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    演示从注册表中还原MSNMessenger口令:注册表命令

    时间：2020-02-19来源：山茶花美文网 本文已影响 人 山茶花美文网手机站

    /* MSNMessenger的口令是经过DPAPI加密后保存在注册表中的

    * 这个程序演示解码过程

    * tombkeeper[0x40]nsfocus[0x2e]com

    * tombkeeper[0x40]xfocus[0x2e]net

    * 2004.08.11

    */ #include <Windows.h> #pragma comment(lib, "Advapi32.lib")

    #define FCHK(a) if (!(a)) {printf(#a " failedn"); return 0;}

    typedef struct _CRYPTOAPI_BLOB {

    DWORD cbData;

    BYTE* pbData;

    } DATA_BLOB;

    typedef struct _CRYPTPROTECT_PROMPTSTRUCT {

    DWORD cbSize;

    DWORD dwPromptFlags;

    HWND hwndApp;

    LPCWSTR szPrompt;

    } CRYPTPROTECT_PROMPTSTRUCT, *PCRYPTPROTECT_PROMPTSTRUCT;

    typedef BOOL (WINAPI *PCryptUnprotectData)(

    DATA_BLOB* pDataIn,

    LPWSTR* ppszDataDescr,

    DATA_BLOB* pOptionalEntropy,

    PVOID pvReserved,

    CRYPTPROTECT_PROMPTSTRUCT* pPromptStruct,

    DWORD dwFlags,

    DATA_BLOB* pDataOut

    );

    PCryptUnprotectData CryptUnprotectData = NULL; int main(void)

    {

    int ret;

    HMODULE hNtdll;

    HKEY hKey;

    DWORD dwType;

    char Data[0x100] = {0};

    DWORD dwSize;

    DATA_BLOB DataIn;

    DATA_BLOB DataOut;

    ret = RegOpenKeyEx

    (

    HKEY_CURRENT_USER,

    "SoftwareMicrosoftMSNMessenger",

    0,

    KEY_READ,

    &hKey

    );

    if( ret != ERROR_SUCCESS ) return 1;

    ret = RegQueryValueEx

    (

    hKey,

    "Password.NET Messenger Service",

    NULL,

    &dwType,

    Data,

    &dwSize

    );

    if( ret != ERROR_SUCCESS ) return 1;

    FCHK ((hNtdll = LoadLibrary ("Crypt32.dll")) != NULL);

    FCHK ((CryptUnprotectData = (PCryptUnprotectData)

    GetProcAddress (hNtdll, "CryptUnprotectData")) != NULL);

    DataIn.pbData = Data 2; //口令密文从第二位开始

    DataIn.cbData = dwSize-2;

    CryptUnprotectData

    (

    &DataIn,

    NULL,

    NULL,

    NULL,

    NULL,

    1,

    &DataOut

    );

    base64_decode (DataOut.pbData, Data, strlen(DataOut.pbData));

    printf ( "MSN Password: %sn", Data);

    return 0;

    }

    //copied from GNU libc - libc/resolv/base64.c

    int base64_decode (char const *src, char *target, size_t targsize)

    {

    static const char Base64[] =

    "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789 /";

    static const char Pad64 = ’=’;

    int tarindex, state, ch;

    char *pos;

    state = 0;

    tarindex = 0;

    while ((ch = *src ) != ’’)

    {

    if (isspace (ch)) /* Skip whitespace anywhere. */

    continue;

    if (ch == Pad64)

    break;

    pos = strchr (Base64, ch);

    if (pos == 0) /* A non-base64 character. */

    return (-1);

    switch (state)

    {

    case 0:

    if (target)

    {

    if ((size_t) tarindex >= targsize)

    return (-1);

    target[tarindex] = (pos - Base64) << 2;

    }

    state = 1;

    break;

    case 1:

    if (target)

    {

    if ((size_t) tarindex 1 >= targsize)

    return (-1);

    target[tarindex] |= (pos - Base64) >> 4;

    target[tarindex 1] = ((pos - Base64) & 0x0f) << 4;

    }

    tarindex ;

    state = 2;

    break;

    case 2:

    if (target)

    {

    if ((size_t) tarindex 1 >= targsize)

    return (-1);

    target[tarindex] |= (pos - Base64) >> 2;

    target[tarindex 1] = ((pos - Base64) & 0x03) << 6;

    }

    tarindex ;

    state = 3;

    break;

    case 3:

    if (target)

    {

    if ((size_t) tarindex >= targsize)

    return (-1);

    target[tarindex] |= (pos - Base64);

    }

    tarindex ;

    state = 0;

    break;

    default:

    abort ();

    }

    }

    /*

    * We are done decoding Base-64 chars. Let’s see if we ended

    * on a byte boundary, and/or with erroneous trailing characters.

    */

    if (ch == Pad64)

    { /* We got a pad char. */

    ch = *src ; /* Skip it, get next. */

    switch (state)

    {

    case 0: /* Invalid = in first position */

    case 1: /* Invalid = in second position */

    return (-1);

    case 2: /* Valid, means one byte of info */

    /* Skip any number of spaces. */

    for ((void) NULL; ch != ’’; ch = *src )

    if (!isspace (ch))

    break;

    /* Make sure there is another trailing = sign. */

    if (ch != Pad64)

    return (-1);

    ch = *src ; /* Skip the = */

    /* Fall through to "single trailing =" case. */

    /* FALLTHROUGH */

    case 3: /* Valid, means two bytes of info */

    /*

    * We know this char is an =. Is there anything but

    * whitespace after it?

    */

    for ((void) NULL; ch != ’’; ch = *src )

    if (!isspace (ch))

    return (-1);

    /*

    * Now make sure for cases 2 and 3 that the "extra"

    * bits that slopped past the last full byte were

    * zeros. If we don’t check them, they become a

    * subliminal channel.

    */

    if (target && target[tarindex] != 0)

    return (-1);

    }

    }

    else

    {

    /*

    * We ended by seeing the end of the string. Make sure we

    * have no partial bytes lying around.

    */

    if (state != 0)

    return (-1);

    }

    return (tarindex);

    }

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    本文演示从注册表中还原MSNMessenger口令:注册表命令由山茶花美文网整理提供，版权归原作者、原出处所有。

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