srp.c

iscsi源代码 UNH的progect 有initiator端和target端的源码

/*	security/srp/srp.c

	vi: set autoindent tabstop=8 shiftwidth=4 :

*/
/*
	Copyright (C) 2001-2003 InterOperability Lab (IOL)
	University of New Hampshier (UNH)
	Durham, NH 03824

	This program is free software; you can redistribute it and/or modify
	it under the terms of the GNU General Public License as published by
	the Free Software Foundation; either version 2, or (at your option)
	any later version.

	This program is distributed in the hope that it will be useful,
	but WITHOUT ANY WARRANTY; without even the implied warranty of
	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
	GNU General Public License for more details.

	You should have received a copy of the GNU General Public License
	along with this program; if not, write to the Free Software
	Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
	USA.

	The name of IOL and/or UNH may not be used to endorse or promote products
	derived from this software without specific prior written permission.
*/

#include <linux/string.h>
#include <linux/slab.h>
#include <linux/stddef.h>

#include "../../common/iscsi_common.h"
#include "../../common/debug.h"

#include "../../common/my_memory.h"

#include "srp.h"

#include "../misc/misc_func.h"
#include "../hash/sha1.h"
#include "../math/bigint.h"

// inner functions

static char SRP_768_N[] = {
	0xB3, 0x44, 0xC7, 0xC4, 0xF8, 0xC4, 0x95, 0x03,
	0x1B, 0xB4, 0xE0, 0x4F, 0xF8, 0xF8, 0x4E, 0xE9,
	0x50, 0x08, 0x16, 0x39, 0x40, 0xB9, 0x55, 0x82,
	0x76, 0x74, 0x4D, 0x91, 0xF7, 0xCC, 0x9F, 0x40,
	0x26, 0x53, 0xBE, 0x71, 0x47, 0xF0, 0x0F, 0x57,
	0x6B, 0x93, 0x75, 0x4B, 0xCD, 0xDF, 0x71, 0xB6,
	0x36, 0xF2, 0x09, 0x9E, 0x6F, 0xFF, 0x90, 0xE7,
	0x95, 0x75, 0xF3, 0xD0, 0xDE, 0x69, 0x4A, 0xFF,
	0x73, 0x7D, 0x9B, 0xE9, 0x71, 0x3C, 0xEF, 0x8D,
	0x83, 0x7A, 0xDA, 0x63, 0x80, 0xB1, 0x09, 0x3E,
	0x94, 0xB6, 0xA5, 0x29, 0xA8, 0xC6, 0xC2, 0xBE,
	0x33, 0xE0, 0x86, 0x7C, 0x60, 0xC3, 0x26, 0x2B
};

static char SRP_768_G[] = { 2 };

static char SRP_1024_N[] = {
	0xEE, 0xAF, 0x0A, 0xB9, 0xAD, 0xB3, 0x8D, 0xD6,
	0x9C, 0x33, 0xF8, 0x0A, 0xFA, 0x8F, 0xC5, 0xE8,
	0x60, 0x72, 0x61, 0x87, 0x75, 0xFF, 0x3C, 0x0B,
	0x9E, 0xA2, 0x31, 0x4C, 0x9C, 0x25, 0x65, 0x76,
	0xD6, 0x74, 0xDF, 0x74, 0x96, 0xEA, 0x81, 0xD3,
	0x38, 0x3B, 0x48, 0x13, 0xD6, 0x92, 0xC6, 0xE0,
	0xE0, 0xD5, 0xD8, 0xE2, 0x50, 0xB9, 0x8B, 0xE4,
	0x8E, 0x49, 0x5C, 0x1D, 0x60, 0x89, 0xDA, 0xD1,
	0x5D, 0xC7, 0xD7, 0xB4, 0x61, 0x54, 0xD6, 0xB6,
	0xCE, 0x8E, 0xF4, 0xAD, 0x69, 0xB1, 0x5D, 0x49,
	0x82, 0x55, 0x9B, 0x29, 0x7B, 0xCF, 0x18, 0x85,
	0xC5, 0x29, 0xF5, 0x66, 0x66, 0x0E, 0x57, 0xEC,
	0x68, 0xED, 0xBC, 0x3C, 0x05, 0x72, 0x6C, 0xC0,
	0x2F, 0xD4, 0xCB, 0xF4, 0x97, 0x6E, 0xAA, 0x9A,
	0xFD, 0x51, 0x38, 0xFE, 0x83, 0x76, 0x43, 0x5B,
	0x9F, 0xC6, 0x1D, 0x2F, 0xC0, 0xEB, 0x06, 0xE3
};

static char SRP_1024_G[] = { 2 };

static char SRP_1280_N[] = {
	0xD7, 0x79, 0x46, 0x82, 0x6E, 0x81, 0x19, 0x14,
	0xB3, 0x94, 0x01, 0xD5, 0x6A, 0x0A, 0x78, 0x43,
	0xA8, 0xE7, 0x57, 0x5D, 0x73, 0x8C, 0x67, 0x2A,
	0x09, 0x0A, 0xB1, 0x18, 0x7D, 0x69, 0x0D, 0xC4,
	0x38, 0x72, 0xFC, 0x06, 0xA7, 0xB6, 0xA4, 0x3F,
	0x3B, 0x95, 0xBE, 0xAE, 0xC7, 0xDF, 0x04, 0xB9,
	0xD2, 0x42, 0xEB, 0xDC, 0x48, 0x11, 0x11, 0x28,
	0x32, 0x16, 0xCE, 0x81, 0x6E, 0x00, 0x4B, 0x78,
	0x6C, 0x5F, 0xCE, 0x85, 0x67, 0x80, 0xD4, 0x18,
	0x37, 0xD9, 0x5A, 0xD7, 0x87, 0xA5, 0x0B, 0xBE,
	0x90, 0xBD, 0x3A, 0x9C, 0x98, 0xAC, 0x0F, 0x5F,
	0xC0, 0xDE, 0x74, 0x4B, 0x1C, 0xDE, 0x18, 0x91,
	0x69, 0x08, 0x94, 0xBC, 0x1F, 0x65, 0xE0, 0x0D,
	0xE1, 0x5B, 0x4B, 0x2A, 0xA6, 0xD8, 0x71, 0x00,
	0xC9, 0xEC, 0xC2, 0x52, 0x7E, 0x45, 0xEB, 0x84,
	0x9D, 0xEB, 0x14, 0xBB, 0x20, 0x49, 0xB1, 0x63,
	0xEA, 0x04, 0x18, 0x7F, 0xD2, 0x7C, 0x1B, 0xD9,
	0xC7, 0x95, 0x8C, 0xD4, 0x0C, 0xE7, 0x06, 0x7A,
	0x9C, 0x02, 0x4F, 0x9B, 0x7C, 0x5A, 0x0B, 0x4F,
	0x50, 0x03, 0x68, 0x61, 0x61, 0xF0, 0x60, 0x5B
};

static char SRP_1280_G[] = { 2 };

static char SRP_1536_N[] = {
	0x9D, 0xEF, 0x3C, 0xAF, 0xB9, 0x39, 0x27, 0x7A,
	0xB1, 0xF1, 0x2A, 0x86, 0x17, 0xA4, 0x7B, 0xBB,
	0xDB, 0xA5, 0x1D, 0xF4, 0x99, 0xAC, 0x4C, 0x80,
	0xBE, 0xEE, 0xA9, 0x61, 0x4B, 0x19, 0xCC, 0x4D,
	0x5F, 0x4F, 0x5F, 0x55, 0x6E, 0x27, 0xCB, 0xDE,
	0x51, 0xC6, 0xA9, 0x4B, 0xE4, 0x60, 0x7A, 0x29,
	0x15, 0x58, 0x90, 0x3B, 0xA0, 0xD0, 0xF8, 0x43,
	0x80, 0xB6, 0x55, 0xBB, 0x9A, 0x22, 0xE8, 0xDC,
	0xDF, 0x02, 0x8A, 0x7C, 0xEC, 0x67, 0xF0, 0xD0,
	0x81, 0x34, 0xB1, 0xC8, 0xB9, 0x79, 0x89, 0x14,
	0x9B, 0x60, 0x9E, 0x0B, 0xE3, 0xBA, 0xB6, 0x3D,
	0x47, 0x54, 0x83, 0x81, 0xDB, 0xC5, 0xB1, 0xFC,
	0x76, 0x4E, 0x3F, 0x4B, 0x53, 0xDD, 0x9D, 0xA1,
	0x15, 0x8B, 0xFD, 0x3E, 0x2B, 0x9C, 0x8C, 0xF5,
	0x6E, 0xDF, 0x01, 0x95, 0x39, 0x34, 0x96, 0x27,
	0xDB, 0x2F, 0xD5, 0x3D, 0x24, 0xB7, 0xC4, 0x86,
	0x65, 0x77, 0x2E, 0x43, 0x7D, 0x6C, 0x7F, 0x8C,
	0xE4, 0x42, 0x73, 0x4A, 0xF7, 0xCC, 0xB7, 0xAE,
	0x83, 0x7C, 0x26, 0x4A, 0xE3, 0xA9, 0xBE, 0xB8,
	0x7F, 0x8A, 0x2F, 0xE9, 0xB8, 0xB5, 0x29, 0x2E,
	0x5A, 0x02, 0x1F, 0xFF, 0x5E, 0x91, 0x47, 0x9E,
	0x8C, 0xE7, 0xA2, 0x8C, 0x24, 0x42, 0xC6, 0xF3,
	0x15, 0x18, 0x0F, 0x93, 0x49, 0x9A, 0x23, 0x4D,
	0xCF, 0x76, 0xE3, 0xFE, 0xD1, 0x35, 0xF9, 0xBB
};

static char SRP_1536_G[] = { 2 };

static char SRP_2048_N[] = {
	0xAC, 0x6B, 0xDB, 0x41, 0x32, 0x4A, 0x9A, 0x9B,
	0xF1, 0x66, 0xDE, 0x5E, 0x13, 0x89, 0x58, 0x2F,
	0xAF, 0x72, 0xB6, 0x65, 0x19, 0x87, 0xEE, 0x07,
	0xFC, 0x31, 0x92, 0x94, 0x3D, 0xB5, 0x60, 0x50,
	0xA3, 0x73, 0x29, 0xCB, 0xB4, 0xA0, 0x99, 0xED,
	0x81, 0x93, 0xE0, 0x75, 0x77, 0x67, 0xA1, 0x3D,
	0xD5, 0x23, 0x12, 0xAB, 0x4B, 0x03, 0x31, 0x0D,
	0xCD, 0x7F, 0x48, 0xA9, 0xDA, 0x04, 0xFD, 0x50,
	0xE8, 0x08, 0x39, 0x69, 0xED, 0xB7, 0x67, 0xB0,
	0xCF, 0x60, 0x95, 0x17, 0x9A, 0x16, 0x3A, 0xB3,
	0x66, 0x1A, 0x05, 0xFB, 0xD5, 0xFA, 0xAA, 0xE8,
	0x29, 0x18, 0xA9, 0x96, 0x2F, 0x0B, 0x93, 0xB8,
	0x55, 0xF9, 0x79, 0x93, 0xEC, 0x97, 0x5E, 0xEA,
	0xA8, 0x0D, 0x74, 0x0A, 0xDB, 0xF4, 0xFF, 0x74,
	0x73, 0x59, 0xD0, 0x41, 0xD5, 0xC3, 0x3E, 0xA7,
	0x1D, 0x28, 0x1E, 0x44, 0x6B, 0x14, 0x77, 0x3B,
	0xCA, 0x97, 0xB4, 0x3A, 0x23, 0xFB, 0x80, 0x16,
	0x76, 0xBD, 0x20, 0x7A, 0x43, 0x6C, 0x64, 0x81,
	0xF1, 0xD2, 0xB9, 0x07, 0x87, 0x17, 0x46, 0x1A,
	0x5B, 0x9D, 0x32, 0xE6, 0x88, 0xF8, 0x77, 0x48,
	0x54, 0x45, 0x23, 0xB5, 0x24, 0xB0, 0xD5, 0x7D,
	0x5E, 0xA7, 0x7A, 0x27, 0x75, 0xD2, 0xEC, 0xFA,
	0x03, 0x2C, 0xFB, 0xDB, 0xF5, 0x2F, 0xB3, 0x78,
	0x61, 0x60, 0x27, 0x90, 0x04, 0xE5, 0x7A, 0xE6,
	0xAF, 0x87, 0x4E, 0x73, 0x03, 0xCE, 0x53, 0x29,
	0x9C, 0xCC, 0x04, 0x1C, 0x7B, 0xC3, 0x08, 0xD8,
	0x2A, 0x56, 0x98, 0xF3, 0xA8, 0xD0, 0xC3, 0x82,
	0x71, 0xAE, 0x35, 0xF8, 0xE9, 0xDB, 0xFB, 0xB6,
	0x94, 0xB5, 0xC8, 0x03, 0xD8, 0x9F, 0x7A, 0xE4,
	0x35, 0xDE, 0x23, 0x6D, 0x52, 0x5F, 0x54, 0x75,
	0x9B, 0x65, 0xE3, 0x72, 0xFC, 0xD6, 0x8E, 0xF2,
	0x0F, 0xA7, 0x11, 0x1F, 0x9E, 0x4A, 0xFF, 0x73
};

static char SRP_2048_G[] = { 2 };

static char *SRP_GROUP_NAMES[SRP_N_GROUPS] =
    { "SRP-768", "SRP-1024", "SRP-1280", "SRP-1536", "SRP-2048" };

void
ClearSRPContext(struct SRP_Context * p_context)
{
	/*      most fields set to 0 or NULL */
	memset(p_context, 0, sizeof (struct SRP_Context));
	p_context->format = HEX_FORMAT;
	p_context->group = SRP_1536;
	SRP_SetSRPGroup(SRP_GROUP_NAMES[p_context->group], p_context);
}

int __attribute__ ((no_instrument_function))
CloneDataUnit(struct dataunit * dst, struct dataunit * src)
{
	if ((src->length > 0) && (src->data)) {
		my_kfree((void **) &dst->data, "clone data unit");
		if ((dst->data = my_kmalloc(src->length,
					    "dataunit data")) == NULL)
			return 0;
		memcpy(dst->data, src->data, src->length);
		dst->length = src->length;
	}
	return 1;
}

int
CalculateVerifier(struct SRP_Context * p_context)
{
	struct bigint_t N;
	struct bigint_t X;
	struct bigint_t generator;
	struct bigint_t verifier;
	int ret;

	ret = 0;
	if ((p_context == NULL) ||
	    (p_context->X.length == 0) ||
	    (p_context->N.length == 0) || (p_context->generator.length == 0))
		return 0;

	if (!bigint_init_bin(&X, p_context->X.data, p_context->X.length))
		goto out;

	if (!bigint_init_bin(&N, p_context->N.data, p_context->N.length))
		goto out;

	if (!bigint_init_bin(&generator, p_context->generator.data,
			     p_context->generator.length))
		goto out;

	if (!bigint_init(&verifier, 0))
		goto out;

	if (!bigint_mod_exp_mont(&verifier, &generator, &X, &N))
		goto out;

	p_context->verifier.length = bigint_binlen(&verifier);

	my_kfree((void **) &p_context->verifier.data, "verifier");

	if ((p_context->verifier.data =
	     (char *) my_kmalloc(p_context->verifier.length,
				 "verifier")) == NULL)
		goto out;

	if (!bigint_tobin(&verifier, p_context->verifier.data))
		goto out;

	ret = 1;
      out:
	bigint_clean(&N);
	bigint_clean(&X);
	bigint_clean(&generator);
	bigint_clean(&verifier);
	return ret;
}

int
CalculateX(struct SRP_Context * p_context)
{
	unsigned long long len;
	unsigned int namelen;
	unsigned int secretlen;
	char *temp;
	char digest[20];

	if ((p_context == NULL) ||
	    (p_context->name == NULL) || (p_context->secret == NULL))
		return 0;

	namelen = strlen(p_context->name);
	secretlen = strlen(p_context->secret);
	len = namelen + secretlen + 1;

	if ((temp = (char *) my_kmalloc(len, "temp")) == NULL)
		return 0;

	memcpy(temp, p_context->name, namelen);
	temp[namelen] = ':';
	memcpy(temp + namelen + 1, p_context->secret, secretlen);
	SHA1_ProcessMessage(temp, (len * 8) >> 32, (int) (len * 8), digest);
	len = p_context->salt.length + 20;
	my_kfree((void **) &temp, "temp");
	if ((temp = (char *) my_kmalloc(len, "temp")) == NULL)
		return 0;
	p_context->X.length = 20;
	if ((p_context->X.data = (char *) my_kmalloc(20, "X")) == NULL) {
		my_kfree((void **) &temp, "temp");
		return 0;
	}
	memcpy(temp, p_context->salt.data, p_context->salt.length);
	memcpy(temp + p_context->salt.length, digest, 20);
	SHA1_ProcessMessage(temp, (len * 8) >> 32, (int) (len * 8),
			    p_context->X.data);
	my_kfree((void **) &temp, "temp");
	return 1;
}

int
CalculateA(struct SRP_Context * p_context)
{
	struct bigint_t N;
	struct bigint_t a;
	struct bigint_t generator;
	struct bigint_t A;
	int ret;

	ret = 0;
	if ((p_context == NULL) ||
	    (p_context->N.length == 0) || (p_context->generator.length == 0))
		return 0;

	p_context->a.length = SRP_A_LENGTH;
	if ((p_context->a.data =
	     (char *) my_kmalloc(SRP_A_LENGTH, "a")) == NULL)
		goto out;
	RandomNumberGenerate(p_context->a.data, SRP_A_LENGTH);

	if (!bigint_init_bin(&a, p_context->a.data, p_context->a.length))
		goto out;

	if (!bigint_init_bin(&N, p_context->N.data, p_context->N.length))
		goto out;

	if (!bigint_init_bin(&generator, p_context->generator.data,
			     p_context->generator.length))
		goto out;

	if (!bigint_init(&A, 0))
		goto out;

	if (!bigint_mod_exp_mont(&A, &generator, &a, &N))
		goto out;

	p_context->A.length = bigint_binlen(&A);

	my_kfree((void **) &p_context->A.data, "A");

	if ((p_context->A.data = (char *) my_kmalloc(p_context->A.length,
						     "A")) == NULL)
		goto out;

	if (!bigint_tobin(&A, p_context->A.data))
		goto out;

	ret = 1;
      out:
	bigint_clean(&N);
	bigint_clean(&a);
	bigint_clean(&generator);
	bigint_clean(&A);
	return ret;
}

int
CalculateInitiatorS(struct SRP_Context * p_context)
{
	unsigned long long len;
	struct bigint_t N;
	struct bigint_t a;
	struct bigint_t generator;
	struct bigint_t B;
	struct bigint_t u;
	struct bigint_t X;
	struct bigint_t temp1;
	struct bigint_t temp2;
	struct bigint_t temp3;
	char digest[20];
	int ret;

	ret = 0;
	if ((p_context == NULL) ||
	    (p_context->N.length == 0) ||
	    (p_context->a.length == 0) ||
	    (p_context->B.length == 0) ||
	    (p_context->X.length == 0) || (p_context->generator.length == 0))
		return 0;

	if (!bigint_init_bin(&N, p_context->N.data, p_context->N.length))
		goto out;

	if (!bigint_init_bin(&a, p_context->a.data, p_context->a.length))
		goto out;

	if (!bigint_init_bin(&generator, p_context->generator.data,
			     p_context->generator.length))
		goto out;

	if (!bigint_init_bin(&B, p_context->B.data, p_context->B.length))
		goto out;

	if (!bigint_init_bin(&X, p_context->X.data, p_context->X.length))
		goto out;

	if (!bigint_init(&temp1, 0))
		goto out;

	if (!bigint_init(&temp2, 0))
		goto out;

	if (!bigint_init(&temp3, 0))
		goto out;

	len = p_context->B.length * 8;
	SHA1_ProcessMessage(p_context->B.data,
			    (int) (len >> 32), (int) len, digest);

	p_context->u.length = 4;
	if ((p_context->u.data = (char *) my_kmalloc(4, "u")) == NULL)
		goto out;

	memcpy(p_context->u.data, digest, 4);

	if (!bigint_init_bin(&u, p_context->u.data, p_context->u.length))
		goto out;

	if (!bigint_mod_exp_mont(&temp2, &generator, &X, &N))
		goto out;

	if (!bigint_mod_sub(&temp1, &B, &temp2, &N))
		goto out;

	if (!bigint_mul(&temp3, &u, &X))
		goto out;

	if (!bigint_add(&temp2, &a, &temp3))
		goto out;

	if (!bigint_mod_exp_mont(&temp3, &temp1, &temp2, &N))
		goto out;

	p_context->S.length = bigint_binlen(&temp3);

	my_kfree((void **) &p_context->S.data, "S");

	if ((p_context->S.data = (char *) my_kmalloc(p_context->S.length,
						     "S")) == NULL)
		goto out;

	if (!bigint_tobin(&temp3, p_context->S.data))
		goto out;

	ret = 1;
      out:
	bigint_clean(&N);
	bigint_clean(&a);
	bigint_clean(&generator);
	bigint_clean(&B);
	bigint_clean(&u);
	bigint_clean(&X);
	bigint_clean(&temp1);
	bigint_clean(&temp2);
	bigint_clean(&temp3);
	return ret;
}

int
CalculateK(struct SRP_Context * p_context)
{
	if ((p_context == NULL) || (p_context->S.length == 0))