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
40struct md4_ctx {
41	uint32_t hash[MD4_HASH_WORDS];
42	uint32_t block[MD4_BLOCK_WORDS];
43	uint64_t byte_count;
44};
45
46static inline uint32_t lshift(uint32_t x, unsigned int s)
47{
48	x &= 0xFFFFFFFF;
49	return ((x << s) & 0xFFFFFFFF) | (x >> (32 - s));
50}
51
52static inline uint32_t F(uint32_t x, uint32_t y, uint32_t z)
53{
54	return (x & y) | ((~x) & z);
55}
56
57static inline uint32_t G(uint32_t x, uint32_t y, uint32_t z)
58{
59	return (x & y) | (x & z) | (y & z);
60}
61
62static 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
71static inline void le32_to_cpu_array(uint32_t *buf, unsigned int words)
72{
73	while (words--) {
74		*buf = ntohl(*buf);
75		buf++;
76	}
77}
78
79static inline void cpu_to_le32_array(uint32_t *buf, unsigned int words)
80{
81	while (words--) {
82		*buf = htonl(*buf);
83		buf++;
84	}
85}
86
87static void md4_transform(uint32_t *hash, uint32_t const *in)
88{
89	uint32_t a, b, c, d;
90
91	a = hash[0];
92	b = hash[1];
93	c = hash[2];
94	d = hash[3];
95
96	ROUND1(a, b, c, d, in[0], 3);
97	ROUND1(d, a, b, c, in[1], 7);
98	ROUND1(c, d, a, b, in[2], 11);
99	ROUND1(b, c, d, a, in[3], 19);
100	ROUND1(a, b, c, d, in[4], 3);
101	ROUND1(d, a, b, c, in[5], 7);
102	ROUND1(c, d, a, b, in[6], 11);
103	ROUND1(b, c, d, a, in[7], 19);
104	ROUND1(a, b, c, d, in[8], 3);
105	ROUND1(d, a, b, c, in[9], 7);
106	ROUND1(c, d, a, b, in[10], 11);
107	ROUND1(b, c, d, a, in[11], 19);
108	ROUND1(a, b, c, d, in[12], 3);
109	ROUND1(d, a, b, c, in[13], 7);
110	ROUND1(c, d, a, b, in[14], 11);
111	ROUND1(b, c, d, a, in[15], 19);
112
113	ROUND2(a, b, c, d,in[ 0], 3);
114	ROUND2(d, a, b, c, in[4], 5);
115	ROUND2(c, d, a, b, in[8], 9);
116	ROUND2(b, c, d, a, in[12], 13);
117	ROUND2(a, b, c, d, in[1], 3);
118	ROUND2(d, a, b, c, in[5], 5);
119	ROUND2(c, d, a, b, in[9], 9);
120	ROUND2(b, c, d, a, in[13], 13);
121	ROUND2(a, b, c, d, in[2], 3);
122	ROUND2(d, a, b, c, in[6], 5);
123	ROUND2(c, d, a, b, in[10], 9);
124	ROUND2(b, c, d, a, in[14], 13);
125	ROUND2(a, b, c, d, in[3], 3);
126	ROUND2(d, a, b, c, in[7], 5);
127	ROUND2(c, d, a, b, in[11], 9);
128	ROUND2(b, c, d, a, in[15], 13);
129
130	ROUND3(a, b, c, d,in[ 0], 3);
131	ROUND3(d, a, b, c, in[8], 9);
132	ROUND3(c, d, a, b, in[4], 11);
133	ROUND3(b, c, d, a, in[12], 15);
134	ROUND3(a, b, c, d, in[2], 3);
135	ROUND3(d, a, b, c, in[10], 9);
136	ROUND3(c, d, a, b, in[6], 11);
137	ROUND3(b, c, d, a, in[14], 15);
138	ROUND3(a, b, c, d, in[1], 3);
139	ROUND3(d, a, b, c, in[9], 9);
140	ROUND3(c, d, a, b, in[5], 11);
141	ROUND3(b, c, d, a, in[13], 15);
142	ROUND3(a, b, c, d, in[3], 3);
143	ROUND3(d, a, b, c, in[11], 9);
144	ROUND3(c, d, a, b, in[7], 11);
145	ROUND3(b, c, d, a, in[15], 15);
146
147	hash[0] += a;
148	hash[1] += b;
149	hash[2] += c;
150	hash[3] += d;
151}
152
153static inline void md4_transform_helper(struct md4_ctx *ctx)
154{
155	le32_to_cpu_array(ctx->block, sizeof(ctx->block) / sizeof(uint32_t));
156	md4_transform(ctx->hash, ctx->block);
157}
158
159static void md4_init(struct md4_ctx *mctx)
160{
161	mctx->hash[0] = 0x67452301;
162	mctx->hash[1] = 0xefcdab89;
163	mctx->hash[2] = 0x98badcfe;
164	mctx->hash[3] = 0x10325476;
165	mctx->byte_count = 0;
166}
167
168static void md4_update(struct md4_ctx *mctx,
169		       const unsigned char *data, unsigned int len)
170{
171	const uint32_t avail = sizeof(mctx->block) - (mctx->byte_count & 0x3f);
172
173	mctx->byte_count += len;
174
175	if (avail > len) {
176		memcpy((char *)mctx->block + (sizeof(mctx->block) - avail),
177		       data, len);
178		return;
179	}
180
181	memcpy((char *)mctx->block + (sizeof(mctx->block) - avail),
182	       data, avail);
183
184	md4_transform_helper(mctx);
185	data += avail;
186	len -= avail;
187
188	while (len >= sizeof(mctx->block)) {
189		memcpy(mctx->block, data, sizeof(mctx->block));
190		md4_transform_helper(mctx);
191		data += sizeof(mctx->block);
192		len -= sizeof(mctx->block);
193	}
194
195	memcpy(mctx->block, data, len);
196}
197
198static void md4_final_ascii(struct md4_ctx *mctx, char *out, unsigned int len)
199{
200	const unsigned int offset = mctx->byte_count & 0x3f;
201	char *p = (char *)mctx->block + offset;
202	int padding = 56 - (offset + 1);
203
204	*p++ = 0x80;
205	if (padding < 0) {
206		memset(p, 0x00, padding + sizeof (uint64_t));
207		md4_transform_helper(mctx);
208		p = (char *)mctx->block;
209		padding = 56;
210	}
211
212	memset(p, 0, padding);
213	mctx->block[14] = mctx->byte_count << 3;
214	mctx->block[15] = mctx->byte_count >> 29;
215	le32_to_cpu_array(mctx->block, (sizeof(mctx->block) -
216	                  sizeof(uint64_t)) / sizeof(uint32_t));
217	md4_transform(mctx->hash, mctx->block);
218	cpu_to_le32_array(mctx->hash, sizeof(mctx->hash) / sizeof(uint32_t));
219
220	snprintf(out, len, "%08X%08X%08X%08X",
221		 mctx->hash[0], mctx->hash[1], mctx->hash[2], mctx->hash[3]);
222}
223
224static inline void add_char(unsigned char c, struct md4_ctx *md)
225{
226	md4_update(md, &c, 1);
227}
228
229static int parse_string(const char *file, unsigned long len,
230			struct md4_ctx *md)
231{
232	unsigned long i;
233
234	add_char(file[0], md);
235	for (i = 1; i < len; i++) {
236		add_char(file[i], md);
237		if (file[i] == '"' && file[i-1] != '\\')
238			break;
239	}
240	return i;
241}
242
243static int parse_comment(const char *file, unsigned long len)
244{
245	unsigned long i;
246
247	for (i = 2; i < len; i++) {
248		if (file[i-1] == '*' && file[i] == '/')
249			break;
250	}
251	return i;
252}
253
254static int parse_file(const char *fname, struct md4_ctx *md)
255{
256	char *file;
257	unsigned long i, len;
258
259	file = grab_file(fname, &len);
260	if (!file)
261		return 0;
262
263	for (i = 0; i < len; i++) {
264		/* Collapse and ignore \ and CR. */
265		if (file[i] == '\\' && (i+1 < len) && file[i+1] == '\n') {
266			i++;
267			continue;
268		}
269
270		/* Ignore whitespace */
271		if (isspace(file[i]))
272			continue;
273
274		/* Handle strings as whole units */
275		if (file[i] == '"') {
276			i += parse_string(file+i, len - i, md);
277			continue;
278		}
279
280		/* Comments: ignore */
281		if (file[i] == '/' && file[i+1] == '*') {
282			i += parse_comment(file+i, len - i);
283			continue;
284		}
285
286		add_char(file[i], md);
287	}
288	release_file(file, len);
289	return 1;
290}
291
292/* We have dir/file.o.  Open dir/.file.o.cmd, look for deps_ line to
293 * figure out source file. */
294static int parse_source_files(const char *objfile, struct md4_ctx *md)
295{
296	char *cmd, *file, *line, *dir;
297	const char *base;
298	unsigned long flen, pos = 0;
299	int dirlen, ret = 0, check_files = 0;
300
301	cmd = NOFAIL(malloc(strlen(objfile) + sizeof("..cmd")));
302
303	base = strrchr(objfile, '/');
304	if (base) {
305		base++;
306		dirlen = base - objfile;
307		sprintf(cmd, "%.*s.%s.cmd", dirlen, objfile, base);
308	} else {
309		dirlen = 0;
310		sprintf(cmd, ".%s.cmd", objfile);
311	}
312	dir = NOFAIL(malloc(dirlen + 1));
313	strncpy(dir, objfile, dirlen);
314	dir[dirlen] = '\0';
315
316	file = grab_file(cmd, &flen);
317	if (!file) {
318		warn("could not find %s for %s\n", cmd, objfile);
319		goto out;
320	}
321
322	/* There will be a line like so:
323		deps_drivers/net/dummy.o := \
324		  drivers/net/dummy.c \
325		    $(wildcard include/config/net/fastroute.h) \
326		  include/linux/config.h \
327		    $(wildcard include/config/h.h) \
328		  include/linux/module.h \
329
330	   Sum all files in the same dir or subdirs.
331	*/
332	while ((line = get_next_line(&pos, file, flen)) != NULL) {
333		char* p = line;
334		if (strncmp(line, "deps_", sizeof("deps_")-1) == 0) {
335			check_files = 1;
336			continue;
337		}
338		if (!check_files)
339			continue;
340
341		/* Continue until line does not end with '\' */
342		if ( *(p + strlen(p)-1) != '\\')
343			break;
344		/* Terminate line at first space, to get rid of final ' \' */
345		while (*p) {
346                       if (isspace(*p)) {
347				*p = '\0';
348				break;
349			}
350			p++;
351		}
352
353		/* Check if this file is in same dir as objfile */
354		if ((strstr(line, dir)+strlen(dir)-1) == strrchr(line, '/')) {
355			if (!parse_file(line, md)) {
356				warn("could not open %s: %s\n",
357				     line, strerror(errno));
358				goto out_file;
359			}
360
361		}
362
363	}
364
365	/* Everyone parsed OK */
366	ret = 1;
367out_file:
368	release_file(file, flen);
369out:
370	free(dir);
371	free(cmd);
372	return ret;
373}
374
375/* Calc and record src checksum. */
376void get_src_version(const char *modname, char sum[], unsigned sumlen)
377{
378	void *file;
379	unsigned long len;
380	struct md4_ctx md;
381	char *sources, *end, *fname;
382	const char *basename;
383	char filelist[PATH_MAX + 1];
384	char *modverdir = getenv("MODVERDIR");
385
386	if (!modverdir)
387		modverdir = ".";
388
389	/* Source files for module are in .tmp_versions/modname.mod,
390	   after the first line. */
391	if (strrchr(modname, '/'))
392		basename = strrchr(modname, '/') + 1;
393	else
394		basename = modname;
395	sprintf(filelist, "%s/%.*s.mod", modverdir,
396		(int) strlen(basename) - 2, basename);
397
398	file = grab_file(filelist, &len);
399	if (!file)
400		/* not a module or .mod file missing - ignore */
401		return;
402
403	sources = strchr(file, '\n');
404	if (!sources) {
405		warn("malformed versions file for %s\n", modname);
406		goto release;
407	}
408
409	sources++;
410	end = strchr(sources, '\n');
411	if (!end) {
412		warn("bad ending versions file for %s\n", modname);
413		goto release;
414	}
415	*end = '\0';
416
417	md4_init(&md);
418	while ((fname = strsep(&sources, " ")) != NULL) {
419		if (!*fname)
420			continue;
421		if (!parse_source_files(fname, &md))
422			goto release;
423	}
424
425	md4_final_ascii(&md, sum, sumlen);
426release:
427	release_file(file, len);
428}
429
430static void write_version(const char *filename, const char *sum,
431			  unsigned long offset)
432{
433	int fd;
434
435	fd = open(filename, O_RDWR);
436	if (fd < 0) {
437		warn("changing sum in %s failed: %s\n",
438			filename, strerror(errno));
439		return;
440	}
441
442	if (lseek(fd, offset, SEEK_SET) == (off_t)-1) {
443		warn("changing sum in %s:%lu failed: %s\n",
444			filename, offset, strerror(errno));
445		goto out;
446	}
447
448	if (write(fd, sum, strlen(sum)+1) != strlen(sum)+1) {
449		warn("writing sum in %s failed: %s\n",
450			filename, strerror(errno));
451		goto out;
452	}
453out:
454	close(fd);
455}
456
457static int strip_rcs_crap(char *version)
458{
459	unsigned int len, full_len;
460
461	if (strncmp(version, "$Revision", strlen("$Revision")) != 0)
462		return 0;
463
464	/* Space for version string follows. */
465	full_len = strlen(version) + strlen(version + strlen(version) + 1) + 2;
466
467	/* Move string to start with version number: prefix will be
468	 * $Revision: 1.1.1.1 $ or $Revision: */
469	len = strlen("$Revision");
470	if (version[len] == ':' || version[len] == '$')
471		len++;
472	while (isspace(version[len]))
473		len++;
474	memmove(version, version+len, full_len-len);
475	full_len -= len;
476
477	/* Preserve up to next whitespace. */
478	len = 0;
479	while (version[len] && !isspace(version[len]))
480		len++;
481	memmove(version + len, version + strlen(version),
482		full_len - strlen(version));
483	return 1;
484}
485
486/* Clean up RCS-style version numbers. */
487void maybe_frob_rcs_version(const char *modfilename,
488			    char *version,
489			    void *modinfo,
490			    unsigned long version_offset)
491{
492	if (strip_rcs_crap(version))
493		write_version(modfilename, version, version_offset);
494}
495