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Diffstat (limited to 'src/libstrongswan/asn1/pem.c')
-rwxr-xr-xsrc/libstrongswan/asn1/pem.c393
1 files changed, 0 insertions, 393 deletions
diff --git a/src/libstrongswan/asn1/pem.c b/src/libstrongswan/asn1/pem.c
deleted file mode 100755
index 059795548..000000000
--- a/src/libstrongswan/asn1/pem.c
+++ /dev/null
@@ -1,393 +0,0 @@
-/*
- * Copyright (C) 2001-2008 Andreas Steffen
- *
- * Hochschule fuer Technik Rapperswil
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2 of the License, or (at your
- * option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
- * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
- * for more details.
- */
-
-#include <stdio.h>
-#include <stdlib.h>
-#include <unistd.h>
-#include <errno.h>
-#include <string.h>
-#include <stddef.h>
-#include <sys/types.h>
-
-#include "pem.h"
-
-#include <library.h>
-#include <debug.h>
-#include <asn1/asn1.h>
-
-#include <utils/lexparser.h>
-#include <crypto/hashers/hasher.h>
-#include <crypto/crypters/crypter.h>
-
-#define PKCS5_SALT_LEN 8 /* bytes */
-
-/**
- * check the presence of a pattern in a character string
- */
-static bool present(const char* pattern, chunk_t* ch)
-{
- u_int pattern_len = strlen(pattern);
-
- if (ch->len >= pattern_len && strneq(ch->ptr, pattern, pattern_len))
- {
- ch->ptr += pattern_len;
- ch->len -= pattern_len;
- return TRUE;
- }
- return FALSE;
-}
-
-/**
- * find a boundary of the form -----tag name-----
- */
-static bool find_boundary(const char* tag, chunk_t *line)
-{
- chunk_t name = chunk_empty;
-
- if (!present("-----", line))
- return FALSE;
- if (!present(tag, line))
- return FALSE;
- if (*line->ptr != ' ')
- return FALSE;
- line->ptr++; line->len--;
-
- /* extract name */
- name.ptr = line->ptr;
- while (line->len > 0)
- {
- if (present("-----", line))
- {
- DBG2(" -----%s %.*s-----", tag, (int)name.len, name.ptr);
- return TRUE;
- }
- line->ptr++; line->len--; name.len++;
- }
- return FALSE;
-}
-
-/*
- * decrypts a passphrase protected encrypted data block
- */
-static status_t pem_decrypt(chunk_t *blob, encryption_algorithm_t alg, size_t key_size,
- chunk_t *iv, chunk_t passphrase)
-{
- hasher_t *hasher;
- crypter_t *crypter;
- chunk_t salt = { iv->ptr, PKCS5_SALT_LEN };
- chunk_t hash;
- chunk_t decrypted;
- chunk_t key = {alloca(key_size), key_size};
- u_int8_t padding, *last_padding_pos, *first_padding_pos;
-
- if (passphrase.len == 0)
- {
- DBG1(" missing passphrase");
- return INVALID_ARG;
- }
-
- /* build key from passphrase and IV */
- hasher = lib->crypto->create_hasher(lib->crypto, HASH_MD5);
- if (hasher == NULL)
- {
- DBG1(" MD5 hash algorithm not available");
- return NOT_SUPPORTED;
- }
- hash.len = hasher->get_hash_size(hasher);
- hash.ptr = alloca(hash.len);
- hasher->get_hash(hasher, passphrase, NULL);
- hasher->get_hash(hasher, salt, hash.ptr);
- memcpy(key.ptr, hash.ptr, hash.len);
-
- if (key.len > hash.len)
- {
- hasher->get_hash(hasher, hash, NULL);
- hasher->get_hash(hasher, passphrase, NULL);
- hasher->get_hash(hasher, salt, hash.ptr);
- memcpy(key.ptr + hash.len, hash.ptr, key.len - hash.len);
- }
- hasher->destroy(hasher);
-
- /* decrypt blob */
- crypter = lib->crypto->create_crypter(lib->crypto, alg, key_size);
- if (crypter == NULL)
- {
- DBG1(" %N encryption algorithm not available",
- encryption_algorithm_names, alg);
- return NOT_SUPPORTED;
- }
- crypter->set_key(crypter, key);
-
- if (iv->len != crypter->get_block_size(crypter) ||
- blob->len % iv->len)
- {
- crypter->destroy(crypter);
- DBG1(" data size is not multiple of block size");
- return PARSE_ERROR;
- }
- crypter->decrypt(crypter, *blob, *iv, &decrypted);
- crypter->destroy(crypter);
- memcpy(blob->ptr, decrypted.ptr, blob->len);
- chunk_free(&decrypted);
-
- /* determine amount of padding */
- last_padding_pos = blob->ptr + blob->len - 1;
- padding = *last_padding_pos;
- first_padding_pos = (padding > blob->len) ? blob->ptr : last_padding_pos - padding;
-
- /* check the padding pattern */
- while (--last_padding_pos > first_padding_pos)
- {
- if (*last_padding_pos != padding)
- {
- DBG1(" invalid passphrase");
- return INVALID_ARG;
- }
- }
- /* remove padding */
- blob->len -= padding;
- return SUCCESS;
-}
-
-/* Converts a PEM encoded file into its binary form
- *
- * RFC 1421 Privacy Enhancement for Electronic Mail, February 1993
- * RFC 934 Message Encapsulation, January 1985
- */
-status_t pem_to_bin(chunk_t *blob, chunk_t passphrase, bool *pgp)
-{
- typedef enum {
- PEM_PRE = 0,
- PEM_MSG = 1,
- PEM_HEADER = 2,
- PEM_BODY = 3,
- PEM_POST = 4,
- PEM_ABORT = 5
- } state_t;
-
- encryption_algorithm_t alg = ENCR_UNDEFINED;
- size_t key_size = 0;
-
- bool encrypted = FALSE;
-
- state_t state = PEM_PRE;
-
- chunk_t src = *blob;
- chunk_t dst = *blob;
- chunk_t line = chunk_empty;
- chunk_t iv = chunk_empty;
-
- u_char iv_buf[16]; /* MD5 digest size */
-
- /* zero size of converted blob */
- dst.len = 0;
-
- /* zero size of IV */
- iv.ptr = iv_buf;
- iv.len = 0;
-
- while (fetchline(&src, &line))
- {
- if (state == PEM_PRE)
- {
- if (find_boundary("BEGIN", &line))
- {
- state = PEM_MSG;
- }
- continue;
- }
- else
- {
- if (find_boundary("END", &line))
- {
- state = PEM_POST;
- break;
- }
- if (state == PEM_MSG)
- {
- state = (memchr(line.ptr, ':', line.len) == NULL) ? PEM_BODY : PEM_HEADER;
- }
- if (state == PEM_HEADER)
- {
- err_t ugh = NULL;
- chunk_t name = chunk_empty;
- chunk_t value = chunk_empty;
-
- /* an empty line separates HEADER and BODY */
- if (line.len == 0)
- {
- state = PEM_BODY;
- continue;
- }
-
- /* we are looking for a parameter: value pair */
- DBG2(" %.*s", (int)line.len, line.ptr);
- ugh = extract_parameter_value(&name, &value, &line);
- if (ugh != NULL)
- {
- continue;
- }
- if (match("Proc-Type", &name) && *value.ptr == '4')
- {
- encrypted = TRUE;
- }
- else if (match("DEK-Info", &name))
- {
- chunk_t dek;
-
- if (!extract_token(&dek, ',', &value))
- {
- dek = value;
- }
- if (match("DES-EDE3-CBC", &dek))
- {
- alg = ENCR_3DES;
- key_size = 24;
- }
- else if (match("AES-128-CBC", &dek))
- {
- alg = ENCR_AES_CBC;
- key_size = 16;
- }
- else if (match("AES-192-CBC", &dek))
- {
- alg = ENCR_AES_CBC;
- key_size = 24;
- }
- else if (match("AES-256-CBC", &dek))
- {
- alg = ENCR_AES_CBC;
- key_size = 32;
- }
- else
- {
- DBG1(" encryption algorithm '%.s' not supported",
- dek.len, dek.ptr);
- return NOT_SUPPORTED;
- }
- eat_whitespace(&value);
- iv = chunk_from_hex(value, iv.ptr);
- }
- }
- else /* state is PEM_BODY */
- {
- chunk_t data;
-
- /* remove any trailing whitespace */
- if (!extract_token(&data ,' ', &line))
- {
- data = line;
- }
-
- /* check for PGP armor checksum */
- if (*data.ptr == '=')
- {
- *pgp = TRUE;
- data.ptr++;
- data.len--;
- DBG2(" armor checksum: %.*s", (int)data.len, data.ptr);
- continue;
- }
-
- if (blob->len - dst.len < data.len / 4 * 3)
- {
- state = PEM_ABORT;
- }
- data = chunk_from_base64(data, dst.ptr);
-
- dst.ptr += data.len;
- dst.len += data.len;
- }
- }
- }
- /* set length to size of binary blob */
- blob->len = dst.len;
-
- if (state != PEM_POST)
- {
- DBG1(" file coded in unknown format, discarded");
- return PARSE_ERROR;
- }
- if (!encrypted)
- {
- return SUCCESS;
- }
- return pem_decrypt(blob, alg, key_size, &iv, passphrase);
-
-}
-
-/* load a coded key or certificate file with autodetection
- * of binary DER or base64 PEM ASN.1 formats and armored PGP format
- */
-bool pem_asn1_load_file(char *filename, chunk_t *passphrase,
- chunk_t *blob, bool *pgp)
-{
- FILE *fd = fopen(filename, "r");
-
- if (fd)
- {
- chunk_t pass = chunk_empty;
- int bytes;
-
- fseek(fd, 0, SEEK_END );
- blob->len = ftell(fd);
- rewind(fd);
- blob->ptr = malloc(blob->len);
- bytes = fread(blob->ptr, 1, blob->len, fd);
- fclose(fd);
- DBG2(" loading '%s' (%d bytes)", filename, bytes);
-
- *pgp = FALSE;
-
- /* try DER format */
- if (is_asn1(*blob))
- {
- DBG2(" file coded in DER format");
- return TRUE;
- }
-
- if (passphrase != NULL)
- {
- pass = *passphrase;
- DBG4(" passphrase: %#B", passphrase);
- }
-
- /* try PEM format */
- if (pem_to_bin(blob, pass, pgp) == SUCCESS)
- {
- if (*pgp)
- {
- DBG2(" file coded in armored PGP format");
- return TRUE;
- }
- if (is_asn1(*blob))
- {
- DBG2(" file coded in PEM format");
- return TRUE;
- }
- DBG1(" file coded in unknown format, discarded");
- }
-
- /* a conversion error has occured */
- chunk_free(blob);
- }
- else
- {
- DBG1(" reading file '%s' failed", filename);
- }
- return FALSE;
-}
-
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