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/* Imported from PuTTY 0.74, 0.75, TeraTerm Project */ |
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|
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/* |
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* (C) 2021- TeraTerm Project |
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* All rights reserved. |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions |
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* are met: |
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* |
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* 1. Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* 2. Redistributions in binary form must reproduce the above copyright |
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* notice, this list of conditions and the following disclaimer in the |
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* documentation and/or other materials provided with the distribution. |
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* 3. The name of the author may not be used to endorse or promote products |
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* derived from this software without specific prior written permission. |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS OR |
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
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* IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY DIRECT, INDIRECT, |
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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*/ |
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|
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#include "ttxssh.h" |
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#include "keyfiles-putty.h" |
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|
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// from sshpubk.c (ver 0.75) |
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BOOL str_to_uint32_t(const char *s, uint32_t *out) |
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{ |
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char *endptr; |
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unsigned long converted = strtoul(s, &endptr, 10); |
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if (*s && !*endptr && converted <= ~(uint32_t)0) { |
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*out = converted; |
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return TRUE; |
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} else { |
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return FALSE; |
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} |
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} |
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|
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// from sshpubk.c (ver 0.74) |
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BOOL ppk_read_header(FILE * fp, char *header) |
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{ |
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int len = 39; |
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int c; |
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|
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while (1) { |
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c = fgetc(fp); |
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if (c == '\n' || c == '\r' || c == EOF) |
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return FALSE; |
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if (c == ':') { |
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c = fgetc(fp); |
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if (c != ' ') |
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return FALSE; |
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*header = '\0'; |
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return TRUE; |
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} |
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if (len == 0) |
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return FALSE; |
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*header++ = c; |
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len--; |
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} |
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return FALSE; |
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} |
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|
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// from sshpubk.c (ver 0.74) |
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char *ppk_read_body(FILE * fp) |
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{ |
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buffer_t *buf = buffer_init(); |
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|
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while (1) { |
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int c = fgetc(fp); |
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if (c == '\r' || c == '\n' || c == EOF) { |
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if (c != EOF) { |
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c = fgetc(fp); |
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if (c != '\r' && c != '\n') |
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ungetc(c, fp); |
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} |
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return buffer_ptr(buf); |
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} |
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buffer_put_char(buf, c); |
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} |
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} |
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|
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// from sshpubk.c (ver 0.74), and modified |
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// - use buffer_t insted of strbuf |
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// - use OpenSSL function |
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BOOL ppk_read_blob(FILE* fp, int nlines, buffer_t *blob) |
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{ |
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BIO *bmem, *b64, *chain; |
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int i, len; |
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char line[200], buf[100]; |
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|
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b64 = BIO_new(BIO_f_base64()); |
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bmem = BIO_new(BIO_s_mem()); |
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for (i=0; i<nlines && fgets(line, sizeof(line), fp)!=NULL; i++) { |
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BIO_write(bmem, line, strlen(line)); |
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} |
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BIO_flush(bmem); |
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chain = BIO_push(b64, bmem); |
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BIO_set_mem_eof_return(chain, 0); |
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while ((len = BIO_read(chain, buf, sizeof(buf))) > 0) { |
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buffer_append(blob, buf, len); |
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} |
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BIO_free_all(chain); |
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|
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return TRUE; |
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} |
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|
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// from sshsha.c (ver 0.70), and modifled |
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// - use OpenSSL function |
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void hmac_sha1_simple(unsigned char *key, int keylen, void *data, int datalen, |
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unsigned char *output) |
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{ |
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EVP_MD_CTX *ctx[2] = {0, 0}; |
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unsigned char intermediate[20]; |
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unsigned char foo[64]; |
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const EVP_MD *md = EVP_sha1(); |
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int i; |
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unsigned int len; |
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|
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ctx[0] = EVP_MD_CTX_new(); |
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if (ctx[0] == NULL) { |
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return; |
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} |
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ctx[1] = EVP_MD_CTX_new(); |
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if (ctx[1] == NULL) { |
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EVP_MD_CTX_free(ctx[0]); |
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return; |
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} |
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|
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memset(foo, 0x36, sizeof(foo)); |
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for (i = 0; i < keylen && i < sizeof(foo); i++) { |
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foo[i] ^= key[i]; |
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} |
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EVP_DigestInit(ctx[0], md); |
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EVP_DigestUpdate(ctx[0], foo, sizeof(foo)); |
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|
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memset(foo, 0x5C, sizeof(foo)); |
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for (i = 0; i < keylen && i < sizeof(foo); i++) { |
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foo[i] ^= key[i]; |
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} |
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EVP_DigestInit(ctx[1], md); |
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EVP_DigestUpdate(ctx[1], foo, sizeof(foo)); |
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|
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memset(foo, 0, sizeof(foo)); |
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|
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EVP_DigestUpdate(ctx[0], data, datalen); |
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EVP_DigestFinal(ctx[0], intermediate, &len); |
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|
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EVP_DigestUpdate(ctx[1], intermediate, sizeof(intermediate)); |
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EVP_DigestFinal(ctx[1], output, &len); |
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|
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EVP_MD_CTX_free(ctx[0]); |
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EVP_MD_CTX_free(ctx[1]); |
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} |
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|
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void hmac_sha256_simple(unsigned char *key, int keylen, void *data, int datalen, |
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unsigned char *output) |
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{ |
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EVP_MD_CTX *ctx[2] = {0, 0}; |
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unsigned char intermediate[32]; |
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unsigned char foo[64]; |
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const EVP_MD *md = EVP_sha256(); |
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int i; |
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unsigned int len; |
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|
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ctx[0] = EVP_MD_CTX_new(); |
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if (ctx[0] == NULL) { |
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return; |
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} |
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ctx[1] = EVP_MD_CTX_new(); |
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if (ctx[1] == NULL) { |
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EVP_MD_CTX_free(ctx[0]); |
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return; |
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} |
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|
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memset(foo, 0x36, sizeof(foo)); |
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for (i = 0; i < keylen && i < sizeof(foo); i++) { |
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foo[i] ^= key[i]; |
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} |
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EVP_DigestInit(ctx[0], md); |
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EVP_DigestUpdate(ctx[0], foo, sizeof(foo)); |
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|
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memset(foo, 0x5C, sizeof(foo)); |
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for (i = 0; i < keylen && i < sizeof(foo); i++) { |
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foo[i] ^= key[i]; |
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} |
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EVP_DigestInit(ctx[1], md); |
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EVP_DigestUpdate(ctx[1], foo, sizeof(foo)); |
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|
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memset(foo, 0, sizeof(foo)); |
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|
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EVP_DigestUpdate(ctx[0], data, datalen); |
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EVP_DigestFinal(ctx[0], intermediate, &len); |
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|
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EVP_DigestUpdate(ctx[1], intermediate, sizeof(intermediate)); |
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EVP_DigestFinal(ctx[1], output, &len); |
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|
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EVP_MD_CTX_free(ctx[0]); |
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EVP_MD_CTX_free(ctx[1]); |
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} |
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|
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// from sshsha.c (ver 0.70) hmac_sha1_simple |
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// sshauxcrypt.c (ver 0.75) mac_simple, and modifled |
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// - use OpenSSL function |
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// - use EVP_MD instead of ssh2_macalg |
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void mac_simple(const EVP_MD *md, |
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unsigned char *key, int keylen, void *data, int datalen, |
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unsigned char *output) |
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{ |
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EVP_MD_CTX *ctx[2] = {0, 0}; |
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unsigned char intermediate[32]; // sha1: 160bit / sha256: 256bit |
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unsigned char foo[64]; // block size ... sha1: 512bit / sha256: 512bit |
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int i; |
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unsigned int len; |
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|
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ctx[0] = EVP_MD_CTX_new(); |
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if (ctx[0] == NULL) { |
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return; |
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} |
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ctx[1] = EVP_MD_CTX_new(); |
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if (ctx[1] == NULL) { |
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EVP_MD_CTX_free(ctx[0]); |
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return; |
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} |
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|
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memset(foo, 0x36, sizeof(foo)); |
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for (i = 0; i < keylen && i < sizeof(foo); i++) { |
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foo[i] ^= key[i]; |
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} |
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EVP_DigestInit(ctx[0], md); |
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EVP_DigestUpdate(ctx[0], foo, sizeof(foo)); |
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|
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memset(foo, 0x5C, sizeof(foo)); |
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for (i = 0; i < keylen && i < sizeof(foo); i++) { |
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foo[i] ^= key[i]; |
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} |
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EVP_DigestInit(ctx[1], md); |
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EVP_DigestUpdate(ctx[1], foo, sizeof(foo)); |
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|
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memset(foo, 0, sizeof(foo)); |
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|
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EVP_DigestUpdate(ctx[0], data, datalen); |
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EVP_DigestFinal(ctx[0], intermediate, &len); |
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|
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EVP_DigestUpdate(ctx[1], intermediate, EVP_MD_size(md)); |
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EVP_DigestFinal(ctx[1], output, &len); |
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|
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EVP_MD_CTX_free(ctx[0]); |
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EVP_MD_CTX_free(ctx[1]); |
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} |
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|
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// from sshpubk.c (ver 0.75), and modifled |
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// - delete unnecessary paramters |
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// - use char ** and int * instead of ptrlen |
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// - use buffer_t instead of strbuf |
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// - use OpenSSL function |
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// - use argon2 function |
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void ssh2_ppk_derive_keys( |
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unsigned fmt_version, const struct ssh2cipher* ciphertype, |
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unsigned char *passphrase, buffer_t *storage, |
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unsigned char **cipherkey, unsigned int *cipherkey_len, |
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unsigned char **cipheriv, unsigned int *cipheriv_len, |
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unsigned char **mackey, unsigned int *mackey_len, |
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ppk_argon2_parameters *params) |
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{ |
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size_t mac_keylen = 0; |
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u_int ivlen; |
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unsigned int cipherkey_offset = 0; |
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|
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ivlen = (ciphertype->iv_len == 0) ? ciphertype->block_size : ciphertype->iv_len; |
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|
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switch (fmt_version) { |
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case 3: { |
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uint32_t taglen; |
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unsigned char *tag; |
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|
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if (ciphertype->key_len == 0) { |
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mac_keylen = 0; |
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break; |
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} |
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mac_keylen = 32; |
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taglen = ciphertype->key_len + ivlen + mac_keylen; |
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tag = (char *)malloc(taglen); |
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|
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argon2_hash(params->argon2_passes, params->argon2_mem, |
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params->argon2_parallelism, |
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passphrase, strlen(passphrase), |
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params->salt, params->saltlen, |
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tag, taglen, |
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NULL, 0, |
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params->type, 0x13); |
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buffer_append(storage, tag, taglen); |
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|
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free(tag); |
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|
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break; |
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} |
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case 2: { |
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unsigned ctr; |
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const EVP_MD *md = EVP_sha1(); |
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EVP_MD_CTX *ctx = NULL; |
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unsigned char u[4], buf[20]; // SHA1: 20byte |
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unsigned int i, len, cipherkey_write_byte = 0; |
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|
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ctx = EVP_MD_CTX_new(); |
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|
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/* Counter-mode iteration to generate cipher key data. */ |
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for (ctr = 0; ctr * 20 < ciphertype->key_len; ctr++) { |
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EVP_DigestInit(ctx, md); |
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set_uint32_MSBfirst(u, ctr); |
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EVP_DigestUpdate(ctx, u, 4); |
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EVP_DigestUpdate(ctx, passphrase, strlen(passphrase)); |
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EVP_DigestFinal(ctx, buf, &len); |
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buffer_append(storage, buf, 20); |
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cipherkey_write_byte += 20; |
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} |
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// TTSSH �� buffer_t ���� shrink �������������������A |
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// shrink ������ 40byte ������ 32byte �������g�� |
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cipherkey_offset = cipherkey_write_byte - ciphertype->key_len; |
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|
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/* In this version of the format, the CBC IV was always all 0. */ |
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for (i = 0; i < ivlen; i++) { |
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buffer_put_char(storage, 0); |
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} |
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|
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/* Completely separate hash for the MAC key. */ |
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EVP_DigestInit(ctx, md); |
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mac_keylen = EVP_MD_size(md); // SHA1: 20byte |
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EVP_DigestUpdate(ctx, "putty-private-key-file-mac-key", 30); |
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EVP_DigestUpdate(ctx, passphrase, strlen(passphrase)); |
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EVP_DigestFinal(ctx, buf, &len); |
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buffer_append(storage, buf, mac_keylen); |
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|
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EVP_MD_CTX_free(ctx); |
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|
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break; |
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} |
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} |
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|
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*cipherkey = storage->buf; |
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*cipherkey_len = ciphertype->key_len; |
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*cipheriv = storage->buf + ciphertype->key_len + cipherkey_offset; |
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*cipheriv_len = ivlen; |
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*mackey = storage->buf + ciphertype->key_len + cipherkey_offset + ivlen; |
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*mackey_len = mac_keylen; |
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} |
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