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When encountering a message that has been mangled in the "mixed up" way by an intermediate MTA, notmuch should instead repair it and index the repaired form. When it does this, it also associates the index.repaired=mixedup property with the message. If a problem is found with this repair process, or an improved repair process is proposed later, this should make it easy for people to reindex the relevant message. The property will also hopefully make it easier to diagnose this particular problem in the future. Signed-off-by: Daniel Kahn Gillmor <dkg@fifthhorseman.net>
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5.5 KiB
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148 lines
5.5 KiB
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==================
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notmuch-properties
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==================
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SYNOPSIS
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========
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**notmuch** **count** **property:**\ <*key*>=<*value*>
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**notmuch** **search** **property:**\ <*key*>=<*value*>
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**notmuch** **show** **property:**\ <*key*>=<*value*>
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**notmuch** **reindex** **property:**\ <*key*>=<*value*>
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**notmuch** **tag** +<*tag*> **property:**\ <*key*>=<*value*>
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**notmuch** **dump** **--include=properties**
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**notmuch** **restore** **--include=properties**
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DESCRIPTION
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===========
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Several notmuch commands can search for, modify, add or remove
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properties associated with specific messages. Properties are
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key/value pairs, and a message can have more than one key/value pair
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for the same key.
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While users can select based on a specific property in their search
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terms with the prefix **property:**, the notmuch command-line
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interface does not provide mechanisms for modifying properties
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directly to the user.
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Instead, message properties are expected to be set and used
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programmatically, according to logic in notmuch itself, or in
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extensions to it.
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Extensions to notmuch which make use of properties are encouraged to
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report the specific properties used to the upstream notmuch project,
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as a way of avoiding collisions in the property namespace.
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CONVENTIONS
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===========
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Any property with a key that starts with "index." will be removed (and
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possibly re-set) upon reindexing (see **notmuch-reindex(1)**).
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MESSAGE PROPERTIES
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==================
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The following properties are set by notmuch internally in the course
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of its normal activity.
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**index.decryption**
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If a message contains encrypted content, and notmuch tries to
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decrypt that content during indexing, it will add the property
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``index.decryption=success`` when the cleartext was successfully
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indexed. If notmuch attempts to decrypt any part of a message
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during indexing and that decryption attempt fails, it will add the
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property ``index.decryption=failure`` to the message.
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Note that it's possible for a single message to have both
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``index.decryption=success`` and ``index.decryption=failure``.
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Consider an encrypted e-mail message that contains another
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encrypted e-mail message as an attachment -- if the outer message
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can be decrypted, but the attached part cannot, then both
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properties will be set on the message as a whole.
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If notmuch never tried to decrypt an encrypted message during
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indexing (which is the default, see ``index.decrypt`` in
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**notmuch-config(1)**), then this property will not be set on that
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message.
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**session-key**
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When **notmuch-show(1)** or **nomtuch-reply** encounters a message
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with an encrypted part, if notmuch finds a ``session-key``
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property associated with the message, it will try that stashed
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session key for decryption.
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If you do not want to use any stashed session keys that might be
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present, you should pass those programs ``--decrypt=false``.
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Using a stashed session key with "notmuch show" will speed up
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rendering of long encrypted threads. It also allows the user to
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destroy the secret part of any expired encryption-capable subkey
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while still being able to read any retained messages for which
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they have stashed the session key. This enables truly deletable
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e-mail, since (once the session key and asymmetric subkey are both
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destroyed) there are no keys left that can be used to decrypt any
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copy of the original message previously stored by an adversary.
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However, access to the stashed session key for an encrypted message
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permits full byte-for-byte reconstruction of the cleartext
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message. This includes attachments, cryptographic signatures, and
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other material that cannot be reconstructed from the index alone.
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See ``index.decrypt`` in **notmuch-config(1)** for more
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details about how to set notmuch's policy on when to store session
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keys.
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The session key should be in the ASCII text form produced by
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GnuPG. For OpenPGP, that consists of a decimal representation of
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the hash algorithm used (identified by number from RFC 4880,
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e.g. 9 means AES-256) followed by a colon, followed by a
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hexadecimal representation of the algorithm-specific key. For
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example, an AES-128 key might be stashed in a notmuch property as:
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``session-key=7:14B16AF65536C28AF209828DFE34C9E0``.
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**index.repaired**
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Some messages arrive in forms that are confusing to view; they can
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be mangled by mail transport agents, or the sending mail user
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agent may structure them in a way that is confusing. If notmuch
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knows how to both detect and repair such a problematic message, it
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will do so during indexing.
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If it applies a message repair during indexing, it will use the
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``index.repaired`` property to note the type of repair(s) it
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performed.
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``index.repaired=skip-protected-headers-legacy-display`` indicates
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that when indexing the cleartext of an encrypted message, notmuch
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skipped over a "legacy-display" text/rfc822-headers part that it
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found in that message, since it was able to index the built-in
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protected headers directly.
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``index.repaired=mixedup`` indicates the repair of a "Mixed Up"
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encrypted PGP/MIME message, a mangling typically produced by
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Microsoft's Exchange MTA. See
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https://tools.ietf.org/html/draft-dkg-openpgp-pgpmime-message-mangling
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for more information.
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SEE ALSO
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========
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**notmuch(1)**,
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**notmuch-config(1)**,
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**notmuch-dump(1)**,
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**notmuch-insert(1)**,
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**notmuch-new(1)**,
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**notmuch-reindex(1)**,
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**notmuch-reply(1)**,
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**notmuch-restore(1)**,
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**notmuch-show(1)**,
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***notmuch-search-terms(7)**
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