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command_matches_fnmatch: retry with canonicalized path if possible

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If ctx->user.cmnd doesn't match, use ctx->user.cmnd_dir (if present)
to construct a canonicalized path and match on that.
This commit is contained in:
Todd C. Miller
2023-12-04 18:35:08 -07:00
parent 24f443981f
commit 44f0908e73
1 changed files with 14 additions and 12 deletions
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26
plugins/sudoers/match_command.c
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@@ -377,8 +377,18 @@ command_matches_fnmatch(struct sudoers_context *ctx, const char *sudoers_cmnd,
#endif
debug_decl(command_matches_fnmatch, SUDOERS_DEBUG_MATCH);
/* A relative ctx->user.cmnd will not match, try canonicalized version. */
if (ctx->user.cmnd[0] != '/') {
/*
* Return ALLOW if fnmatch(3) succeeds AND
* a) there are no args in sudoers OR
* b) there are no args on command line and none required by sudoers OR
* c) there are args in sudoers and on command line and they match
* else return DENY.
*
* We do not attempt to match a relative path unless there is a
* canonicalized version.
*/
if (cmnd[0] != '/' || fnmatch(sudoers_cmnd, cmnd, FNM_PATHNAME) != 0) {
/* No match, retry using the canonicalized path (if possible). */
if (ctx->user.cmnd_dir == NULL)
debug_return_int(DENY);
len = snprintf(buf, sizeof(buf), "%s/%s", ctx->user.cmnd_dir,
@@ -386,18 +396,10 @@ command_matches_fnmatch(struct sudoers_context *ctx, const char *sudoers_cmnd,
if (len < 0 || len >= ssizeof(buf))
debug_return_int(DENY);
cmnd = buf;
if (fnmatch(sudoers_cmnd, cmnd, FNM_PATHNAME) != 0)
debug_return_int(DENY);
}
/*
* Return ALLOW if fnmatch(3) succeeds AND
* a) there are no args in sudoers OR
* b) there are no args on command line and none required by sudoers OR
* c) there are args in sudoers and on command line and they match
* else return DENY.
*/
if (fnmatch(sudoers_cmnd, cmnd, FNM_PATHNAME) != 0)
debug_return_int(DENY);
if (command_args_match(ctx, sudoers_cmnd, sudoers_args) == ALLOW) {
/* Open the file for fdexec or for digest matching. */
if (!open_cmnd(cmnd, digests, &fd))