1) Added s/key support .

2  Added optional excessive login logging.
3) Added login acces control on a per host/tty base.
4) See skey(1) for skey descriptions and src/usr.bin/login/README
  for the logging and access control features.

-Guido

1 files changed, 328 insertions, 0 deletions

diff --git a/lib/libskey/skeylogin.c b/lib/libskey/skeylogin.c
new file mode 100644
index 000000000000..bc49cb715231
--- /dev/null
+++ b/lib/libskey/skeylogin.c
@@ -0,0 +1,328 @@
+/*   Login code for S/KEY Authentication.  S/KEY is a trademark
+ *   of Bellcore.
+ *
+ *   Mink is the former name of the S/KEY authentication system.
+ *   Many references for mink  may still be found in this program.   */
+
+#include <sys/param.h>
+#ifdef	QUOTA
+#include <sys/quota.h>
+#endif
+#include <sys/stat.h>
+#include <sys/time.h>
+#include <sys/resource.h>
+
+ 
+#include <stdio.h>
+#include <string.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <time.h>
+#include <errno.h>
+#include "skey.h"
+
+#define	KEYFILE	"/etc/skeykeys"
+
+char *skipspace();
+int skeylookup __ARGS((struct skey *mp,char *name));
+
+#define setpriority(x,y,z)	/* nothing */
+
+/* Issue a skey challenge for user 'name'. If successful,
+ * fill in the caller's skey structure and return 0. If unsuccessful
+ * (e.g., if name is unknown) return -1.
+ *
+ * The file read/write pointer is left at the start of the
+ * record.
+ */
+int
+getskeyprompt(mp,name,prompt)
+struct skey *mp;
+char *name;
+char *prompt;
+{
+	int rval;
+
+	sevenbit(name);
+	rval = skeylookup(mp,name);
+	strcpy(prompt,"s/key 55 latour1\n");
+	switch(rval){
+	case -1:	/* File error */
+		return -1;
+	case 0:		/* Lookup succeeded, return challenge */
+		sprintf(prompt,"s/key %d %s\n",mp->n - 1,mp->seed);
+		return 0;
+	case 1:		/* User not found */
+		fclose(mp->keyfile);
+		return -1;
+	}
+	return -1;	/* Can't happen */
+}	
+/* Return  a skey challenge string for user 'name'. If successful,
+ * fill in the caller's skey structure and return 0. If unsuccessful
+ * (e.g., if name is unknown) return -1.
+ *
+ * The file read/write pointer is left at the start of the
+ * record.
+ */
+int
+skeychallenge(mp,name, ss)
+struct skey *mp;
+char *name;
+char *ss;
+{
+	int rval;
+
+	rval = skeylookup(mp,name);
+	switch(rval){
+	case -1:	/* File error */
+		return -1;
+	case 0:		/* Lookup succeeded, issue challenge */
+                sprintf(ss, "s/key %d %s",mp->n - 1,mp->seed);
+		return 0;
+	case 1:		/* User not found */
+		fclose(mp->keyfile);
+		return -1;
+	}
+	return -1;	/* Can't happen */
+}	
+
+/* Find an entry in the One-time Password database.
+ * Return codes:
+ * -1: error in opening database
+ *  0: entry found, file R/W pointer positioned at beginning of record
+ *  1: entry not found, file R/W pointer positioned at EOF
+ */
+int
+skeylookup(mp,name)
+struct skey *mp;
+char *name;
+{
+	int found;
+	int len;
+	long recstart;
+	char *cp;
+	struct stat statbuf;
+
+	/* See if the KEYFILE exists, and create it if not */
+	if(stat(KEYFILE,&statbuf) == -1 && errno == ENOENT){
+		mp->keyfile = fopen(KEYFILE,"w+");
+		(void) chmod(KEYFILE, 0644);
+	} else {
+		/* Otherwise open normally for update */
+		mp->keyfile = fopen(KEYFILE,"r+");
+	}
+	if(mp->keyfile == NULL)
+		return -1;
+
+	/* Look up user name in database */
+	len = strlen(name);
+	if( len > 8 ) len = 8;		/*  Added 8/2/91  -  nmh */
+	found = 0;
+	while(!feof(mp->keyfile)){
+		recstart = ftell(mp->keyfile);
+		mp->recstart = recstart;
+		if(fgets(mp->buf,sizeof(mp->buf),mp->keyfile) != mp->buf){
+			break;
+		}
+		rip(mp->buf);
+		if(mp->buf[0] == '#')
+			continue;	/* Comment */
+		if((mp->logname = strtok(mp->buf," \t")) == NULL)
+			continue;
+		if((cp = strtok(NULL," \t")) == NULL)
+			continue;
+		mp->n = atoi(cp);
+		if((mp->seed = strtok(NULL," \t")) == NULL)
+			continue;
+		if((mp->val = strtok(NULL," \t")) == NULL)
+			continue;
+		if(strlen(mp->logname) == len
+		 && strncmp(mp->logname,name,len) == 0){
+			found = 1;
+			break;
+		}
+	}
+	if(found){
+		fseek(mp->keyfile,recstart,0);
+		return 0;
+	} else
+		return 1;
+}
+/* Verify response to a s/key challenge.
+ *
+ * Return codes:
+ * -1: Error of some sort; database unchanged
+ *  0:  Verify successful, database updated
+ *  1:  Verify failed, database unchanged
+ *
+ * The database file is always closed by this call.
+ */
+int
+skeyverify(mp,response)
+struct skey *mp;
+char *response;
+{
+ struct timeval startval;
+ struct timeval endval;
+long microsec;
+	char key[8];
+	char fkey[8];
+	char filekey[8];
+	time_t now;
+	struct tm *tm;
+	char tbuf[27],buf[60];
+	char me[80];
+	int rval;
+	char *cp;
+
+	time(&now);
+	tm = localtime(&now);
+	strftime(tbuf, sizeof(tbuf), " %b %d,%Y %T", tm);
+
+	if(response == NULL){
+		fclose(mp->keyfile);
+		return -1;
+	}
+	rip(response);
+
+	/* Convert response to binary */
+	if(etob(key,response) != 1 && atob8(key,response) != 0){
+		/* Neither english words or ascii hex */
+		fclose(mp->keyfile);
+		return -1;
+	}
+
+	/* Compute fkey = f(key) */
+	memcpy(fkey,key,sizeof(key));
+	f(fkey);
+	/* in order to make the window of update as short as possible
+           we must do the comparison here and if OK write it back
+           other wise the same password can be used twice to get in
+  	   to the system
+	*/
+
+	setpriority(PRIO_PROCESS, 0, -4);
+/*
+  gettimeofday(&startval, (char *)0 );
+*/
+
+	/* reread the file record NOW*/
+
+	fseek(mp->keyfile,mp->recstart,0);
+	if(fgets(mp->buf,sizeof(mp->buf),mp->keyfile) != mp->buf){
+		setpriority(PRIO_PROCESS, 0, 0);
+		fclose(mp->keyfile);
+		return -1;
+	}
+	rip(mp->buf);
+	mp->logname = strtok(mp->buf," \t");
+	cp = strtok(NULL," \t") ;
+	mp->seed = strtok(NULL," \t");
+	mp->val = strtok(NULL," \t");
+	/* And convert file value to hex for comparison */
+	atob8(filekey,mp->val);
+
+	/* Do actual comparison */
+	if(memcmp(filekey,fkey,8) != 0){
+		/* Wrong response */
+		setpriority(PRIO_PROCESS, 0, 0);
+		fclose(mp->keyfile);
+		return 1;
+	}
+
+	/* Update key in database by overwriting entire record. Note
+	 * that we must write exactly the same number of bytes as in
+	 * the original record (note fixed width field for N)
+	 */
+	btoa8(mp->val,key);
+	mp->n--;
+	fseek(mp->keyfile,mp->recstart,0);
+	fprintf(mp->keyfile,"%s %04d %-16s %s %-21s\n",mp->logname,mp->n,mp->seed,
+	 mp->val, tbuf);
+/*
+gettimeofday(&endval, (char *)0 );
+ microsec = (endval.tv_sec - startval.tv_sec) * 1000000 + (endval.tv_usec - startval.tv_usec);
+fprintf(stderr, "window= %d micro seconds \n"  , microsec);
+*/
+
+
+	fclose(mp->keyfile);
+	
+	setpriority(PRIO_PROCESS, 0, 0);
+	return 0;
+}
+
+
+/* Convert 8-byte hex-ascii string to binary array
+ * Returns 0 on success, -1 on error
+ */
+atob8(out,in)
+register char *out,*in;
+{
+	register int i;
+	register int val;
+
+	if(in == NULL || out == NULL)
+		return -1;
+
+	for(i=0;i<8;i++){
+		if((in = skipspace(in)) == NULL)
+			return -1;
+		if((val = htoi(*in++)) == -1)
+			return -1;
+		*out = val << 4;
+
+		if((in = skipspace(in)) == NULL)
+			return -1;
+		if((val = htoi(*in++)) == -1)
+			return -1;
+		*out++ |= val;
+	}
+	return 0;
+}
+
+char *
+skipspace(cp)
+register char *cp;
+{
+	while(*cp == ' ' || *cp == '\t')
+		cp++;
+
+	if(*cp == '\0')
+		return NULL;
+	else
+		return cp;
+}
+
+/* Convert 8-byte binary array to hex-ascii string */
+int
+btoa8(out,in)
+register char *out,*in;
+{
+	register int i;
+
+	if(in == NULL || out == NULL)
+		return -1;
+
+	for(i=0;i<8;i++){
+		sprintf(out,"%02x",*in++ & 0xff);
+		out += 2;
+	}
+	return 0;
+}
+
+
+/* Convert hex digit to binary integer */
+int
+htoi(c)
+register char c;
+{
+	if('0' <= c && c <= '9')
+		return c - '0';
+	if('a' <= c && c <= 'f')
+		return 10 + c - 'a';
+	if('A' <= c && c <= 'F')
+		return 10 + c - 'A';
+	return -1;
+}