MD5 service provider module (not tested yet)

git-svn-id: http://svn.inspircd.org/repository/trunk/inspircd@5848 e03df62e-2008-0410-955e-edbf42e46eb7

1 files changed, 343 insertions, 0 deletions

diff --git a/src/modules/m_md5.cpp b/src/modules/m_md5.cpp
new file mode 100644
index 000000000..419d66e28
--- /dev/null
+++ b/src/modules/m_md5.cpp
@@ -0,0 +1,343 @@
+/*       +------------------------------------+
+ *       | Inspire Internet Relay Chat Daemon |
+ *       +------------------------------------+
+ *
+ *  InspIRCd is copyright (C) 2002-2006 ChatSpike-Dev.
+ *                       E-mail:
+ *                <brain@chatspike.net>
+ *           	  <Craig@chatspike.net>
+ *     
+ * Written by Craig Edwards, Craig McLure, and others.
+ * This program is free but copyrighted software; see
+ *            the file COPYING for details.
+ *
+ * ---------------------------------------------------
+ */
+
+/* $ModDesc: Allows for MD5 encrypted oper passwords */
+
+using namespace std;
+
+#include "inspircd_config.h"
+#ifdef HAS_STDINT
+#include <stdint.h>
+#endif
+#include "users.h"
+#include "channels.h"
+#include "modules.h"
+
+#include "inspircd.h"
+
+/* The four core functions - F1 is optimized somewhat */
+#define F1(x, y, z) (z ^ (x & (y ^ z)))
+#define F2(x, y, z) F1(z, x, y)
+#define F3(x, y, z) (x ^ y ^ z)
+#define F4(x, y, z) (y ^ (x | ~z))
+
+/* This is the central step in the MD5 algorithm. */
+#define MD5STEP(f,w,x,y,z,in,s) \
+         (w += f(x,y,z) + in, w = (w<<s | w>>(32-s)) + x)
+
+#ifndef HAS_STDINT
+typedef unsigned int uint32_t;
+#endif
+
+typedef uint32_t word32; /* NOT unsigned long. We don't support 16 bit platforms, anyway. */
+typedef unsigned char byte;
+
+/** An MD5 context, used by m_opermd5
+ */
+class MD5Context : public classbase
+{
+ public:
+	word32 buf[4];
+	word32 bytes[2];
+	word32 in[16];
+};
+
+class ModuleMD5 : public Module
+{
+	void byteSwap(word32 *buf, unsigned words)
+	{
+		byte *p = (byte *)buf;
+	
+		do
+		{
+			*buf++ = (word32)((unsigned)p[3] << 8 | p[2]) << 16 |
+				((unsigned)p[1] << 8 | p[0]);
+			p += 4;
+		} while (--words);
+	}
+	
+	/* XXX - maybe if we had an md5/encryption moduletype? *shrug* */
+	void MD5Init(struct MD5Context *ctx, unsigned int* key = NULL)
+	{
+		/* These are the defaults for md5 */
+		if (!key)
+		{
+			ctx->buf[0] = 0x67452301;
+			ctx->buf[1] = 0xefcdab89;
+			ctx->buf[2] = 0x98badcfe;
+			ctx->buf[3] = 0x10325476;
+		}
+		else
+		{
+			ctx->buf[0] = key[0];
+			ctx->buf[1] = key[1];
+			ctx->buf[2] = key[2];
+			ctx->buf[3] = key[3];
+		}
+	
+		ctx->bytes[0] = 0;
+		ctx->bytes[1] = 0;
+	}
+
+	void MD5Update(struct MD5Context *ctx, byte const *buf, int len)
+	{
+		word32 t;
+	
+		/* Update byte count */
+	
+		t = ctx->bytes[0];
+		if ((ctx->bytes[0] = t + len) < t)
+			ctx->bytes[1]++;	/* Carry from low to high */
+	
+		t = 64 - (t & 0x3f);	/* Space available in ctx->in (at least 1) */
+		if ((unsigned)t > (unsigned)len)
+		{
+			memcpy((byte *)ctx->in + 64 - (unsigned)t, buf, len);
+			return;
+		}
+		/* First chunk is an odd size */
+		memcpy((byte *)ctx->in + 64 - (unsigned)t, buf, (unsigned)t);
+		byteSwap(ctx->in, 16);
+		MD5Transform(ctx->buf, ctx->in);
+		buf += (unsigned)t;
+		len -= (unsigned)t;
+	
+		/* Process data in 64-byte chunks */
+		while (len >= 64)
+		{
+			memcpy(ctx->in, buf, 64);
+			byteSwap(ctx->in, 16);
+			MD5Transform(ctx->buf, ctx->in);
+			buf += 64;
+			len -= 64;
+		}
+	
+		/* Handle any remaining bytes of data. */
+		memcpy(ctx->in, buf, len);
+	}
+	
+	void MD5Final(byte digest[16], struct MD5Context *ctx)
+	{
+		int count = (int)(ctx->bytes[0] & 0x3f); /* Bytes in ctx->in */
+		byte *p = (byte *)ctx->in + count;	/* First unused byte */
+	
+		/* Set the first char of padding to 0x80.  There is always room. */
+		*p++ = 0x80;
+	
+		/* Bytes of padding needed to make 56 bytes (-8..55) */
+		count = 56 - 1 - count;
+	
+		if (count < 0)
+		{	/* Padding forces an extra block */
+			memset(p, 0, count+8);
+			byteSwap(ctx->in, 16);
+			MD5Transform(ctx->buf, ctx->in);
+			p = (byte *)ctx->in;
+			count = 56;
+		}
+		memset(p, 0, count+8);
+		byteSwap(ctx->in, 14);
+	
+		/* Append length in bits and transform */
+		ctx->in[14] = ctx->bytes[0] << 3;
+		ctx->in[15] = ctx->bytes[1] << 3 | ctx->bytes[0] >> 29;
+		MD5Transform(ctx->buf, ctx->in);
+	
+		byteSwap(ctx->buf, 4);
+		memcpy(digest, ctx->buf, 16);
+		memset(ctx, 0, sizeof(ctx));
+	}
+	
+	void MD5Transform(word32 buf[4], word32 const in[16])
+	{
+		register word32 a, b, c, d;
+	
+		a = buf[0];
+		b = buf[1];
+		c = buf[2];
+		d = buf[3];
+	
+		MD5STEP(F1, a, b, c, d, in[0] + 0xd76aa478, 7);
+		MD5STEP(F1, d, a, b, c, in[1] + 0xe8c7b756, 12);
+		MD5STEP(F1, c, d, a, b, in[2] + 0x242070db, 17);
+		MD5STEP(F1, b, c, d, a, in[3] + 0xc1bdceee, 22);
+		MD5STEP(F1, a, b, c, d, in[4] + 0xf57c0faf, 7);
+		MD5STEP(F1, d, a, b, c, in[5] + 0x4787c62a, 12);
+		MD5STEP(F1, c, d, a, b, in[6] + 0xa8304613, 17);
+		MD5STEP(F1, b, c, d, a, in[7] + 0xfd469501, 22);
+		MD5STEP(F1, a, b, c, d, in[8] + 0x698098d8, 7);
+		MD5STEP(F1, d, a, b, c, in[9] + 0x8b44f7af, 12);
+		MD5STEP(F1, c, d, a, b, in[10] + 0xffff5bb1, 17);
+		MD5STEP(F1, b, c, d, a, in[11] + 0x895cd7be, 22);
+		MD5STEP(F1, a, b, c, d, in[12] + 0x6b901122, 7);
+		MD5STEP(F1, d, a, b, c, in[13] + 0xfd987193, 12);
+		MD5STEP(F1, c, d, a, b, in[14] + 0xa679438e, 17);
+		MD5STEP(F1, b, c, d, a, in[15] + 0x49b40821, 22);
+	
+		MD5STEP(F2, a, b, c, d, in[1] + 0xf61e2562, 5);
+		MD5STEP(F2, d, a, b, c, in[6] + 0xc040b340, 9);
+		MD5STEP(F2, c, d, a, b, in[11] + 0x265e5a51, 14);
+		MD5STEP(F2, b, c, d, a, in[0] + 0xe9b6c7aa, 20);
+		MD5STEP(F2, a, b, c, d, in[5] + 0xd62f105d, 5);
+		MD5STEP(F2, d, a, b, c, in[10] + 0x02441453, 9);
+		MD5STEP(F2, c, d, a, b, in[15] + 0xd8a1e681, 14);
+		MD5STEP(F2, b, c, d, a, in[4] + 0xe7d3fbc8, 20);
+		MD5STEP(F2, a, b, c, d, in[9] + 0x21e1cde6, 5);
+		MD5STEP(F2, d, a, b, c, in[14] + 0xc33707d6, 9);
+		MD5STEP(F2, c, d, a, b, in[3] + 0xf4d50d87, 14);
+		MD5STEP(F2, b, c, d, a, in[8] + 0x455a14ed, 20);
+		MD5STEP(F2, a, b, c, d, in[13] + 0xa9e3e905, 5);
+		MD5STEP(F2, d, a, b, c, in[2] + 0xfcefa3f8, 9);
+		MD5STEP(F2, c, d, a, b, in[7] + 0x676f02d9, 14);
+		MD5STEP(F2, b, c, d, a, in[12] + 0x8d2a4c8a, 20);
+	
+		MD5STEP(F3, a, b, c, d, in[5] + 0xfffa3942, 4);
+		MD5STEP(F3, d, a, b, c, in[8] + 0x8771f681, 11);
+		MD5STEP(F3, c, d, a, b, in[11] + 0x6d9d6122, 16);
+		MD5STEP(F3, b, c, d, a, in[14] + 0xfde5380c, 23);
+		MD5STEP(F3, a, b, c, d, in[1] + 0xa4beea44, 4);
+		MD5STEP(F3, d, a, b, c, in[4] + 0x4bdecfa9, 11);
+		MD5STEP(F3, c, d, a, b, in[7] + 0xf6bb4b60, 16);
+		MD5STEP(F3, b, c, d, a, in[10] + 0xbebfbc70, 23);
+		MD5STEP(F3, a, b, c, d, in[13] + 0x289b7ec6, 4);
+		MD5STEP(F3, d, a, b, c, in[0] + 0xeaa127fa, 11);
+		MD5STEP(F3, c, d, a, b, in[3] + 0xd4ef3085, 16);
+		MD5STEP(F3, b, c, d, a, in[6] + 0x04881d05, 23);
+		MD5STEP(F3, a, b, c, d, in[9] + 0xd9d4d039, 4);
+		MD5STEP(F3, d, a, b, c, in[12] + 0xe6db99e5, 11);
+		MD5STEP(F3, c, d, a, b, in[15] + 0x1fa27cf8, 16);
+		MD5STEP(F3, b, c, d, a, in[2] + 0xc4ac5665, 23);
+	
+		MD5STEP(F4, a, b, c, d, in[0] + 0xf4292244, 6);
+		MD5STEP(F4, d, a, b, c, in[7] + 0x432aff97, 10);
+		MD5STEP(F4, c, d, a, b, in[14] + 0xab9423a7, 15);
+		MD5STEP(F4, b, c, d, a, in[5] + 0xfc93a039, 21);
+		MD5STEP(F4, a, b, c, d, in[12] + 0x655b59c3, 6);
+		MD5STEP(F4, d, a, b, c, in[3] + 0x8f0ccc92, 10);
+		MD5STEP(F4, c, d, a, b, in[10] + 0xffeff47d, 15);
+		MD5STEP(F4, b, c, d, a, in[1] + 0x85845dd1, 21);
+		MD5STEP(F4, a, b, c, d, in[8] + 0x6fa87e4f, 6);
+		MD5STEP(F4, d, a, b, c, in[15] + 0xfe2ce6e0, 10);
+		MD5STEP(F4, c, d, a, b, in[6] + 0xa3014314, 15);
+		MD5STEP(F4, b, c, d, a, in[13] + 0x4e0811a1, 21);
+		MD5STEP(F4, a, b, c, d, in[4] + 0xf7537e82, 6);
+		MD5STEP(F4, d, a, b, c, in[11] + 0xbd3af235, 10);
+		MD5STEP(F4, c, d, a, b, in[2] + 0x2ad7d2bb, 15);
+		MD5STEP(F4, b, c, d, a, in[9] + 0xeb86d391, 21);
+	
+		buf[0] += a;
+		buf[1] += b;
+		buf[2] += c;
+		buf[3] += d;
+	}
+	
+	
+	void MyMD5(void *dest, void *orig, int len, unsigned int* key)
+	{
+		MD5Context context;
+		MD5Init(&context, key);
+		MD5Update(&context, (const unsigned char*)orig, len);
+		MD5Final((unsigned char*)dest, &context);
+	}
+	
+	
+	void GenHash(const char* src, char* dest, const char* xtab, unsigned int* key)
+	{
+		unsigned char bytes[16];
+
+		MyMD5((char*)bytes, (void*)src, strlen(src), key);
+
+		for (int i = 0; i < 16; i++)
+		{
+			*dest++ = xtab[bytes[i] / 16];
+			*dest++ = xtab[bytes[i] % 16];
+		}
+		*dest++ = 0;
+	}
+
+	unsigned int *key;
+	char* chars;
+
+ public:
+
+	ModuleMD5(InspIRCd* Me)
+		: Module::Module(Me), key(NULL), chars(NULL)
+	{
+	}
+	
+	virtual ~ModuleMD5()
+	{
+	}
+
+	void Implements(char* List)
+	{
+		List[I_OnRequest] = 1;
+	}
+	
+	virtual char* OnRequest(Request* request)
+	{
+		if (strcmp("MD5_SETKEY", request->GetId()) == 0)
+		{
+			this->key = (unsigned int*)request->GetData();
+		}
+		else if (strcmp("MD5_SETCHARS", request->GetId()) == 0)
+		{
+			this->chars = (char*)request->GetData();
+		}
+		else if (strcmp("MD5_SUM", request->GetId()) == 0)
+		{
+			static char data[MAXBUF];
+			GenHash((const char*)request->GetData(), data, chars ? chars : "0123456789abcdef", key);
+			return data;
+		}
+		else if (strcmp("MD5_RESET", request->GetId()) == 0)
+		{
+			this->chars = NULL;
+			this->key = NULL;
+		}
+		return NULL;
+	}
+
+	virtual Version GetVersion()
+	{
+		return Version(1,1,0,1,VF_VENDOR,API_VERSION);
+	}
+};
+
+
+class ModuleMD5Factory : public ModuleFactory
+{
+ public:
+	ModuleMD5Factory()
+	{
+	}
+	
+	~ModuleMD5Factory()
+	{
+	}
+	
+	virtual Module * CreateModule(InspIRCd* Me)
+	{
+		return new ModuleMD5(Me);
+	}
+	
+};
+
+
+extern "C" void * init_module( void )
+{
+	return new ModuleMD5Factory;
+}