From d4a8b7e34dd619a4debf9a206c81db26d1402ea6 Mon Sep 17 00:00:00 2001
From: Damien Miller <djm@mindrot.org>
Date: Wed, 27 Oct 1999 13:42:43 +1000
Subject: Initial revision

---
 auth-skey.c | 149 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 149 insertions(+)
 create mode 100644 auth-skey.c

(limited to 'auth-skey.c')

diff --git a/auth-skey.c b/auth-skey.c
new file mode 100644
index 000000000..9ec170494
--- /dev/null
+++ b/auth-skey.c
@@ -0,0 +1,149 @@
+#include "includes.h"
+RCSID("$Id: auth-skey.c,v 1.2 1999/10/16 20:57:52 deraadt Exp $");
+
+#include "ssh.h"
+#include <sha1.h>
+
+/* from %OpenBSD: skeylogin.c,v 1.32 1999/08/16 14:46:56 millert Exp % */
+
+
+#define ROUND(x)   (((x)[0] << 24) + (((x)[1]) << 16) + (((x)[2]) << 8) + \
+		    ((x)[3]))
+
+/*
+ * hash_collapse()
+ */
+static u_int32_t
+hash_collapse(s)
+        u_char *s;
+{
+        int len, target;
+	u_int32_t i;
+	
+	if ((strlen(s) % sizeof(u_int32_t)) == 0)
+  		target = strlen(s);    /* Multiple of 4 */
+	else
+		target = strlen(s) - (strlen(s) % sizeof(u_int32_t));
+  
+	for (i = 0, len = 0; len < target; len += 4)
+        	i ^= ROUND(s + len);
+
+	return i;
+}
+char *
+skey_fake_keyinfo(char *username)
+{
+	int i;
+	u_int ptr;
+	u_char hseed[SKEY_MAX_SEED_LEN], flg = 1, *up;
+	char pbuf[SKEY_MAX_PW_LEN+1];
+	static char skeyprompt[SKEY_MAX_CHALLENGE+1];
+	char *secret = NULL;
+	size_t secretlen = 0;
+	SHA1_CTX ctx;
+	char *p, *u;
+
+	/*
+	 * Base first 4 chars of seed on hostname.
+	 * Add some filler for short hostnames if necessary.
+	 */
+	if (gethostname(pbuf, sizeof(pbuf)) == -1)
+		*(p = pbuf) = '.';
+	else
+		for (p = pbuf; *p && isalnum(*p); p++)
+			if (isalpha(*p) && isupper(*p))
+				*p = tolower(*p);
+	if (*p && pbuf - p < 4)
+		(void)strncpy(p, "asjd", 4 - (pbuf - p));
+	pbuf[4] = '\0';
+
+	/* Hash the username if possible */
+	if ((up = SHA1Data(username, strlen(username), NULL)) != NULL) {
+		struct stat sb;
+		time_t t;
+		int fd;
+
+		/* Collapse the hash */
+		ptr = hash_collapse(up);
+		memset(up, 0, strlen(up));
+
+		/* See if the random file's there, else use ctime */
+		if ((fd = open(_SKEY_RAND_FILE_PATH_, O_RDONLY)) != -1
+		    && fstat(fd, &sb) == 0 &&
+		    sb.st_size > (off_t)SKEY_MAX_SEED_LEN &&
+		    lseek(fd, ptr % (sb.st_size - SKEY_MAX_SEED_LEN),
+		    SEEK_SET) != -1 && read(fd, hseed,
+		    SKEY_MAX_SEED_LEN) == SKEY_MAX_SEED_LEN) {
+			close(fd);
+			secret = hseed;
+			secretlen = SKEY_MAX_SEED_LEN;
+			flg = 0;
+		} else if (!stat(_PATH_MEM, &sb) || !stat("/", &sb)) {
+			t = sb.st_ctime;
+			secret = ctime(&t);
+			secretlen = strlen(secret);
+			flg = 0;
+		}
+	}
+
+	/* Put that in your pipe and smoke it */
+	if (flg == 0) {
+		/* Hash secret value with username */
+		SHA1Init(&ctx);
+		SHA1Update(&ctx, secret, secretlen);
+		SHA1Update(&ctx, username, strlen(username));
+		SHA1End(&ctx, up);
+		
+		/* Zero out */
+		memset(secret, 0, secretlen);
+
+		/* Now hash the hash */
+		SHA1Init(&ctx);
+		SHA1Update(&ctx, up, strlen(up));
+		SHA1End(&ctx, up);
+		
+		ptr = hash_collapse(up + 4);
+		
+		for (i = 4; i < 9; i++) {
+			pbuf[i] = (ptr % 10) + '0';
+			ptr /= 10;
+		}
+		pbuf[i] = '\0';
+
+		/* Sequence number */
+		ptr = ((up[2] + up[3]) % 99) + 1;
+
+		memset(up, 0, 20); /* SHA1 specific */
+		free(up);
+
+		(void)snprintf(skeyprompt, sizeof skeyprompt,
+			      "otp-%.*s %d %.*s",
+			      SKEY_MAX_HASHNAME_LEN,
+			      skey_get_algorithm(),
+			      ptr, SKEY_MAX_SEED_LEN,
+			      pbuf);
+	} else {
+		/* Base last 8 chars of seed on username */
+		u = username;
+		i = 8;
+		p = &pbuf[4];
+		do {
+			if (*u == 0) {
+				/* Pad remainder with zeros */
+				while (--i >= 0)
+					*p++ = '0';
+				break;
+			}
+
+			*p++ = (*u++ % 10) + '0';
+		} while (--i != 0);
+		pbuf[12] = '\0';
+
+		(void)snprintf(skeyprompt, sizeof skeyprompt,
+			      "otp-%.*s %d %.*s",
+			      SKEY_MAX_HASHNAME_LEN,
+			      skey_get_algorithm(),
+			      99, SKEY_MAX_SEED_LEN, pbuf);
+	}
+	return skeyprompt;
+}
-- 
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