mirror of http://galexander.org/git/simplesshd.git
parent
9d7c6ffbfb
commit
e9d95ce283
@ -1,6 +1,7 @@
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repo: d7da3b1e15401eb234ec866d5eac992fc4cd5878
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node: d2753238f35f2f80507d1241f03639a20285ef46
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node: 4b984c42372d01fcc2fd487c58af6a5aa65eb88e
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branch: default
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latesttag: DROPBEAR_2019.78
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latesttagdistance: 2
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changessincelatesttag: 2
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latesttag: github/main
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latesttag: github/master
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latesttagdistance: 1
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changessincelatesttag: 1
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@ -0,0 +1,75 @@
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# Developer Notes
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## Building
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See [INSTALL](INSTALL) for build instructions.
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[SMALL](SMALL) has hints for building smaller binaries, also see comments
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in default_options.h.
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## Debug printing
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Set `#define DEBUG_TRACE 1` in localoptions.h to enable a `-v` option
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for dropbear and dbclient. That prints various details of the session. For
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development running `dropbear -F -E` is useful to run in the foreground. You
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can set `#define DEBUG_NOFORK 1` to make dropbear a one-shot server, easy to
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run under a debugger.
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## Random sources
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Most cryptography requires a good random entropy source, both to generate secret
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keys and in the course of a session. Dropbear uses the Linux kernel's
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`getrandom()` syscall to ensure that the system RNG has been initialised before
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using it. On some systems there is insufficient entropy gathered during early
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boot - generating hostkeys then will block for some amount of time.
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Dropbear has a `-R` option to generate hostkeys upon the first connection
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as required - that will allow the system more time to gather entropy.
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## Algorithms
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Default algorithm lists are specified in [common-algo.c](common-algo.c).
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They are in priority order, the client's first matching choice is used
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(see rfc4253).
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Dropbear client has `-c` and `-m` arguments to choose which are enabled at
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runtime (doesn't work for server as of June 2020).
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Enabling/disabling algorithms is done in [localoptions.h](localoptions.h),
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see [default_options.h](default_options.h).
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## Style
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Source code is indented with tabs, width set to 4 (though width shouldn't
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matter much). Braces are on the same line as functions/loops/if - try
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to keep consistency with existing code.
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All `if` statements should have braces, no exceptions.
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Avoid using pointer arithmetic, instead the functions in
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[buffer.h](buffer.h) should be used.
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Some Dropbear platforms have old compilers.
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Variable declarations must be at the top of a scope and
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comments must be `/* */` rather than `//`.
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Pointer variables should be initialised to NULL - it can reduce the
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severity of bugs.
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## Third party code
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Libtomcrypt and libtommath are periodically synced from upstream, so
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avoid making changes to that code which will need to be maintained.
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Improvements can be sent upstream to the libtom project.
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## Non-root user
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Dropbear server will run fine as a non-root user, allowing logins only for
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that user. Password authentication probably won't work (can't read shadow
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passwords). You will need to create hostkeys that are readable.
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## Connection setup
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Dropbear implements first_kex_packet_follows to reduce
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handshake latency (rfc 4253 7.1). Some less common implementations don't
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handle that, it can be a cause of problems connecting. Note also that
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Dropbear may send several ssh packets within a single TCP packet - it's just a
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stream.
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@ -0,0 +1,148 @@
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/*
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* Dropbear SSH
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*
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* Copyright (c) 2002,2003 Matt Johnston
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* Copyright (c) 2020 by Vladislav Grishenko
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* All rights reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
|
||||
* of this software and associated documentation files (the "Software"), to deal
|
||||
* in the Software without restriction, including without limitation the rights
|
||||
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
||||
* copies of the Software, and to permit persons to whom the Software is
|
||||
* furnished to do so, subject to the following conditions:
|
||||
*
|
||||
* The above copyright notice and this permission notice shall be included in
|
||||
* all copies or substantial portions of the Software.
|
||||
*
|
||||
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
||||
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
||||
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
||||
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
||||
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
||||
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
|
||||
* SOFTWARE. */
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#include "includes.h"
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#include "algo.h"
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#include "dbutil.h"
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#include "chachapoly.h"
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#if DROPBEAR_CHACHA20POLY1305
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#define CHACHA20_KEY_LEN 32
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#define CHACHA20_BLOCKSIZE 8
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#define POLY1305_KEY_LEN 32
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#define POLY1305_TAG_LEN 16
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static const struct ltc_cipher_descriptor dummy = {.name = NULL};
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static const struct dropbear_hash dropbear_chachapoly_mac =
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{NULL, POLY1305_KEY_LEN, POLY1305_TAG_LEN};
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const struct dropbear_cipher dropbear_chachapoly =
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{&dummy, CHACHA20_KEY_LEN*2, CHACHA20_BLOCKSIZE};
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static int dropbear_chachapoly_start(int UNUSED(cipher), const unsigned char* UNUSED(IV),
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const unsigned char *key, int keylen,
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int UNUSED(num_rounds), dropbear_chachapoly_state *state) {
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int err;
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TRACE2(("enter dropbear_chachapoly_start"))
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if (keylen != CHACHA20_KEY_LEN*2) {
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return CRYPT_ERROR;
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}
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if ((err = chacha_setup(&state->chacha, key,
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CHACHA20_KEY_LEN, 20)) != CRYPT_OK) {
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return err;
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}
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if ((err = chacha_setup(&state->header, key + CHACHA20_KEY_LEN,
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CHACHA20_KEY_LEN, 20) != CRYPT_OK)) {
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return err;
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}
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TRACE2(("leave dropbear_chachapoly_start"))
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return CRYPT_OK;
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}
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static int dropbear_chachapoly_crypt(unsigned int seq,
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const unsigned char *in, unsigned char *out,
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unsigned long len, unsigned long taglen,
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dropbear_chachapoly_state *state, int direction) {
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poly1305_state poly;
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unsigned char seqbuf[8], key[POLY1305_KEY_LEN], tag[POLY1305_TAG_LEN];
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int err;
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TRACE2(("enter dropbear_chachapoly_crypt"))
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if (len < 4 || taglen != POLY1305_TAG_LEN) {
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return CRYPT_ERROR;
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}
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STORE64H((uint64_t)seq, seqbuf);
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chacha_ivctr64(&state->chacha, seqbuf, sizeof(seqbuf), 0);
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if ((err = chacha_keystream(&state->chacha, key, sizeof(key))) != CRYPT_OK) {
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return err;
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}
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poly1305_init(&poly, key, sizeof(key));
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if (direction == LTC_DECRYPT) {
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poly1305_process(&poly, in, len);
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poly1305_done(&poly, tag, &taglen);
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if (constant_time_memcmp(in + len, tag, taglen) != 0) {
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return CRYPT_ERROR;
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}
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}
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chacha_ivctr64(&state->header, seqbuf, sizeof(seqbuf), 0);
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if ((err = chacha_crypt(&state->header, in, 4, out)) != CRYPT_OK) {
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return err;
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}
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chacha_ivctr64(&state->chacha, seqbuf, sizeof(seqbuf), 1);
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if ((err = chacha_crypt(&state->chacha, in + 4, len - 4, out + 4)) != CRYPT_OK) {
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return err;
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}
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if (direction == LTC_ENCRYPT) {
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poly1305_process(&poly, out, len);
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poly1305_done(&poly, out + len, &taglen);
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}
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TRACE2(("leave dropbear_chachapoly_crypt"))
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return CRYPT_OK;
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}
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static int dropbear_chachapoly_getlength(unsigned int seq,
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const unsigned char *in, unsigned int *outlen,
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unsigned long len, dropbear_chachapoly_state *state) {
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unsigned char seqbuf[8], buf[4];
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int err;
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TRACE2(("enter dropbear_chachapoly_getlength"))
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if (len < sizeof(buf)) {
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return CRYPT_ERROR;
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}
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STORE64H((uint64_t)seq, seqbuf);
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chacha_ivctr64(&state->header, seqbuf, sizeof(seqbuf), 0);
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if ((err = chacha_crypt(&state->header, in, sizeof(buf), buf)) != CRYPT_OK) {
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return err;
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}
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LOAD32H(*outlen, buf);
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TRACE2(("leave dropbear_chachapoly_getlength"))
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return CRYPT_OK;
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}
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const struct dropbear_cipher_mode dropbear_mode_chachapoly =
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{(void *)dropbear_chachapoly_start, NULL, NULL,
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(void *)dropbear_chachapoly_crypt,
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(void *)dropbear_chachapoly_getlength, &dropbear_chachapoly_mac};
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#endif /* DROPBEAR_CHACHA20POLY1305 */
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@ -0,0 +1,44 @@
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/*
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* Dropbear SSH
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*
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||||
* Copyright (c) 2002,2003 Matt Johnston
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||||
* Copyright (c) 2020 by Vladislav Grishenko
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||||
* All rights reserved.
|
||||
*
|
||||
* Permission is hereby granted, free of charge, to any person obtaining a copy
|
||||
* of this software and associated documentation files (the "Software"), to deal
|
||||
* in the Software without restriction, including without limitation the rights
|
||||
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
||||
* copies of the Software, and to permit persons to whom the Software is
|
||||
* furnished to do so, subject to the following conditions:
|
||||
*
|
||||
* The above copyright notice and this permission notice shall be included in
|
||||
* all copies or substantial portions of the Software.
|
||||
*
|
||||
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
||||
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
||||
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
||||
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
||||
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
||||
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
|
||||
* SOFTWARE. */
|
||||
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||||
#ifndef DROPBEAR_DROPBEAR_CHACHAPOLY_H_
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#define DROPBEAR_DROPBEAR_CHACHAPOLY_H_
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#include "includes.h"
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#include "algo.h"
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||||
#if DROPBEAR_CHACHA20POLY1305
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typedef struct {
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chacha_state chacha;
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chacha_state header;
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||||
} dropbear_chachapoly_state;
|
||||
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||||
extern const struct dropbear_cipher dropbear_chachapoly;
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||||
extern const struct dropbear_cipher_mode dropbear_mode_chachapoly;
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||||
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||||
#endif /* DROPBEAR_CHACHA20POLY1305 */
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||||
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#endif /* DROPBEAR_DROPBEAR_CHACHAPOLY_H_ */
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/*
|
||||
* Dropbear - a SSH2 server
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||||
*
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||||
* Copyright (c) 2002,2003 Matt Johnston
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||||
* All rights reserved.
|
||||
*
|
||||
* Permission is hereby granted, free of charge, to any person obtaining a copy
|
||||
* of this software and associated documentation files (the "Software"), to deal
|
||||
* in the Software without restriction, including without limitation the rights
|
||||
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
||||
* copies of the Software, and to permit persons to whom the Software is
|
||||
* furnished to do so, subject to the following conditions:
|
||||
*
|
||||
* The above copyright notice and this permission notice shall be included in
|
||||
* all copies or substantial portions of the Software.
|
||||
*
|
||||
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
||||
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
||||
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
||||
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
||||
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
||||
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
|
||||
* SOFTWARE. */
|
||||
|
||||
#include "includes.h"
|
||||
#include "dbrandom.h"
|
||||
#include "curve25519.h"
|
||||
|
||||
#if DROPBEAR_CURVE25519 || DROPBEAR_ED25519
|
||||
|
||||
/* Modified TweetNaCl version 20140427, a self-contained public-domain C library.
|
||||
* https://tweetnacl.cr.yp.to/ */
|
||||
|
||||
#define FOR(i,n) for (i = 0;i < n;++i)
|
||||
#define sv static void
|
||||
|
||||
typedef unsigned char u8;
|
||||
typedef unsigned long u32;
|
||||
typedef unsigned long long u64;
|
||||
typedef long long i64;
|
||||
typedef i64 gf[16];
|
||||
|
||||
#if DROPBEAR_CURVE25519
|
||||
static const gf
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||||
_121665 = {0xDB41,1};
|
||||
#endif /* DROPBEAR_CURVE25519 */
|
||||
#if DROPBEAR_ED25519
|
||||
static const gf
|
||||
gf0,
|
||||
gf1 = {1},
|
||||
D2 = {0xf159, 0x26b2, 0x9b94, 0xebd6, 0xb156, 0x8283, 0x149a, 0x00e0, 0xd130, 0xeef3, 0x80f2, 0x198e, 0xfce7, 0x56df, 0xd9dc, 0x2406},
|
||||
X = {0xd51a, 0x8f25, 0x2d60, 0xc956, 0xa7b2, 0x9525, 0xc760, 0x692c, 0xdc5c, 0xfdd6, 0xe231, 0xc0a4, 0x53fe, 0xcd6e, 0x36d3, 0x2169},
|
||||
Y = {0x6658, 0x6666, 0x6666, 0x6666, 0x6666, 0x6666, 0x6666, 0x6666, 0x6666, 0x6666, 0x6666, 0x6666, 0x6666, 0x6666, 0x6666, 0x6666};
|
||||
#if DROPBEAR_SIGNKEY_VERIFY
|
||||
static const gf
|
||||
D = {0x78a3, 0x1359, 0x4dca, 0x75eb, 0xd8ab, 0x4141, 0x0a4d, 0x0070, 0xe898, 0x7779, 0x4079, 0x8cc7, 0xfe73, 0x2b6f, 0x6cee, 0x5203},
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||||
I = {0xa0b0, 0x4a0e, 0x1b27, 0xc4ee, 0xe478, 0xad2f, 0x1806, 0x2f43, 0xd7a7, 0x3dfb, 0x0099, 0x2b4d, 0xdf0b, 0x4fc1, 0x2480, 0x2b83};
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||||
#endif /* DROPBEAR_SIGNKEY_VERIFY */
|
||||
#endif /* DROPBEAR_ED25519 */
|
||||
|
||||
#if DROPBEAR_ED25519
|
||||
#if DROPBEAR_SIGNKEY_VERIFY
|
||||
static int vn(const u8 *x,const u8 *y,u32 n)
|
||||
{
|
||||
u32 i,d = 0;
|
||||
FOR(i,n) d |= x[i]^y[i];
|
||||
return (1 & ((d - 1) >> 8)) - 1;
|
||||
}
|
||||
|
||||
static int crypto_verify_32(const u8 *x,const u8 *y)
|
||||
{
|
||||
return vn(x,y,32);
|
||||
}
|
||||
#endif /* DROPBEAR_SIGNKEY_VERIFY */
|
||||
|
||||
sv set25519(gf r, const gf a)
|
||||
{
|
||||
int i;
|
||||
FOR(i,16) r[i]=a[i];
|
||||
}
|
||||
#endif /* DROPBEAR_ED25519 */
|
||||
|
||||
sv car25519(gf o)
|
||||
{
|
||||
int i;
|
||||
i64 c;
|
||||
FOR(i,16) {
|
||||
o[i]+=(1LL<<16);
|
||||
c=o[i]>>16;
|
||||
o[(i+1)*(i<15)]+=c-1+37*(c-1)*(i==15);
|
||||
o[i]-=c<<16;
|
||||
}
|
||||
}
|
||||
|
||||
sv sel25519(gf p,gf q,int b)
|
||||
{
|
||||
i64 t,i,c=~(b-1);
|
||||
FOR(i,16) {
|
||||
t= c&(p[i]^q[i]);
|
||||
p[i]^=t;
|
||||
q[i]^=t;
|
||||
}
|
||||
}
|
||||
|
||||
sv pack25519(u8 *o,const gf n)
|
||||
{
|
||||
int i,j,b;
|
||||
gf m,t;
|
||||
FOR(i,16) t[i]=n[i];
|
||||
car25519(t);
|
||||
car25519(t);
|
||||
car25519(t);
|
||||
FOR(j,2) {
|
||||
m[0]=t[0]-0xffed;
|
||||
for(i=1;i<15;i++) {
|
||||
m[i]=t[i]-0xffff-((m[i-1]>>16)&1);
|
||||
m[i-1]&=0xffff;
|
||||
}
|
||||
m[15]=t[15]-0x7fff-((m[14]>>16)&1);
|
||||
b=(m[15]>>16)&1;
|
||||
m[14]&=0xffff;
|
||||
sel25519(t,m,1-b);
|
||||
}
|
||||
FOR(i,16) {
|
||||
o[2*i]=t[i]&0xff;
|
||||
o[2*i+1]=t[i]>>8;
|
||||
}
|
||||
}
|
||||
|
||||
#if DROPBEAR_ED25519
|
||||
#if DROPBEAR_SIGNKEY_VERIFY
|
||||
static int neq25519(const gf a, const gf b)
|
||||
{
|
||||
u8 c[32],d[32];
|
||||
pack25519(c,a);
|
||||
pack25519(d,b);
|
||||
return crypto_verify_32(c,d);
|
||||
}
|
||||
#endif /* DROPBEAR_SIGNKEY_VERIFY */
|
||||
|
||||
static u8 par25519(const gf a)
|
||||
{
|
||||
u8 d[32];
|
||||
pack25519(d,a);
|
||||
return d[0]&1;
|
||||
}
|
||||
#endif /* DROPBEAR_ED25519 */
|
||||
|
||||
sv unpack25519(gf o, const u8 *n)
|
||||
{
|
||||
int i;
|
||||
FOR(i,16) o[i]=n[2*i]+((i64)n[2*i+1]<<8);
|
||||
o[15]&=0x7fff;
|
||||
}
|
||||
|
||||
sv A(gf o,const gf a,const gf b)
|
||||
{
|
||||
int i;
|
||||
FOR(i,16) o[i]=a[i]+b[i];
|
||||
}
|
||||
|
||||
sv Z(gf o,const gf a,const gf b)
|
||||
{
|
||||
int i;
|
||||
FOR(i,16) o[i]=a[i]-b[i];
|
||||
}
|
||||
|
||||
sv M(gf o,const gf a,const gf b)
|
||||
{
|
||||
i64 i,j,t[31];
|
||||
FOR(i,31) t[i]=0;
|
||||
FOR(i,16) FOR(j,16) t[i+j]+=a[i]*b[j];
|
||||
FOR(i,15) t[i]+=38*t[i+16];
|
||||
FOR(i,16) o[i]=t[i];
|
||||
car25519(o);
|
||||
car25519(o);
|
||||
}
|
||||
|
||||
sv S(gf o,const gf a)
|
||||
{
|
||||
M(o,a,a);
|
||||
}
|
||||
|
||||
sv inv25519(gf o,const gf i)
|
||||
{
|
||||
gf c;
|
||||
int a;
|
||||
FOR(a,16) c[a]=i[a];
|
||||
for(a=253;a>=0;a--) {
|
||||
S(c,c);
|
||||
if(a!=2&&a!=4) M(c,c,i);
|
||||
}
|
||||
FOR(a,16) o[a]=c[a];
|
||||
}
|
||||
|
||||
#if DROPBEAR_ED25519 && DROPBEAR_SIGNKEY_VERIFY
|
||||
sv pow2523(gf o,const gf i)
|
||||
{
|
||||
gf c;
|
||||
int a;
|
||||
FOR(a,16) c[a]=i[a];
|
||||
for(a=250;a>=0;a--) {
|
||||
S(c,c);
|
||||
if(a!=1) M(c,c,i);
|
||||
}
|
||||
FOR(a,16) o[a]=c[a];
|
||||
}
|
||||
#endif /* DROPBEAR_ED25519 && DROPBEAR_SIGNKEY_VERIFY */
|
||||
|
||||
#if DROPBEAR_CURVE25519
|
||||
void dropbear_curve25519_scalarmult(u8 *q,const u8 *n,const u8 *p)
|
||||
{
|
||||
u8 z[32];
|
||||
i64 x[80],r,i;
|
||||
gf a,b,c,d,e,f;
|
||||
FOR(i,31) z[i]=n[i];
|
||||
z[31]=(n[31]&127)|64;
|
||||
z[0]&=248;
|
||||
unpack25519(x,p);
|
||||
FOR(i,16) {
|
||||
b[i]=x[i];
|
||||
d[i]=a[i]=c[i]=0;
|
||||
}
|
||||
a[0]=d[0]=1;
|
||||
for(i=254;i>=0;--i) {
|
||||
r=(z[i>>3]>>(i&7))&1;
|
||||
sel25519(a,b,r);
|
||||
sel25519(c,d,r);
|
||||
A(e,a,c);
|
||||
Z(a,a,c);
|
||||
A(c,b,d);
|
||||
Z(b,b,d);
|
||||
S(d,e);
|
||||
S(f,a);
|
||||
M(a,c,a);
|
||||
M(c,b,e);
|
||||
A(e,a,c);
|
||||
Z(a,a,c);
|
||||
S(b,a);
|
||||
Z(c,d,f);
|
||||
M(a,c,_121665);
|
||||
A(a,a,d);
|
||||
M(c,c,a);
|
||||
M(a,d,f);
|
||||
M(d,b,x);
|
||||
S(b,e);
|
||||
sel25519(a,b,r);
|
||||
sel25519(c,d,r);
|
||||
}
|
||||
FOR(i,16) {
|
||||
x[i+16]=a[i];
|
||||
x[i+32]=c[i];
|
||||
x[i+48]=b[i];
|
||||
x[i+64]=d[i];
|
||||
}
|
||||
inv25519(x+32,x+32);
|
||||
M(x+16,x+16,x+32);
|
||||
pack25519(q,x+16);
|
||||
}
|
||||
#endif /* DROPBEAR_CURVE25519 */
|
||||
|
||||
#if DROPBEAR_ED25519
|
||||
static int crypto_hash(u8 *out,const u8 *m,u64 n)
|
||||
{
|
||||
hash_state hs;
|
||||
|
||||
sha512_init(&hs);
|
||||
sha512_process(&hs, m, n);
|
||||
return sha512_done(&hs, out);
|
||||
}
|
||||
|
||||
sv add(gf p[4],gf q[4])
|
||||
{
|
||||
gf a,b,c,d,t,e,f,g,h;
|
||||
|
||||
Z(a, p[1], p[0]);
|
||||
Z(t, q[1], q[0]);
|
||||
M(a, a, t);
|
||||
A(b, p[0], p[1]);
|
||||
A(t, q[0], q[1]);
|
||||
M(b, b, t);
|
||||
M(c, p[3], q[3]);
|
||||
M(c, c, D2);
|
||||
M(d, p[2], q[2]);
|
||||
A(d, d, d);
|
||||
Z(e, b, a);
|
||||
Z(f, d, c);
|
||||
A(g, d, c);
|
||||
A(h, b, a);
|
||||
|
||||
M(p[0], e, f);
|
||||
M(p[1], h, g);
|
||||
M(p[2], g, f);
|
||||
M(p[3], e, h);
|
||||
}
|
||||
|
||||
sv cswap(gf p[4],gf q[4],u8 b)
|
||||
{
|
||||
int i;
|
||||
FOR(i,4)
|
||||
sel25519(p[i],q[i],b);
|
||||
}
|
||||
|
||||
sv pack(u8 *r,gf p[4])
|
||||
{
|
||||
gf tx, ty, zi;
|
||||
inv25519(zi, p[2]);
|
||||
M(tx, p[0], zi);
|
||||
M(ty, p[1], zi);
|
||||
pack25519(r, ty);
|
||||
r[31] ^= par25519(tx) << 7;
|
||||
}
|
||||
|
||||
sv scalarmult(gf p[4],gf q[4],const u8 *s)
|
||||
{
|
||||
int i;
|
||||
set25519(p[0],gf0);
|
||||
set25519(p[1],gf1);
|
||||
set25519(p[2],gf1);
|
||||
set25519(p[3],gf0);
|
||||
for (i = 255;i >= 0;--i) {
|
||||
u8 b = (s[i/8]>>(i&7))&1;
|
||||
cswap(p,q,b);
|
||||
add(q,p);
|
||||
add(p,p);
|
||||
cswap(p,q,b);
|
||||
}
|
||||
}
|
||||
|
||||
sv scalarbase(gf p[4],const u8 *s)
|
||||
{
|
||||
gf q[4];
|
||||
set25519(q[0],X);
|
||||
set25519(q[1],Y);
|
||||
set25519(q[2],gf1);
|
||||
M(q[3],X,Y);
|
||||
scalarmult(p,q,s);
|
||||
}
|
||||
|
||||
void dropbear_ed25519_make_key(u8 *pk,u8 *sk)
|
||||
{
|
||||
u8 d[64];
|
||||
gf p[4];
|
||||
|
||||
genrandom(sk, 32);
|
||||
|
||||
crypto_hash(d, sk, 32);
|
||||
d[0] &= 248;
|
||||
d[31] &= 127;
|
||||
d[31] |= 64;
|
||||
|
||||
scalarbase(p,d);
|
||||
pack(pk,p);
|
||||
}
|
||||
|
||||
static const u64 L[32] = {0xed, 0xd3, 0xf5, 0x5c, 0x1a, 0x63, 0x12, 0x58, 0xd6, 0x9c, 0xf7, 0xa2, 0xde, 0xf9, 0xde, 0x14, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0x10};
|
||||
|
||||
sv modL(u8 *r,i64 x[64])
|
||||
{
|
||||
i64 carry,i,j;
|
||||
for (i = 63;i >= 32;--i) {
|
||||
carry = 0;
|
||||
for (j = i - 32;j < i - 12;++j) {
|
||||
x[j] += carry - 16 * x[i] * L[j - (i - 32)];
|
||||
carry = (x[j] + 128) >> 8;
|
||||
x[j] -= carry << 8;
|
||||
}
|
||||
x[j] += carry;
|
||||
x[i] = 0;
|
||||
}
|
||||
carry = 0;
|
||||
FOR(j,32) {
|
||||
x[j] += carry - (x[31] >> 4) * L[j];
|
||||
carry = x[j] >> 8;
|
||||
x[j] &= 255;
|
||||
}
|
||||
FOR(j,32) x[j] -= carry * L[j];
|
||||
FOR(i,32) {
|
||||
x[i+1] += x[i] >> 8;
|
||||
r[i] = x[i] & 255;
|
||||
}
|
||||
}
|
||||
|
||||
sv reduce(u8 *r)
|
||||
{
|
||||
i64 x[64],i;
|
||||
FOR(i,64) x[i] = (u64) r[i];
|
||||
FOR(i,64) r[i] = 0;
|
||||
modL(r,x);
|
||||
}
|
||||
|
||||
void dropbear_ed25519_sign(const u8 *m,u32 mlen,u8 *s,u32 *slen,const u8 *sk, const u8 *pk)
|
||||
{
|
||||
hash_state hs;
|
||||
u8 d[64],h[64],r[64];
|
||||
i64 x[64];
|
||||
gf p[4];
|
||||
u32 i,j;
|
||||
|
||||
crypto_hash(d, sk, 32);
|
||||
d[0] &= 248;
|
||||
d[31] &= 127;
|
||||
d[31] |= 64;
|
||||
|
||||
*slen = 64;
|
||||
|
||||
sha512_init(&hs);
|
||||
sha512_process(&hs,d + 32,32);
|
||||
sha512_process(&hs,m,mlen);
|
||||
sha512_done(&hs,r);
|
||||
reduce(r);
|
||||
scalarbase(p,r);
|
||||
pack(s,p);
|
||||
|
||||
sha512_init(&hs);
|
||||
sha512_process(&hs,s,32);
|
||||
sha512_process(&hs,pk,32);
|
||||
sha512_process(&hs,m,mlen);
|
||||
sha512_done(&hs,h);
|
||||
reduce(h);
|
||||
|
||||
FOR(i,64) x[i] = 0;
|
||||
FOR(i,32) x[i] = (u64) r[i];
|
||||
FOR(i,32) FOR(j,32) x[i+j] += h[i] * (u64) d[j];
|
||||
modL(s + 32,x);
|
||||
}
|
||||
|
||||
#if DROPBEAR_SIGNKEY_VERIFY
|
||||
static int unpackneg(gf r[4],const u8 p[32])
|
||||
{
|
||||
gf t, chk, num, den, den2, den4, den6;
|
||||
set25519(r[2],gf1);
|
||||
unpack25519(r[1],p);
|
||||
S(num,r[1]);
|
||||
M(den,num,D);
|
||||
Z(num,num,r[2]);
|
||||
A(den,r[2],den);
|
||||
|
||||
S(den2,den);
|
||||
S(den4,den2);
|
||||
M(den6,den4,den2);
|
||||
M(t,den6,num);
|
||||
M(t,t,den);
|
||||
|
||||
pow2523(t,t);
|
||||
M(t,t,num);
|
||||
M(t,t,den);
|
||||
M(t,t,den);
|
||||
M(r[0],t,den);
|
||||
|
||||
S(chk,r[0]);
|
||||
M(chk,chk,den);
|
||||
if (neq25519(chk, num)) M(r[0],r[0],I);
|
||||
|
||||
S(chk,r[0]);
|
||||
M(chk,chk,den);
|
||||
if (neq25519(chk, num)) return -1;
|
||||
|
||||
if (par25519(r[0]) == (p[31]>>7)) Z(r[0],gf0,r[0]);
|
||||
|
||||
M(r[3],r[0],r[1]);
|
||||
return 0;
|
||||
}
|
||||
|
||||
int dropbear_ed25519_verify(const u8 *m,u32 mlen,const u8 *s,u32 slen,const u8 *pk)
|
||||
{
|
||||
hash_state hs;
|
||||
u8 t[32],h[64];
|
||||
gf p[4],q[4];
|
||||
|
||||
if (slen < 64) return -1;
|
||||
|
||||
if (unpackneg(q,pk)) return -1;
|
||||
|
||||
sha512_init(&hs);
|
||||
sha512_process(&hs,s,32);
|
||||
sha512_process(&hs,pk,32);
|
||||
sha512_process(&hs,m,mlen);
|
||||
sha512_done(&hs,h);
|
||||
|
||||
reduce(h);
|
||||
scalarmult(p,q,h);
|
||||
|
||||
scalarbase(q,s + 32);
|
||||
add(p,q);
|
||||
pack(t,p);
|
||||
|
||||
if (crypto_verify_32(s, t))
|
||||
return -1;
|
||||
|
||||
return 0;
|
||||
}
|
||||
#endif /* DROPBEAR_SIGNKEY_VERIFY */
|
||||
|
||||
#endif /* DROPBEAR_ED25519 */
|
||||
|
||||
#endif /* DROPBEAR_CURVE25519 || DROPBEAR_ED25519 */
|
@ -0,0 +1,37 @@
|
||||
/*
|
||||
* Dropbear - a SSH2 server
|
||||
*
|
||||
* Copyright (c) 2002,2003 Matt Johnston
|
||||
* All rights reserved.
|
||||
*
|
||||
* Permission is hereby granted, free of charge, to any person obtaining a copy
|
||||
* of this software and associated documentation files (the "Software"), to deal
|
||||
* in the Software without restriction, including without limitation the rights
|
||||
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
||||
* copies of the Software, and to permit persons to whom the Software is
|
||||
* furnished to do so, subject to the following conditions:
|
||||
*
|
||||
* The above copyright notice and this permission notice shall be included in
|
||||
* all copies or substantial portions of the Software.
|
||||
*
|
||||
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
||||
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
||||
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
||||
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
||||
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
||||
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
|
||||
* SOFTWARE. */
|
||||
|
||||
#ifndef DROPBEAR_CURVE25519_H
|
||||
#define DROPBEAR_CURVE25519_H
|
||||
|
||||
void dropbear_curve25519_scalarmult(unsigned char *q, const unsigned char *n, const unsigned char *p);
|
||||
void dropbear_ed25519_make_key(unsigned char *pk, unsigned char *sk);
|
||||
void dropbear_ed25519_sign(const unsigned char *m, unsigned long mlen,
|
||||
unsigned char *s, unsigned long *slen,
|
||||
const unsigned char *sk, const unsigned char *pk);
|
||||
int dropbear_ed25519_verify(const unsigned char *m, unsigned long mlen,
|
||||
const unsigned char *s, unsigned long slen,
|
||||
const unsigned char *pk);
|
||||
|
||||
#endif /* DROPBEAR_CURVE25519_H */
|
@ -0,0 +1,8 @@
|
||||
#!/bin/sh
|
||||
|
||||
EXITCODE=0
|
||||
|
||||
# #ifdef instead of #if
|
||||
grep '#ifdef DROPBEAR' -I *.c *.h && EXITCODE=1
|
||||
|
||||
exit $EXITCODE
|
@ -0,0 +1,182 @@
|
||||
/*
|
||||
* Dropbear - a SSH2 server
|
||||
*
|
||||
* Copyright (c) 2002,2003 Matt Johnston
|
||||
* All rights reserved.
|
||||
*
|
||||
* Permission is hereby granted, free of charge, to any person obtaining a copy
|
||||
* of this software and associated documentation files (the "Software"), to deal
|
||||
* in the Software without restriction, including without limitation the rights
|
||||
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
||||
* copies of the Software, and to permit persons to whom the Software is
|
||||
* furnished to do so, subject to the following conditions:
|
||||
*
|
||||
* The above copyright notice and this permission notice shall be included in
|
||||
* all copies or substantial portions of the Software.
|
||||
*
|
||||
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
||||
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
||||
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
||||
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
||||
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
||||
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
|
||||
* SOFTWARE. */
|
||||
|
||||
/* Perform Ed25519 operations on data, including reading keys, signing and
|
||||
* verification. */
|
||||
|
||||
#include "includes.h"
|
||||
#include "dbutil.h"
|
||||
#include "buffer.h"
|
||||
#include "ssh.h"
|
||||
#include "curve25519.h"
|
||||
#include "ed25519.h"
|
||||
|
||||
#if DROPBEAR_ED25519
|
||||
|
||||
/* Load a public ed25519 key from a buffer, initialising the values.
|
||||
* The key will have the same format as buf_put_ed25519_key.
|
||||
* These should be freed with ed25519_key_free.
|
||||
* Returns DROPBEAR_SUCCESS or DROPBEAR_FAILURE */
|
||||
int buf_get_ed25519_pub_key(buffer *buf, dropbear_ed25519_key *key) {
|
||||
|
||||
unsigned int len;
|
||||
|
||||
TRACE(("enter buf_get_ed25519_pub_key"))
|
||||
dropbear_assert(key != NULL);
|
||||
|
||||
buf_incrpos(buf, 4+SSH_SIGNKEY_ED25519_LEN); /* int + "ssh-ed25519" */
|
||||
|
||||
len = buf_getint(buf);
|
||||
if (len != CURVE25519_LEN || buf->len - buf->pos < len) {
|
||||
TRACE(("leave buf_get_ed25519_pub_key: failure"))
|
||||
return DROPBEAR_FAILURE;
|
||||
}
|
||||
|
||||
m_burn(key->priv, CURVE25519_LEN);
|
||||
memcpy(key->pub, buf_getptr(buf, CURVE25519_LEN), CURVE25519_LEN);
|
||||
buf_incrpos(buf, CURVE25519_LEN);
|
||||
|
||||
TRACE(("leave buf_get_ed25519_pub_key: success"))
|
||||
return DROPBEAR_SUCCESS;
|
||||
}
|
||||
|
||||
/* Same as buf_get_ed25519_pub_key, but reads private key at the end.
|
||||
* Loads a public and private ed25519 key from a buffer
|
||||
* Returns DROPBEAR_SUCCESS or DROPBEAR_FAILURE */
|
||||
int buf_get_ed25519_priv_key(buffer *buf, dropbear_ed25519_key *key) {
|
||||
|
||||
unsigned int len;
|
||||
|
||||
TRACE(("enter buf_get_ed25519_priv_key"))
|
||||
dropbear_assert(key != NULL);
|
||||
|
||||
buf_incrpos(buf, 4+SSH_SIGNKEY_ED25519_LEN); /* int + "ssh-ed25519" */
|
||||
|
||||
len = buf_getint(buf);
|
||||
if (len != CURVE25519_LEN*2 || buf->len - buf->pos < len) {
|
||||
TRACE(("leave buf_get_ed25519_priv_key: failure"))
|
||||
return DROPBEAR_FAILURE;
|
||||
}
|
||||
|
||||
memcpy(key->priv, buf_getptr(buf, CURVE25519_LEN), CURVE25519_LEN);
|
||||
buf_incrpos(buf, CURVE25519_LEN);
|
||||
memcpy(key->pub, buf_getptr(buf, CURVE25519_LEN), CURVE25519_LEN);
|
||||
buf_incrpos(buf, CURVE25519_LEN);
|
||||
|
||||
TRACE(("leave buf_get_ed25519_priv_key: success"))
|
||||
return DROPBEAR_SUCCESS;
|
||||
}
|
||||
|
||||
/* Clear and free the memory used by a public or private key */
|
||||
void ed25519_key_free(dropbear_ed25519_key *key) {
|
||||
|
||||
TRACE2(("enter ed25519_key_free"))
|
||||
|
||||
if (key == NULL) {
|
||||
TRACE2(("leave ed25519_key_free: key == NULL"))
|
||||
return;
|
||||
}
|
||||
m_burn(key->priv, CURVE25519_LEN);
|
||||
m_free(key);
|
||||
|
||||
TRACE2(("leave ed25519_key_free"))
|
||||
}
|
||||
|
||||
/* Put the public ed25519 key into the buffer in the required format */
|
||||
void buf_put_ed25519_pub_key(buffer *buf, const dropbear_ed25519_key *key) {
|
||||
|
||||
TRACE(("enter buf_put_ed25519_pub_key"))
|
||||
dropbear_assert(key != NULL);
|
||||
|
||||
buf_putstring(buf, SSH_SIGNKEY_ED25519, SSH_SIGNKEY_ED25519_LEN);
|
||||
buf_putstring(buf, key->pub, CURVE25519_LEN);
|
||||
|
||||
TRACE(("leave buf_put_ed25519_pub_key"))
|
||||
}
|
||||
|
||||
/* Put the public and private ed25519 key into the buffer in the required format */
|
||||
void buf_put_ed25519_priv_key(buffer *buf, const dropbear_ed25519_key *key) {
|
||||
|
||||
TRACE(("enter buf_put_ed25519_priv_key"))
|
||||
dropbear_assert(key != NULL);
|
||||
|
||||
buf_putstring(buf, SSH_SIGNKEY_ED25519, SSH_SIGNKEY_ED25519_LEN);
|
||||
buf_putint(buf, CURVE25519_LEN*2);
|
||||
buf_putbytes(buf, key->priv, CURVE25519_LEN);
|
||||
buf_putbytes(buf, key->pub, CURVE25519_LEN);
|
||||
|
||||
TRACE(("leave buf_put_ed25519_priv_key"))
|
||||
}
|
||||
|
||||
/* Sign the data presented with key, writing the signature contents
|
||||
* to the buffer */
|
||||
void buf_put_ed25519_sign(buffer* buf, const dropbear_ed25519_key *key, const buffer *data_buf) {
|
||||
|
||||
unsigned char s[64];
|
||||
unsigned long slen = sizeof(s);
|
||||
|
||||
TRACE(("enter buf_put_ed25519_sign"))
|
||||
dropbear_assert(key != NULL);
|
||||
|
||||
dropbear_ed25519_sign(data_buf->data, data_buf->len, s, &slen, key->priv, key->pub);
|
||||
buf_putstring(buf, SSH_SIGNKEY_ED25519, SSH_SIGNKEY_ED25519_LEN);
|
||||
buf_putstring(buf, s, slen);
|
||||
|
||||
TRACE(("leave buf_put_ed25519_sign"))
|
||||
}
|
||||
|
||||
#if DROPBEAR_SIGNKEY_VERIFY
|
||||
/* Verify a signature in buf, made on data by the key given.
|
||||
* Returns DROPBEAR_SUCCESS or DROPBEAR_FAILURE */
|
||||
int buf_ed25519_verify(buffer *buf, const dropbear_ed25519_key *key, const buffer *data_buf) {
|
||||
|
||||
int ret = DROPBEAR_FAILURE;
|
||||
unsigned char *s;
|
||||
unsigned long slen;
|
||||
|
||||
TRACE(("enter buf_ed25519_verify"))
|
||||
dropbear_assert(key != NULL);
|
||||
|
||||
slen = buf_getint(buf);
|
||||
if (slen != 64 || buf->len - buf->pos < slen) {
|
||||
TRACE(("leave buf_ed25519_verify: bad size"))
|
||||
goto out;
|
||||
}
|
||||
s = buf_getptr(buf, slen);
|
||||
|
||||
if (dropbear_ed25519_verify(data_buf->data, data_buf->len,
|
||||
s, slen, key->pub) == 0) {
|
||||
/* signature is valid */
|
||||
TRACE(("leave buf_ed25519_verify: success!"))
|
||||
ret = DROPBEAR_SUCCESS;
|
||||
}
|
||||
|
||||
out:
|
||||
TRACE(("leave buf_ed25519_verify: ret %d", ret))
|
||||
return ret;
|
||||
}
|
||||
|
||||
#endif /* DROPBEAR_SIGNKEY_VERIFY */
|
||||
|
||||
#endif /* DROPBEAR_ED25519 */
|
@ -0,0 +1,54 @@
|
||||
/*
|
||||
* Dropbear - a SSH2 server
|
||||
*
|
||||
* Copyright (c) 2002,2003 Matt Johnston
|
||||
* All rights reserved.
|
||||
*
|
||||
* Permission is hereby granted, free of charge, to any person obtaining a copy
|
||||
* of this software and associated documentation files (the "Software"), to deal
|
||||
* in the Software without restriction, including without limitation the rights
|
||||
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
||||
* copies of the Software, and to permit persons to whom the Software is
|
||||
* furnished to do so, subject to the following conditions:
|
||||
*
|
||||
* The above copyright notice and this permission notice shall be included in
|
||||
* all copies or substantial portions of the Software.
|
||||
*
|
||||
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
||||
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
||||
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
||||
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
||||
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
||||
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
|
||||
* SOFTWARE. */
|
||||
|
||||
#ifndef DROPBEAR_ED25519_H_
|
||||
#define DROPBEAR_ED25519_H_
|
||||
|
||||
#include "includes.h"
|
||||
#include "buffer.h"
|
||||
|
||||
#if DROPBEAR_ED25519
|
||||
|
||||
#define CURVE25519_LEN 32
|
||||
|
||||
typedef struct dropbear_ED25519_Key {
|
||||
|
||||
unsigned char priv[CURVE25519_LEN];
|
||||
unsigned char pub[CURVE25519_LEN];
|
||||
|
||||
} dropbear_ed25519_key;
|
||||
|
||||
void buf_put_ed25519_sign(buffer* buf, const dropbear_ed25519_key *key, const buffer *data_buf);
|
||||
#if DROPBEAR_SIGNKEY_VERIFY
|
||||
int buf_ed25519_verify(buffer * buf, const dropbear_ed25519_key *key, const buffer *data_buf);
|
||||
#endif
|
||||
int buf_get_ed25519_pub_key(buffer* buf, dropbear_ed25519_key *key);
|
||||
int buf_get_ed25519_priv_key(buffer* buf, dropbear_ed25519_key *key);
|
||||
void buf_put_ed25519_pub_key(buffer* buf, const dropbear_ed25519_key *key);
|
||||
void buf_put_ed25519_priv_key(buffer* buf, const dropbear_ed25519_key *key);
|
||||
void ed25519_key_free(dropbear_ed25519_key *key);
|
||||
|
||||
#endif /* DROPBEAR_ED25519 */
|
||||
|
||||
#endif /* DROPBEAR_ED25519_H_ */
|
@ -0,0 +1,120 @@
|
||||
/*
|
||||
* Dropbear SSH
|
||||
*
|
||||
* Copyright (c) 2002,2003 Matt Johnston
|
||||
* Copyright (c) 2020 by Vladislav Grishenko
|
||||
* All rights reserved.
|
||||
*
|
||||
* Permission is hereby granted, free of charge, to any person obtaining a copy
|
||||
* of this software and associated documentation files (the "Software"), to deal
|
||||
* in the Software without restriction, including without limitation the rights
|
||||
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
||||
* copies of the Software, and to permit persons to whom the Software is
|
||||
* furnished to do so, subject to the following conditions:
|
||||
*
|
||||
* The above copyright notice and this permission notice shall be included in
|
||||
* all copies or substantial portions of the Software.
|
||||
*
|
||||
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
||||
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
||||
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
||||
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
||||
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
||||
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
|
||||
* SOFTWARE. */
|
||||
|
||||
#include "includes.h"
|
||||
#include "algo.h"
|
||||
#include "dbutil.h"
|
||||
#include "gcm.h"
|
||||
|
||||
#if DROPBEAR_ENABLE_GCM_MODE
|
||||
|
||||
#define GHASH_LEN 16
|
||||
|
||||
static const struct dropbear_hash dropbear_ghash =
|
||||
{NULL, 0, GHASH_LEN};
|
||||
|
||||
static int dropbear_gcm_start(int cipher, const unsigned char *IV,
|
||||
const unsigned char *key, int keylen,
|
||||
int UNUSED(num_rounds), dropbear_gcm_state *state) {
|
||||
int err;
|
||||
|
||||
TRACE2(("enter dropbear_gcm_start"))
|
||||
|
||||
if ((err = gcm_init(&state->gcm, cipher, key, keylen)) != CRYPT_OK) {
|
||||
return err;
|
||||
}
|
||||
memcpy(state->iv, IV, GCM_NONCE_LEN);
|
||||
|
||||
TRACE2(("leave dropbear_gcm_start"))
|
||||
return CRYPT_OK;
|
||||
}
|
||||
|
||||
static int dropbear_gcm_crypt(unsigned int UNUSED(seq),
|
||||
const unsigned char *in, unsigned char *out,
|
||||
unsigned long len, unsigned long taglen,
|
||||
dropbear_gcm_state *state, int direction) {
|
||||
unsigned char *iv, tag[GHASH_LEN];
|
||||
int i, err;
|
||||
|
||||
TRACE2(("enter dropbear_gcm_crypt"))
|
||||
|
||||
if (len < 4 || taglen != GHASH_LEN) {
|
||||
return CRYPT_ERROR;
|
||||
}
|
||||
|
||||
gcm_reset(&state->gcm);
|
||||
|
||||
if ((err = gcm_add_iv(&state->gcm,
|
||||
state->iv, GCM_NONCE_LEN)) != CRYPT_OK) {
|
||||
return err;
|
||||
}
|
||||
|
||||
if ((err = gcm_add_aad(&state->gcm, in, 4)) != CRYPT_OK) {
|
||||
return err;
|
||||
}
|
||||
|
||||
if ((err = gcm_process(&state->gcm, (unsigned char *) in + 4,
|
||||
len - 4, out + 4, direction)) != CRYPT_OK) {
|
||||
return err;
|
||||
}
|
||||
|
||||
if (direction == LTC_ENCRYPT) {
|
||||
gcm_done(&state->gcm, out + len, &taglen);
|
||||
} else {
|
||||
gcm_done(&state->gcm, tag, &taglen);
|
||||
if (constant_time_memcmp(in + len, tag, taglen) != 0) {
|
||||
return CRYPT_ERROR;
|
||||
}
|
||||
}
|
||||
|
||||
/* increment invocation counter */
|
||||
iv = state->iv + GCM_IVFIX_LEN;
|
||||
for (i = GCM_IVCTR_LEN - 1; i >= 0 && ++iv[i] == 0; i--);
|
||||
|
||||
TRACE2(("leave dropbear_gcm_crypt"))
|
||||
return CRYPT_OK;
|
||||
}
|
||||
|
||||
static int dropbear_gcm_getlength(unsigned int UNUSED(seq),
|
||||
const unsigned char *in, unsigned int *outlen,
|
||||
unsigned long len, dropbear_gcm_state* UNUSED(state)) {
|
||||
TRACE2(("enter dropbear_gcm_getlength"))
|
||||
|
||||
if (len < 4) {
|
||||
return CRYPT_ERROR;
|
||||
}
|
||||
|
||||
LOAD32H(*outlen, in);
|
||||
|
||||
TRACE2(("leave dropbear_gcm_getlength"))
|
||||
return CRYPT_OK;
|
||||
}
|
||||
|
||||
const struct dropbear_cipher_mode dropbear_mode_gcm =
|
||||
{(void *)dropbear_gcm_start, NULL, NULL,
|
||||
(void *)dropbear_gcm_crypt,
|
||||
(void *)dropbear_gcm_getlength, &dropbear_ghash};
|
||||
|
||||
#endif /* DROPBEAR_ENABLE_GCM_MODE */
|
@ -0,0 +1,47 @@
|
||||
/*
|
||||
* Dropbear SSH
|
||||
*
|
||||
* Copyright (c) 2002,2003 Matt Johnston
|
||||
* Copyright (c) 2020 by Vladislav Grishenko
|
||||
* All rights reserved.
|
||||
*
|
||||
* Permission is hereby granted, free of charge, to any person obtaining a copy
|
||||
* of this software and associated documentation files (the "Software"), to deal
|
||||
* in the Software without restriction, including without limitation the rights
|
||||
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
||||
* copies of the Software, and to permit persons to whom the Software is
|
||||
* furnished to do so, subject to the following conditions:
|
||||
*
|
||||
* The above copyright notice and this permission notice shall be included in
|
||||
* all copies or substantial portions of the Software.
|
||||
*
|
||||
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
||||
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
||||
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
||||
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
||||
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
||||
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
|
||||
* SOFTWARE. */
|
||||
|
||||
#ifndef DROPBEAR_DROPBEAR_GCM_H_
|
||||
#define DROPBEAR_DROPBEAR_GCM_H_
|
||||
|
||||
#include "includes.h"
|
||||
#include "algo.h"
|
||||
|
||||
#if DROPBEAR_ENABLE_GCM_MODE
|
||||
|
||||
#define GCM_IVFIX_LEN 4
|
||||
#define GCM_IVCTR_LEN 8
|
||||
#define GCM_NONCE_LEN (GCM_IVFIX_LEN + GCM_IVCTR_LEN)
|
||||
|
||||
typedef struct {
|
||||
gcm_state gcm;
|
||||
unsigned char iv[GCM_NONCE_LEN];
|
||||
} dropbear_gcm_state;
|
||||
|
||||
extern const struct dropbear_cipher_mode dropbear_mode_gcm;
|
||||
|
||||
#endif /* DROPBEAR_ENABLE_GCM_MODE */
|
||||
|
||||
#endif /* DROPBEAR_DROPBEAR_GCM_H_ */
|
@ -0,0 +1,47 @@
|
||||
/*
|
||||
* Dropbear - a SSH2 server
|
||||
*
|
||||
* Copyright (c) 2002,2003 Matt Johnston
|
||||
* All rights reserved.
|
||||
*
|
||||
* Permission is hereby granted, free of charge, to any person obtaining a copy
|
||||
* of this software and associated documentation files (the "Software"), to deal
|
||||
* in the Software without restriction, including without limitation the rights
|
||||
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
||||
* copies of the Software, and to permit persons to whom the Software is
|
||||
* furnished to do so, subject to the following conditions:
|
||||
*
|
||||
* The above copyright notice and this permission notice shall be included in
|
||||
* all copies or substantial portions of the Software.
|
||||
*
|
||||
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
||||
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
||||
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
||||
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
||||
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
||||
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
|
||||
* SOFTWARE. */
|
||||
|
||||
#include "includes.h"
|
||||
#include "dbutil.h"
|
||||
#include "dbrandom.h"
|
||||
#include "curve25519.h"
|
||||
#include "gened25519.h"
|
||||
|
||||
#if DROPBEAR_ED25519
|
||||
|
||||
dropbear_ed25519_key * gen_ed25519_priv_key(unsigned int size) {
|
||||
|
||||
dropbear_ed25519_key *key;
|
||||
|
||||
if (size != 256) {
|
||||
dropbear_exit("Ed25519 keys have a fixed size of 256 bits");
|
||||
}
|
||||
|
||||
key = m_malloc(sizeof(*key));
|
||||
dropbear_ed25519_make_key(key->pub, key->priv);
|
||||
|
||||
return key;
|
||||
}
|
||||
|
||||
#endif /* DROPBEAR_ED25519 */
|
@ -0,0 +1,36 @@
|
||||
/*
|
||||
* Dropbear - a SSH2 server
|
||||
*
|
||||
* Copyright (c) 2002,2003 Matt Johnston
|
||||
* All rights reserved.
|
||||
*
|
||||
* Permission is hereby granted, free of charge, to any person obtaining a copy
|
||||
* of this software and associated documentation files (the "Software"), to deal
|
||||
* in the Software without restriction, including without limitation the rights
|
||||
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
||||
* copies of the Software, and to permit persons to whom the Software is
|
||||
* furnished to do so, subject to the following conditions:
|
||||
*
|
||||
* The above copyright notice and this permission notice shall be included in
|
||||
* all copies or substantial portions of the Software.
|
||||
*
|
||||
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
||||
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
||||
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
||||
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
||||
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
||||
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
|
||||
* SOFTWARE. */
|
||||
|
||||
#ifndef DROPBEAR_GENED25519_H_
|
||||
#define DROPBEAR_GENED25519_H_
|
||||
|
||||
#include "ed25519.h"
|
||||
|
||||
#if DROPBEAR_ED25519
|
||||
|
||||
dropbear_ed25519_key * gen_ed25519_priv_key(unsigned int size);
|
||||
|
||||
#endif /* DROPBEAR_ED25519 */
|
||||
|
||||
#endif /* DROPBEAR_GENED25519_H_ */
|
Some files were not shown because too many files have changed in this diff Show More
Loading…
Reference in new issue