62 lines
1.5 KiB
Diff
62 lines
1.5 KiB
Diff
#! /bin/sh /usr/share/dpatch/dpatch-run
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## 21exrc_writability_check.dpatch by <hesso@pool.math.tu-berlin.de>
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##
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## DP: No description.
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@DPATCH@
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diff -Naur nvi-1.81.6.orig/ex/ex_init.c nvi-1.81.6/ex/ex_init.c
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--- nvi-1.81.6.orig/ex/ex_init.c 2007-11-18 17:41:42.000000000 +0100
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+++ nvi-1.81.6/ex/ex_init.c 2008-05-01 18:24:45.000000000 +0200
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@@ -26,6 +26,9 @@
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#include <string.h>
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#include <unistd.h>
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+#include <pwd.h>
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+#include <grp.h>
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+
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#include "../common/common.h"
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#include "tag.h"
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#include "pathnames.h"
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@@ -346,6 +349,9 @@
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int nf1, nf2;
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char *a, *b, buf[MAXPATHLEN];
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+ struct group *grp_p;
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+ struct passwd *pwd_p;
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+
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/* Check for the file's existence. */
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if (stat(path, sbp))
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return (NOEXIST);
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@@ -359,10 +365,30 @@
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}
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/* Check writeability. */
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- if (sbp->st_mode & (S_IWGRP | S_IWOTH)) {
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+ if (sbp->st_mode & S_IWOTH) {
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etype = WRITER;
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goto denied;
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}
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+ if (sbp->st_mode & S_IWGRP) {
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+ /* on system error (getgrgid or getpwnam return NULL) set etype to WRITER
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+ * and continue execution */
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+ if( (grp_p = getgrgid(sbp->st_gid)) == NULL) {
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+ etype = WRITER;
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+ goto denied;
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+ }
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+
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+ /* lookup the group members' uids for an uid different from euid */
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+ while( ( *(grp_p->gr_mem) ) != NULL) { /* gr_mem is a null-terminated array */
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+ if( (pwd_p = getpwnam(*(grp_p->gr_mem)++)) == NULL) {
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+ etype = WRITER;
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+ goto denied;
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+ }
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+ if(pwd_p->pw_uid != euid) {
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+ etype = WRITER;
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+ goto denied;
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+ }
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+ }
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+ }
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return (RCOK);
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denied: a = msg_print(sp, path, &nf1);
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