Adding upstream version 1:2.3.19.1+dfsg1.upstream/1%2.3.19.1+dfsg1upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 147 insertions, 0 deletions

diff --git a/src/auth/password-scheme-md5crypt.c b/src/auth/password-scheme-md5crypt.c
new file mode 100644
index 0000000..a75e3b2
--- /dev/null
+++ b/src/auth/password-scheme-md5crypt.c
@@ -0,0 +1,147 @@
+/*
+ * ----------------------------------------------------------------------------
+ * "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
+ * ----------------------------------------------------------------------------
+ */
+
+/*
+ * Ported from FreeBSD to Linux, only minimal changes.  --marekm
+ */
+
+/*
+ * Adapted from shadow-19990607 by Tudor Bosman, tudorb@jm.nu
+ */
+
+#include "lib.h"
+#include "safe-memset.h"
+#include "str.h"
+#include "md5.h"
+#include "password-scheme.h"
+
+static unsigned char itoa64[] =		/* 0 ... 63 => ascii - 64 */
+	"./0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
+
+static char	magic[] = "$1$";	/*
+				 * This string is magic for
+				 * this algorithm.  Having
+				 * it this way, we can get
+				 * get better later on
+				 */
+
+static void
+to64(string_t *str, unsigned long v, int n)
+{
+	while (--n >= 0) {
+		str_append_c(str, itoa64[v&0x3f]);
+		v >>= 6;
+	}
+}
+
+/*
+ * UNIX password
+ *
+ * Use MD5 for what it is best at...
+ */
+
+const char *password_generate_md5_crypt(const char *pw, const char *salt)
+{
+	const char *sp,*ep;
+	unsigned char	final[MD5_RESULTLEN];
+	int sl,pl,i,j;
+	struct md5_context ctx,ctx1;
+	unsigned long l;
+	string_t *passwd;
+	size_t pw_len = strlen(pw);
+
+	/* Refine the Salt first */
+	sp = salt;
+
+	/* If it starts with the magic string, then skip that */
+	if (strncmp(sp, magic, sizeof(magic)-1) == 0)
+		sp += sizeof(magic)-1;
+
+	/* It stops at the first '$', max 8 chars */
+	for(ep=sp;*ep != '\0' && *ep != '$' && ep < (sp+8);ep++)
+		continue;
+
+	/* get the length of the true salt */
+	sl = ep - sp;
+
+	md5_init(&ctx);
+
+	/* The password first, since that is what is most unknown */
+	md5_update(&ctx,pw,pw_len);
+
+	/* Then our magic string */
+	md5_update(&ctx,magic,sizeof(magic)-1);
+
+	/* Then the raw salt */
+	md5_update(&ctx,sp,sl);
+
+	/* Then just as many characters of the MD5(pw,salt,pw) */
+	md5_init(&ctx1);
+	md5_update(&ctx1,pw,pw_len);
+	md5_update(&ctx1,sp,sl);
+	md5_update(&ctx1,pw,pw_len);
+	md5_final(&ctx1,final);
+	for(pl = pw_len; pl > 0; pl -= MD5_RESULTLEN)
+		md5_update(&ctx,final,pl>MD5_RESULTLEN ? MD5_RESULTLEN : pl);
+
+	/* Don't leave anything around in vm they could use. */
+	safe_memset(final, 0, sizeof(final));
+
+	/* Then something really weird... */
+	for (j=0,i = pw_len; i != 0; i >>= 1)
+		if ((i&1) != 0)
+		    md5_update(&ctx, final+j, 1);
+		else
+		    md5_update(&ctx, pw+j, 1);
+
+	/* Now make the output string */
+	passwd = t_str_new(sl + 64);
+	str_append(passwd, magic);
+	str_append_data(passwd, sp, sl);
+	str_append_c(passwd, '$');
+
+	md5_final(&ctx,final);
+
+	/*
+	 * 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++) {
+		md5_init(&ctx1);
+		if((i & 1) != 0)
+			md5_update(&ctx1,pw,pw_len);
+		else
+			md5_update(&ctx1,final,MD5_RESULTLEN);
+
+		if((i % 3) != 0)
+			md5_update(&ctx1,sp,sl);
+
+		if((i % 7) != 0)
+			md5_update(&ctx1,pw,pw_len);
+
+		if((i & 1) != 0)
+			md5_update(&ctx1,final,MD5_RESULTLEN);
+		else
+			md5_update(&ctx1,pw,pw_len);
+		md5_final(&ctx1,final);
+	}
+
+	l = (final[ 0]<<16) | (final[ 6]<<8) | final[12]; to64(passwd,l,4);
+	l = (final[ 1]<<16) | (final[ 7]<<8) | final[13]; to64(passwd,l,4);
+	l = (final[ 2]<<16) | (final[ 8]<<8) | final[14]; to64(passwd,l,4);
+	l = (final[ 3]<<16) | (final[ 9]<<8) | final[15]; to64(passwd,l,4);
+	l = (final[ 4]<<16) | (final[10]<<8) | final[ 5]; to64(passwd,l,4);
+	l =                    final[11]                ; to64(passwd,l,2);
+
+	/* Don't leave anything around in vm they could use. */
+	safe_memset(final, 0, sizeof(final));
+
+	return str_c(passwd);
+}