Initial revision

1 files changed, 149 insertions, 0 deletions

diff --git a/modules/pam_unix/md5_crypt.c b/modules/pam_unix/md5_crypt.c
new file mode 100644
index 00000000..a7243a2e
--- /dev/null
+++ b/modules/pam_unix/md5_crypt.c
@@ -0,0 +1,149 @@
+/*
+ * $Id$
+ *
+ * ----------------------------------------------------------------------------
+ * "THE BEER-WARE LICENSE" (Revision 42):
+ * <phk@login.dknet.dk> wrote this file.  As long as you retain this notice you
+ * can do whatever you want with this stuff. If we meet some day, and you think
+ * this stuff is worth it, you can buy me a beer in return.   Poul-Henning Kamp
+ * ----------------------------------------------------------------------------
+ *
+ * Origin: Id: crypt.c,v 1.3 1995/05/30 05:42:22 rgrimes Exp
+ *
+ */
+
+#include <string.h>
+#include "md5.h"
+
+static unsigned char itoa64[] =	/* 0 ... 63 => ascii - 64 */
+"./0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
+
+static void to64(char *s, unsigned long v, int n)
+{
+	while (--n >= 0) {
+		*s++ = itoa64[v & 0x3f];
+		v >>= 6;
+	}
+}
+
+/*
+ * UNIX password
+ *
+ * Use MD5 for what it is best at...
+ */
+
+char *MD5Name(crypt_md5)(const char *pw, const char *salt)
+{
+	const char *magic = "$1$";
+	/* This string is magic for this algorithm.  Having
+	 * it this way, we can get get better later on */
+	static char passwd[120], *p;
+	static const char *sp, *ep;
+	unsigned char final[16];
+	int sl, pl, i, j;
+	MD5_CTX ctx, ctx1;
+	unsigned long l;
+
+	/* Refine the Salt first */
+	sp = salt;
+
+	/* If it starts with the magic string, then skip that */
+	if (!strncmp(sp, magic, strlen(magic)))
+		sp += strlen(magic);
+
+	/* It stops at the first '$', max 8 chars */
+	for (ep = sp; *ep && *ep != '$' && ep < (sp + 8); ep++)
+		continue;
+
+	/* get the length of the true salt */
+	sl = ep - sp;
+
+	MD5Name(MD5Init)(&ctx);
+
+	/* The password first, since that is what is most unknown */
+	MD5Name(MD5Update)(&ctx,(unsigned const char *)pw,strlen(pw));
+
+	/* Then our magic string */
+	MD5Name(MD5Update)(&ctx,(unsigned const char *)magic,strlen(magic));
+
+	/* Then the raw salt */
+	MD5Name(MD5Update)(&ctx,(unsigned const char *)sp,sl);
+
+	/* Then just as many characters of the MD5(pw,salt,pw) */
+	MD5Name(MD5Init)(&ctx1);
+	MD5Name(MD5Update)(&ctx1,(unsigned const char *)pw,strlen(pw));
+	MD5Name(MD5Update)(&ctx1,(unsigned const char *)sp,sl);
+	MD5Name(MD5Update)(&ctx1,(unsigned const char *)pw,strlen(pw));
+	MD5Name(MD5Final)(final,&ctx1);
+	for (pl = strlen(pw); pl > 0; pl -= 16)
+		MD5Name(MD5Update)(&ctx,(unsigned const char *)final,pl>16 ? 16 : pl);
+
+	/* Don't leave anything around in vm they could use. */
+	memset(final, 0, sizeof final);
+
+	/* Then something really weird... */
+	for (j = 0, i = strlen(pw); i; i >>= 1)
+		if (i & 1)
+			MD5Name(MD5Update)(&ctx, (unsigned const char *)final+j, 1);
+		else
+			MD5Name(MD5Update)(&ctx, (unsigned const char *)pw+j, 1);
+
+	/* Now make the output string */
+	strcpy(passwd, magic);
+	strncat(passwd, sp, sl);
+	strcat(passwd, "$");
+
+	MD5Name(MD5Final)(final,&ctx);
+
+	/*
+	 * and now, just to make sure things don't run too fast
+	 * On a 60 Mhz Pentium this takes 34 msec, so you would
+	 * need 30 seconds to build a 1000 entry dictionary...
+	 */
+	for (i = 0; i < 1000; i++) {
+		MD5Name(MD5Init)(&ctx1);
+		if (i & 1)
+			MD5Name(MD5Update)(&ctx1,(unsigned const char *)pw,strlen(pw));
+		else
+			MD5Name(MD5Update)(&ctx1,(unsigned const char *)final,16);
+
+		if (i % 3)
+			MD5Name(MD5Update)(&ctx1,(unsigned const char *)sp,sl);
+
+		if (i % 7)
+			MD5Name(MD5Update)(&ctx1,(unsigned const char *)pw,strlen(pw));
+
+		if (i & 1)
+			MD5Name(MD5Update)(&ctx1,(unsigned const char *)final,16);
+		else
+			MD5Name(MD5Update)(&ctx1,(unsigned const char *)pw,strlen(pw));
+		MD5Name(MD5Final)(final,&ctx1);
+	}
+
+	p = passwd + strlen(passwd);
+
+	l = (final[0] << 16) | (final[6] << 8) | final[12];
+	to64(p, l, 4);
+	p += 4;
+	l = (final[1] << 16) | (final[7] << 8) | final[13];
+	to64(p, l, 4);
+	p += 4;
+	l = (final[2] << 16) | (final[8] << 8) | final[14];
+	to64(p, l, 4);
+	p += 4;
+	l = (final[3] << 16) | (final[9] << 8) | final[15];
+	to64(p, l, 4);
+	p += 4;
+	l = (final[4] << 16) | (final[10] << 8) | final[5];
+	to64(p, l, 4);
+	p += 4;
+	l = final[11];
+	to64(p, l, 2);
+	p += 2;
+	*p = '\0';
+
+	/* Don't leave anything around in vm they could use. */
+	memset(final, 0, sizeof final);
+
+	return passwd;
+}