Brad Arant
cd5e0a9905
IMAP (RFC 3501): LOGIN through UID, previously all stubs except CAPABILITY/LOGOUT/a partial APPEND. Multi-folder support with per-folder UID/flag indexing (new MailFolder class, backed by .uidvalidity/.uidnext/ .imapindex sidecar files), ENVELOPE support (new MessageHeaders class: header parsing, address-list parsing, IMAP quoting), and shared cursor-based argument parsing (new IMAPArgs class: sequence sets, flag lists, dates, folder-name normalization, and path-traversal protection via isValidFolderName - a bare ".." folder name would otherwise resolve into a sibling user's mailbox directory). POP3 (RFC 1939): USER through QUIT, previously only CAPA. Added UIDL. POP3 handlers use cursor-based parsing throughout rather than indexed access - ZString's copy constructor doesn't copy its `list` field, and POP3's dispatch passes the request by value, so indexed access into a copy was silently reading nothing. SMTP: DMARC evaluation added to the DATA-terminator path (DKIM verification + alignment/policy, Authentication-Results header, conditional rejection matching RFC 7489 6.3's p=reject + sampled pct=). AUTH LOGIN now handles RFC 4954's optional inline initial response (e.g. Python smtplib's "AUTH LOGIN <base64>" in one line) instead of only the exact three-line form. Outbound relay now forces IPv4 (AF_INET) instead of AF_UNSPEC - this server's IPv4 has a correct PTR record and SPF coverage, its IPv6 doesn't, and Gmail was rejecting outbound mail with 550 5.7.25 as a result. Delivery pipeline: local delivery now runs the message through SpamAssassin (new SpamAssassinFilter class, speaking spamd's PROCESS protocol directly over a raw socket - fails open/delivers unscanned if spamd is unreachable) instead of a plain hardlink, since scanning can tag/modify content. BARANTMailConfig: extracted config loading into its own class. compile: (see individual file changes - build script adjustments to match the above). Deliberately excluded from this commit: barantmail.log/ barantmail-service.log (operational logs, not source - barantmail.log in particular was the runaway 55GB/12.9GB file from a busy-loop bug fixed separately in ServerCore) and barantmail.cfg (this server's own live deployment config, matching how APIServer's equivalent config also stays untracked).
51 lines
1.8 KiB
C++
51 lines
1.8 KiB
C++
#ifndef __DKIMVerifier_h__
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#define __DKIMVerifier_h__
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#include <string>
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#include <vector>
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namespace mail {
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///
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/// DKIMVerifier checks the DKIM-Signature header(s) (RFC 6376) on an
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/// already-fully-received message: for each one present, fetches the
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/// claimed signer's public key from DNS and verifies the signature
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/// against it. Exists specifically to support DMARC's DKIM-alignment
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/// check (DMARCChecker) - a signature that verifies but whose d=
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/// domain does not align with the message's From: header doesn't
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/// make the message DMARC-authenticated via DKIM, so both the
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/// cryptographic result AND the signing domain are reported back for
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/// DMARC to judge alignment itself.
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///
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/// A message may carry more than one DKIM-Signature (e.g. one from
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/// the original sender, one added by a mailing list) - every one
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/// present is verified independently.
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///
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/// Unlike DKIMSigner (which only ever produces relaxed/relaxed,
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/// rsa-sha256 signatures of its own), this has to interoperate with
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/// whatever a real remote sender actually used, so it supports all
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/// four canonicalization combinations (simple/relaxed for header/body)
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/// a real DKIM-Signature's c= tag can specify. Does not implement
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/// signature expiry (x=) checking or Ed25519 (RFC 8463) - both real
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/// gaps, but the overwhelming majority of real-world DKIM signatures
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/// today are plain rsa-sha256 with no expiry set.
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///
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class DKIMVerifier {
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public:
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struct SignatureResult {
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bool valid = false;
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std::string domain; // d= tag - the identity DMARC needs to align against
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std::string selector; // s= tag
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};
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static std::vector<SignatureResult> verify(const std::string &message);
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};
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}
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#endif
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