diff options
Diffstat (limited to 'libnm-core/nm-crypto.c')
| -rw-r--r-- | libnm-core/nm-crypto.c | 1032 |
1 files changed, 1032 insertions, 0 deletions
diff --git a/libnm-core/nm-crypto.c b/libnm-core/nm-crypto.c new file mode 100644 index 00000000..dc8f1c15 --- /dev/null +++ b/libnm-core/nm-crypto.c @@ -0,0 +1,1032 @@ +/* -*- Mode: C; tab-width: 4; indent-tabs-mode: t; c-basic-offset: 4 -*- */ + +/* + * Dan Williams <dcbw@redhat.com> + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This library 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 + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with this library; if not, write to the + * Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, + * Boston, MA 02110-1301 USA. + * + * Copyright 2007 - 2018 Red Hat, Inc. + */ + +#include "nm-default.h" + +#include "nm-crypto.h" + +#include <string.h> +#include <strings.h> +#include <unistd.h> +#include <stdlib.h> + +#include "nm-utils/nm-secret-utils.h" +#include "nm-utils/nm-io-utils.h" + +#include "nm-crypto-impl.h" +#include "nm-utils.h" +#include "nm-errors.h" + +#define PEM_RSA_KEY_BEGIN "-----BEGIN RSA PRIVATE KEY-----" +#define PEM_RSA_KEY_END "-----END RSA PRIVATE KEY-----" + +#define PEM_DSA_KEY_BEGIN "-----BEGIN DSA PRIVATE KEY-----" +#define PEM_DSA_KEY_END "-----END DSA PRIVATE KEY-----" + +#define PEM_CERT_BEGIN "-----BEGIN CERTIFICATE-----" +#define PEM_CERT_END "-----END CERTIFICATE-----" + +#define PEM_PKCS8_ENC_KEY_BEGIN "-----BEGIN ENCRYPTED PRIVATE KEY-----" +#define PEM_PKCS8_ENC_KEY_END "-----END ENCRYPTED PRIVATE KEY-----" + +#define PEM_PKCS8_DEC_KEY_BEGIN "-----BEGIN PRIVATE KEY-----" +#define PEM_PKCS8_DEC_KEY_END "-----END PRIVATE KEY-----" + +/*****************************************************************************/ + +static const NMCryptoCipherInfo cipher_infos[] = { +#define _CI(_cipher, _name, _digest_len, _real_iv_len) \ + [(_cipher) - 1] = { .cipher = _cipher, .name = ""_name"", .digest_len = _digest_len, .real_iv_len = _real_iv_len } + _CI (NM_CRYPTO_CIPHER_DES_EDE3_CBC, "DES-EDE3-CBC", 24, 8), + _CI (NM_CRYPTO_CIPHER_DES_CBC, "DES-CBC", 8, 8), + _CI (NM_CRYPTO_CIPHER_AES_128_CBC, "AES-128-CBC", 16, 16), + _CI (NM_CRYPTO_CIPHER_AES_192_CBC, "AES-192-CBC", 24, 16), + _CI (NM_CRYPTO_CIPHER_AES_256_CBC, "AES-256-CBC", 32, 16), +}; + +const NMCryptoCipherInfo * +nm_crypto_cipher_get_info (NMCryptoCipherType cipher) +{ + g_return_val_if_fail (cipher > NM_CRYPTO_CIPHER_UNKNOWN && (gsize) cipher < G_N_ELEMENTS (cipher_infos) + 1, NULL); + +#if NM_MORE_ASSERTS > 10 + { + int i, j; + + for (i = 0; i < (int) G_N_ELEMENTS (cipher_infos); i++) { + const NMCryptoCipherInfo *info = &cipher_infos[i]; + + nm_assert (info->cipher == (NMCryptoCipherType) (i + 1)); + nm_assert (info->name && info->name[0]); + for (j = 0; j < i; j++) + nm_assert (g_ascii_strcasecmp (info->name, cipher_infos[j].name) != 0); + } + } +#endif + + return &cipher_infos[cipher - 1]; +} + +const NMCryptoCipherInfo * +nm_crypto_cipher_get_info_by_name (const char *cipher_name, gssize p_len) +{ + int i; + + nm_assert (nm_crypto_cipher_get_info (NM_CRYPTO_CIPHER_DES_CBC)->cipher == NM_CRYPTO_CIPHER_DES_CBC); + + if (p_len < 0) { + if (!cipher_name) + return FALSE; + p_len = strlen (cipher_name); + } + + for (i = 0; i < (int) G_N_ELEMENTS (cipher_infos); i++) { + const NMCryptoCipherInfo *info = &cipher_infos[i]; + + if ( (gsize) p_len == strlen (info->name) + && g_ascii_strncasecmp (info->name, cipher_name, p_len) == 0) + return info; + } + return NULL; +} + +/*****************************************************************************/ + +static gboolean +find_tag (const char *tag, + const guint8 *data, + gsize data_len, + gsize start_at, + gsize *out_pos) +{ + gsize i, taglen; + gsize len = data_len - start_at; + + g_return_val_if_fail (out_pos != NULL, FALSE); + + taglen = strlen (tag); + if (len >= taglen) { + for (i = 0; i < len - taglen + 1; i++) { + if (memcmp (data + start_at + i, tag, taglen) == 0) { + *out_pos = start_at + i; + return TRUE; + } + } + } + return FALSE; +} + +#define DEK_INFO_TAG "DEK-Info: " +#define PROC_TYPE_TAG "Proc-Type: " + +static char * +_extract_line (const guint8 **p, const guint8 *p_end) +{ + const guint8 *x, *x0; + + nm_assert (p); + nm_assert (p_end); + nm_assert (*p); + nm_assert (*p < p_end); + + x = x0 = *p; + while (TRUE) { + if (x == p_end) { + *p = p_end; + break; + } + if (*x == '\0') { + /* the data contains embedded NUL. This is the end. */ + *p = p_end; + break; + } + if (*x == '\n') { + *p = x + 1; + break; + } + x++; + } + + if (x == x0) + return NULL; + return g_strndup ((char *) x0, x - x0); +} + +static gboolean +parse_old_openssl_key_file (const guint8 *data, + gsize data_len, + NMSecretPtr *out_parsed, + NMCryptoKeyType *out_key_type, + NMCryptoCipherType *out_cipher, + char **out_iv, + GError **error) +{ + gsize start = 0, end = 0; + nm_auto_free_secret char *str = NULL; + char *str_p; + gsize str_len; + int enc_tags = 0; + NMCryptoKeyType key_type; + nm_auto_clear_secret_ptr NMSecretPtr parsed = { 0 }; + nm_auto_free_secret char *iv = NULL; + NMCryptoCipherType cipher = NM_CRYPTO_CIPHER_UNKNOWN; + const char *start_tag; + const char *end_tag; + const guint8 *data_start, *data_end; + + nm_assert (!out_parsed || (out_parsed->len == 0 && !out_parsed->bin)); + nm_assert (!out_iv || !*out_iv); + + NM_SET_OUT (out_key_type, NM_CRYPTO_KEY_TYPE_UNKNOWN); + NM_SET_OUT (out_cipher, NM_CRYPTO_CIPHER_UNKNOWN); + + if (find_tag (PEM_RSA_KEY_BEGIN, data, data_len, 0, &start)) { + key_type = NM_CRYPTO_KEY_TYPE_RSA; + start_tag = PEM_RSA_KEY_BEGIN; + end_tag = PEM_RSA_KEY_END; + } else if (find_tag (PEM_DSA_KEY_BEGIN, data, data_len, 0, &start)) { + key_type = NM_CRYPTO_KEY_TYPE_DSA; + start_tag = PEM_DSA_KEY_BEGIN; + end_tag = PEM_DSA_KEY_END; + } else { + g_set_error (error, NM_CRYPTO_ERROR, + NM_CRYPTO_ERROR_INVALID_DATA, + _("PEM key file had no start tag")); + return FALSE; + } + + start += strlen (start_tag); + if (!find_tag (end_tag, data, data_len, start, &end)) { + g_set_error (error, NM_CRYPTO_ERROR, + NM_CRYPTO_ERROR_INVALID_DATA, + _("PEM key file had no end tag '%s'."), + end_tag); + return FALSE; + } + + str_len = end - start + 1; + str = g_new (char, str_len); + str[0] = '\0'; + str_p = str; + + data_start = &data[start]; + data_end = &data[end]; + + while (data_start < data_end) { + nm_auto_free_secret char *line = NULL; + char *p; + + line = _extract_line (&data_start, data_end); + if (!line) + continue; + + p = nm_secret_strchomp (nm_str_skip_leading_spaces (line)); + + if (!strncmp (p, PROC_TYPE_TAG, strlen (PROC_TYPE_TAG))) { + if (enc_tags++ != 0 || str_p != str) { + g_set_error (error, NM_CRYPTO_ERROR, + NM_CRYPTO_ERROR_INVALID_DATA, + _("Malformed PEM file: Proc-Type was not first tag.")); + return FALSE; + } + + p += strlen (PROC_TYPE_TAG); + if (strcmp (p, "4,ENCRYPTED")) { + g_set_error (error, NM_CRYPTO_ERROR, + NM_CRYPTO_ERROR_INVALID_DATA, + _("Malformed PEM file: unknown Proc-Type tag '%s'."), + p); + return FALSE; + } + } else if (!strncmp (p, DEK_INFO_TAG, strlen (DEK_INFO_TAG))) { + const NMCryptoCipherInfo *cipher_info; + char *comma; + gsize p_len; + + if (enc_tags++ != 1 || str_p != str) { + g_set_error (error, NM_CRYPTO_ERROR, + NM_CRYPTO_ERROR_INVALID_DATA, + _("Malformed PEM file: DEK-Info was not the second tag.")); + return FALSE; + } + + p += strlen (DEK_INFO_TAG); + + /* Grab the IV first */ + comma = strchr (p, ','); + if (!comma || (*(comma + 1) == '\0')) { + g_set_error (error, NM_CRYPTO_ERROR, + NM_CRYPTO_ERROR_INVALID_DATA, + _("Malformed PEM file: no IV found in DEK-Info tag.")); + return FALSE; + } + p_len = comma - p; + comma++; + if (!g_ascii_isxdigit (*comma)) { + g_set_error (error, NM_CRYPTO_ERROR, + NM_CRYPTO_ERROR_INVALID_DATA, + _("Malformed PEM file: invalid format of IV in DEK-Info tag.")); + return FALSE; + } + nm_free_secret (iv); + iv = g_strdup (comma); + + /* Get the private key cipher */ + cipher_info = nm_crypto_cipher_get_info_by_name (p, p_len); + if (!cipher_info) { + g_set_error (error, NM_CRYPTO_ERROR, + NM_CRYPTO_ERROR_INVALID_DATA, + _("Malformed PEM file: unknown private key cipher '%s'."), + p); + return FALSE; + } + cipher = cipher_info->cipher; + } else { + if (enc_tags == 1) { + g_set_error (error, NM_CRYPTO_ERROR, + NM_CRYPTO_ERROR_INVALID_DATA, + "Malformed PEM file: both Proc-Type and DEK-Info tags are required."); + return FALSE; + } + nm_utils_strbuf_append_str (&str_p, &str_len, p); + nm_assert (str_len > 0); + } + } + + parsed.bin = (guint8 *) g_base64_decode (str, &parsed.len); + if (!parsed.bin || parsed.len == 0) { + g_set_error (error, NM_CRYPTO_ERROR, + NM_CRYPTO_ERROR_INVALID_DATA, + _("Could not decode private key.")); + nm_secret_ptr_clear (&parsed); + return FALSE; + } + + NM_SET_OUT (out_key_type, key_type); + NM_SET_OUT (out_iv, g_steal_pointer (&iv)); + NM_SET_OUT (out_cipher, cipher); + nm_secret_ptr_move (out_parsed, &parsed); + return TRUE; +} + +static gboolean +parse_pkcs8_key_file (const guint8 *data, + gsize data_len, + NMSecretPtr *parsed, + gboolean *out_encrypted, + GError **error) +{ + gsize start = 0, end = 0; + const char *start_tag = NULL, *end_tag = NULL; + gboolean encrypted = FALSE; + nm_auto_free_secret char *der_base64 = NULL; + + nm_assert (parsed); + nm_assert (!parsed->bin); + nm_assert (parsed->len == 0); + nm_assert (out_encrypted); + + /* Try encrypted first, decrypted next */ + if (find_tag (PEM_PKCS8_ENC_KEY_BEGIN, data, data_len, 0, &start)) { + start_tag = PEM_PKCS8_ENC_KEY_BEGIN; + end_tag = PEM_PKCS8_ENC_KEY_END; + encrypted = TRUE; + } else if (find_tag (PEM_PKCS8_DEC_KEY_BEGIN, data, data_len, 0, &start)) { + start_tag = PEM_PKCS8_DEC_KEY_BEGIN; + end_tag = PEM_PKCS8_DEC_KEY_END; + encrypted = FALSE; + } else { + g_set_error_literal (error, NM_CRYPTO_ERROR, + NM_CRYPTO_ERROR_INVALID_DATA, + _("Failed to find expected PKCS#8 start tag.")); + return FALSE; + } + + start += strlen (start_tag); + if (!find_tag (end_tag, data, data_len, start, &end)) { + g_set_error (error, NM_CRYPTO_ERROR, + NM_CRYPTO_ERROR_INVALID_DATA, + _("Failed to find expected PKCS#8 end tag '%s'."), + end_tag); + return FALSE; + } + + /* g_base64_decode() wants a NULL-terminated string */ + der_base64 = g_strndup ((char *) &data[start], end - start); + + parsed->bin = (guint8 *) g_base64_decode (der_base64, &parsed->len); + if (!parsed->bin || parsed->len == 0) { + g_set_error_literal (error, NM_CRYPTO_ERROR, + NM_CRYPTO_ERROR_INVALID_DATA, + _("Failed to decode PKCS#8 private key.")); + nm_secret_ptr_clear (parsed); + return FALSE; + } + + *out_encrypted = encrypted; + return TRUE; +} + +static gboolean +file_read_contents (const char *filename, + NMSecretPtr *out_contents, + GError **error) +{ + nm_assert (out_contents); + nm_assert (out_contents->len == 0); + nm_assert (!out_contents->str); + + return nm_utils_file_get_contents (-1, + filename, + 100*1024*1024, + NM_UTILS_FILE_GET_CONTENTS_FLAG_SECRET, + &out_contents->str, + &out_contents->len, + error) >= 0; +} + +GBytes * +nm_crypto_read_file (const char *filename, + GError **error) +{ + nm_auto_clear_secret_ptr NMSecretPtr contents = { 0 }; + + g_return_val_if_fail (filename, NULL); + + if (!file_read_contents (filename, &contents, error)) + return NULL; + return nm_secret_copy_to_gbytes (contents.bin, contents.len); +} + +/* + * Convert a hex string into bytes. + */ +static guint8 * +_nmtst_convert_iv (const char *src, + gsize *out_len, + GError **error) +{ + gsize i, num; + gs_free guint8 *c = NULL; + int c0, c1; + + nm_assert (src); + + num = strlen (src); + if ( num == 0 + || (num % 2) != 0) { + g_set_error (error, NM_CRYPTO_ERROR, + NM_CRYPTO_ERROR_INVALID_DATA, + _("IV must be an even number of bytes in length.")); + return NULL; + } + + num /= 2; + c = g_malloc (num + 1); + + /* defensively add trailing NUL. This function returns binary data, + * do not assume it's NUL terminated. */ + c[num] = '\0'; + + for (i = 0; i < num; i++) { + if ( ((c0 = nm_utils_hexchar_to_int (*(src++))) < 0) + || ((c1 = nm_utils_hexchar_to_int (*(src++))) < 0)) { + g_set_error (error, NM_CRYPTO_ERROR, + NM_CRYPTO_ERROR_INVALID_DATA, + _("IV contains non-hexadecimal digits.")); + nm_explicit_bzero (c, i); + return FALSE; + } + + c[i] = (c0 << 4) + c1; + } + *out_len = num; + return g_steal_pointer (&c); +} + +guint8 * +nmtst_crypto_make_des_aes_key (NMCryptoCipherType cipher, + const guint8 *salt, + gsize salt_len, + const char *password, + gsize *out_len, + GError **error) +{ + guint8 *key; + const NMCryptoCipherInfo *cipher_info; + + g_return_val_if_fail (salt != NULL, NULL); + g_return_val_if_fail (salt_len >= 8, NULL); + g_return_val_if_fail (password != NULL, NULL); + g_return_val_if_fail (out_len != NULL, NULL); + + *out_len = 0; + + cipher_info = nm_crypto_cipher_get_info (cipher); + + g_return_val_if_fail (cipher_info, NULL); + + if (password[0] == '\0') + return NULL; + + key = g_malloc (cipher_info->digest_len); + + nm_crypto_md5_hash (salt, + 8, + (guint8 *) password, + strlen (password), + key, + cipher_info->digest_len); + + *out_len = cipher_info->digest_len; + return key; +} + +static gboolean +_nmtst_decrypt_key (NMCryptoCipherType cipher, + const guint8 *data, + gsize data_len, + const char *iv, + const char *password, + NMSecretPtr *parsed, + GError **error) +{ + nm_auto_clear_secret_ptr NMSecretPtr bin_iv = { 0 }; + nm_auto_clear_secret_ptr NMSecretPtr key = { 0 }; + + nm_assert (password); + nm_assert (cipher != NM_CRYPTO_CIPHER_UNKNOWN); + nm_assert (iv); + nm_assert (parsed); + nm_assert (!parsed->bin); + nm_assert (parsed->len == 0); + + bin_iv.bin = _nmtst_convert_iv (iv, &bin_iv.len, error); + if (!bin_iv.bin) + return FALSE; + + if (bin_iv.len < 8) { + g_set_error (error, + NM_CRYPTO_ERROR, + NM_CRYPTO_ERROR_INVALID_DATA, + _("IV must contain at least 8 characters")); + return FALSE; + } + + /* Convert the password and IV into a DES or AES key */ + key.bin = nmtst_crypto_make_des_aes_key (cipher, bin_iv.bin, bin_iv.len, password, &key.len, error); + if (!key.bin || !key.len) + return FALSE; + + parsed->bin = _nmtst_crypto_decrypt (cipher, + data, + data_len, + bin_iv.bin, + bin_iv.len, + key.bin, + key.len, + &parsed->len, + error); + if (!parsed->bin || parsed->len == 0) { + nm_secret_ptr_clear (parsed); + return FALSE; + } + + return TRUE; +} + +GBytes * +nmtst_crypto_decrypt_openssl_private_key_data (const guint8 *data, + gsize data_len, + const char *password, + NMCryptoKeyType *out_key_type, + GError **error) +{ + NMCryptoKeyType key_type = NM_CRYPTO_KEY_TYPE_UNKNOWN; + nm_auto_clear_secret_ptr NMSecretPtr parsed = { 0 }; + nm_auto_free_secret char *iv = NULL; + NMCryptoCipherType cipher = NM_CRYPTO_CIPHER_UNKNOWN; + + g_return_val_if_fail (data != NULL, NULL); + + NM_SET_OUT (out_key_type, NM_CRYPTO_KEY_TYPE_UNKNOWN); + + if (!_nm_crypto_init (error)) + return NULL; + + if (!parse_old_openssl_key_file (data, data_len, &parsed, &key_type, &cipher, &iv, NULL)) { + g_set_error (error, NM_CRYPTO_ERROR, + NM_CRYPTO_ERROR_INVALID_DATA, + _("Unable to determine private key type.")); + return NULL; + } + + NM_SET_OUT (out_key_type, key_type); + + if (password) { + nm_auto_clear_secret_ptr NMSecretPtr parsed2 = { 0 }; + + if (cipher == NM_CRYPTO_CIPHER_UNKNOWN || !iv) { + g_set_error (error, NM_CRYPTO_ERROR, + NM_CRYPTO_ERROR_INVALID_PASSWORD, + _("Password provided, but key was not encrypted.")); + return NULL; + } + + if (!_nmtst_decrypt_key (cipher, + parsed.bin, + parsed.len, + iv, + password, + &parsed2, + error)) + return NULL; + + return nm_secret_copy_to_gbytes (parsed2.bin, parsed2.len); + } + + if (cipher != NM_CRYPTO_CIPHER_UNKNOWN || iv) + return NULL; + + return nm_secret_copy_to_gbytes (parsed.bin, parsed.len); +} + +GBytes * +nmtst_crypto_decrypt_openssl_private_key (const char *file, + const char *password, + NMCryptoKeyType *out_key_type, + GError **error) +{ + nm_auto_clear_secret_ptr NMSecretPtr contents = { 0 }; + + if (!_nm_crypto_init (error)) + return NULL; + + if (!file_read_contents (file, &contents, error)) + return NULL; + + return nmtst_crypto_decrypt_openssl_private_key_data (contents.bin, + contents.len, + password, + out_key_type, + error); +} + +static gboolean +extract_pem_cert_data (const guint8 *contents, + gsize contents_len, + NMSecretPtr *out_cert, + GError **error) +{ + gsize start = 0; + gsize end = 0; + nm_auto_free_secret char *der_base64 = NULL; + + nm_assert (contents); + nm_assert (out_cert); + nm_assert (out_cert->len == 0); + nm_assert (!out_cert->ptr); + + if (!find_tag (PEM_CERT_BEGIN, contents, contents_len, 0, &start)) { + g_set_error (error, NM_CRYPTO_ERROR, + NM_CRYPTO_ERROR_INVALID_DATA, + _("PEM certificate had no start tag '%s'."), + PEM_CERT_BEGIN); + return FALSE; + } + + start += strlen (PEM_CERT_BEGIN); + if (!find_tag (PEM_CERT_END, contents, contents_len, start, &end)) { + g_set_error (error, NM_CRYPTO_ERROR, + NM_CRYPTO_ERROR_INVALID_DATA, + _("PEM certificate had no end tag '%s'."), + PEM_CERT_END); + return FALSE; + } + + /* g_base64_decode() wants a NULL-terminated string */ + der_base64 = g_strndup ((const char *) &contents[start], end - start); + + out_cert->bin = (guint8 *) g_base64_decode (der_base64, &out_cert->len); + if (!out_cert->bin || !out_cert->len) { + g_set_error (error, NM_CRYPTO_ERROR, + NM_CRYPTO_ERROR_INVALID_DATA, + _("Failed to decode certificate.")); + nm_secret_ptr_clear (out_cert); + return FALSE; + } + + return TRUE; +} + +gboolean +nm_crypto_load_and_verify_certificate (const char *file, + NMCryptoFileFormat *out_file_format, + GBytes **out_certificate, + GError **error) +{ + nm_auto_clear_secret_ptr NMSecretPtr contents = { 0 }; + + g_return_val_if_fail (file, FALSE); + nm_assert (!error || !*error); + + if (!_nm_crypto_init (error)) + goto out; + + if (!file_read_contents (file, &contents, error)) + goto out; + + if (contents.len == 0) { + g_set_error (error, + NM_CRYPTO_ERROR, + NM_CRYPTO_ERROR_INVALID_DATA, + _("Certificate file is empty")); + goto out; + } + + /* Check for PKCS#12 */ + if (nm_crypto_is_pkcs12_data (contents.bin, contents.len, NULL)) { + NM_SET_OUT (out_file_format, NM_CRYPTO_FILE_FORMAT_PKCS12); + NM_SET_OUT (out_certificate, nm_secret_copy_to_gbytes (contents.bin, contents.len)); + return TRUE; + } + + /* Check for plain DER format */ + if (contents.len > 2 && contents.bin[0] == 0x30 && contents.bin[1] == 0x82) { + if (_nm_crypto_verify_x509 (contents.bin, contents.len, NULL)) { + NM_SET_OUT (out_file_format, NM_CRYPTO_FILE_FORMAT_X509); + NM_SET_OUT (out_certificate, nm_secret_copy_to_gbytes (contents.bin, contents.len)); + return TRUE; + } + } else { + nm_auto_clear_secret_ptr NMSecretPtr pem_cert = { 0 }; + + if (extract_pem_cert_data (contents.bin, contents.len, &pem_cert, NULL)) { + if (_nm_crypto_verify_x509 (pem_cert.bin, pem_cert.len, NULL)) { + NM_SET_OUT (out_file_format, NM_CRYPTO_FILE_FORMAT_X509); + NM_SET_OUT (out_certificate, nm_secret_copy_to_gbytes (contents.bin, contents.len)); + return TRUE; + } + } + } + + g_set_error (error, + NM_CRYPTO_ERROR, + NM_CRYPTO_ERROR_INVALID_DATA, + _("Failed to recognize certificate")); + +out: + NM_SET_OUT (out_file_format, NM_CRYPTO_FILE_FORMAT_UNKNOWN); + NM_SET_OUT (out_certificate, NULL); + return FALSE; +} + +gboolean +nm_crypto_is_pkcs12_data (const guint8 *data, + gsize data_len, + GError **error) +{ + GError *local = NULL; + gboolean success; + + if (!data_len) { + g_set_error (error, + NM_CRYPTO_ERROR, + NM_CRYPTO_ERROR_INVALID_DATA, + _("Certificate file is empty")); + return FALSE; + } + + g_return_val_if_fail (data != NULL, FALSE); + + if (!_nm_crypto_init (error)) + return FALSE; + + success = _nm_crypto_verify_pkcs12 (data, data_len, NULL, &local); + if (success == FALSE) { + /* If the error was just a decryption error, then it's pkcs#12 */ + if (local) { + if (g_error_matches (local, NM_CRYPTO_ERROR, NM_CRYPTO_ERROR_DECRYPTION_FAILED)) { + success = TRUE; + g_error_free (local); + } else + g_propagate_error (error, local); + } + } + return success; +} + +gboolean +nm_crypto_is_pkcs12_file (const char *file, GError **error) +{ + nm_auto_clear_secret_ptr NMSecretPtr contents = { 0 }; + + g_return_val_if_fail (file != NULL, FALSE); + + if (!_nm_crypto_init (error)) + return FALSE; + + if (!file_read_contents (file, &contents, error)) + return FALSE; + + return nm_crypto_is_pkcs12_data (contents.bin, contents.len, error); +} + +/* Verifies that a private key can be read, and if a password is given, that + * the private key can be decrypted with that password. + */ +NMCryptoFileFormat +nm_crypto_verify_private_key_data (const guint8 *data, + gsize data_len, + const char *password, + gboolean *out_is_encrypted, + GError **error) +{ + NMCryptoFileFormat format = NM_CRYPTO_FILE_FORMAT_UNKNOWN; + gboolean is_encrypted = FALSE; + + g_return_val_if_fail (data != NULL, NM_CRYPTO_FILE_FORMAT_UNKNOWN); + g_return_val_if_fail (out_is_encrypted == NULL || *out_is_encrypted == FALSE, NM_CRYPTO_FILE_FORMAT_UNKNOWN); + + if (!_nm_crypto_init (error)) + return NM_CRYPTO_FILE_FORMAT_UNKNOWN; + + /* Check for PKCS#12 first */ + if (nm_crypto_is_pkcs12_data (data, data_len, NULL)) { + is_encrypted = TRUE; + if ( !password + || _nm_crypto_verify_pkcs12 (data, data_len, password, error)) + format = NM_CRYPTO_FILE_FORMAT_PKCS12; + } else { + nm_auto_clear_secret_ptr NMSecretPtr parsed = { 0 }; + + /* Maybe it's PKCS#8 */ + if (parse_pkcs8_key_file (data, data_len, &parsed, &is_encrypted, NULL)) { + if ( !password + || _nm_crypto_verify_pkcs8 (parsed.bin, parsed.len, is_encrypted, password, error)) + format = NM_CRYPTO_FILE_FORMAT_RAW_KEY; + } else { + NMCryptoCipherType cipher; + nm_auto_free_secret char *iv = NULL; + + /* Or it's old-style OpenSSL */ + if (parse_old_openssl_key_file (data, data_len, NULL, NULL, &cipher, &iv, NULL)) { + format = NM_CRYPTO_FILE_FORMAT_RAW_KEY; + is_encrypted = (cipher != NM_CRYPTO_CIPHER_UNKNOWN && iv); + } + } + } + + if ( format == NM_CRYPTO_FILE_FORMAT_UNKNOWN + && error + && !*error) { + g_set_error (error, + NM_CRYPTO_ERROR, + NM_CRYPTO_ERROR_INVALID_DATA, + _("not a valid private key")); + } + + if (out_is_encrypted) + *out_is_encrypted = is_encrypted; + return format; +} + +NMCryptoFileFormat +nm_crypto_verify_private_key (const char *filename, + const char *password, + gboolean *out_is_encrypted, + GError **error) +{ + nm_auto_clear_secret_ptr NMSecretPtr contents = { 0 }; + + g_return_val_if_fail (filename != NULL, NM_CRYPTO_FILE_FORMAT_UNKNOWN); + + if (!_nm_crypto_init (error)) + return NM_CRYPTO_FILE_FORMAT_UNKNOWN; + + if (!file_read_contents (filename, &contents, error)) + return NM_CRYPTO_FILE_FORMAT_UNKNOWN; + + return nm_crypto_verify_private_key_data (contents.bin, contents.len, password, out_is_encrypted, error); +} + +void +nm_crypto_md5_hash (const guint8 *salt, + gsize salt_len, + const guint8 *password, + gsize password_len, + guint8 *buffer, + gsize buflen) +{ + nm_auto_free_checksum GChecksum *ctx = NULL; +#define MD5_DIGEST_LEN 16 + nm_auto_clear_static_secret_ptr const NMSecretPtr digest = NM_SECRET_PTR_STATIC (MD5_DIGEST_LEN); + gsize bufidx = 0; + int i; + + nm_assert (g_checksum_type_get_length (G_CHECKSUM_MD5) == MD5_DIGEST_LEN); + + g_return_if_fail (password_len == 0 || password); + g_return_if_fail (buffer); + g_return_if_fail (buflen > 0); + g_return_if_fail (salt_len == 0 || salt); + + ctx = g_checksum_new (G_CHECKSUM_MD5); + + for (;;) { + gsize digest_len; + + if (password_len > 0) + g_checksum_update (ctx, (const guchar *) password, password_len); + if (salt_len > 0) + g_checksum_update (ctx, (const guchar *) salt, salt_len); + + digest_len = MD5_DIGEST_LEN; + g_checksum_get_digest (ctx, digest.bin, &digest_len); + nm_assert (digest_len == MD5_DIGEST_LEN); + + for (i = 0; i < MD5_DIGEST_LEN; i++) { + if (bufidx >= buflen) + return; + buffer[bufidx++] = digest.bin[i]; + } + + g_checksum_reset (ctx); + g_checksum_update (ctx, digest.ptr, MD5_DIGEST_LEN); + } +} + +gboolean +nm_crypto_randomize (void *buffer, gsize buffer_len, GError **error) +{ + return _nm_crypto_randomize (buffer, buffer_len, error); +} + + +/** + * nmtst_crypto_rsa_key_encrypt: + * @data: (array length=len): RSA private key data to be encrypted + * @len: length of @data + * @in_password: (allow-none): existing password to use, if any + * @out_password: (out) (allow-none): if @in_password was %NULL, a random + * password will be generated and returned in this argument + * @error: detailed error information on return, if an error occurred + * + * Encrypts the given RSA private key data with the given password (or generates + * a password if no password was given) and converts the data to PEM format + * suitable for writing to a file. It uses Triple DES cipher for the encryption. + * + * Returns: (transfer full): on success, PEM-formatted data suitable for writing + * to a PEM-formatted certificate/private key file. + **/ +GBytes * +nmtst_crypto_rsa_key_encrypt (const guint8 *data, + gsize len, + const char *in_password, + char **out_password, + GError **error) +{ + guint8 salt[8]; + nm_auto_clear_secret_ptr NMSecretPtr key = { 0 }; + nm_auto_clear_secret_ptr NMSecretPtr enc = { 0 }; + gs_unref_ptrarray GPtrArray *pem = NULL; + nm_auto_free_secret char *tmp_password = NULL; + nm_auto_free_secret char *enc_base64 = NULL; + gsize enc_base64_len; + const char *p; + gsize ret_len, ret_idx; + guint i; + NMSecretBuf *ret; + + g_return_val_if_fail (data, NULL); + g_return_val_if_fail (len > 0, NULL); + g_return_val_if_fail (!out_password || !*out_password, NULL); + + /* Make the password if needed */ + if (!in_password) { + nm_auto_clear_static_secret_ptr NMSecretPtr pw_buf = NM_SECRET_PTR_STATIC (32); + + if (!nm_crypto_randomize (pw_buf.bin, pw_buf.len, error)) + return NULL; + tmp_password = nm_utils_bin2hexstr (pw_buf.bin, pw_buf.len, -1); + in_password = tmp_password; + } + + if (!nm_crypto_randomize (salt, sizeof (salt), error)) + return NULL; + + key.bin = nmtst_crypto_make_des_aes_key (NM_CRYPTO_CIPHER_DES_EDE3_CBC, salt, sizeof (salt), in_password, &key.len, NULL); + if (!key.bin) + g_return_val_if_reached (NULL); + + enc.bin = _nmtst_crypto_encrypt (NM_CRYPTO_CIPHER_DES_EDE3_CBC, data, len, salt, sizeof (salt), key.bin, key.len, &enc.len, error); + if (!enc.bin) + return NULL; + + /* What follows is not the most efficient way to construct the pem + * file line-by-line. At least, it makes sure, that the data will be cleared + * again and not left around in memory. + * + * If this would not be test code, we should improve the implementation + * to avoid some of the copying. */ + pem = g_ptr_array_new_with_free_func ((GDestroyNotify) nm_free_secret); + + g_ptr_array_add (pem, g_strdup ("-----BEGIN RSA PRIVATE KEY-----\n")); + g_ptr_array_add (pem, g_strdup ("Proc-Type: 4,ENCRYPTED\n")); + + /* Convert the salt to a hex string */ + g_ptr_array_add (pem, g_strdup_printf ("DEK-Info: %s,", + nm_crypto_cipher_get_info (NM_CRYPTO_CIPHER_DES_EDE3_CBC)->name)); + g_ptr_array_add (pem, nm_utils_bin2hexstr (salt, sizeof (salt), sizeof (salt) * 2)); + g_ptr_array_add (pem, g_strdup ("\n\n")); + + /* Convert the encrypted key to a base64 string */ + enc_base64 = g_base64_encode ((const guchar *) enc.bin, enc.len); + enc_base64_len = strlen (enc_base64); + for (p = enc_base64; (p - enc_base64) < (ptrdiff_t) enc_base64_len; p += 64) { + g_ptr_array_add (pem, g_strndup (p, 64)); + g_ptr_array_add (pem, g_strdup ("\n")); + } + + g_ptr_array_add (pem, g_strdup ("-----END RSA PRIVATE KEY-----\n")); + + ret_len = 0; + for (i = 0; i < pem->len; i++) + ret_len += strlen (pem->pdata[i]); + + ret = nm_secret_buf_new (ret_len + 1); + ret_idx = 0; + for (i = 0; i < pem->len; i++) { + const char *line = pem->pdata[i]; + gsize line_l = strlen (line); + + memcpy (&ret->bin[ret_idx], line, line_l); + ret_idx += line_l; + nm_assert (ret_idx <= ret_len); + } + nm_assert (ret_idx == ret_len); + ret->bin[ret_len] = '\0'; + + NM_SET_OUT (out_password, g_strdup (tmp_password)); + return nm_secret_buf_to_gbytes_take (ret, ret_len); +} |