Instead of interpreting a "-" at the beginning of a line as
an error response, consider the absence of a "+" at the
beginning of a line as an error response.
This is what Thunderbird does.
http://hg.mozilla.org/releases/comm-esr24/file/55e96a433bd1/mailnews/local/src/nsPop3Protocol.cpp#l1177
The problem arises with godaddy servers spewing additional
lines of data upon login failure. The login was being
interpreted as successful, and a STAT commanded was subsequently
being sent, resulting in a dialog saying 'Cannot connect to
server. (Invalid int: "auth_error:")'.
$ openssl s_client -quiet -crlf -connect pop.secureserver.net:995
...
+OK <24984.1394317012@pop.secureserver.net>
user testuser
+OK
pass testpass
testuser not found in the auth database
warning: auth_error: authorization failed (no such object)
-ERR authorization failed Check your server settings.
Some IMAP servers are broken and don't correctly handle string
literals with the LOGIN command.
This switches to using quoted strings instead.
This is what Thunderbird does.
Error messages were not being put in the folder because of a problem with
how loopCatch was being handled.
It looks like this problem goes back to commit 5aea9e7.
Additional device info has been added to the error messages.
Also, now the feature is only enabled in debug mode.
getName() shows the user's name from the first identity for the account.
What we really want is getDescription(), which is the account name that
shows in the account list.
If an error occurs while connecting for push (for example, if the server's
certificate fails authentication), several more attempts will be made to
connect, then finally all attempts will cease.
This commit makes it so that pushers are restarted if the user goes in and
edits the server settings (presumably because the user was notified of a
problem and is attempting to fix it). Without this, the user could fix
the problem and would still not receive email via push.
These options originated in the AOSP email client from which K-9 Mail was
forked. They provide an odd combination of 2 features:
1. Don't bother to authenticate the server's certificate (applies to both
SSL/TLS and STARTTLS); i.e., blindly accept all certificates. This is
generally a bad security policy which is susceptible to MITM attacks.
2. If STARTTLS is selected but the server doesn't claim to support
STARTTLS, then proceed without using encryption. This, too, is a bad
security policy which is susceptible to MITM attacks.
Since the time that K-9 Mail was forked, a couple things have changed:
> K-9 Mail has implemented the ability for users to review and permanently
accept individual certificates that would otherwise fail authentication.
With this ability, there is no need for a user to subject themselves to
the ongoing risks of feature 1. above. Hence, this commit removes feature
1.
> The AOSP email client has changed its behavior and no longer permits a
security downgrade to an unencrypted connection if the server doesn't
claim to support STARTTLS (i.e., they eliminated feature 2. above). K-9
Mail should do the same. It's unlikely that a server is going to provide
STARTTLS on an intermittent basis, so providing a contingency for such
unusual behavior is an unnecessary risk. Hence, this commit removes that
feature as well.
Effect on existing users:
If the old connection security setting was "SSL/TLS (if available)" (which
now gets remapped to "SSL/TLS"), and the server does not provide a
certificate that can be authenticated, then a "Certificate error for
<account name>" notification is generated telling the user to check their
server settings. Tapping the notification takes the user to the relevant
server settings, where the user can tap "Next" to review the certificate
and choose to permanently accept it. This process would occur during the
first syncing of folders after application upgrade or (in the case of
SMTP) during the first attempt to send a message.
If the connection security setting was "STARTTLS (if available)" (which
now gets remapped to "STARTTLS"), and the server does not provide a
certificate that can be authenticated, then the same process as above
would occur.
If the old connection security setting was "STARTTLS (if available)", and
the server doesn't claim to support STARTTLS, then the user would get a
certificate error notification which would lead them to the server's
settings. There they would need to choose a different connection security
-- most likely "NONE". If they didn't change anything but instead just
tapped "Next", the server settings would be checked again and a dialog
would pop up saying, "Cannot connect to server. (STARTTLS connection
security not available)". (The implementation of notifications when
STARTTLS is not available is not actually included here -- it's in the
commit that follows.)
Regarding the changes to providers.xml: in cases where the scheme ended
with "+ssl", the schemes were simply updated by appending "+". In cases
where the scheme ended with "+tls", a check of the server was made to
assure that STARTTLS was available before appending "+" to the scheme.
Domains paran.com and nate.com failed the check and were removed because
no current information could be found. Domains me.com and mac.com also
failed and were updated based on http://support.apple.com/kb/ht4864.
Previously, if a server's certificate failed authentication while
connecting for push (if, for example, the certificate had expired), then
the attempt to connect would fail, and another attempt would be tried
later. After a certain number of failed attempts, no further attempts
would be made. Meanwhile, the user is oblivious to the failures, and it
could be quite some time before the user realizes that they are not
getting email. Even when they do realize it, they would not know the
cause.
With this commit, users receive a notification when such failures occur
while connecting for push. (These notifications are already generated
with failures while polling.) Tapping the notification will take the user
to the relevant server settings where they can choose to accept the
certificate.
Applicable for strings not intended for user consumption.
A %d string format code can generate eastern-arabic numerals
for users with an arabic locale.
V/k9 (20763): conn1103774136>>> 5 UID SEARCH ٦٤٦:٦٧٠ NOT DELETED
V/k9 (20763): conn1103774136<<<#5# [BAD, Invalid Search criteria]
E/k9 (20763): synchronizeMailbox
E/k9 (20763): com.fsck.k9.mail.store.ImapStore$ImapException: Command: UID SEARCH ٦٤٦:٦٧٠ NOT DELETED; response: #5# [BAD, Invalid Search criteria]
When sending a command it would be sent like this:
PKG1: 1 STARTTLS
PKG2: \r\n
Some imap proxys (maybe from Fortinet?) don't accept commands across packets:
PKG1: 1 STARTTLS\r\n
The naturalize tool detected that using "identity" is more consistent
with the current codebase state:
* "identity" in SettingsImporter is 78.46% probable ("identitiy" 21.54%)
The naturalize tool detected that using "tokenizer" is more consistent
with the current codebase state:
* "tokenizer" in MessageCompose is 60.40% probable ("tokens" 39.60%)
The naturalize tool detected that using "localFolder" is more consistent
with the current codebase state:
* "localFolder" in MessageListFragment is 76.31% probable ("local_folder" 23.69%)
The naturalize tool detected that using "sizeParam" is more consistent
with the current codebase state:
* "sizeParam" in LocalStore is 22.89% probable ("s" 10.52%)
The naturalize tool detected that using "uee" is more consistent with
the current codebase state:
* "uee" in LocalStore is 28.47% probable ("usee" 5.01%)
* "uee" in TextBody is 45.02% probable ("usee" 9.10%)
If the user chooses a connection security option which assures the use of
encryption, then the PLAIN auth. option is labeled "Normal password",
otherwise it is labeled "Password, transmitted insecurely".
This is similar to Thunderbird's behavior.
The server settings for IMAP and POP3 have no such AUTOMATIC setting.
(Nor does Thunderbird have any such setting.)
The AUTOMATIC option is no longer offered to users as a choice. A
pre-existing setting will continue to be honored, but only to the extent
that it doesn't result in insecure password transmission. Users in such a
situation will get a "Failed to send some messages" notification
containing the exception text that says to update their outgoing server
authentication setting.
One of the problems with "AUTOMATIC" is that users may not fully
understand its security implications. For example, a MITM attack could
mask a server's support for STARTTLS and CRAM-MD5, resulting in password
disclosure in certain configurations.
This commit also makes changes to the SMTP authentication process. No
attempt is made to authenticate using methods that the server does not
profess to support in its EHLO response. This is the same behavior as
found in Thunderbird.
The LOGIN option is no longer offered to users as a choice. This does
*not* eliminate the SASL LOGIN authentication mechanism. Any pre-existing
LOGIN setting or any imported LOGIN setting will still be recognized. In
all cases, a user setting of either "Normal password" or "LOGIN" will
result in the SASL PLAIN mechanism being tried first if available,
otherwise SASL LOGIN will be tried if available.
This mirrors similar behavior that exists for IMAP.
AUTOMATIC = "Automatic"
PLAIN = "Normal password"
CRAM_MD5 = "Encrypted password"
SMTP also uses LOGIN. No localized text was associated with that because
a future commit will remove that option.
(The text is similar to that of Thunderbird's)
Changes:
Extract code and create login() and authCramMD5() methods.
Implement the SASL PLAIN authentication mechanism. Its primary benefit is
the explicit support for UTF-8. If the user has configured "PLAIN"
authentication, then SASL PLAIN will be used, if available, otherwise
login() will be used.
Implement POP3 APOP authentication (issue 3218). If the user has
configured "CRAM_MD5" authentication (a future commit will change this
user option to a localized string "Encrypted password"), then SASL
CRAM-MD5 will be used, if available, otherwise the availability of POP3
APOP will be checked and used (per RFC 2449, there is no APOP
"capability").
Extend getCapabilities() to check for available authentication methods by
sending the "AUTH" command with no arguments
(http://tools.ietf.org/html/draft-myers-sasl-pop3-05). This never became
a standard, but there are servers that support it, and Thunderbird
includes this check.
The SASL PLAIN and CRAM-MD5 authentication methods are not attempted
unless the server professes to have the appropriate capability.
(Previously, CRAM-MD5 was tried regardless of capability.) No check is
made for the USER capability prior to use of that method. All this is the
same behavior as in Thunderbird.
Eliminate the testing for capabilities in cases where the test results are
never used (PIPELINING, USER).
Change when getCapabilities() is called. It is called once upon
connection. If STARTTLS is negotiated (POP3 STLS), then
getCapabilities() is called again after the connection is encrypted (and
the server is authenticated), but before user authentication is attempted.
In AccountSetupCheckSettings.onCreate(Bundle), the account settings are
checked.
If an AuthenticationFailedException occurs, A dialog saying "Username or
password incorrect." pops up. We don't want to say this if the cause is
not related to an incorrect user name or password. Instead we want to say
the more generic "Cannot connect to server" which pops up for other
exception types.
This commit attempts to eliminate the use of AuthenticationFailedException
in instances where it could not be due to "Username or password
incorrect."
Previously, the user name and password were being transmitted as IMAP (RFC
3501) quoted strings.
The problem is that quoted strings are only permitted to carry 7-bit
(ASCII) data, whereas user names and passwords entered in K-9 Mail may not
be ASCII, so K-9 was violating the RFC by sending them as quoted strings.
The solution is to transmit the credentials as IMAP literal strings, which
are permitted for user names and passwords, and which permit the
transmission of 8-bit data.
This is only a partial attempt for fixing the LOGIN command for users with
non-ASCII credentials. The problem is that IMAP permits 8-bit data for
user names and passwords (if transmitted as literals), but the RFC says
nothing about the character encoding for 8-bit data. This commit encodes
them as UTF-8.
The RFC author's comments on the subject:
http://mailman2.u.washington.edu/pipermail/imap-protocol/2008-February/000822.html
Ideally, users should avoid the LOGIN command and use the SASL PLAIN
mechanism (within TLS) which explicitly permits UTF-8. (K-9 Mail always
chooses PLAIN over LOGIN, when PLAIN is available.)
CRAM-MD5 (RFC 2195) permits 8-bit data but does not identify its encoding.
Since ASCII does not permit 8-bit data, this commit changes the encoding
to UTF-8.
There is an expired Internet-Draft that proposed that the RFC be changed
to explicitly require UTF-8 encoding of user names and shared secrets.
(But then there's also an expired draft proposing that CRAM-MD5 be retired
to historic status.)
Instead of CRAM-MD5, a better option for users is the SASL PLAIN mechanism
(within TLS) which explicitly permits UTF-8.
See Issue 4492
This method made way too many assumptions about server responses and
should not have been attempting to read and parse them. That should be
left to ImapResponseParser.
Changes:
Implement the PLAIN SASL mechanism. IMAPv4rev1 assures its availability
so long as the connection is encrypted. The big advantage of PLAIN over
IMAP "LOGIN" is that PLAIN uses UTF-8 encoding for the user name and
password, whereas "LOGIN" is only safe for 7-bit US-ASCII -- the encoding
of 8-bit data is undefined.
(Note that RFC 6855 says that IMAP "LOGIN" does not support UTF-8, and
clients must use IMAP "AUTHENTICATE" to pass UTF-8 user names and
passwords.)
Honor the "LOGINDISABLED" CAPABILITY (RFC 2595) when the server declares
it. There's no sense transmitting a password in the clear when it is
known that it will be rejected.
No attempt is made to try CRAM-MD5 if the server doesn't profess to
support it in its CAPABILITY response. (This is the same behavior as
Thunderbird.)
Extract code from ImapConnection.open into new method
ImapConnection.login.
Extract code from ImapConnection.executeSimpleCommand into new method
ImapConnection.readStatusResponse.
Related issues: 6015, 6016
All \r and \n codes have been replaced with <br />, so the patterns in
these replacements don't match anything.
This problem has existed for some time -- since commits 1ea27d7 and
e12dd32.
No attempt is made here to reimplement the replacements because users are
now used to the current behavior without much apparent complaint, and such
replacements are never perfect and can occasionally fail to work as
desired without additional tweaking for special cases.
There's currently a bug in linkifyText() that can lead to a
StringIndexOutOfBoundsException when the text contains a
bitcoin URI and a "web" URI near the end of the text.
The loop extracted keys from `folderMap` and then called
`folderMap.get(...)` for every key. If both the key and the value needs
to be iterated on, `Map.entrySet()` is a more efficient solution as it
doesn't require O(n) Map lookups.
Since id is a Long, Long.valueOf(long) unboxed the Long to a primitive
long, then reboxed it into a Long instance, which was again unboxed to
allow it to be set as an element of the array of longs. This commit
reduces the number of boxings from 3 to 1.
Under certain circumstances it's possible that the 'push state' isn't
updated to contain the most recent 'UIDNEXT' value. In that case
ImapFolderPusher.start() would execute the same code path through its
main loop over and over again, preventing the device from going to
sleep.
Rather than changing the code to update the 'push state' in the corner
case that triggers the behavior described above, this commit introduces
another mechanism to track the 'UIDNEXT' value. This should also catch
as of yet unknown cases where the 'push state' isn't properly updated.
At some point in the future I hope we get to a point where we only
persist the 'push state' when we manually stop/restart the service.
During normal operation there's no need to read from/write to storage
all the time.
Fixes issue 4907
When message viewing and tap the next icon, menu icons (previous, next, delete and replys) disappears for an instant.
But a compose icon remains, then tap it accidentally.
Eliminate the invocation of
WebSettings.setBlockNetworkImage(boolean flag),
thus maintaining the the default setting of "false".
On Android versions prior to KitKat, this setting has no
effect on inline image attachments loaded with content:
URIs. Such images would load regardless.
With KitKat, this setting does have an effect -- a
setting of "true" will block image attachments loaded
with content: URIs.
By removing this call, K-9 Mail behaves the same on KitKat
as on earlier Android versions, and the behavior on earlier
versions is unchanged.
The minSdkVersion was recently increased from 8 to 15.
WebSettings.setBlockNetworkLoads has been publicly available
since API level 8 (Froyo).
StrictMode has been publicly available since API level 9
(Gingerbread).
Also, include the sent-date in the header when using
the "prefix" quote style. "Be like mutt" (and gmail,
and thunderbird)
Also, the quoteOriginalHtmlMessage method was using the mSourceMessage
field in various places when it should be using its originalMessage
parameter.
Related issues: 2249, 3456
There were a number of preferences that were not being removed
from the preferences DB when an account was deleted, so they
would remain there forever.
There were a few attempts to remove preference keys from the DB where
the keys were obsolete and not in use for some time.
Certain obsolete preferences were not modified:
mUuid + ".name"
mUuid + ".email"
mUuid + ".signature"
mUuid + ".signatureUse"
These were in use before implementing multiple identities, and are still used
as a fallback for old accounts without multiple identities configured.
The error reporting assures an exception is thrown if
setKeyStoreFile(null) is called without a prior call to
setKeyStoreLocation(String directory).
Also, fix TrustManagerFactoryTest indentation.
Blacklist a couple of weak ciphers, bring known ones in a defined order and sort unknown
ciphers at the end. Also re-enable SSLv3 because it's still used a lot.
Instead, have K9.onCreate initialize the location of the key
store file (similar to what is done with
BinaryTempFileBody.setTempDirectory).
Also, LocalKeyStore.getInstance has been changed so that it
no longer needs to be synchronized.
Implement an "upgrade" capability for the key store file,
and then use it to delete the old file.
The existing certs in the old file are not a security
risk, but they are now useless because the format of
their aliases was changed in commit a4440b4. They now are
just taking up storage space and memory.
Users will need to re-accept *ALL* certificates that they had
previously accepted and are still using. (Actually, this requirement
was effective with commit 4b57d79a. Before that, certificates whose
Subject matched did not require re-accepting.)
The classes are just as much related to com.fsck.k9.mail.transport
as com.fsck.k9.mail.store, so having them in
com.fsck.k9.mail.store doesn't seem appropriate.
Move LocalKeyStore to com.fsck.k9.security
Move TrustManagerFactory and TrustedSocketFactory to com.fsck.k9.net.ssl
Also, implement the ability to configure an alternate key store
file location. This permits the running of unit tests without
clobbering the live key store file.
Also, add a test to confirm that the key store file is being written
out and reread correctly.
Proper host name validation was not being performed for certificates
kept in the local keystore. If an attacker could convince a user to
accept and store an attacker's certificate, then that certificate
could be used for MITM attacks, giving the attacker access to all
connections to all servers in all accounts in K-9.
This commit changes how the certificates are stored. Previously, an
entire certificate chain was stored for a server (and any of those
certificates in the chain were available for validating signatures on
certificates received when connecting). Now just the single
certificate for the server is stored.
This commit changes how locally stored certificates are retrieved.
They can only be retrieved using the host:port that the user
configured for the server.
This also fixes issue 1326. Users can now use different certificates
for different servers on the same host (listening to different ports).
The above changes mean that users might have to re-accept certificates
that they had previously accepted and are still using (but only if the
certificate's Subject doesn't match the host that they are connecting
to).
This commit modifies AccountSetupBasics so that it now calls
AccountSetupCheckSettings twice -- once for checking the incoming
settings and once for the outgoing settings. Otherwise, an exception
could occur while checking incoming settings, the user could say
continue (or the user could accept a certificate key), and the
outgoing settings would not be checked. This also helps with
determining if a certificate exception was for the incoming or
outgoing server, which is needed if the user decides to add the
certificate to the keystore.
The TrustedSocketFactory, which provides goodies like better cipher suites and
TLSv1.2, was only being used for tunnelled connections. Use it for STARTTLS
connections as well.
Implement methods missing in API 7
Fix coordinate reference frame mismatch. Touch events are
relative to the view display, whereas view children are relative
to the view.
Revert "Only Jelly Bean seems to have the auto-scroll issue"
This reverts commit a3802a7a8e.
Revert "Hack around WebView's initial auto-scrolling past the message header"
This reverts commit 8dcc769c50.
Conflicts:
src/com/fsck/k9/view/MessageWebView.java
This implements the AOSP Email solution for incorporating
a Webview inside a ScrollView, while still being able to
scroll diagonally.
This replaces the functionality of TitleBarWebView (which
is now removed).
As Georg Lukas wrote in his blog post about how Android handles TLS
handshake (http://op-co.de/blog/posts/android_ssl_downgrade/), an
explicit order of cipher suites and TLS versions must be supplied to
avoid having the weak (presumably broken) RC4 cipher at the top of the
preference list.
This commit adds the list included in the blog post to every TLS socket
creation, including IMAP, POP3 and SMTP, see Wireshark screenshots done
during testing at http://vsza.hu/k9mail-tls-hardening/
This string resource is used in two places -- both with and without the
linefeed at the end. Instead of having a linefeed in the string and
having the code remove it if not needed, the linefeed is now omitted from
the string and the code adds it if needed.
Also, the line ending is changed from \n to \r\n.
Also, the string in the DE and FR locales had linefeeds at the start that
were removed so they match all the other locales.
(The string in the zh-rTW locale was left alone, since it had no
linefeeds. It looks like that file has numerous instances where \n was
replaced with actual newlines, which is probably not correct.)
This builds upon the efforts started 2 commits back where \r\n is used for
all message text and \n is only used when the text is inside an
EolConvertingEditText widget.
Even with the fix in the parent commit, the X-K9mail-Identity header can
become invalid if, for example, a user creates a draft in K-9 Mail, then
edits the draft outside of K-9 Mail, then opens the draft again in K-9
Mail.
This commit assures that an invalid X-K9mail-Identity header will not
result in an IndexOutOfBoundsException.
The problem:
Configure the account (just an example -- problems can occur in other
configurations as well):
Message Format: HTML
Reply quoting style: Prefix
Quote message when replying: yes
Reply after quoted text: yes
Reply to a message that has a large quantity (20+) of \r\n scattered in
the body of its HTML version (not an unusual scenario).
Add a reply. Save the message as a draft. Go back & open the draft
again. A fatal IndexOutOfBoundsException occurs.
The cause:
When the draft was saved, the X-K9mail-Identity header was computed and
added to the message, then the text of the message was processed with
MimeUtility.fixDraftTextBody, replacing all occurrences of \r\n with \n in
the quoted message before being saved in LocalStore, thus invalidating the
X-K9mail-Identity header.
The fix:
Remove MimeUtility.fixDraftTextBody and implement
MessageCompose$EolConvertingEditText instead. Any message text placed in
an EolConvertingEditText widget is assured to have \n line endings. Any
message text extracted from an EolConvertingEditText widget is assured to
have \r\n line endings. The X-K9mail-Identity header will always be
computed correctly.
Issues thought to be related: 4782, 5010, 5634, 5725
As noted in some of the referenced issues, errors didn't always result in
a fatal exception, but instead with mixed up text.
Ref: commit f9a35aeaee
Clear out old/unrelated (previously bound) contactBadge info in
MessageListAdapter.bindView that could otherwise be displayed
when tapping on a contactBadge with no counterpartyAddress (may
require scrolling the message list up and down first before the
bug becomes evident).
Fixes assignment problems for emails sent by some issue tracking
systems, which send out mails with a fixed mail address on behalf of
different people.
Update LocalStore code to handle the newly introduced temporary files
for attachments
Conflicts:
res/values/strings.xml
src/com/fsck/k9/activity/MessageCompose.java
Android allows other apps to access protected content of an app without requesting the
necessary permission when the app returns an Intent with FLAG_GRANT_READ_URI_PERMISSION.
This regularly happens as a result of ACTION_GET_CONTENT, i.e. what we use to pick content
to be attached to a message. Accessing that content only works while the receiving activity
is running. Afterwards accessing the content throws a SecurityException because of the
missing permission.
This commit changes K-9 Mail's behavior to copy the content to a temporary file in K-9's
cache directory while the activity is still running.
Fixes issue 4847, 5821
This also fixes bugs related to the fact that K-9 Mail didn't save a copy of attached content
in the message database.
Fixes issue 1187, 3330, 4930
In addition to a couple of custom ROMs linking /dev/urandom to a non-writable
*random version, now Samsung's SELinux policy also prevents apps from opening
/dev/urandom for writing. Since we shouldn't need to write to /dev/urandom anyway
we now simply don't.
Don't convert the content-type to lower case in
MimeMessage.getContentType. The content-type may have optional parameters
that are case sensitive (boundary, name).
In removing the lower-case conversion from getContentType, a review was
made for inappropriate case-sensitive comparisons which use data obtained
with getContentType. The only ones found were in isMimeType in both
Message and MimeBodyPart.
Case-sensitive instances of isMimeType were made case-insensitive. Also,
isMimeType was moved from Message to MimeMessage for symmetry with
MimeBodyPart (MimeMessage & MimeBodyPart are similar and contain a good
bit of duplication such as this).
The unit test required fixing now that the case of the boundary text is
preserved.
References:
Commits 2c5186 and dc4002 added the toLowerCase to getContentType in
MimeMessage & MimeBodyPart (Issue 94).
Later, commit 50cd60 removed the toLowerCase addition from MimeBodyPart
(Issue 1289).
Fix the unit test to match.
All line endings in the unit test are now the same.
(Just for consistency. Not a big deal, since such problems are fixed when
the messages are run through EOLConvertingOutputStream.)
The preceding commit resulted in attachments of type message/rfc822 being
sent with 8bit encoding even when the SMTP server did not support
8BITMIME. This commit assures that messages will be converted to 7bit
when necessary.
A new interface CompositeBody was created that extends Body, and classes
Message and Multipart were changed from implementing Body to
CompositeBody. Additional classes BinaryTempFileMessageBody and
LocalAttachmentMessageBody were created (by extending BinaryTempFileBody
and LocalAttachmentBody, respectively), and they too implement
CompositeBody.
A CompositeBody is a Body containing a composite-type that can contain
subparts that may require recursive processing when converting from 8bit
to 7bit. The Part to which a CompositeBody belongs is only permitted to
use 8bit or 7bit encoding for the CompositeBody.
Previously, a Message was created so that it was 7bit clean by default
(even though that meant base64 encoding all attachments, including
messages). Then, if the SMTP server supported 8BITMIME,
Message.setEncoding("8bit") was called so that bodies of type TextBody
would been transmitted using 8bit encoding rather than quoted-printable.
Now, messages are created with 8bit encoding by default. Then, if the
SMTP server does not support 8BITMIME, Message.setUsing7bitTransport is
called to recursively convert the message and its subparts to 7bit. The
method setUsing7bitTransport was added to the interfaces Part and
CompositeBody.
setEncoding no longer iterates over parts in Multipart. That task belongs
to setUsing7bitTransport, which may in turn call setEncoding on the parts.
MimeUtility.getEncodingforType was created as a helper function for
choosing a default encoding that should be used for a given MIME type when
an attachment is added to a message (either while composing or when
retrieving from LocalStore).
setEncoding was implemented in MimeBodyPart to assure that the encoding
set in the Part's headers was the same as set for the Part's Body. (The
method already existed in MimeMessage, which has similarities with
MimeBodyPart.)
MimeMessage.parse(InputStream in, boolean recurse) was implemented so that
the parser could be told to recursively process nested messages read from
the InputStream, thus giving access to all subparts at any level that may
need to be converted from 8bit to 7bit.
The problem: Receive a message with an attachment of type message/rfc822
and forward it. When the message is sent, K-9 Mail uses base64 encoding
for the attachment. (Alternatively, you could compose a new message and
add such an attachment from a file using a filing-picking app, but that is
not 100% effective because the app may not choose the correct
message/rfc822 MIME type for the attachment.)
Such encoding is prohibited per RFC 2046 (5.2.1) and RFC 2045 (6.4). Only
8bit or 7bit encoding is permitted for attachments of type message/rfc822.
Thunderbird refuses to decode such attachments. All that is shown is the
base64 encoded body.
This commit implements LocalAttachmentBody.setEncoding. If an attachment
to a newly composed message is itself a message, then setEncoding("8bit")
is called, otherwise setEncoding("base64") is called for the attachment.
Similar behavior occurs when an attachment is retrieved from LocalStore.
The setEncoding method was added to the Body interface, since all
implementations of Body now declare the method.
The problem here differs from that in the preceding commit: Here, the
encoding problem occurs on sending, not on receipt. Here, the entire
message (headers and body) is base64 encoded, not just the body. Here,
the headers correctly identify the encoding used; it's just that the RFC
does not permit such encoding of attached messages. The problem here
could in fact occur in combination with the preceding problem.
Issue 5734 exemplifies the problem: receive a message with an attachment
of type message/rfc822 that doesn't use base64 encoding for the body of
the attached message. K-9 Mail incorrectly stores the attached message
locally with its original headers but using base64 encoding for the body.
A discrepancy thus exists between what the headers say about the encoding
of the body versus the actual encoding used. This is obvious when
attempting to view the attachment (either by using a compatible message
viewer available on the device or by saving the attachment to a file and
viewing the file contents).
The process: When a message with an attached sub-message is received,
Message.parse puts the attachment in a new MimeMessage with the
attachment's body in a BinaryTempFileBody. LocalFolder.saveAttachment
then calls Message.writeTo (which later calls BinaryTempFileBody.writeTo)
to place the entire attachment (headers and body) in a new file that will
become a LocalAttachmentBody. Until now, BinaryTempFileBody.writeTo
could only save the message body using base64 encoding.
This commit implements BinaryTempFileBody.setEncoding and assures that the
body is written out with the same encoding that was found in its headers.
Currently, K-9 Mail detects if an SMTP server supports 8BITMIME (RFC
6152), and if so, TextBody parts are sent with content-transfer-ecoding =
8bit. Otherwise, they are sent using quoted-printable.
This adds the required "BODY=8BITMIME" parameter to the MAIL command when
sending messages to servers that support 8BITMIME.
The new method is a little bit janky, but a little bit of jank is better than 2n
heavy SQL count queries per folder before we even show the folder list.
On my 200 folder account, display of the folder list activity drops from 10+s to
< 1s
If you attempted to use SSL to connect to a server that speaks
STARTTLS, you should get an SSL protocol error. Instead, you
were likely to get an "Unrecognized Certificate" error that shows
you an unrelated certificate chain and asks you to accept it or
reject it. Neither action would work because the actual problem
had nothing to do with certificates. The unrelated certificate
chain that popped up had been statically stored when validating
a prior connection to a different server.
With this patch, certificate chains are no longer stored statically
when validating server connections.
Issue 5886 is an example of a user experiencing this problem.
Deleting a message creates an entry in EmailProviderCache so
EmailProviderCacheCursor can skip the Cursor row during the time
it takes to update the database.
Previously EmailProviderCacheCursor.isLast() returned the wrong
result when the last row in the wrapped Cursor was hidden. This
lead to the crash in MergeCursor.
Fixes issue 5820
