/* SPDX-License-Identifier: LGPL-2.1+ */ /* * Dan Williams * Copyright (C) 2007 - 2018 Red Hat, Inc. */ #include "nm-default.h" #include "nm-crypto.h" #include #include #include #include "nm-glib-aux/nm-secret-utils.h" #include "nm-glib-aux/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-----" #define PEM_TPM2_WRAPPED_KEY_BEGIN "-----BEGIN TSS2 PRIVATE KEY-----" #define PEM_TPM2_WRAPPED_KEY_END "-----END TSS2 PRIVATE KEY-----" #define PEM_TPM2_OLD_WRAPPED_KEY_BEGIN "-----BEGIN TSS2 KEY BLOB-----" #define PEM_TPM2_OLD_WRAPPED_KEY_END "-----END TSS2 KEY BLOB-----" /*****************************************************************************/ 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) { const guint8 *p; gsize taglen; nm_assert(out_pos); nm_assert(start_at <= data_len); taglen = strlen(tag); p = memmem(&data[start_at], data_len - start_at, tag, taglen); if (!p) return FALSE; *out_pos = p - data; nm_assert(memcmp(&data[*out_pos], tag, taglen) == 0); return TRUE; } #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 parse_tpm2_wrapped_key_file(const guint8 *data, gsize data_len, gboolean * out_encrypted, GError ** error) { gsize start = 0, end = 0; const char *start_tag = NULL, *end_tag = NULL; nm_assert(out_encrypted); if (find_tag(PEM_TPM2_WRAPPED_KEY_BEGIN, data, data_len, 0, &start)) { start_tag = PEM_TPM2_WRAPPED_KEY_BEGIN; end_tag = PEM_TPM2_WRAPPED_KEY_END; } else if (find_tag(PEM_TPM2_OLD_WRAPPED_KEY_BEGIN, data, data_len, 0, &start)) { start_tag = PEM_TPM2_OLD_WRAPPED_KEY_BEGIN; end_tag = PEM_TPM2_OLD_WRAPPED_KEY_END; } else { g_set_error_literal(error, NM_CRYPTO_ERROR, NM_CRYPTO_ERROR_INVALID_DATA, _("Failed to find expected TSS 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 TSS end tag '%s'."), end_tag); return FALSE; } *out_encrypted = FALSE; 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, NULL, error); } 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 if (parse_tpm2_wrapped_key_file(data, data_len, &is_encrypted, NULL)) { 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; nm_auto_clear_static_secret_ptr const NMSecretPtr digest = NM_SECRET_PTR_STATIC(NM_UTILS_CHECKSUM_LENGTH_MD5); gsize bufidx = 0; int i; 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 (;;) { 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); nm_utils_checksum_get_digest_len(ctx, digest.bin, NM_UTILS_CHECKSUM_LENGTH_MD5); for (i = 0; i < NM_UTILS_CHECKSUM_LENGTH_MD5; i++) { if (bufidx >= buflen) return; buffer[bufidx++] = digest.bin[i]; } g_checksum_reset(ctx); g_checksum_update(ctx, digest.ptr, NM_UTILS_CHECKSUM_LENGTH_MD5); } } 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); }