1 #include <netinet/in.h>
2 #ifdef __sun__
3 #include <inttypes.h>
4 #else
5 #include <stdint.h>
6 #endif
7 #include <ctype.h>
8 #include <errno.h>
9 #include <string.h>
10 #include <limits.h>
11 #include "modpost.h"
12 
13 /*
14  * Stolen form Cryptographic API.
15  *
16  * MD4 Message Digest Algorithm (RFC1320).
17  *
18  * Implementation derived from Andrew Tridgell and Steve French's
19  * CIFS MD4 implementation, and the cryptoapi implementation
20  * originally based on the public domain implementation written
21  * by Colin Plumb in 1993.
22  *
23  * Copyright (c) Andrew Tridgell 1997-1998.
24  * Modified by Steve French (sfrench@us.ibm.com) 2002
25  * Copyright (c) Cryptoapi developers.
26  * Copyright (c) 2002 David S. Miller (davem@redhat.com)
27  * Copyright (c) 2002 James Morris <jmorris@intercode.com.au>
28  *
29  * This program is free software; you can redistribute it and/or modify
30  * it under the terms of the GNU General Public License as published by
31  * the Free Software Foundation; either version 2 of the License, or
32  * (at your option) any later version.
33  *
34  */
35 #define MD4_DIGEST_SIZE		16
36 #define MD4_HMAC_BLOCK_SIZE	64
37 #define MD4_BLOCK_WORDS		16
38 #define MD4_HASH_WORDS		4
39 
40 struct md4_ctx {
41 	uint32_t hash[MD4_HASH_WORDS];
42 	uint32_t block[MD4_BLOCK_WORDS];
43 	uint64_t byte_count;
44 };
45 
lshift(uint32_t x,unsigned int s)46 static inline uint32_t lshift(uint32_t x, unsigned int s)
47 {
48 	x &= 0xFFFFFFFF;
49 	return ((x << s) & 0xFFFFFFFF) | (x >> (32 - s));
50 }
51 
F(uint32_t x,uint32_t y,uint32_t z)52 static inline uint32_t F(uint32_t x, uint32_t y, uint32_t z)
53 {
54 	return (x & y) | ((~x) & z);
55 }
56 
G(uint32_t x,uint32_t y,uint32_t z)57 static inline uint32_t G(uint32_t x, uint32_t y, uint32_t z)
58 {
59 	return (x & y) | (x & z) | (y & z);
60 }
61 
H(uint32_t x,uint32_t y,uint32_t z)62 static inline uint32_t H(uint32_t x, uint32_t y, uint32_t z)
63 {
64 	return x ^ y ^ z;
65 }
66 
67 #define ROUND1(a,b,c,d,k,s) (a = lshift(a + F(b,c,d) + k, s))
68 #define ROUND2(a,b,c,d,k,s) (a = lshift(a + G(b,c,d) + k + (uint32_t)0x5A827999,s))
69 #define ROUND3(a,b,c,d,k,s) (a = lshift(a + H(b,c,d) + k + (uint32_t)0x6ED9EBA1,s))
70 
71 /* XXX: this stuff can be optimized */
le32_to_cpu_array(uint32_t * buf,unsigned int words)72 static inline void le32_to_cpu_array(uint32_t *buf, unsigned int words)
73 {
74 	while (words--) {
75 		*buf = ntohl(*buf);
76 		buf++;
77 	}
78 }
79 
cpu_to_le32_array(uint32_t * buf,unsigned int words)80 static inline void cpu_to_le32_array(uint32_t *buf, unsigned int words)
81 {
82 	while (words--) {
83 		*buf = htonl(*buf);
84 		buf++;
85 	}
86 }
87 
md4_transform(uint32_t * hash,uint32_t const * in)88 static void md4_transform(uint32_t *hash, uint32_t const *in)
89 {
90 	uint32_t a, b, c, d;
91 
92 	a = hash[0];
93 	b = hash[1];
94 	c = hash[2];
95 	d = hash[3];
96 
97 	ROUND1(a, b, c, d, in[0], 3);
98 	ROUND1(d, a, b, c, in[1], 7);
99 	ROUND1(c, d, a, b, in[2], 11);
100 	ROUND1(b, c, d, a, in[3], 19);
101 	ROUND1(a, b, c, d, in[4], 3);
102 	ROUND1(d, a, b, c, in[5], 7);
103 	ROUND1(c, d, a, b, in[6], 11);
104 	ROUND1(b, c, d, a, in[7], 19);
105 	ROUND1(a, b, c, d, in[8], 3);
106 	ROUND1(d, a, b, c, in[9], 7);
107 	ROUND1(c, d, a, b, in[10], 11);
108 	ROUND1(b, c, d, a, in[11], 19);
109 	ROUND1(a, b, c, d, in[12], 3);
110 	ROUND1(d, a, b, c, in[13], 7);
111 	ROUND1(c, d, a, b, in[14], 11);
112 	ROUND1(b, c, d, a, in[15], 19);
113 
114 	ROUND2(a, b, c, d,in[ 0], 3);
115 	ROUND2(d, a, b, c, in[4], 5);
116 	ROUND2(c, d, a, b, in[8], 9);
117 	ROUND2(b, c, d, a, in[12], 13);
118 	ROUND2(a, b, c, d, in[1], 3);
119 	ROUND2(d, a, b, c, in[5], 5);
120 	ROUND2(c, d, a, b, in[9], 9);
121 	ROUND2(b, c, d, a, in[13], 13);
122 	ROUND2(a, b, c, d, in[2], 3);
123 	ROUND2(d, a, b, c, in[6], 5);
124 	ROUND2(c, d, a, b, in[10], 9);
125 	ROUND2(b, c, d, a, in[14], 13);
126 	ROUND2(a, b, c, d, in[3], 3);
127 	ROUND2(d, a, b, c, in[7], 5);
128 	ROUND2(c, d, a, b, in[11], 9);
129 	ROUND2(b, c, d, a, in[15], 13);
130 
131 	ROUND3(a, b, c, d,in[ 0], 3);
132 	ROUND3(d, a, b, c, in[8], 9);
133 	ROUND3(c, d, a, b, in[4], 11);
134 	ROUND3(b, c, d, a, in[12], 15);
135 	ROUND3(a, b, c, d, in[2], 3);
136 	ROUND3(d, a, b, c, in[10], 9);
137 	ROUND3(c, d, a, b, in[6], 11);
138 	ROUND3(b, c, d, a, in[14], 15);
139 	ROUND3(a, b, c, d, in[1], 3);
140 	ROUND3(d, a, b, c, in[9], 9);
141 	ROUND3(c, d, a, b, in[5], 11);
142 	ROUND3(b, c, d, a, in[13], 15);
143 	ROUND3(a, b, c, d, in[3], 3);
144 	ROUND3(d, a, b, c, in[11], 9);
145 	ROUND3(c, d, a, b, in[7], 11);
146 	ROUND3(b, c, d, a, in[15], 15);
147 
148 	hash[0] += a;
149 	hash[1] += b;
150 	hash[2] += c;
151 	hash[3] += d;
152 }
153 
md4_transform_helper(struct md4_ctx * ctx)154 static inline void md4_transform_helper(struct md4_ctx *ctx)
155 {
156 	le32_to_cpu_array(ctx->block, ARRAY_SIZE(ctx->block));
157 	md4_transform(ctx->hash, ctx->block);
158 }
159 
md4_init(struct md4_ctx * mctx)160 static void md4_init(struct md4_ctx *mctx)
161 {
162 	mctx->hash[0] = 0x67452301;
163 	mctx->hash[1] = 0xefcdab89;
164 	mctx->hash[2] = 0x98badcfe;
165 	mctx->hash[3] = 0x10325476;
166 	mctx->byte_count = 0;
167 }
168 
md4_update(struct md4_ctx * mctx,const unsigned char * data,unsigned int len)169 static void md4_update(struct md4_ctx *mctx,
170 		       const unsigned char *data, unsigned int len)
171 {
172 	const uint32_t avail = sizeof(mctx->block) - (mctx->byte_count & 0x3f);
173 
174 	mctx->byte_count += len;
175 
176 	if (avail > len) {
177 		memcpy((char *)mctx->block + (sizeof(mctx->block) - avail),
178 		       data, len);
179 		return;
180 	}
181 
182 	memcpy((char *)mctx->block + (sizeof(mctx->block) - avail),
183 	       data, avail);
184 
185 	md4_transform_helper(mctx);
186 	data += avail;
187 	len -= avail;
188 
189 	while (len >= sizeof(mctx->block)) {
190 		memcpy(mctx->block, data, sizeof(mctx->block));
191 		md4_transform_helper(mctx);
192 		data += sizeof(mctx->block);
193 		len -= sizeof(mctx->block);
194 	}
195 
196 	memcpy(mctx->block, data, len);
197 }
198 
md4_final_ascii(struct md4_ctx * mctx,char * out,unsigned int len)199 static void md4_final_ascii(struct md4_ctx *mctx, char *out, unsigned int len)
200 {
201 	const unsigned int offset = mctx->byte_count & 0x3f;
202 	char *p = (char *)mctx->block + offset;
203 	int padding = 56 - (offset + 1);
204 
205 	*p++ = 0x80;
206 	if (padding < 0) {
207 		memset(p, 0x00, padding + sizeof (uint64_t));
208 		md4_transform_helper(mctx);
209 		p = (char *)mctx->block;
210 		padding = 56;
211 	}
212 
213 	memset(p, 0, padding);
214 	mctx->block[14] = mctx->byte_count << 3;
215 	mctx->block[15] = mctx->byte_count >> 29;
216 	le32_to_cpu_array(mctx->block, (sizeof(mctx->block) -
217 			  sizeof(uint64_t)) / sizeof(uint32_t));
218 	md4_transform(mctx->hash, mctx->block);
219 	cpu_to_le32_array(mctx->hash, ARRAY_SIZE(mctx->hash));
220 
221 	snprintf(out, len, "%08X%08X%08X%08X",
222 		 mctx->hash[0], mctx->hash[1], mctx->hash[2], mctx->hash[3]);
223 }
224 
add_char(unsigned char c,struct md4_ctx * md)225 static inline void add_char(unsigned char c, struct md4_ctx *md)
226 {
227 	md4_update(md, &c, 1);
228 }
229 
parse_string(const char * file,unsigned long len,struct md4_ctx * md)230 static int parse_string(const char *file, unsigned long len,
231 			struct md4_ctx *md)
232 {
233 	unsigned long i;
234 
235 	add_char(file[0], md);
236 	for (i = 1; i < len; i++) {
237 		add_char(file[i], md);
238 		if (file[i] == '"' && file[i-1] != '\\')
239 			break;
240 	}
241 	return i;
242 }
243 
parse_comment(const char * file,unsigned long len)244 static int parse_comment(const char *file, unsigned long len)
245 {
246 	unsigned long i;
247 
248 	for (i = 2; i < len; i++) {
249 		if (file[i-1] == '*' && file[i] == '/')
250 			break;
251 	}
252 	return i;
253 }
254 
255 /* FIXME: Handle .s files differently (eg. # starts comments) --RR */
parse_file(const char * fname,struct md4_ctx * md)256 static int parse_file(const char *fname, struct md4_ctx *md)
257 {
258 	char *file;
259 	unsigned long i, len;
260 
261 	file = read_text_file(fname);
262 	len = strlen(file);
263 
264 	for (i = 0; i < len; i++) {
265 		/* Collapse and ignore \ and CR. */
266 		if (file[i] == '\\' && (i+1 < len) && file[i+1] == '\n') {
267 			i++;
268 			continue;
269 		}
270 
271 		/* Ignore whitespace */
272 		if (isspace(file[i]))
273 			continue;
274 
275 		/* Handle strings as whole units */
276 		if (file[i] == '"') {
277 			i += parse_string(file+i, len - i, md);
278 			continue;
279 		}
280 
281 		/* Comments: ignore */
282 		if (file[i] == '/' && file[i+1] == '*') {
283 			i += parse_comment(file+i, len - i);
284 			continue;
285 		}
286 
287 		add_char(file[i], md);
288 	}
289 	free(file);
290 	return 1;
291 }
292 /* Check whether the file is a static library or not */
is_static_library(const char * objfile)293 static bool is_static_library(const char *objfile)
294 {
295 	int len = strlen(objfile);
296 
297 	return objfile[len - 2] == '.' && objfile[len - 1] == 'a';
298 }
299 
300 /* We have dir/file.o.  Open dir/.file.o.cmd, look for source_ and deps_ line
301  * to figure out source files. */
parse_source_files(const char * objfile,struct md4_ctx * md)302 static int parse_source_files(const char *objfile, struct md4_ctx *md)
303 {
304 	char *cmd, *file, *line, *dir, *pos;
305 	const char *base;
306 	int dirlen, ret = 0, check_files = 0;
307 
308 	cmd = NOFAIL(malloc(strlen(objfile) + sizeof("..cmd")));
309 
310 	base = strrchr(objfile, '/');
311 	if (base) {
312 		base++;
313 		dirlen = base - objfile;
314 		sprintf(cmd, "%.*s.%s.cmd", dirlen, objfile, base);
315 	} else {
316 		dirlen = 0;
317 		sprintf(cmd, ".%s.cmd", objfile);
318 	}
319 	dir = NOFAIL(malloc(dirlen + 1));
320 	strncpy(dir, objfile, dirlen);
321 	dir[dirlen] = '\0';
322 
323 	file = read_text_file(cmd);
324 
325 	pos = file;
326 
327 	/* Sum all files in the same dir or subdirs. */
328 	while ((line = get_line(&pos))) {
329 		char* p = line;
330 
331 		if (strncmp(line, "source_", sizeof("source_")-1) == 0) {
332 			p = strrchr(line, ' ');
333 			if (!p) {
334 				warn("malformed line: %s\n", line);
335 				goto out_file;
336 			}
337 			p++;
338 			if (!parse_file(p, md)) {
339 				warn("could not open %s: %s\n",
340 				     p, strerror(errno));
341 				goto out_file;
342 			}
343 			continue;
344 		}
345 		if (strncmp(line, "deps_", sizeof("deps_")-1) == 0) {
346 			check_files = 1;
347 			continue;
348 		}
349 		if (!check_files)
350 			continue;
351 
352 		/* Continue until line does not end with '\' */
353 		if ( *(p + strlen(p)-1) != '\\')
354 			break;
355 		/* Terminate line at first space, to get rid of final ' \' */
356 		while (*p) {
357 			if (isspace(*p)) {
358 				*p = '\0';
359 				break;
360 			}
361 			p++;
362 		}
363 
364 		/* Check if this file is in same dir as objfile */
365 		if ((strstr(line, dir)+strlen(dir)-1) == strrchr(line, '/')) {
366 			if (!parse_file(line, md)) {
367 				warn("could not open %s: %s\n",
368 				     line, strerror(errno));
369 				goto out_file;
370 			}
371 
372 		}
373 
374 	}
375 
376 	/* Everyone parsed OK */
377 	ret = 1;
378 out_file:
379 	free(file);
380 	free(dir);
381 	free(cmd);
382 	return ret;
383 }
384 
385 /* Calc and record src checksum. */
get_src_version(const char * modname,char sum[],unsigned sumlen)386 void get_src_version(const char *modname, char sum[], unsigned sumlen)
387 {
388 	char *buf;
389 	struct md4_ctx md;
390 	char *fname;
391 	char filelist[PATH_MAX + 1];
392 
393 	/* objects for a module are listed in the first line of *.mod file. */
394 	snprintf(filelist, sizeof(filelist), "%s.mod", modname);
395 
396 	buf = read_text_file(filelist);
397 
398 	md4_init(&md);
399 	while ((fname = strsep(&buf, "\n"))) {
400 		if (!*fname)
401 			continue;
402 		if (!(is_static_library(fname)) &&
403 				!parse_source_files(fname, &md))
404 			goto free;
405 	}
406 
407 	md4_final_ascii(&md, sum, sumlen);
408 free:
409 	free(buf);
410 }
411