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162 lines
5.2 KiB
Plaintext
162 lines
5.2 KiB
Plaintext
The contents of this file are subject to the Mozilla Public
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License Version 1.1 (the "License"); you may not use this file
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except in compliance with the License. You may obtain a copy of
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the License at http://www.mozilla.org/MPL/
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Software distributed under the License is distributed on an "AS
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IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
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implied. See the License for the specific language governing
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rights and limitations under the License.
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The Original Code is the Netscape security libraries.
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The Initial Developer of the Original Code is Netscape
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Communications Corporation. Portions created by Netscape are
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Copyright (C) 1994-2000 Netscape Communications Corporation. All
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Rights Reserved.
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Contributor(s):
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Alternatively, the contents of this file may be used under the
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terms of the GNU General Public License Version 2 or later (the
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"GPL"), in which case the provisions of the GPL are applicable
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instead of those above. If you wish to allow use of your
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version of this file only under the terms of the GPL and not to
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allow others to use your version of this file under the MPL,
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indicate your decision by deleting the provisions above and
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replace them with the notice and other provisions required by
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the GPL. If you do not delete the provisions above, a recipient
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may use your version of this file under either the MPL or the
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GPL.
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SSL's Buffers: enumerated and explained.
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---------------------------------------------------------------------------
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incoming:
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gs = ss->gather
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hs = ss->ssl3->hs
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gs->inbuf SSL3 only: incoming (encrypted) ssl records are placed here,
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and then decrypted (or copied) to gs->buf.
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gs->buf SSL2: incoming SSL records are put here, and then decrypted
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in place.
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SSL3: ssl3_HandleHandshake puts decrypted ssl records here.
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hs.msg_body (SSL3 only) When an incoming handshake message spans more
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than one ssl record, the first part(s) of it are accumulated
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here until it all arrives.
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hs.msgState (SSL3 only) an alternative set of pointers/lengths for gs->buf.
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Used only when a handleHandshake function returns SECWouldBlock.
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ssl3_HandleHandshake remembers how far it previously got by
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using these pointers instead of gs->buf when it is called
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after a previous SECWouldBlock return.
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---------------------------------------------------------------------------
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outgoing:
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sec = ss->sec
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ci = ss->sec->ci /* connect info */
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ci->sendBuf Outgoing handshake messages are appended to this buffer.
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This buffer will then be sent as a single SSL record.
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sec->writeBuf outgoing ssl records are constructed here and encrypted in
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place before being written or copied to pendingBuf.
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ss->pendingBuf contains outgoing ciphertext that was saved after a write
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attempt to the socket failed, e.g. EWouldBlock.
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Generally empty with blocking sockets (should be no incomplete
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writes).
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ss->saveBuf Used only by socks code. Intended to be used to buffer
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outgoing data until a socks handshake completes. However,
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this buffer is always empty. There is no code to put
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anything into it.
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---------------------------------------------------------------------------
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SECWouldBlock means that the function cannot make progress because it is
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waiting for some event OTHER THAN socket I/O completion (e.g. waiting for
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user dialog to finish). It is not the same as EWOULDBLOCK.
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---------------------------------------------------------------------------
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Rank (order) of locks
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[ReadLock ->]\ [firstHandshake ->] [ssl3Handshake ->] recvbuf \ -> "spec"
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[WriteLock->]/ xmitbuf /
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crypto and hash Data that must be protected while turning plaintext into
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ciphertext:
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SSL2: (in ssl2_Send*)
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sec->hash*
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sec->hashcx (ptr and data)
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sec->enc
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sec->writecx* (ptr and content)
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sec->sendSecret*(ptr and content)
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sec->sendSequence locked by xmitBufLock
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sec->blockSize
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sec->writeBuf* (ptr & content) locked by xmitBufLock
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"in" locked by xmitBufLock
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SSl3: (in ssl3_SendPlainText)
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ss->ssl3 (the pointer)
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ss->ssl3->current_write* (the pointer and the data in the spec
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and any data referenced by the spec.
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ss->sec->isServer
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ss->sec->writebuf* (ptr & content) locked by xmitBufLock
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"buf" locked by xmitBufLock
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crypto and hash data that must be protected while turning ciphertext into
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plaintext:
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SSL2: (in ssl2_GatherData)
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gs->* (locked by recvBufLock )
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sec->dec
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sec->readcx
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sec->hash* (ptr and data)
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sec->hashcx (ptr and data)
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SSL3: (in ssl3_HandleRecord )
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ssl3->current_read* (the pointer and all data refernced)
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ss->sec->isServer
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Data that must be protected while being used by a "writer":
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ss->pendingBuf.*
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ss->saveBuf.* (which is dead)
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in ssl3_sendPlainText
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ss->ssl3->current_write-> (spec)
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ss->sec->writeBuf.*
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ss->sec->isServer
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in SendBlock
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ss->sec->hash->length
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ss->sec->blockSize
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ss->sec->writeBuf.*
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ss->sec->sendSecret
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ss->sec->sendSequence
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ss->sec->writecx *
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ss->pendingBuf
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--------------------------------------------------------------------------
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Data variables (not const) protected by the "sslGlobalDataLock".
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Note, this really should be a reader/writer lock.
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allowedByPolicy sslcon.c
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maybeAllowedByPolicy sslcon.c
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chosenPreference sslcon.c
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policyWasSet sslcon.c
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cipherSuites[] ssl3con.c
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