diff --git a/src/backend/libpq/md5.c b/src/backend/libpq/md5.c new file mode 100644 index 0000000000..20392fb4e7 --- /dev/null +++ b/src/backend/libpq/md5.c @@ -0,0 +1,303 @@ +/* + * md5.c + * + * Implements the MD5 Message-Digest Algorithm as specified in + * RFC 1321. This implementation is a simple one, in that it + * needs every input byte to be buffered before doing any + * calculations. I do not expect this file to be used for + * general purpose MD5'ing of large amounts of data, only for + * generating hashed passwords from limited input. + * + * Sverre H. Huseby + */ + + +#include +#include +#include +#include + +#include "postgres.h" +#include "libpq/md5.h" + +/* + * PRIVATE FUNCTIONS + */ + +typedef unsigned char unsigned8; +typedef unsigned int unsigned32; +typedef unsigned long unsigned64; + +/* + * The returned array is allocated using malloc. the caller should free it + * when it is no longer needed. + */ +static unsigned8 * +createPaddedCopyWithLength(unsigned8 *b, unsigned32 *l) +{ + unsigned8 *ret; + unsigned32 q; + unsigned32 len, newLen448; + unsigned64 len64; + + len = ((b == NULL) ? 0 : *l); + newLen448 = len + 64 - (len % 64) - 8; + if (newLen448 <= len) + newLen448 += 64; + + *l = newLen448 + 8; + if ((ret = (unsigned8 *) malloc(sizeof(unsigned8) * *l)) == NULL) + return NULL; + + if (b != NULL) + memcpy(ret, b, sizeof(unsigned8) * len); + + /* pad */ + ret[len] = 0x80; + for (q = len + 1; q < newLen448; q++) + ret[q] = 0x00; + + /* append length as a 64 bit bitcount */ + len64 = len; + len64 <<= 3; + q = newLen448; + ret[q++] = (len64 & 0xFF); + len64 >>= 8; + ret[q++] = (len64 & 0xFF); + len64 >>= 8; + ret[q++] = (len64 & 0xFF); + len64 >>= 8; + ret[q++] = (len64 & 0xFF); + len64 >>= 8; + ret[q++] = (len64 & 0xFF); + len64 >>= 8; + ret[q++] = (len64 & 0xFF); + len64 >>= 8; + ret[q++] = (len64 & 0xFF); + len64 >>= 8; + ret[q] = (len64 & 0xFF); + + return ret; +} + +#define F(x, y, z) (((x) & (y)) | (~(x) & (z))) +#define G(x, y, z) (((x) & (z)) | ((y) & ~(z))) +#define H(x, y, z) ((x) ^ (y) ^ (z)) +#define I(x, y, z) ((y) ^ ((x) | ~(z))) +#define ROT_LEFT(x, n) (((x) << (n)) | ((x) >> (32 - (n)))) + +static void +doTheRounds(unsigned32 X[16], unsigned32 state[4]) +{ + unsigned32 a, b, c, d; + + a = state[0]; + b = state[1]; + c = state[2]; + d = state[3]; + + /* round 1 */ + a = b + ROT_LEFT((a + F(b, c, d) + X[ 0] + 0xd76aa478), 7); /* 1 */ + d = a + ROT_LEFT((d + F(a, b, c) + X[ 1] + 0xe8c7b756), 12); /* 2 */ + c = d + ROT_LEFT((c + F(d, a, b) + X[ 2] + 0x242070db), 17); /* 3 */ + b = c + ROT_LEFT((b + F(c, d, a) + X[ 3] + 0xc1bdceee), 22); /* 4 */ + a = b + ROT_LEFT((a + F(b, c, d) + X[ 4] + 0xf57c0faf), 7); /* 5 */ + d = a + ROT_LEFT((d + F(a, b, c) + X[ 5] + 0x4787c62a), 12); /* 6 */ + c = d + ROT_LEFT((c + F(d, a, b) + X[ 6] + 0xa8304613), 17); /* 7 */ + b = c + ROT_LEFT((b + F(c, d, a) + X[ 7] + 0xfd469501), 22); /* 8 */ + a = b + ROT_LEFT((a + F(b, c, d) + X[ 8] + 0x698098d8), 7); /* 9 */ + d = a + ROT_LEFT((d + F(a, b, c) + X[ 9] + 0x8b44f7af), 12); /* 10 */ + c = d + ROT_LEFT((c + F(d, a, b) + X[10] + 0xffff5bb1), 17); /* 11 */ + b = c + ROT_LEFT((b + F(c, d, a) + X[11] + 0x895cd7be), 22); /* 12 */ + a = b + ROT_LEFT((a + F(b, c, d) + X[12] + 0x6b901122), 7); /* 13 */ + d = a + ROT_LEFT((d + F(a, b, c) + X[13] + 0xfd987193), 12); /* 14 */ + c = d + ROT_LEFT((c + F(d, a, b) + X[14] + 0xa679438e), 17); /* 15 */ + b = c + ROT_LEFT((b + F(c, d, a) + X[15] + 0x49b40821), 22); /* 16 */ + + /* round 2 */ + a = b + ROT_LEFT((a + G(b, c, d) + X[ 1] + 0xf61e2562), 5); /* 17 */ + d = a + ROT_LEFT((d + G(a, b, c) + X[ 6] + 0xc040b340), 9); /* 18 */ + c = d + ROT_LEFT((c + G(d, a, b) + X[11] + 0x265e5a51), 14); /* 19 */ + b = c + ROT_LEFT((b + G(c, d, a) + X[ 0] + 0xe9b6c7aa), 20); /* 20 */ + a = b + ROT_LEFT((a + G(b, c, d) + X[ 5] + 0xd62f105d), 5); /* 21 */ + d = a + ROT_LEFT((d + G(a, b, c) + X[10] + 0x02441453), 9); /* 22 */ + c = d + ROT_LEFT((c + G(d, a, b) + X[15] + 0xd8a1e681), 14); /* 23 */ + b = c + ROT_LEFT((b + G(c, d, a) + X[ 4] + 0xe7d3fbc8), 20); /* 24 */ + a = b + ROT_LEFT((a + G(b, c, d) + X[ 9] + 0x21e1cde6), 5); /* 25 */ + d = a + ROT_LEFT((d + G(a, b, c) + X[14] + 0xc33707d6), 9); /* 26 */ + c = d + ROT_LEFT((c + G(d, a, b) + X[ 3] + 0xf4d50d87), 14); /* 27 */ + b = c + ROT_LEFT((b + G(c, d, a) + X[ 8] + 0x455a14ed), 20); /* 28 */ + a = b + ROT_LEFT((a + G(b, c, d) + X[13] + 0xa9e3e905), 5); /* 29 */ + d = a + ROT_LEFT((d + G(a, b, c) + X[ 2] + 0xfcefa3f8), 9); /* 30 */ + c = d + ROT_LEFT((c + G(d, a, b) + X[ 7] + 0x676f02d9), 14); /* 31 */ + b = c + ROT_LEFT((b + G(c, d, a) + X[12] + 0x8d2a4c8a), 20); /* 32 */ + + /* round 3 */ + a = b + ROT_LEFT((a + H(b, c, d) + X[ 5] + 0xfffa3942), 4); /* 33 */ + d = a + ROT_LEFT((d + H(a, b, c) + X[ 8] + 0x8771f681), 11); /* 34 */ + c = d + ROT_LEFT((c + H(d, a, b) + X[11] + 0x6d9d6122), 16); /* 35 */ + b = c + ROT_LEFT((b + H(c, d, a) + X[14] + 0xfde5380c), 23); /* 36 */ + a = b + ROT_LEFT((a + H(b, c, d) + X[ 1] + 0xa4beea44), 4); /* 37 */ + d = a + ROT_LEFT((d + H(a, b, c) + X[ 4] + 0x4bdecfa9), 11); /* 38 */ + c = d + ROT_LEFT((c + H(d, a, b) + X[ 7] + 0xf6bb4b60), 16); /* 39 */ + b = c + ROT_LEFT((b + H(c, d, a) + X[10] + 0xbebfbc70), 23); /* 40 */ + a = b + ROT_LEFT((a + H(b, c, d) + X[13] + 0x289b7ec6), 4); /* 41 */ + d = a + ROT_LEFT((d + H(a, b, c) + X[ 0] + 0xeaa127fa), 11); /* 42 */ + c = d + ROT_LEFT((c + H(d, a, b) + X[ 3] + 0xd4ef3085), 16); /* 43 */ + b = c + ROT_LEFT((b + H(c, d, a) + X[ 6] + 0x04881d05), 23); /* 44 */ + a = b + ROT_LEFT((a + H(b, c, d) + X[ 9] + 0xd9d4d039), 4); /* 45 */ + d = a + ROT_LEFT((d + H(a, b, c) + X[12] + 0xe6db99e5), 11); /* 46 */ + c = d + ROT_LEFT((c + H(d, a, b) + X[15] + 0x1fa27cf8), 16); /* 47 */ + b = c + ROT_LEFT((b + H(c, d, a) + X[ 2] + 0xc4ac5665), 23); /* 48 */ + + /* round 4 */ + a = b + ROT_LEFT((a + I(b, c, d) + X[ 0] + 0xf4292244), 6); /* 49 */ + d = a + ROT_LEFT((d + I(a, b, c) + X[ 7] + 0x432aff97), 10); /* 50 */ + c = d + ROT_LEFT((c + I(d, a, b) + X[14] + 0xab9423a7), 15); /* 51 */ + b = c + ROT_LEFT((b + I(c, d, a) + X[ 5] + 0xfc93a039), 21); /* 52 */ + a = b + ROT_LEFT((a + I(b, c, d) + X[12] + 0x655b59c3), 6); /* 53 */ + d = a + ROT_LEFT((d + I(a, b, c) + X[ 3] + 0x8f0ccc92), 10); /* 54 */ + c = d + ROT_LEFT((c + I(d, a, b) + X[10] + 0xffeff47d), 15); /* 55 */ + b = c + ROT_LEFT((b + I(c, d, a) + X[ 1] + 0x85845dd1), 21); /* 56 */ + a = b + ROT_LEFT((a + I(b, c, d) + X[ 8] + 0x6fa87e4f), 6); /* 57 */ + d = a + ROT_LEFT((d + I(a, b, c) + X[15] + 0xfe2ce6e0), 10); /* 58 */ + c = d + ROT_LEFT((c + I(d, a, b) + X[ 6] + 0xa3014314), 15); /* 59 */ + b = c + ROT_LEFT((b + I(c, d, a) + X[13] + 0x4e0811a1), 21); /* 60 */ + a = b + ROT_LEFT((a + I(b, c, d) + X[ 4] + 0xf7537e82), 6); /* 61 */ + d = a + ROT_LEFT((d + I(a, b, c) + X[11] + 0xbd3af235), 10); /* 62 */ + c = d + ROT_LEFT((c + I(d, a, b) + X[ 2] + 0x2ad7d2bb), 15); /* 63 */ + b = c + ROT_LEFT((b + I(c, d, a) + X[ 9] + 0xeb86d391), 21); /* 64 */ + + state[0] += a; + state[1] += b; + state[2] += c; + state[3] += d; +} + +static int +calculateDigestFromBuffer(unsigned8 *b, unsigned32 len, unsigned8 sum[16]) +{ + register unsigned32 i, j, k, newI; + unsigned32 l; + unsigned8 *input; + register unsigned32 *wbp; + unsigned32 workBuff[16], state[4]; + + l = len; + + state[0] = 0x67452301; + state[1] = 0xEFCDAB89; + state[2] = 0x98BADCFE; + state[3] = 0x10325476; + + if ((input = createPaddedCopyWithLength(b, &l)) == NULL) + return 0; + + for (i = 0;;) { + if ((newI = i + 16 * 4) > l) + break; + k = i + 3; + for (j = 0; j < 16; j++) { + wbp = (workBuff + j); + *wbp = input[k--]; + *wbp <<= 8; + *wbp |= input[k--]; + *wbp <<= 8; + *wbp |= input[k--]; + *wbp <<= 8; + *wbp |= input[k]; + k += 7; + } + doTheRounds(workBuff, state); + i = newI; + } + free(input); + + j = 0; + for (i = 0; i < 4; i++) { + k = state[i]; + sum[j++] = (k & 0xFF); + k >>= 8; + sum[j++] = (k & 0xFF); + k >>= 8; + sum[j++] = (k & 0xFF); + k >>= 8; + sum[j++] = (k & 0xFF); + } + return 1; +} + +static void +bytesToHex(unsigned8 b[16], char *s) +{ + static char *hex = "0123456789abcdef"; + int q, w; + + for (q = 0, w = 0; q < 16; q++) { + s[w++] = hex[(b[q] >> 4) & 0x0F]; + s[w++] = hex[b[q] & 0x0F]; + } + s[w] = '\0'; +} + +/* + * PUBLIC FUNCTIONS + */ + +/* + * md5_hash + * + * Calculates the MD5 sum of the bytes in a buffer. + * + * SYNOPSIS #include "md5.h" + * int md5_hash(const void *buff, size_t len, char *hexsum) + * + * INPUT buff the buffer containing the bytes that you want + * the MD5 sum of. + * len number of bytes in the buffer. + * + * OUTPUT hexsum the MD5 sum as a '\0'-terminated string of + * hexadecimal digits. an MD5 sum is 16 bytes long. + * each byte is represented by two heaxadecimal + * characters. you thus need to provide an array + * of 33 characters, including the trailing '\0'. + * + * RETURNS 0 on failure (out of memory for internal buffers) or + * non-zero on success. + * + * STANDARDS MD5 is described in RFC 1321. + * + * AUTHOR Sverre H. Huseby + * + */ +bool +md5_hash(const void *buff, size_t len, char *hexsum) +{ + unsigned8 sum[16]; + + if (!calculateDigestFromBuffer((unsigned8 *) buff, len, sum)) + return false; + + bytesToHex(sum, hexsum); + return true; +} + + + +/* + * puts md5(username+passwd) in buf provided buflen is at least 36 bytes + * returns 1 on success, 0 on any kind of failure and sets errno accordingly + */ +bool EncryptMD5(const char *passwd, const char *salt, char *buf) +{ + char crypt_buf[128]; + + if (strlen(salt) + strlen(passwd) > 127) + return false; + + strcpy(buf, "md5"); + memset(crypt_buf, 0, 128); + sprintf(crypt_buf,"%s%s", salt, passwd); + + return md5_hash(crypt_buf, strlen(crypt_buf), buf + 3); +} diff --git a/src/include/libpq/md5.h b/src/include/libpq/md5.h new file mode 100644 index 0000000000..c30ad0ce61 --- /dev/null +++ b/src/include/libpq/md5.h @@ -0,0 +1,21 @@ +/*------------------------------------------------------------------------- + * + * md5.h + * Interface to hba.c + * + * + *------------------------------------------------------------------------- + */ +#ifndef PG_MD5_H +#define PG_MD5_H + +extern bool md5_hash(const void *buff, size_t len, char *hexsum); +extern bool CheckMD5Pwd(char *passwd, char *storedpwd, char *seed); +extern bool EncryptMD5(const char *passwd, const char *salt, char *buf); + +#define MD5_PASSWD_LEN 35 + +#define isMD5(passwd) (strncmp((passwd),"md5",3) == 0 && \ + strlen(passwd) == MD5_PASSWD_LEN) + +#endif