diff -r e502c48f9ba9 lib/auth_unix.c
--- a/lib/auth_unix.c	Thu Oct 25 08:10:12 2007 +0200
+++ b/lib/auth_unix.c	Fri Nov 30 11:33:23 2007 +0100
@@ -48,12 +48,133 @@
 #include <stdlib.h>
 #include <pwd.h>
 #include <grp.h>
+#include <stdio.h>
 #include <ctype.h>
 #include <string.h>
 
 #include "auth.h"
 #include "libcyr_cfg.h"
 #include "xmalloc.h"
+
+#if defined(__FreeBSD__) || defined(__NetBSD__) || defined(__OpenBSD__)
+/*
+ * __getgrent.c - This file is part of the libc-8086/grp package for ELKS,
+ * Copyright (C) 1995, 1996 Nat Friedman <ndf@linux.mit.edu>.
+ *
+ *  This library is free software; you can redistribute it and/or
+ *  modify it under the terms of the GNU Library General Public
+ *  License as published by the Free Software Foundation; either
+ *  version 2 of the License, or (at your option) any later version.
+ *
+ *  This library is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ *  Library General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Library General Public
+ *  License along with this library; if not, write to the Free
+ *  Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ */
+
+#include <unistd.h>
+#include <string.h>
+#include <errno.h>
+
+static struct group *__getgrent(int grp_fd, char *line_buff, char **members)
+{
+    short line_index;
+    short buff_size;
+    static struct group group;
+    register char *ptr;
+    char *field_begin;
+    short member_num;
+    char *endptr;
+    int line_len;
+
+    /* We use the restart label to handle malformatted lines */
+    restart:
+    line_index = 0;
+    buff_size = 256;
+
+    line_buff = realloc(line_buff, buff_size);
+    while (1) {
+        if ((line_len = read(grp_fd, line_buff + line_index,
+                        buff_size - line_index)) <= 0) {
+            return NULL;
+        }
+        field_begin = strchr(line_buff, '\n');
+        if (field_begin != NULL) {
+            lseek(grp_fd,
+                    (long) (1 + field_begin -
+                            (line_len + line_index + line_buff)), SEEK_CUR);
+            *field_begin = '\0';
+            if (*line_buff == '#' || *line_buff == ' '
+                    || *line_buff == '\n' || *line_buff == '\t')
+                goto restart;
+            break;
+        } else {
+            /* Allocate some more space */
+            line_index = buff_size;
+            buff_size += 256;
+            line_buff = realloc(line_buff, buff_size);
+        }
+    }
+
+    /* Now parse the line */
+    group.gr_name = line_buff;
+    ptr = strchr(line_buff, ':');
+    if (ptr == NULL)
+        goto restart;
+    *ptr++ = '\0';
+
+    group.gr_passwd = ptr;
+    ptr = strchr(ptr, ':');
+    if (ptr == NULL)
+        goto restart;
+    *ptr++ = '\0';
+
+    field_begin = ptr;
+    ptr = strchr(ptr, ':');
+    if (ptr == NULL)
+        goto restart;
+    *ptr++ = '\0';
+
+    group.gr_gid = (gid_t) strtoul(field_begin, &endptr, 10);
+    if (*endptr != '\0')
+        goto restart;
+
+    member_num = 0;
+    field_begin = ptr;
+
+    if (members != NULL)
+        free(members);
+    members = (char **) malloc((member_num + 1) * sizeof(char *));
+    for ( ; field_begin && *field_begin != '\0'; field_begin = ptr) {
+        if ((ptr = strchr(field_begin, ',')) != NULL)
+            *ptr++ = '\0';
+        members[member_num++] = field_begin;
+        members = (char **) realloc(members,
+                (member_num + 1) * sizeof(char *));
+    }
+    members[member_num] = NULL;
+
+    group.gr_mem = members;
+    return &group;
+}
+
+static char *line_buff = NULL;
+static char **members  = NULL;
+
+struct group *fgetgrent(FILE *file)
+{
+    if (file == NULL) {
+        errno = EINTR;
+        return NULL;
+    }
+    return __getgrent(fileno(file), line_buff, members);
+}
+#endif /* __FreeBSD__ */
 
 struct auth_state {
     char userid[81];
@@ -142,6 +263,25 @@ static char allowedchars[256] = {
     0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
 };
 
+static struct group* fgetgrnam(const char* name)
+{
+    struct group *grp;
+    FILE *groupfile;
+
+    groupfile = fopen("/etc/imapd.group", "r");
+    if (!groupfile) groupfile = fopen("/etc/group", "r");
+    if (groupfile) {
+       while ((grp = fgetgrent(groupfile))) {
+         if (strcmp(grp->gr_name, name) == 0) {
+           fclose(groupfile);
+           return grp;
+         }
+       }
+    } 
+    if (groupfile) fclose(groupfile);
+    return NULL;
+} 
+
 /*
  * Convert 'identifier' into canonical form.
  * Returns a pointer to a static buffer containing the canonical form
@@ -177,7 +317,7 @@ size_t len;
      */
     
     if (!strncmp(retbuf, "group:", 6)) {
-	grp = getgrnam(retbuf+6);
+	grp = fgetgrnam(retbuf+6);
 	if (!grp) return 0;
 	strcpy(retbuf+6, grp->gr_name);
 	return retbuf;
@@ -228,6 +368,7 @@ static struct auth_state *mynewstate(con
     int ret, ngroups = 0;
 #else
     char **mem;
+    FILE *groupfile;
 #endif
 
     identifier = mycanonifyid(identifier, 0);
@@ -286,20 +427,23 @@ err:
     if (groupids) free(groupids);
 
 #else /* !HAVE_GETGROUPLIST */
-    setgrent();
-    while ((grp = getgrent())) {
-	for (mem = grp->gr_mem; *mem; mem++) {
-	    if (!strcmp(*mem, identifier)) break;
-	}
-
-	if (*mem || (pwd && pwd->pw_gid == grp->gr_gid)) {
-	    newstate->ngroups++;
-	    newstate->group = (char **)xrealloc((char *)newstate->group,
-						newstate->ngroups * sizeof(char *));
-	    newstate->group[newstate->ngroups-1] = xstrdup(grp->gr_name);
-	}
-    }
-    endgrent();
+    groupfile = fopen("/etc/imapd.group", "r");
+    if (!groupfile) groupfile = fopen("/etc/group", "r");
+    if (groupfile) {
+       while ((grp = fgetgrent(groupfile))) {
+         for (mem = grp->gr_mem; *mem; mem++) {
+            if (!strcmp(*mem, identifier)) break;
+         }
+
+         if (*mem || (pwd && pwd->pw_gid == grp->gr_gid)) {
+            newstate->ngroups++;
+            newstate->group = (char **)xrealloc((char *)newstate->group,
+                                                newstate->ngroups * sizeof(char *));
+            newstate->group[newstate->ngroups-1] = xstrdup(grp->gr_name);
+         }
+       }
+       fclose(groupfile);
+    } 
 #endif /* HAVE_GETGROUPLIST */
 
     return newstate;
