[Bug 2022] ssh segfaults when using ldns, SSHFP, a DNSSEC-enabled resolver and a CNAME

[bugzilla-daemon at mindrot.org]

https://bugzilla.mindrot.org/show_bug.cgi?id=2022

--- Comment #3 from gregdlg+mr at hochet.info ---
The failure case happens when your DNS resolver does the DNSSEC
validation for you and sets the ad flag (but RRSIG are still included
DNS answer). Then SSH trusts the resolver, skip the DNSSEC validation
and does not initialize rrset->rri_nsig, hence rrset->rri_nsig is 0 and
the memory is not allocated.

    /* Check for authenticated data */
    if (ldns_pkt_ad(pkt)) {
        rrset->rri_flags |= RRSET_VALIDATED;
    } else { /* AD is not set, try autonomous validation */
        //...
        rrset->rri_nsigs = ldns_rr_list_rr_count(rrsigs);
        debug2("ldns: got %u signature(s) (RRTYPE %u) from DNS",
               rrset->rri_nsigs, LDNS_RR_TYPE_RRSIG);
        //...
    }

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