Prefer encryption for the peer if the message is encrypted or signed with the known key (#3844)

Note that if the message is encrypted, we don't check whether it's signed with an attached key
currently, otherwise a massive refactoring of the code is needed because for encrypted messages a
signature is checked and discarded first now.
This commit is contained in:
iequidoo
2022-12-15 13:27:06 -03:00
committed by iequidoo
parent 03c273e30f
commit a3fe105256
8 changed files with 372 additions and 237 deletions

2
.gitattributes vendored
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@@ -4,7 +4,7 @@
# This directory contains email messages verbatim, and changing CRLF to # This directory contains email messages verbatim, and changing CRLF to
# LF will corrupt them. # LF will corrupt them.
test-data/* text=false test-data/** text=false
# binary files should be detected by git, however, to be sure, you can add them here explicitly # binary files should be detected by git, however, to be sure, you can add them here explicitly
*.png binary *.png binary

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@@ -19,6 +19,7 @@
- Fix cargo clippy and doc errors after Rust update to 1.66 #3850 - Fix cargo clippy and doc errors after Rust update to 1.66 #3850
- Don't send GroupNameChanged message if the group name doesn't change in terms of - Don't send GroupNameChanged message if the group name doesn't change in terms of
improve_single_line_input() #3852 improve_single_line_input() #3852
- Prefer encryption for the peer if the message is encrypted or signed with the known key #3849
## 1.103.0 ## 1.103.0

View File

@@ -31,7 +31,7 @@ pub async fn try_decrypt(
decryption_info: &DecryptionInfo, decryption_info: &DecryptionInfo,
) -> Result<Option<(Vec<u8>, HashSet<Fingerprint>)>> { ) -> Result<Option<(Vec<u8>, HashSet<Fingerprint>)>> {
// Possibly perform decryption // Possibly perform decryption
let public_keyring_for_validate = keyring_from_peerstate(&decryption_info.peerstate); let public_keyring_for_validate = keyring_from_peerstate(decryption_info.peerstate.as_ref());
let encrypted_data_part = match get_autocrypt_mime(mail) let encrypted_data_part = match get_autocrypt_mime(mail)
.or_else(|| get_mixed_up_mime(mail)) .or_else(|| get_mixed_up_mime(mail))
@@ -251,7 +251,7 @@ fn has_decrypted_pgp_armor(input: &[u8]) -> bool {
/// ///
/// Returns `None` if the part is not a Multipart/Signed part, otherwise retruns the set of key /// Returns `None` if the part is not a Multipart/Signed part, otherwise retruns the set of key
/// fingerprints for which there is a valid signature. /// fingerprints for which there is a valid signature.
fn validate_detached_signature( pub(crate) fn validate_detached_signature(
mail: &ParsedMail<'_>, mail: &ParsedMail<'_>,
public_keyring_for_validate: &Keyring<SignedPublicKey>, public_keyring_for_validate: &Keyring<SignedPublicKey>,
) -> Result<Option<(Vec<u8>, HashSet<Fingerprint>)>> { ) -> Result<Option<(Vec<u8>, HashSet<Fingerprint>)>> {
@@ -272,9 +272,9 @@ fn validate_detached_signature(
} }
} }
fn keyring_from_peerstate(peerstate: &Option<Peerstate>) -> Keyring<SignedPublicKey> { pub(crate) fn keyring_from_peerstate(peerstate: Option<&Peerstate>) -> Keyring<SignedPublicKey> {
let mut public_keyring_for_validate: Keyring<SignedPublicKey> = Keyring::new(); let mut public_keyring_for_validate: Keyring<SignedPublicKey> = Keyring::new();
if let Some(ref peerstate) = *peerstate { if let Some(peerstate) = peerstate {
if let Some(key) = &peerstate.public_key { if let Some(key) = &peerstate.public_key {
public_keyring_for_validate.add(key.clone()); public_keyring_for_validate.add(key.clone());
} else if let Some(key) = &peerstate.gossip_key { } else if let Some(key) = &peerstate.gossip_key {

View File

@@ -18,7 +18,10 @@ use crate::blob::BlobObject;
use crate::constants::{DC_DESIRED_TEXT_LINES, DC_DESIRED_TEXT_LINE_LEN}; use crate::constants::{DC_DESIRED_TEXT_LINES, DC_DESIRED_TEXT_LINE_LEN};
use crate::contact::{addr_cmp, addr_normalize, ContactId}; use crate::contact::{addr_cmp, addr_normalize, ContactId};
use crate::context::Context; use crate::context::Context;
use crate::decrypt::{prepare_decryption, try_decrypt, DecryptionInfo}; use crate::decrypt::{
keyring_from_peerstate, prepare_decryption, try_decrypt, validate_detached_signature,
DecryptionInfo,
};
use crate::dehtml::dehtml; use crate::dehtml::dehtml;
use crate::events::EventType; use crate::events::EventType;
use crate::format_flowed::unformat_flowed; use crate::format_flowed::unformat_flowed;
@@ -64,7 +67,8 @@ pub struct MimeMessage {
/// If a message is not encrypted or the signature is not valid, /// If a message is not encrypted or the signature is not valid,
/// this set is empty. /// this set is empty.
pub signatures: HashSet<Fingerprint>, pub signatures: HashSet<Fingerprint>,
/// Whether the message is encrypted in a domestic (not Autocrypt) sense
pub encrypted: bool,
/// The set of mail recipient addresses for which gossip headers were applied, regardless of /// The set of mail recipient addresses for which gossip headers were applied, regardless of
/// whether they modified any peerstates. /// whether they modified any peerstates.
pub gossiped_addr: HashSet<String>, pub gossiped_addr: HashSet<String>,
@@ -232,91 +236,95 @@ impl MimeMessage {
hop_info += &decryption_info.dkim_results.to_string(); hop_info += &decryption_info.dkim_results.to_string();
// `signatures` is non-empty exactly if the message was encrypted and correctly signed. // `signatures` is non-empty exactly if the message was encrypted and correctly signed.
let (mail, signatures, warn_empty_signature) = let (mail, signatures, encrypted) = match try_decrypt(context, &mail, &decryption_info)
match try_decrypt(context, &mail, &decryption_info).await { .await
Ok(Some((raw, signatures))) => { {
// Encrypted, but maybe unsigned message. Only if Ok(Some((raw, signatures))) => {
// `signatures` set is non-empty, it is a valid // Encrypted, but maybe unsigned message. Only if
// autocrypt message. // `signatures` set is non-empty, it is a valid
// autocrypt message.
mail_raw = raw; mail_raw = raw;
let decrypted_mail = mailparse::parse_mail(&mail_raw)?; let decrypted_mail = mailparse::parse_mail(&mail_raw)?;
if std::env::var(crate::DCC_MIME_DEBUG).is_ok() { if std::env::var(crate::DCC_MIME_DEBUG).is_ok() {
info!(context, "decrypted message mime-body:"); info!(context, "decrypted message mime-body:");
println!("{}", String::from_utf8_lossy(&mail_raw)); println!("{}", String::from_utf8_lossy(&mail_raw));
} }
// Handle any gossip headers if the mail was encrypted. See section // Handle any gossip headers if the mail was encrypted. See section
// "3.6 Key Gossip" of <https://autocrypt.org/autocrypt-spec-1.1.0.pdf> // "3.6 Key Gossip" of <https://autocrypt.org/autocrypt-spec-1.1.0.pdf>
// but only if the mail was correctly signed: // but only if the mail was correctly signed:
if !signatures.is_empty() { if !signatures.is_empty() {
let gossip_headers = let gossip_headers = decrypted_mail.headers.get_all_values("Autocrypt-Gossip");
decrypted_mail.headers.get_all_values("Autocrypt-Gossip"); gossiped_addr = update_gossip_peerstates(
gossiped_addr =
update_gossip_peerstates(context, message_time, &mail, gossip_headers)
.await?;
}
// let known protected headers from the decrypted
// part override the unencrypted top-level
// Signature was checked for original From, so we
// do not allow overriding it.
let mut signed_from = None;
// We do not want to allow unencrypted subject in encrypted emails because the user might falsely think that the subject is safe.
// See <https://github.com/deltachat/deltachat-core-rust/issues/1790>.
headers.remove("subject");
MimeMessage::merge_headers(
context, context,
&mut headers, message_time,
&mut recipients, &from.addr,
&mut signed_from, &mail,
&mut list_post, gossip_headers,
&mut chat_disposition_notification_to, )
&decrypted_mail.headers, .await?;
); }
if let Some(signed_from) = signed_from {
if addr_cmp(&signed_from.addr, &from.addr) {
from_is_signed = true;
} else {
// There is a From: header in the encrypted &
// signed part, but it doesn't match the outer one.
// This _might_ be because the sender's mail server
// replaced the sending address, e.g. in a mailing list.
// Or it's because someone is doing some replay attack
// - OTOH, I can't come up with an attack scenario
// where this would be useful.
warn!(
context,
"From header in signed part does't match the outer one"
);
}
}
(Ok(decrypted_mail), signatures, true) // let known protected headers from the decrypted
} // part override the unencrypted top-level
Ok(None) => {
// Message was not encrypted. // Signature was checked for original From, so we
// If it is not a read receipt, degrade encryption. // do not allow overriding it.
if let Some(peerstate) = &mut decryption_info.peerstate { let mut signed_from = None;
if message_time > peerstate.last_seen_autocrypt
&& mail.ctype.mimetype != "multipart/report" // We do not want to allow unencrypted subject in encrypted emails because the user might falsely think that the subject is safe.
// Disallowing keychanges is disabled for now: // See <https://github.com/deltachat/deltachat-core-rust/issues/1790>.
// && decryption_info.dkim_results.allow_keychange headers.remove("subject");
{
peerstate.degrade_encryption(message_time); MimeMessage::merge_headers(
peerstate.save_to_db(&context.sql).await?; context,
} &mut headers,
&mut recipients,
&mut signed_from,
&mut list_post,
&mut chat_disposition_notification_to,
&decrypted_mail.headers,
);
if let Some(signed_from) = signed_from {
if addr_cmp(&signed_from.addr, &from.addr) {
from_is_signed = true;
} else {
// There is a From: header in the encrypted &
// signed part, but it doesn't match the outer one.
// This _might_ be because the sender's mail server
// replaced the sending address, e.g. in a mailing list.
// Or it's because someone is doing some replay attack
// - OTOH, I can't come up with an attack scenario
// where this would be useful.
warn!(
context,
"From header in signed part does't match the outer one",
);
} }
(Ok(mail), HashSet::new(), false)
} }
Err(err) => {
warn!(context, "decryption failed: {}", err); (Ok(decrypted_mail), signatures, true)
(Err(err), HashSet::new(), true) }
Ok(None) => {
// Message was not encrypted.
// If it is not a read receipt, degrade encryption.
if let Some(peerstate) = &mut decryption_info.peerstate {
if message_time > peerstate.last_seen_autocrypt
&& mail.ctype.mimetype != "multipart/report"
// Disallowing keychanges is disabled for now:
// && decryption_info.dkim_results.allow_keychange
{
peerstate.degrade_encryption(message_time);
}
} }
}; (Ok(mail), HashSet::new(), false)
}
Err(err) => {
warn!(context, "decryption failed: {}", err);
(Err(err), HashSet::new(), true)
}
};
let mut parser = MimeMessage { let mut parser = MimeMessage {
parts: Vec::new(), parts: Vec::new(),
@@ -331,6 +339,7 @@ impl MimeMessage {
// only non-empty if it was a valid autocrypt message // only non-empty if it was a valid autocrypt message
signatures, signatures,
encrypted,
gossiped_addr, gossiped_addr,
is_forwarded: false, is_forwarded: false,
mdn_reports: Vec::new(), mdn_reports: Vec::new(),
@@ -385,7 +394,7 @@ impl MimeMessage {
// part.error = Some("Seems like DKIM failed, this either is an attack or (more likely) a bug in Authentication-Results checking. Please tell us about this at https://support.delta.chat.".to_string()); // part.error = Some("Seems like DKIM failed, this either is an attack or (more likely) a bug in Authentication-Results checking. Please tell us about this at https://support.delta.chat.".to_string());
// } // }
// } // }
if warn_empty_signature && parser.signatures.is_empty() { if encrypted && parser.signatures.is_empty() {
for part in parser.parts.iter_mut() { for part in parser.parts.iter_mut() {
part.error = Some("No valid signature".to_string()); part.error = Some("No valid signature".to_string());
} }
@@ -400,6 +409,13 @@ impl MimeMessage {
peerstate peerstate
.handle_fingerprint_change(context, message_time) .handle_fingerprint_change(context, message_time)
.await?; .await?;
// When peerstate is set to Mutual, it's saved immediately to not lose that fact in case
// of an error. Otherwise we don't save peerstate until get here to reduce the number of
// calls to save_to_db() and not to degrade encryption if a mail wasn't parsed
// successfully.
if peerstate.prefer_encrypt != EncryptPreference::Mutual {
peerstate.save_to_db(&context.sql).await?;
}
} }
Ok(parser) Ok(parser)
@@ -852,6 +868,26 @@ impl MimeMessage {
.parse_mime_recursive(context, first, is_related) .parse_mime_recursive(context, first, is_related)
.await?; .await?;
} }
if let Some(peerstate) = &mut self.decryption_info.peerstate {
let keyring = keyring_from_peerstate(Some(peerstate));
match validate_detached_signature(mail, &keyring) {
Ok(Some((_, fprints))) => {
if fprints.is_empty() {
warn!(context, "signed message is not signed with a known key");
} else if peerstate.prefer_encrypt != EncryptPreference::Mutual {
info!(
context,
"message is signed with the known key, setting \
prefer-encrypt=mutual for '{}'",
peerstate.addr,
);
Self::upgrade_to_mutual_encryption(context, peerstate).await?;
}
}
Ok(None) => warn!(context, "not a 'multipart/signed' part??"),
Err(err) => warn!(context, "signed message validation failed: {}", err),
}
}
} }
(mime::MULTIPART, "report") => { (mime::MULTIPART, "report") => {
/* RFC 6522: the first part is for humans, the second for machines */ /* RFC 6522: the first part is for humans, the second for machines */
@@ -929,6 +965,17 @@ impl MimeMessage {
Ok(any_part_added) Ok(any_part_added)
} }
async fn upgrade_to_mutual_encryption(
context: &Context,
peerstate: &mut Peerstate,
) -> Result<()> {
if peerstate.public_key.is_none() {
peerstate.public_key = peerstate.gossip_key.take();
}
peerstate.prefer_encrypt = EncryptPreference::Mutual;
peerstate.save_to_db(&context.sql).await
}
/// Returns true if any part was added, false otherwise. /// Returns true if any part was added, false otherwise.
async fn add_single_part_if_known( async fn add_single_part_if_known(
&mut self, &mut self,
@@ -1106,7 +1153,13 @@ impl MimeMessage {
if peerstate.prefer_encrypt != EncryptPreference::Mutual if peerstate.prefer_encrypt != EncryptPreference::Mutual
&& mime_type.type_() == mime::APPLICATION && mime_type.type_() == mime::APPLICATION
&& mime_type.subtype().as_str() == "pgp-keys" && mime_type.subtype().as_str() == "pgp-keys"
&& Self::try_set_peer_key_from_file_part(context, peerstate, decoded_data).await? && Self::try_set_peer_key_from_file_part(
context,
peerstate,
decoded_data,
self.encrypted,
)
.await?
{ {
return Ok(()); return Ok(());
} }
@@ -1196,6 +1249,7 @@ impl MimeMessage {
context: &Context, context: &Context,
peerstate: &mut Peerstate, peerstate: &mut Peerstate,
decoded_data: &[u8], decoded_data: &[u8],
mail_is_encrypted: bool,
) -> Result<bool> { ) -> Result<bool> {
let key = match str::from_utf8(decoded_data) { let key = match str::from_utf8(decoded_data) {
Err(err) => { Err(err) => {
@@ -1240,13 +1294,23 @@ impl MimeMessage {
return Ok(false); return Ok(false);
} }
} }
info!(
context,
"will use attached PGP key for peer '{}' with mutual encryption", peerstate.addr,
);
peerstate.public_key = Some(key); peerstate.public_key = Some(key);
peerstate.prefer_encrypt = EncryptPreference::Mutual; if mail_is_encrypted {
peerstate.save_to_db(&context.sql).await?; info!(
context,
"using attached PGP key for peer '{}' with prefer-encrypt=mutual as the mail is \
encrypted",
peerstate.addr,
);
peerstate.prefer_encrypt = EncryptPreference::Mutual;
peerstate.save_to_db(&context.sql).await?;
} else {
info!(
context,
"using attached PGP key for peer '{}'", peerstate.addr,
);
peerstate.prefer_encrypt = EncryptPreference::NoPreference;
}
Ok(true) Ok(true)
} }
@@ -1624,6 +1688,7 @@ impl MimeMessage {
async fn update_gossip_peerstates( async fn update_gossip_peerstates(
context: &Context, context: &Context,
message_time: i64, message_time: i64,
from: &str,
mail: &mailparse::ParsedMail<'_>, mail: &mailparse::ParsedMail<'_>,
gossip_headers: Vec<String>, gossip_headers: Vec<String>,
) -> Result<HashSet<String>> { ) -> Result<HashSet<String>> {
@@ -1641,7 +1706,7 @@ async fn update_gossip_peerstates(
if !get_recipients(&mail.headers) if !get_recipients(&mail.headers)
.iter() .iter()
.any(|info| info.addr == header.addr.to_lowercase()) .any(|info| addr_cmp(&info.addr, &header.addr))
{ {
warn!( warn!(
context, context,
@@ -1649,6 +1714,14 @@ async fn update_gossip_peerstates(
); );
continue; continue;
} }
if addr_cmp(from, &header.addr) {
// Non-standard, but anyway we can't update the cached peerstate here.
warn!(
context,
"Ignoring gossiped \"{}\" as it equals the From address", &header.addr,
);
continue;
}
let peerstate; let peerstate;
if let Some(mut p) = Peerstate::from_addr(context, &header.addr).await? { if let Some(mut p) = Peerstate::from_addr(context, &header.addr).await? {

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@@ -806,7 +806,6 @@ mod tests {
verified_key_fingerprint: None, verified_key_fingerprint: None,
fingerprint_changed: false, fingerprint_changed: false,
}; };
assert_eq!(peerstate.prefer_encrypt, EncryptPreference::NoPreference);
peerstate.apply_header(&header, 100); peerstate.apply_header(&header, 100);
assert_eq!(peerstate.prefer_encrypt, EncryptPreference::Mutual); assert_eq!(peerstate.prefer_encrypt, EncryptPreference::Mutual);

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@@ -5359,7 +5359,13 @@ Reply from different address
let raw = include_bytes!("../test-data/message/thunderbird_with_autocrypt_unencrypted.eml"); let raw = include_bytes!("../test-data/message/thunderbird_with_autocrypt_unencrypted.eml");
receive_imf(&t, raw, false).await?; receive_imf(&t, raw, false).await?;
let peerstate = Peerstate::from_addr(&t, "alice@example.org")
.await?
.unwrap();
assert_eq!(peerstate.prefer_encrypt, EncryptPreference::Mutual);
let raw = include_bytes!("../test-data/message/thunderbird_signed_unencrypted.eml");
receive_imf(&t, raw, false).await?;
let peerstate = Peerstate::from_addr(&t, "alice@example.org") let peerstate = Peerstate::from_addr(&t, "alice@example.org")
.await? .await?
.unwrap(); .unwrap();

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@@ -0,0 +1,56 @@
From - Thu, 15 Dec 2022 14:45:17 GMT
X-Mozilla-Status: 0801
X-Mozilla-Status2: 00000000
Message-ID: <db254c95-c23e-2ad5-14db-11ad1f374dbf@example.org>
Date: Thu, 15 Dec 2022 11:45:16 -0300
MIME-Version: 1.0
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101
Thunderbird/102.5.1
Content-Language: en-US
To: bob@example.net
From: Alice <alice@example.org>
Subject: test message 15:53
X-Mozilla-Draft-Info: internal/draft; vcard=0; receipt=0; DSN=0; uuencode=0;
attachmentreminder=0; deliveryformat=0
X-Identity-Key: id3
Fcc: imap://alice%40example.org@in.example.org/Sent
Content-Type: multipart/signed; micalg=pgp-sha256;
protocol="application/pgp-signature";
boundary="------------iX39J1p7DOgblwacjo0e7jX7"
This is an OpenPGP/MIME signed message (RFC 4880 and 3156)
--------------iX39J1p7DOgblwacjo0e7jX7
Content-Type: multipart/mixed; boundary="------------WD4DG7TcI4p4lbzyM4toRaDw";
protected-headers="v1"
From: Alice <alice@example.org>
To: bob@example.net
Message-ID: <db254c95-c23e-2ad5-14db-11ad1f374dbf@example.org>
Subject: test message 15:53
--------------WD4DG7TcI4p4lbzyM4toRaDw
Content-Type: text/plain; charset=UTF-8; format=flowed
Content-Transfer-Encoding: base64
DQo=
--------------WD4DG7TcI4p4lbzyM4toRaDw--
--------------iX39J1p7DOgblwacjo0e7jX7
Content-Type: application/pgp-signature; name="OpenPGP_signature.asc"
Content-Description: OpenPGP digital signature
Content-Disposition: attachment; filename="OpenPGP_signature"
-----BEGIN PGP SIGNATURE-----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=6JTB
-----END PGP SIGNATURE-----
--------------iX39J1p7DOgblwacjo0e7jX7--

View File

@@ -1,142 +1,142 @@
From - Fri, 09 Dec 2022 13:16:11 GMT From - Wed, 14 Dec 2022 18:53:03 GMT
X-Mozilla-Status: 0801 X-Mozilla-Status: 0801
X-Mozilla-Status2: 00000000 X-Mozilla-Status2: 00000000
Message-ID: <0c8e3ffc-99ae-eb68-15b5-15c4d85a5c12@example.org> Message-ID: <87d75c7e-0f52-1335-e437-af605c09f954@example.org>
Date: Fri, 9 Dec 2022 10:16:11 -0300 Date: Wed, 14 Dec 2022 15:53:03 -0300
MIME-Version: 1.0 MIME-Version: 1.0
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101
Thunderbird/102.5.1 Thunderbird/102.5.1
Content-Language: en-US Content-Language: en-US
To: bob@example.net To: bob@example.net
From: Alice <alice@example.org> From: Alice <alice@example.org>
Subject: test message 10:15 Subject: test message 15:52
Autocrypt: addr=alice@example.org; keydata= Autocrypt: addr=alice@example.org; keydata=
xsDNBGOTM3UBDADZ819boOPXK/ZPO1EepYUBve2psYO3rZkPu3uhyn7qpI8c0U5IbR+mAXPH xsDNBGOaGzQBDADCFtBNMHRDJQRkd2tNm7CJm1Yo3Y5r3qP6v0FSwP1BIHbiIf0E/jFiKZWj
FkKfvSwTtGiPpXaP6/vx0OjTs1aR7We9MrP+1EckbsyQnnDmDGsGxxyn3+a3ar0FcgOBi/kS 1uL68J2mGUuUu+Qi4ovf1l9/QQYzg/DCaLZxlbc0LKu2LXcpUL5DPu37mdw+DKs0YvNIlc+A
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attachmentreminder=0; deliveryformat=0 attachmentreminder=0; deliveryformat=0
X-Identity-Key: id3 X-Identity-Key: id3
Fcc: imap://alice%40example.org@in.example.org/Sent Fcc: imap://alice%40example.org@in.example.org/Sent
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This is an OpenPGP/MIME signed message (RFC 4880 and 3156) This is an OpenPGP/MIME signed message (RFC 4880 and 3156)
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protected-headers="v1" protected-headers="v1"
From: Alice <alice@example.org> From: Alice <alice@example.org>
To: bob@example.net To: bob@example.net
Message-ID: <0c8e3ffc-99ae-eb68-15b5-15c4d85a5c12@example.org> Message-ID: <87d75c7e-0f52-1335-e437-af605c09f954@example.org>
Subject: test message 10:15 Subject: test message 15:52
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Content-Disposition: attachment; filename="OpenPGP_signature" Content-Disposition: attachment; filename="OpenPGP_signature"
-----BEGIN PGP SIGNATURE----- -----BEGIN PGP SIGNATURE-----
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-----END PGP SIGNATURE----- -----END PGP SIGNATURE-----
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