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commit 8b59c73386ddb64331ee03c29925a18dae547733
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Author: Carlos O'Donell <carlos@systemhalted.org>
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Date: Wed Jul 8 02:42:11 2015 -0400
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Fix ruserok scalability with large ~/.rhosts file.
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Fixes bug 18557.
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diff --git glibc-2.17-c758a686/inet/rcmd.c glibc-2.17-c758a686/inet/rcmd.c
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index 98b3735..91623b0 100644
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--- glibc-2.17-c758a686/inet/rcmd.c
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+++ glibc-2.17-c758a686/inet/rcmd.c
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@@ -809,29 +809,38 @@ __validuser2_sa(hostf, ra, ralen, luser, ruser, rhost)
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*p = '\0'; /* <nul> terminate username (+host?) */
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/* buf -> host(?) ; user -> username(?) */
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+ if (*buf == '\0')
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+ break;
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+ if (*user == '\0')
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+ user = luser;
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+
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+ /* First check the user part. This is an optimization, since
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+ one should always check the host first in order to detect
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+ negative host checks (which we check for later). */
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+ ucheck = __icheckuser (user, ruser);
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+
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+ /* Either we found the user, or we didn't and this is a
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+ negative host check. We must do the negative host lookup
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+ in order to preserve the semantics of stopping on this line
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+ before processing others. */
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+ if (ucheck != 0 || *buf == '-') {
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+
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+ /* Next check host part */
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+ hcheck = __checkhost_sa (ra, ralen, buf, rhost);
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+
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+ /* Negative '-host user(?)' match? */
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+ if (hcheck < 0)
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+ break;
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- /* First check host part */
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- hcheck = __checkhost_sa (ra, ralen, buf, rhost);
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-
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- if (hcheck < 0)
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- break;
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-
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- if (hcheck) {
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- /* Then check user part */
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- if (! (*user))
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- user = luser;
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-
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- ucheck = __icheckuser (user, ruser);
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-
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- /* Positive 'host user' match? */
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- if (ucheck > 0) {
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+ /* Positive 'host user' match? */
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+ if (hcheck > 0 && ucheck > 0) {
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retval = 0;
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break;
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}
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- /* Negative 'host -user' match? */
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- if (ucheck < 0)
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- break;
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+ /* Negative 'host -user' match? */
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+ if (hcheck > 0 && ucheck < 0)
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+ break;
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/* Neither, go on looking for match */
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}
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