Accept Force Renew messages with zero xid - #719
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Included review availability: Your plan provides up to 2 included reviews per hour; 1 remains after this review. WalkthroughThe DHCP handler now authenticates ChangesDHCP FORCERENEW and BOOTP handling
Estimated code review effort: 3 (Moderate) | ~25 minutes Merge Risk: ⚪ Minimal · up to This change allows DHCPFORCERENEW messages with xid zero to reach authentication while unauthenticated messages remain rejected; no actionable merge-blocking risk remains beyond normal checks and review. 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
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Actionable comments posted: 2
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Inline comments:
In `@src/dhcp.c`:
- Around line 3135-3138: In dhcp_handlebootp, move the DHCPCD_BOOTP rejection
block after the XID-mismatch detection and dhcp_redirect_dhcp handling, so
packets belonging to another interface are redirected before any BOOTP-only
return. Preserve the existing BOOTP log and return for packets that remain on
the current interface.
- Line 3144: Update the xid-zero DHCP_FORCERENEW handling in the surrounding
message-processing logic to reject messages lacking DHO_AUTHENTICATION
unconditionally, regardless of DHCPCD_AUTH_REQUIRE. Ensure rejection occurs
before any call to dhcp_renew() or dhcp_inform(), while preserving authenticated
FORCERENEW processing.
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src/dhcp.c
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Require DHO_AUTHENTICATION for FORCERENEW before the xid-zero exception and defer the BOOTP-mode reject so authenticated reconfigure still runs.
| logdebugx("%s: validated using 0x%08" PRIu32, ifp->name, | ||
| state->auth.token->secretid); | ||
| else | ||
| loginfox("%s: accepted reconfigure key", ifp->name); |
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drop this to debug as renew is now debug
| logdebugx("%s: validated using 0x%08" PRIu32, | ||
| ifp->name, state->auth.token->secretid); | ||
| else | ||
| loginfox("%s: accepted reconfigure key", |
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same, renew msgs are debug level, so consider dropping the log level here too
1 participant
Allow DHCPFORCERENEW messages with an xid of zero to proceed to authentication check, while preserving the existing xid validation for other DHCP messages. FORCERENEW without auth will still fail as expected.
MicroTik dhcp servers set xid to 0.
Fixes #615