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diff --git a/authfile.c b/authfile.c
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index e93d867..4fc5b3d 100644
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--- a/authfile.c
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+++ b/authfile.c
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@@ -32,6 +32,7 @@
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 #include <errno.h>
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 #include <fcntl.h>
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+#include <grp.h>
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 #include <stdio.h>
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 #include <stdarg.h>
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 #include <stdlib.h>
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@@ -207,6 +208,13 @@ sshkey_perm_ok(int fd, const char *filename)
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 #ifdef HAVE_CYGWIN
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 	if (check_ntsec(filename))
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 #endif
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+	if (st.st_mode & 040) {
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+		struct group *gr;
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+
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+		if ((gr = getgrnam("ssh_keys")) && (st.st_gid == gr->gr_gid))
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+			st.st_mode &= ~040;
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+	}
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+
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 	if ((st.st_uid == getuid()) && (st.st_mode & 077) != 0) {
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 		error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@");
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 		error("@         WARNING: UNPROTECTED PRIVATE KEY FILE!          @");