqlite3_free(zErr);
- zErr = 0;
- }
- zQ2 = malloc( len+100 );
- if( zQ2==0 ) return rc;
- f_sqlite3_snprintf(len+100, zQ2, "%s ORDER BY rowid DESC", zQuery);
- rc = f_sqlite3_exec(p->db, zQ2, dump_callback, p, &zErr);
- if( rc ){
- fprintf(p->out, "/****** ERROR: %s ******/\n", zErr);
- }else{
- rc = SQLITE_CORRUPT;
- }
- f_sqlite3_free(zErr);
- free(zQ2);
- }
- return rc;
- }
- static void dump(struct callback_data *p)
- {
- /* When playing back a "dump", the content might appear in an order
- ** which causes immediate foreign key constraints to be violated.
- ** So disable foreign-key constraint enforcement to prevent problems. */
- fprintf(p->out, "PRAGMA foreign_keys=OFF;\n");
- fprintf(p->out, "BEGIN TRANSACTION;\n");
- p->writableSchema = 0;
- f_sqlite3_exec(p->db, "SAVEPOINT dump; PRAGMA writable_schema=ON", 0, 0, 0);
- p->nErr = 0;
- run_schema_dump_query(p,
- "SELECT name, type, sql FROM sqlite_master "
- "WHERE sql NOT NULL AND type=='table' AND name!='sqlite_sequence'"
- );
- run_schema_dump_query(p,
- "SELECT name, type, sql FROM sqlite_master "
- "WHERE name=='sqlite_sequence'"
- );
- run_table_dump_query(p,
- "SELECT sql FROM sqlite_master "
- "WHERE sql NOT NULL AND type IN ('index','trigger','view')", 0
- );
- if( p->writableSchema ){
- fprintf(p->out, "PRAGMA writable_schema=OFF;\n");
- p->writableSchema = 0;
- }
- f_sqlite3_exec(p->db, "PRAGMA writable_schema=OFF;", 0, 0, 0);
- f_sqlite3_exec(p->db, "RELEASE dump;", 0, 0, 0);
- fprintf(p->out, p->nErr ? "ROLLBACK; -- due to errors\n" : "COMMIT;\n");
- }
- int main(int argc, char **argv){
- sqlite3 *db;
- char *zErrMsg = 0;
- int rc, i;
- if( argc < 4 ){
- fprintf(stderr, "Usage: %s library DATABASE SQL-STATEMENTs\n", argv[0]);
- return 1;
- }
-
- void *hdl = dlopen(argv[1], RTLD_LAZY);
- if (!hdl) {
- fprintf(stderr, "failed to load lib: %s\n", dlerror());
- return -1;
- }
- #define SOLVE(name) \
- f_##name = dlsym(hdl, # name); \
- if (!f_##name) { \
- fprintf(stderr, "failed to resolve %s: %s\n", #name, dlerror()); \
- return -1; \
- }
- SOLVE(sqlite3_close);
- SOLVE(sqlite3_column_text);
- SOLVE(sqlite3_column_count);
- SOLVE(sqlite3_errmsg);
- SOLVE(sqlite3_exec);
- SOLVE(sqlite3_finalize);
- SOLVE(sqlite3_free);
- SOLVE(sqlite3_initialize);
- SOLVE(sqlite3_mprintf);
- SOLVE(sqlite3_open_v2);
- SOLVE(sqlite3_prepare);
- SOLVE(sqlite3_shutdown);
- SOLVE(sqlite3_snprintf);
- SOLVE(sqlite3_step);
- SOLVE(sqlite3_trace);
- f_sqlite3_initialize();
- rc = f_sqlite3_open_v2(argv[2], &db,
- SQLITE_OPEN_READWRITE | SQLITE_OPEN_CREATE, NULL);
- if( rc ){
- fprintf(stderr, "Can't open database: %s\n", f_sqlite3_errmsg(db));
- f_sqlite3_close(db);
- return 1;
- }
- for (i = 3; i < argc; i ++)
- {
- fprintf(stderr, "exec: %s\n", argv[i]);
- if (!strncmp(argv[i], ".dump", 5)) {
- struct callback_data p;
- memset(&p, 0, sizeof(p));
- p.out = fopen(argv[i] + 5, "w");
- if (!p.out) {
- fprintf(stderr, "failed to open file %s: %m\n", argv[i] + 5);
- break;
- }
- p.db = db;
- dump(&p);
- fclose(p.out);
- continue;
- }
- rc = f_sqlite3_exec(db, argv[i], callback, 0, &zErrMsg);
- if( rc!=SQLITE_OK ) {
- fprintf(stderr, "SQL error: %s\n", zErrMsg);
- f_sqlite3_free(zErrMsg);
- break;
- }
- }
- f_sqlite3_close(db);
- f_sqlite3_shutdown();
- return 0;
- }
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