From 1ad6ccc98afd1c55203d6b83b4d8e79fa7b3847a Mon Sep 17 00:00:00 2001
From: davidn <davidn@FreeBSD.org>
Date: Sat, 10 May 1997 18:55:38 +0000
Subject: Summary of login.conf support changes:

o Incorporated BSDI code and enhancements, better logging for error
  checking (which has been shown to be a problem, and is therefore
  justified, imho); also some minor things we were missing, including
  better quad_t math, which checks for under/overflows.

o setusercontext() now allows user resource limit overrides, but
  does this AFTER dropping root privs, to restrict the user to
  droping hard limits and set soft limits within the kernel's
  allowed user limits.

o umask() only set once, and only if requested.

o add _secure_path(), and use in login.conf to guard against
  symlinks etc. and non-root owned or non-user owned files being
  used. Derived from BSDI contributed code.

o revamped authentication code to BSDI's latest api, which
  includes deleting authenticate() and adding auth_check()
  and a few other functions. This is still marked as depecated
  in BSDI, but is included for completeness. No other source
  in the tree uses this anyway, so it is now bracketed with
  #ifdef LOGIN_CAP_AUTH which is by default not defined. Only
  auth_checknologin() and auth_cat() are actually used in
  module login_auth.c.

o AUTH_NONE definition removed (collided with other includes
  in the tree). [bde]

o BSDI's login_getclass() now accepts a char *classname
  parameter rather than struct passwd *pwd. We now do likewise,
  but added login_getpwclass() for (sort of) backwards
  compatiblity, namely because we handle root as a special
  case for the default class. This will require quite a few
  changes elsewhere in the source tree.

o We no longer pretend to support rlim_t as a long type.

o Revised code formatting to be more bsd-ish style.
---
 lib/libutil/login_auth.c | 715 +++++++++++++++++++++++++++++++++--------------
 1 file changed, 500 insertions(+), 215 deletions(-)

(limited to 'lib/libutil/login_auth.c')

diff --git a/lib/libutil/login_auth.c b/lib/libutil/login_auth.c
index 565ddc3..695b006 100644
--- a/lib/libutil/login_auth.c
+++ b/lib/libutil/login_auth.c
@@ -4,6 +4,10 @@
  * David Nugent <davidn@blaze.net.au>
  * All rights reserved.
  *
+ * Portions copyright (c) 1995,1997 by
+ * Berkeley Software Design, Inc.
+ * All rights reserved.
+ *
  * Redistribution and use in source and binary forms, with or without
  * modification, is permitted provided that the following conditions
  * are met:
@@ -21,17 +25,19 @@
  *
  * Low-level routines relating to the user capabilities database
  *
- *	$Id$
+ *	$Id: login_auth.c,v 1.6 1997/02/22 15:08:18 peter Exp $
  */
 
 #include <sys/types.h>
 #include <sys/time.h>
 #include <sys/resource.h>
 #include <sys/stat.h>
+#include <sys/param.h>
 #include <errno.h>
 #include <fcntl.h>
 #include <limits.h>
 #include <stdio.h>
+#include <ctype.h>
 #include <pwd.h>
 #include <stdlib.h>
 #include <string.h>
@@ -40,297 +46,575 @@
 #include <login_cap.h>
 #include <stdarg.h>
 #include <paths.h>
+#include <sys/socket.h>
 #include <sys/wait.h>
+#include <err.h>
+#include <libutil.h>
+
+#ifdef	LOGIN_CAP_AUTH
+/*
+ * Comment from BSDI's authenticate.c module:
+ * NOTE: THIS MODULE IS TO BE DEPRECATED.  FUTURE VERSIONS OF BSD/OS WILL
+ * HAVE AN UPDATED API, THOUGH THESE FUNCTIONS WILL CONTINUE TO BE AVAILABLE
+ * FOR BACKWARDS COMPATABILITY
+ */
 
-#ifdef RLIM_LONG
-# define STRTOV strtol
-#else
-# define STRTOV strtoq
-#endif
 
-#define AUTHMAXLINES  1024
-#define AUTHMAXARGS   16
+#define AUTHMAXSPOOL	(8 * 1024) /* Max size of authentication data */
+#define	AUTHCOMM_FD	3	   /* Handle used to read/write auth data */
+
+struct rmfiles {
+    struct rmfiles  *next;
+    char	    file[1];
+};
 
-struct auth_info {
-  int reject;
-  int auths;
-  int env_count;
-  char **env;
-  int file_count;
-  char **files;
+struct authopts {
+    struct authopts *next;
+    char	    opt[1];
 };
 
-static struct auth_info auth_info;
+static char *spoolbuf = NULL;
+static int spoolidx = 0;
+static struct rmfiles *rmfirst = NULL;
+static struct authopts *optfirst = NULL;
+
 
 /*
- * free_auth_info()
- * Go through the auth_info structure, and free() anything of interest.
- * This includes the string arrays, and any individual element.
- * All part of being environmentally conscious ;).
+ * Setup a known environment for all authentication scripts.
  */
 
-static void
-free_auth_info(void)
+static char *auth_environ[] = {
+    "PATH=" _PATH_DEFPATH,
+    "SHELL=" _PATH_BSHELL,
+    NULL,
+};
+
+
+
+/*
+ * nextline()
+ * Get the next line from the data buffer collected from
+ * the authentication program. This function relies on the
+ * fact that lines are nul terminated.
+ */
+
+static char *
+nextline(int *idx)
 {
-  int i;
-
-  auth_info.reject = 0;
-  auth_info.auths = 0;
-  if (auth_info.env) {
-    for (i = 0; i < auth_info.env_count; i++) {
-      if (auth_info.env[i])
-	free(auth_info.env[i]);
-    }
-    free(auth_info.env);
-    auth_info.env = NULL;
-  }
-  if (auth_info.files) {
-    for (i = 0; i < auth_info.file_count; i++) {
-      if (auth_info.files[i])
-	free(auth_info.files[i]);
+    char    *ptr = NULL;
+
+    if (spoolbuf != NULL && *idx < spoolidx) {
+	ptr = spoolbuf + *idx;
+	*idx += strlen(ptr) + 1;
     }
-    free(auth_info.files);
-    auth_info.files = NULL;
-  }
+    return ptr;
 }
 
 
 /*
- * collect_info()
- * Read from <fd>, a list of authorization commands.
- * These commands are:
- *	reject
- *	authorize [root|secure]
- *	setenv <name>[ <value>]
- *	remove <file>
- * A single reject means the entire thing is bad;
- * multiple authorize statements can be present (it would be
- * silly, but that's what the spec says).
- * The commands are collected, and are accted upon by:
- *	auth_scan()	-- check for authorization or rejection
- *	auth_rmfiles()	-- remove the specified files
- *	auth_env()	-- set the specified environment variables
- * We only get up to AUTHMAXLINES lines of input from the program.
+ * spooldata()
+ * Read data returned on authentication backchannel and
+ * stuff it into our spool buffer. We also replace \n with nul
+ * to make parsing easier later.
  */
-#define STRSIZEOF(x)  (sizeof(x)-1)
-static void
-collect_info(int fd)
+
+static int
+spooldata(int fd)
 {
-  char *line;
-  FILE *fp;
-  char *ptr;
-  size_t len;
-  int line_count = 0;
-
-  fp = fdopen(fd, "r");
-
-  while ((line = fgetln(fp, &len)) != NULL) {
-    if (++line_count > AUTHMAXLINES)
-      break;
-    if (len && line[len-1] == '\n')
-      --len;
-    line[len] = '\0'; /* Terminate */
-    if (strncasecmp(line, BI_REJECT, STRSIZEOF(BI_REJECT)) == 0) {
-      auth_info.reject = 1;
-    } else if (strncasecmp(line, BI_AUTH, STRSIZEOF(BI_AUTH)) == 0) {
-      ptr = line + STRSIZEOF(BI_AUTH);
-      ptr += strspn(ptr, " \t");
-      if (!*ptr)
-	auth_info.auths |= AUTH_OKAY;
-      else if (strncasecmp(ptr, BI_ROOTOKAY, STRSIZEOF(BI_ROOTOKAY)) == 0)
-	auth_info.auths |= AUTH_ROOTOKAY;
-      else if (strncasecmp(ptr, BI_SECURE, STRSIZEOF(BI_SECURE)) == 0)
-	auth_info.auths |= AUTH_SECURE;
-    } else if (strncasecmp(line, BI_SETENV, STRSIZEOF(BI_SETENV)) == 0) {
-      ptr = line + STRSIZEOF(BI_SETENV);
-      ptr += strspn(ptr, " \t");
-      if (*ptr) {
-	char **tmp = realloc(auth_info.env, sizeof(char*) * (auth_info.env_count + 1));
-	if (tmp != NULL) {
-	  auth_info.env = tmp;
-	  if ((auth_info.env[auth_info.env_count] = strdup(ptr)) != NULL)
-	    auth_info.env_count++;
-	}
-      }
-    } else if (strncasecmp(line, BI_REMOVE, STRSIZEOF(BI_REMOVE)) == 0) {
-      ptr = line + STRSIZEOF(BI_REMOVE);
-      ptr += strspn(ptr, " \t");
-      if (*ptr) {
-	char **tmp = realloc(auth_info.files, sizeof(char*) * (auth_info.file_count + 1));
-	if (tmp != NULL) {
-	  auth_info.files = tmp;
-	  if ((auth_info.files[auth_info.file_count] = strdup(ptr)) != NULL)
-	    auth_info.file_count++;
+
+    if (spoolbuf)
+	free(spoolbuf);
+    spoolidx = 0;
+
+    if (spoolbuf == NULL && (spoolbuf = malloc(AUTHMAXSPOOL)) == NULL)
+	syslog(LOG_ERR, "authbuffer malloc: %m");
+
+    else while (spoolidx < sizeof(spoolbuf) - 1) {
+	int	r = read(fd, spoolbuf + spoolidx, sizeof(spoolbuf)-spoolidx);
+	char	*b;
+
+	if (r <= 0) {
+	    spoolbuf[spoolidx] = '\0';
+	    return 0;
 	}
-      }
+	/*
+	 * Convert newlines into NULs to allow
+	 * easier scanning of the file.
+	 */
+	while ((b = memchr(spoolbuf + spoolidx, '\n', r)) != NULL)
+	    *b = '\0';
+	spoolidx += r;
     }
-  }
-  fclose(fp);
+    return -1;
 }
 
-      
+
 /*
- * authenticate()
+ * auth_check()
  * Starts an auth_script() for the given <user>, with a class <class>,
  * style <style>, and service <service>.  <style> is necessary,
  * as are <user> and <class>, but <service> is optional -- it defaults
  * to "login".
  * Since auth_script() expects an execl'able program name, authenticate()
  * also concatenates <style> to _PATH_AUTHPROG.
- * Lastly, calls auth_scan(AUTH_NONE) to see if there are any "reject" statements,
+ * Lastly, calls auth_scan(0) to see if there are any "reject" statements,
  * or lack of "auth" statements.
  * Returns -1 on error, 0 on rejection, and >0 on success.
  * (See AUTH_* for the return values.)
  *
  */
+
 int
-authenticate(const char * name, const char * class, const char * style, const char *service)
+auth_check(const char *name, const char *clss, const char *style,
+	   const char *service, int *status)
 {
-  int retval;
+    int	    _status;
 
-  if (style == NULL || *style == '\0')
-    retval = -1;
-  else {
-    char buf[sizeof(_PATH_AUTHPROG) + 64];
+    if (status == NULL)
+	status = &_status;
+    *status = 0;
 
-    if (service == NULL || *service == '\0')
-      service = LOGIN_DEFSERVICE;
+    if (style != NULL) {
+	char	path[MAXPATHLEN];
 
-    free_auth_info();
+	if (service == NULL)
+	    service = LOGIN_DEFSERVICE;
 
-    if (snprintf(buf, sizeof buf, _PATH_AUTHPROG "%s", style) >= sizeof buf)
-      retval = -1;
-    else {
-      retval = auth_script(buf, style, "-s", service, name, class, NULL);
-      if (retval >= 0)
-	retval = auth_scan(AUTH_NONE);
+	snprintf(path, sizeof(path), _PATH_AUTHPROG "%s", style);
+	if (auth_script(path, style, "-s", service, name, clss, 0))
+	    status = 0;
+	else
+	    *status = auth_scan(0);
+
+	return *status & AUTH_ALLOW;
+    }
+    return -1;
+}
+
+
+int
+auth_response(const char *name, const char *class, const char *style,
+	      const char *service, int *status,
+	      const char *challenge, const char *response)
+{
+    int	    _status;
+
+    if (status == NULL)
+	status = &_status;
+    *status = 0;
+
+    if (style != NULL) {
+	int	datalen;
+	char    *data;
+
+	if (service == NULL)
+	    service = LOGIN_DEFSERVICE;
+
+	datalen = strlen(challenge) + strlen(response) + 2;
+
+	if ((data = malloc(datalen)) == NULL) {
+	    syslog(LOG_ERR, "auth_response: %m");
+	    warnx("internal resource failure");
+	} else {
+	    char    path[MAXPATHLEN];
+
+	    snprintf(data, datalen, "%s%c%s", challenge, 0, response);
+	    snprintf(path, sizeof(path), _PATH_AUTHPROG "%s", style);
+	    if (auth_script_data(data, datalen, path, style, "-s", service,
+				 name, class, 0))
+		*status = 0;
+	    else
+		*status = auth_scan(0);
+	    free(data);
+	    return (*status & AUTH_ALLOW);
+	}
+    }
+    return -1;
+}
+
+
+int
+auth_approve(login_cap_t *lc, const char *name, const char *service)
+{
+    int	    r = -1;
+    char    path[MAXPATHLEN];
+
+    if (lc == NULL) {
+	if (strlen(name) > MAXPATHLEN) {
+	    syslog(LOG_ERR, "%s: username too long", name);
+	    warnx("username too long");
+	} else {
+	    struct passwd   *pwd;
+	    char	    *p;
+
+	    pwd = getpwnam(name);
+	    if (pwd == NULL && (p = strchr(name, '.')) != NULL) {
+		int	i = p - name;
+
+		if (i >= MAXPATHLEN)
+		    i = MAXPATHLEN - 1;
+		strncpy(path, name, i);
+		path[i] = '\0';
+		pwd = getpwnam(path); /* Fixed bug in BSDI code... */
+	    }
+	    if ((lc = login_getpwclass(pwd ? pwd->pw_class : NULL)) == NULL)
+		warnx("unable to classify user '%s'", name);
+	}
+    }
+
+    if (lc != NULL) {
+	char	*approve;
+	char	*s;
+
+	if (service != NULL)
+		service = LOGIN_DEFSERVICE;
+
+	snprintf(path, sizeof(path), "approve-%s", service);
+
+        if ((approve = login_getcapstr(lc, s = path, NULL, NULL)) == NULL &&
+	    (approve = login_getcapstr(lc, s = "approve", NULL, NULL)) == NULL)
+	    r = AUTH_OKAY;
+	else {
+
+	    if (approve[0] != '/') {
+		syslog(LOG_ERR, "Invalid %s script: %s", s, approve);
+		warnx("invalid path to approval script");
+	    } else {
+		char	*s;
+
+		s = strrchr(approve, '/') + 1;
+		if (auth_script(approve, s, name,
+				lc->lc_class, service, 0) == 0 &&
+		    (r = auth_scan(AUTH_OKAY) & AUTH_ALLOW) != 0)
+		    auth_env();
+	    }
+	}
+    }
+    return r;
+}
+
+
+void
+auth_env(void)
+{
+    int	    idx = 0;
+    char    *line;
+
+    while ((line = nextline(&idx)) != NULL) {
+	if (!strncasecmp(line, BI_SETENV, sizeof(BI_SETENV)-1)) {
+	    line += sizeof(BI_SETENV) - 1;
+	    if (*line && isspace(*line)) {
+		char	*name;
+		char	ch, *p;
+
+		while (*line && isspace(*line))
+		    ++line;
+		name = line;
+		while (*line && !isspace(*line))
+		    ++line;
+		ch = *(p = line);
+		if (*line)
+		    ++line;
+		if (setenv(name, line, 1))
+		    warn("setenv(%s, %s)", name, line);
+		*p = ch;
+	    }
+	}
+    }
+}
+
+
+char *
+auth_value(const char *what)
+{
+    int	    idx = 0;
+    char    *line;
+
+    while ((line = nextline(&idx)) != NULL) {
+	if (!strncasecmp(line, BI_VALUE, sizeof(BI_VALUE)-1)) {
+	    char    *name;
+
+	    line += sizeof(BI_VALUE) - 1;
+	    while (*line && isspace(*line))
+		++line;
+	    name = line;
+	    if (*line) {
+		int	i;
+		char	ch, *p;
+
+		ch = *(p = line);
+		*line++ = '\0';
+		i = strcmp(name, what);
+		*p = ch;
+		if (i == 0)
+		    return auth_mkvalue(line);
+	    }
+	}
+    }
+    return NULL;
+}
+
+char *
+auth_mkvalue(const char *value)
+{
+    char *big, *p;
+
+    big = malloc(strlen(value) * 4 + 1);
+    if (big != NULL) {
+	for (p = big; *value; ++value) {
+	    switch (*value) {
+	    case '\r':
+		*p++ = '\\';
+		*p++ = 'r';
+		break;
+	    case '\n':
+		*p++ = '\\';
+		*p++ = 'n';
+		break;
+	    case '\\':
+		*p++ = '\\';
+		*p++ = *value;
+		break;
+	    case '\t':
+	    case ' ':
+		if (p == big)
+		    *p++ = '\\';
+		*p++ = *value;
+		break;
+	    default:
+		if (!isprint(*value)) {
+		    *p++ = '\\';
+		    *p++ = ((*value >> 6) & 0x3) + '0';
+		    *p++ = ((*value >> 3) & 0x7) + '0';
+		    *p++ = ((*value     ) & 0x7) + '0';
+		} else
+		    *p++ = *value;
+		break;
+	    }
+	}
+	*p = '\0';
+	big = realloc(big, strlen(big) + 1);
+    }
+    return big;
+}
+
+
+#define NARGC	63
+static int
+_auth_script(const char *data, int nbytes, const char *path, va_list ap)
+{
+    int		    r, argc, status;
+    int		    pfd[2];
+    pid_t	    pid;
+    struct authopts *e;
+    char	    *argv[NARGC+1];
+
+    r = -1;
+    argc = 0;
+    for (e = optfirst; argc < (NARGC - 1) && e != NULL; e = e->next) {
+	argv[argc++] = "-v";
+	argv[argc++] = e->opt;
+    }
+    while (argc < NARGC && (argv[argc] = va_arg(ap, char *)) != NULL)
+	++argc;
+    argv[argc] = NULL;
+
+    if (argc >= NARGC && va_arg(ap, char *))
+	syslog(LOG_ERR, "too many arguments");
+    else if (_secure_path(path, 0, 0) < 0) {
+	syslog(LOG_ERR, "%s: path not secure", path);
+	warnx("invalid script: %s", path);
+    } else if (socketpair(PF_LOCAL, SOCK_STREAM, 0, pfd) < 0) {
+	syslog(LOG_ERR, "unable to create backchannel %m");
+	warnx("internal resource failure");
+    } else switch (pid = fork()) {
+    case -1:			/* fork() failure */
+	close(pfd[0]);
+	close(pfd[1]);
+	syslog(LOG_ERR, "fork %s: %m", path);
+	warnx("internal resource failure");
+	break;
+    case 0:			/* child process */
+	close(pfd[0]);
+	if (pfd[1] != AUTHCOMM_FD) {
+	    if (dup2(pfd[1], AUTHCOMM_FD) < 0)
+		err(1, "dup backchannel");
+	    close(pfd[1]);
+	}
+	for (r = getdtablesize(); --r > AUTHCOMM_FD; )
+	    close(r);
+	execve(path, argv, auth_environ);
+	syslog(LOG_ERR, "exec %s: %m", path);
+	err(1, path);
+    default:			/* parent */
+	close(pfd[1]);
+	if (data && nbytes)
+	    write(pfd[0], data, nbytes);
+	r = spooldata(pfd[0]);
+	close(pfd[0]);
+	if (waitpid(pid, &status, 0) < 0) {
+	    syslog(LOG_ERR, "%s: waitpid: %m", path);
+	    warnx("internal failure");
+	    r = -1;
+	} else {
+	    if (r != 0 || !WIFEXITED(status) || WEXITSTATUS(status) != 0)
+		r = -1;
+	}
+	/* kill the buffer if it is of no use */
+	if (r != 0) {
+	    free(spoolbuf);
+	    spoolbuf = NULL;
+	    spoolidx = 0;
+	}
+	break;
     }
-  }
-  return retval;
+    return r;
 }
 
 
+
 /*
  * auth_script()
  * Runs an authentication program with specified arguments.
  * It sets up file descriptor 3 for the program to write to;
  * it stashes the output somewhere.  The output of the program
  * consists of statements:
- *	reject
+ *	reject [challenge|silent]
  *	authorize [root|secure]
  *	setenv <name> [<value>]
  *	remove <file>
  *
- * Terribly exciting, isn't it?  There is no limit specified in
- * BSDi's API for how much output can be present, but we should
- * keep it fairly small, I think.
- * No more than AUTHMAXLINES lines.
+ * Terribly exciting, isn't it?
+ * Output cannot exceed AUTHMAXSPOOL characters.
  */
 
 int
-auth_script(const char * path, ...)
+auth_script(const char *path, ...)
 {
-  va_list ap;
-  int pid, status;
-  int argc = 0;
-  int p[2];	/* pipes */
-  char *argv[AUTHMAXARGS+1];
-
-  va_start(ap, path);
-  while (argc < AUTHMAXARGS && (argv[argc++] = va_arg(ap, char*)) != NULL)
-    ;
-  argv[argc] = NULL;
-  va_end(ap);
-
-  fflush(NULL);
-
-  if (pipe(p) >= 0) {
-    if ((pid = fork()) == -1) {
-      close(p[0]);
-      close(p[1]);
-    } else if (pid == 0) {    /* Child */
-      close(p[0]);
-      dup2(p[1], 3);
-      if (setenv("PATH", _PATH_DEFPATH, 1)==0 && setenv("SHELL", _PATH_BSHELL, 1)==0)
-	execv(path, argv);
-      _exit(1);
-    } else {
-      close(p[1]);
-      collect_info(p[0]);
-      if (waitpid(pid, &status, 0) != -1 && WIFEXITED(status) && !WEXITSTATUS(status))
-	return 0;
-    }
-  }
-  return -1;
-}
+    int		r;
+    va_list	ap;
 
+    va_start(ap, path);
+    r = _auth_script(NULL, 0, path, ap);
+    va_end(ap);
+    return r;
+}
 
-/*
- * auth_env()
- * Processes the stored "setenv" lines from the stored authentication
- * output.
- */
 
 int
-auth_env(void)
+auth_script_data(const char *data, int nbytes, const char *path, ...)
+{
+    int		r;
+    va_list	ap;
+
+    va_start(ap, path);
+    r = _auth_script(data, nbytes, path, ap);
+    va_end(ap);
+    return r;
+}
+
+
+static void
+add_rmlist(const char *file)
 {
-  int i;
-
-  for (i = 0; i < auth_info.env_count; i++) {
-    char *nam = auth_info.env[i];
-    char *ptr = nam + strcspn(nam, " \t=");
-    if (*ptr) {
-      *ptr++ = '\0';
-      ptr += strspn(ptr, " \t");
+    struct rmfiles *rm;
+
+    if ((rm = malloc(sizeof(struct rmfiles) + strlen(file) + 1)) == NULL)
+	syslog(LOG_ERR, "add_rmfile malloc: %m");
+    else {
+	strcpy(rm->file, file);
+	rm->next = rmfirst;
+	rmfirst = rm;
     }
-    setenv(nam, ptr, 1);
-  }
-  return 0;
 }
 
 
-/*
- * auth_scan()
- * Goes through the output of the auth_script/authenticate, and
- * checks for a failure or authentication.
- * <ok> is a default authentication value -- if there are no
- * rejection or authentication statements, then it is returned
- * unmodified.
- * AUTH_NONE is returned if there were any reject statements
- * from the authentication program (invoked by auth_script()), and
- * AUTH, AUTH_ROOTOKAY, and/or AUTH_SECURE are returned if the
- * appropriate directives were found.  Note that AUTH* are
- * *bitmasks*!
- */
+int
+auth_scan(int okay)
+{
+    int	    idx = 0;
+    char    *line;
+
+    while ((line = nextline(&idx)) != NULL) {
+	if (!strncasecmp(line, BI_REJECT, sizeof(BI_REJECT)-1)) {
+	    line += sizeof(BI_REJECT) - 1;
+	    while (*line && isspace(*line))
+		++line;
+	    if (*line) {
+		if (!strcasecmp(line, "silent"))
+		    return AUTH_SILENT;
+		if (!strcasecmp(line, "challenge"))
+		    return AUTH_CHALLENGE;
+	    }
+	    return 0;
+	} else if (!strncasecmp(line, BI_AUTH, sizeof(BI_AUTH)-1)) {
+	    line += sizeof(BI_AUTH) - 1;
+	    while (*line && isspace(*line))
+		++line;
+	    if (*line == '\0')
+		okay |= AUTH_OKAY;
+	    else if (!strcasecmp(line, "root"))
+		okay |= AUTH_ROOTOKAY;
+	    else if (!strcasecmp(line, "secure"))
+		okay |= AUTH_SECURE;
+	}
+	else if (!strncasecmp(line, BI_REMOVE, sizeof(BI_REMOVE)-1)) {
+	    line += sizeof(BI_REMOVE) - 1;
+	    while (*line && isspace(*line))
+		++line;
+	    if (*line)
+		add_rmlist(line);
+	}
+    }
+
+    return okay;
+}
+
 
 int
-auth_scan(int ok)
+auth_setopt(const char *n, const char *v)
 {
-  if (auth_info.reject)
-    return 0;
-  return ok | auth_info.auths;
+    int		    r;
+    struct authopts *e;
+
+    if ((e = malloc(sizeof(*e) + strlen(n) + strlen(v) + 1)) == NULL)
+	r = -1;
+    else {
+	sprintf(e->opt, "%s=%s", n, v);
+	e->next = optfirst;
+	optfirst = e;
+	r = 0;
+    }
+    return r;
 }
 
 
-/*
- * auth_rmfiles()
- * Removes any files that the authentication program said needed to be
- * removed, said files having come from a previous execution of
- * auth_script().
- */
+void
+auth_clropts(void)
+{
+    struct authopts *e;
 
-int
+    while ((e = optfirst) != NULL) {
+	optfirst = e->next;
+	free(e);
+    }
+}
+
+
+void
 auth_rmfiles(void)
 {
-  int i = auth_info.file_count;
-  while (i-- > 0) {
-    unlink(auth_info.files[i]);
-    free(auth_info.files[i]);
-    auth_info.files[i] = NULL;
-  }
-  return 0;
+    struct rmfiles  *rm;
+
+    while ((rm = rmfirst) != NULL) {
+	unlink(rm->file);
+	rmfirst = rm->next;
+	free(rm);
+    }
 }
 
+#endif
+
 
 /*
  * auth_checknologin()
@@ -370,6 +654,7 @@ auth_checknologin(login_cap_t *lc)
  * reading, it prints it out to stdout, and then exits.  Otherwise,
  * it returns 0 (meaning no nologin file).
  */
+
 int
 auth_cat(const char *file)
 {
@@ -379,7 +664,7 @@ auth_cat(const char *file)
   if ((fd = open(file, O_RDONLY)) < 0)
     return 0;
   while ((count = read(fd, buf, sizeof(buf))) > 0)
-    write(fileno(stdout), buf, count);
+    (void)write(fileno(stdout), buf, count);
   close(fd);
   return 1;
 }
-- 
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