diff options
Diffstat (limited to 'src/libnm-core-impl/nm-crypto-nss.c')
| -rw-r--r-- | src/libnm-core-impl/nm-crypto-nss.c | 548 |
1 files changed, 548 insertions, 0 deletions
diff --git a/src/libnm-core-impl/nm-crypto-nss.c b/src/libnm-core-impl/nm-crypto-nss.c new file mode 100644 index 00000000..e59a11b9 --- /dev/null +++ b/src/libnm-core-impl/nm-crypto-nss.c @@ -0,0 +1,548 @@ +/* SPDX-License-Identifier: LGPL-2.1-or-later */ +/* + * Dan Williams <dcbw@redhat.com> + * Copyright (C) 2007 - 2009 Red Hat, Inc. + */ + +#include "libnm-glib-aux/nm-default-glib-i18n-lib.h" + +#include "nm-crypto-impl.h" + +NM_PRAGMA_WARNING_DISABLE("-Wstrict-prototypes") +#include <prinit.h> +#include <nss.h> +#include <pk11pub.h> +#include <pkcs11t.h> +#include <cert.h> +#include <prerror.h> +#include <p12.h> +#include <ciferfam.h> +#include <p12plcy.h> +NM_PRAGMA_WARNING_REENABLE + +#include "libnm-glib-aux/nm-secret-utils.h" +#include "nm-errors.h" + +/*****************************************************************************/ + +static gboolean +_get_cipher_info(NMCryptoCipherType cipher, + CK_MECHANISM_TYPE *out_cipher_mech, + guint8 * out_real_iv_len) +{ + static const CK_MECHANISM_TYPE cipher_mechs[] = { + [NM_CRYPTO_CIPHER_DES_EDE3_CBC] = CKM_DES3_CBC_PAD, + [NM_CRYPTO_CIPHER_DES_CBC] = CKM_DES_CBC_PAD, + [NM_CRYPTO_CIPHER_AES_128_CBC] = CKM_AES_CBC_PAD, + [NM_CRYPTO_CIPHER_AES_192_CBC] = CKM_AES_CBC_PAD, + [NM_CRYPTO_CIPHER_AES_256_CBC] = CKM_AES_CBC_PAD, + }; + + g_return_val_if_fail(_NM_INT_NOT_NEGATIVE(cipher) + && (gsize) cipher < G_N_ELEMENTS(cipher_mechs), + FALSE); + + if (!cipher_mechs[cipher]) + return FALSE; + + NM_SET_OUT(out_cipher_mech, cipher_mechs[cipher]); + NM_SET_OUT(out_real_iv_len, nm_crypto_cipher_get_info(cipher)->real_iv_len); + return TRUE; +} + +/*****************************************************************************/ + +gboolean +_nm_crypto_init(GError **error) +{ + static gboolean initialized = FALSE; + SECStatus ret; + + if (initialized) + return TRUE; + + PR_Init(PR_USER_THREAD, PR_PRIORITY_NORMAL, 1); + ret = NSS_NoDB_Init(NULL); + if (ret != SECSuccess) { + g_set_error(error, + NM_CRYPTO_ERROR, + NM_CRYPTO_ERROR_FAILED, + _("Failed to initialize the crypto engine: %d."), + PR_GetError()); + PR_Cleanup(); + return FALSE; + } + + SEC_PKCS12EnableCipher(PKCS12_RC4_40, 1); + SEC_PKCS12EnableCipher(PKCS12_RC4_128, 1); + SEC_PKCS12EnableCipher(PKCS12_RC2_CBC_40, 1); + SEC_PKCS12EnableCipher(PKCS12_RC2_CBC_128, 1); + SEC_PKCS12EnableCipher(PKCS12_DES_56, 1); + SEC_PKCS12EnableCipher(PKCS12_DES_EDE3_168, 1); + SEC_PKCS12SetPreferredCipher(PKCS12_DES_EDE3_168, 1); + + initialized = TRUE; + return TRUE; +} + +guint8 * +_nmtst_crypto_decrypt(NMCryptoCipherType cipher, + const guint8 * data, + gsize data_len, + const guint8 * iv, + gsize iv_len, + const guint8 * key, + gsize key_len, + gsize * out_len, + GError ** error) +{ + CK_MECHANISM_TYPE cipher_mech; + PK11SlotInfo * slot = NULL; + SECItem key_item; + PK11SymKey * sym_key = NULL; + SECItem * sec_param = NULL; + PK11Context * ctx = NULL; + nm_auto_clear_secret_ptr NMSecretPtr output = {0}; + SECStatus s; + gboolean success = FALSE; + int decrypted_len = 0; + unsigned extra = 0; + unsigned pad_len = 0; + guint32 i; + guint8 real_iv_len; + + if (!_get_cipher_info(cipher, &cipher_mech, &real_iv_len)) { + g_set_error(error, + NM_CRYPTO_ERROR, + NM_CRYPTO_ERROR_UNKNOWN_CIPHER, + _("Unsupported key cipher for decryption")); + return NULL; + } + + if (iv_len < real_iv_len) { + g_set_error(error, + NM_CRYPTO_ERROR, + NM_CRYPTO_ERROR_INVALID_DATA, + _("Invalid IV length (must be at least %u)."), + (guint) real_iv_len); + return NULL; + } + + if (!_nm_crypto_init(error)) + return NULL; + + slot = PK11_GetBestSlot(cipher_mech, NULL); + if (!slot) { + g_set_error(error, + NM_CRYPTO_ERROR, + NM_CRYPTO_ERROR_FAILED, + _("Failed to initialize the decryption cipher slot.")); + goto out; + } + + key_item.data = (unsigned char *) key; + key_item.len = key_len; + sym_key = PK11_ImportSymKey(slot, cipher_mech, PK11_OriginUnwrap, CKA_DECRYPT, &key_item, NULL); + if (!sym_key) { + g_set_error(error, + NM_CRYPTO_ERROR, + NM_CRYPTO_ERROR_DECRYPTION_FAILED, + _("Failed to set symmetric key for decryption.")); + goto out; + } + + key_item.data = (unsigned char *) iv; + key_item.len = real_iv_len; + sec_param = PK11_ParamFromIV(cipher_mech, &key_item); + if (!sec_param) { + g_set_error(error, + NM_CRYPTO_ERROR, + NM_CRYPTO_ERROR_DECRYPTION_FAILED, + _("Failed to set IV for decryption.")); + goto out; + } + + ctx = PK11_CreateContextBySymKey(cipher_mech, CKA_DECRYPT, sym_key, sec_param); + if (!ctx) { + g_set_error(error, + NM_CRYPTO_ERROR, + NM_CRYPTO_ERROR_DECRYPTION_FAILED, + _("Failed to initialize the decryption context.")); + goto out; + } + + output.len = data_len; + output.bin = g_malloc(data_len); + + s = PK11_CipherOp(ctx, + (unsigned char *) output.bin, + &decrypted_len, + output.len, + data, + data_len); + if (s != SECSuccess) { + g_set_error(error, + NM_CRYPTO_ERROR, + NM_CRYPTO_ERROR_DECRYPTION_FAILED, + _("Failed to decrypt the private key: %d."), + PORT_GetError()); + goto out; + } + + if (decrypted_len > data_len) { + g_set_error(error, + NM_CRYPTO_ERROR, + NM_CRYPTO_ERROR_DECRYPTION_FAILED, + _("Failed to decrypt the private key: decrypted data too large.")); + goto out; + } + + s = PK11_DigestFinal(ctx, + (unsigned char *) &output.bin[decrypted_len], + &extra, + data_len - decrypted_len); + if (s != SECSuccess) { + g_set_error(error, + NM_CRYPTO_ERROR, + NM_CRYPTO_ERROR_DECRYPTION_FAILED, + _("Failed to finalize decryption of the private key: %d."), + PORT_GetError()); + goto out; + } + + decrypted_len += extra; + pad_len = data_len - decrypted_len; + + /* Check if the padding at the end of the decrypted data is valid */ + if (pad_len == 0 || pad_len > real_iv_len) { + g_set_error(error, + NM_CRYPTO_ERROR, + NM_CRYPTO_ERROR_DECRYPTION_FAILED, + _("Failed to decrypt the private key: unexpected padding length.")); + goto out; + } + + /* Validate tail padding; last byte is the padding size, and all pad bytes + * should contain the padding size. + */ + for (i = pad_len; i > 0; i--) { + if (output.bin[data_len - i] != pad_len) { + g_set_error(error, + NM_CRYPTO_ERROR, + NM_CRYPTO_ERROR_DECRYPTION_FAILED, + _("Failed to decrypt the private key.")); + goto out; + } + } + + success = TRUE; + +out: + if (ctx) + PK11_DestroyContext(ctx, PR_TRUE); + if (sym_key) + PK11_FreeSymKey(sym_key); + if (sec_param) + SECITEM_FreeItem(sec_param, PR_TRUE); + if (slot) + PK11_FreeSlot(slot); + + if (!success) + return NULL; + + if (decrypted_len < output.len) + nm_explicit_bzero(&output.bin[decrypted_len], output.len - decrypted_len); + *out_len = decrypted_len; + return g_steal_pointer(&output.bin); +} + +guint8 * +_nmtst_crypto_encrypt(NMCryptoCipherType cipher, + const guint8 * data, + gsize data_len, + const guint8 * iv, + gsize iv_len, + const guint8 * key, + gsize key_len, + gsize * out_len, + GError ** error) +{ + SECStatus ret; + CK_MECHANISM_TYPE cipher_mech = CKM_DES3_CBC_PAD; + PK11SlotInfo * slot = NULL; + SECItem key_item = {.data = (unsigned char *) key, .len = key_len}; + SECItem iv_item = {.data = (unsigned char *) iv, .len = iv_len}; + PK11SymKey * sym_key = NULL; + SECItem * sec_param = NULL; + PK11Context * ctx = NULL; + nm_auto_clear_secret_ptr NMSecretPtr padded_buf = {0}; + nm_auto_clear_secret_ptr NMSecretPtr output = {0}; + int encrypted_len = 0, i; + gboolean success = FALSE; + gsize pad_len; + + if (cipher == NM_CRYPTO_CIPHER_DES_CBC || !_get_cipher_info(cipher, &cipher_mech, NULL)) { + g_set_error(error, + NM_CRYPTO_ERROR, + NM_CRYPTO_ERROR_UNKNOWN_CIPHER, + _("Unsupported key cipher for encryption")); + return NULL; + } + + if (!_nm_crypto_init(error)) + return NULL; + + slot = PK11_GetBestSlot(cipher_mech, NULL); + if (!slot) { + g_set_error(error, + NM_CRYPTO_ERROR, + NM_CRYPTO_ERROR_FAILED, + _("Failed to initialize the encryption cipher slot.")); + return NULL; + } + + sym_key = PK11_ImportSymKey(slot, cipher_mech, PK11_OriginUnwrap, CKA_ENCRYPT, &key_item, NULL); + if (!sym_key) { + g_set_error(error, + NM_CRYPTO_ERROR, + NM_CRYPTO_ERROR_ENCRYPTION_FAILED, + _("Failed to set symmetric key for encryption.")); + goto out; + } + + sec_param = PK11_ParamFromIV(cipher_mech, &iv_item); + if (!sec_param) { + g_set_error(error, + NM_CRYPTO_ERROR, + NM_CRYPTO_ERROR_ENCRYPTION_FAILED, + _("Failed to set IV for encryption.")); + goto out; + } + + ctx = PK11_CreateContextBySymKey(cipher_mech, CKA_ENCRYPT, sym_key, sec_param); + if (!ctx) { + g_set_error(error, + NM_CRYPTO_ERROR, + NM_CRYPTO_ERROR_ENCRYPTION_FAILED, + _("Failed to initialize the encryption context.")); + goto out; + } + + /* If data->len % ivlen == 0, then we add another complete block + * onto the end so that the decrypter knows there's padding. + */ + pad_len = iv_len - (data_len % iv_len); + + padded_buf.len = data_len + pad_len; + padded_buf.bin = g_malloc(padded_buf.len); + + memcpy(padded_buf.bin, data, data_len); + for (i = 0; i < pad_len; i++) + padded_buf.bin[data_len + i] = (guint8) (pad_len & 0xFF); + + output.len = padded_buf.len; + output.bin = g_malloc(output.len); + + ret = + PK11_CipherOp(ctx, output.bin, &encrypted_len, output.len, padded_buf.bin, padded_buf.len); + if (ret != SECSuccess) { + g_set_error(error, + NM_CRYPTO_ERROR, + NM_CRYPTO_ERROR_ENCRYPTION_FAILED, + _("Failed to encrypt: %d."), + PORT_GetError()); + goto out; + } + + if (encrypted_len != output.len) { + g_set_error(error, + NM_CRYPTO_ERROR, + NM_CRYPTO_ERROR_ENCRYPTION_FAILED, + _("Unexpected amount of data after encrypting.")); + goto out; + } + + success = TRUE; + +out: + if (ctx) + PK11_DestroyContext(ctx, PR_TRUE); + if (sec_param) + SECITEM_FreeItem(sec_param, PR_TRUE); + if (sym_key) + PK11_FreeSymKey(sym_key); + if (slot) + PK11_FreeSlot(slot); + + if (!success) + return NULL; + + *out_len = output.len; + return g_steal_pointer(&output.bin); +} + +gboolean +_nm_crypto_verify_x509(const guint8 *data, gsize len, GError **error) +{ + CERTCertificate *cert; + + if (!_nm_crypto_init(error)) + return FALSE; + + /* Try DER/PEM first */ + cert = CERT_DecodeCertFromPackage((char *) data, len); + if (!cert) { + g_set_error(error, + NM_CRYPTO_ERROR, + NM_CRYPTO_ERROR_INVALID_DATA, + _("Couldn't decode certificate: %d"), + PORT_GetError()); + return FALSE; + } + + CERT_DestroyCertificate(cert); + return TRUE; +} + +gboolean +_nm_crypto_verify_pkcs12(const guint8 *data, gsize data_len, const char *password, GError **error) +{ + SEC_PKCS12DecoderContext *p12ctx = NULL; + SECItem pw = {0}; + PK11SlotInfo * slot = NULL; + SECStatus s; + gboolean success = FALSE; + + g_return_val_if_fail(!error || !*error, FALSE); + + if (!_nm_crypto_init(error)) + return FALSE; + + /* PKCS#12 passwords are apparently UCS2 BIG ENDIAN, and NSS doesn't do + * any conversions for us. + */ + if (password && *password) { + nm_auto_clear_secret_ptr NMSecretPtr ucs2_password = {0}; + + if (g_utf8_validate(password, -1, NULL)) { + long ucs2_chars; + + ucs2_password.bin = + (guint8 *) g_utf8_to_utf16(password, strlen(password), NULL, &ucs2_chars, NULL); + + /* cannot fail, because password is valid UTF-8*/ + nm_assert(ucs2_password.bin && ucs2_chars > 0); + + ucs2_password.len = ucs2_chars * 2; + } + + if (!ucs2_password.bin || ucs2_password.len == 0) { + g_set_error(error, + NM_CRYPTO_ERROR, + NM_CRYPTO_ERROR_INVALID_PASSWORD, + _("Password must be UTF-8")); + return FALSE; + } + + pw.data = PORT_ZAlloc(ucs2_password.len + 2); + memcpy(pw.data, ucs2_password.bin, ucs2_password.len); + pw.len = ucs2_password.len + 2; + +#if __BYTE_ORDER == __LITTLE_ENDIAN + { + guint16 *p, *p_end; + + p_end = (guint16 *) &(((guint8 *) pw.data)[ucs2_password.len]); + for (p = (guint16 *) pw.data; p < p_end; p++) + *p = GUINT16_SWAP_LE_BE(*p); + } +#endif + } + + slot = PK11_GetInternalKeySlot(); + if (!slot) { + g_set_error(error, NM_CRYPTO_ERROR, NM_CRYPTO_ERROR_FAILED, _("Couldn't initialize slot")); + goto out; + } + + p12ctx = SEC_PKCS12DecoderStart(&pw, slot, NULL, NULL, NULL, NULL, NULL, NULL); + if (!p12ctx) { + g_set_error(error, + NM_CRYPTO_ERROR, + NM_CRYPTO_ERROR_FAILED, + _("Couldn't initialize PKCS#12 decoder: %d"), + PORT_GetError()); + goto out; + } + + s = SEC_PKCS12DecoderUpdate(p12ctx, (guint8 *) data, data_len); + if (s != SECSuccess) { + g_set_error(error, + NM_CRYPTO_ERROR, + NM_CRYPTO_ERROR_INVALID_DATA, + _("Couldn't decode PKCS#12 file: %d"), + PORT_GetError()); + goto out; + } + + s = SEC_PKCS12DecoderVerify(p12ctx); + if (s != SECSuccess) { + g_set_error(error, + NM_CRYPTO_ERROR, + NM_CRYPTO_ERROR_DECRYPTION_FAILED, + _("Couldn't verify PKCS#12 file: %d"), + PORT_GetError()); + goto out; + } + + success = TRUE; + +out: + if (p12ctx) + SEC_PKCS12DecoderFinish(p12ctx); + if (slot) + PK11_FreeSlot(slot); + + if (pw.data) + SECITEM_ZfreeItem(&pw, PR_FALSE); + + return success; +} + +gboolean +_nm_crypto_verify_pkcs8(const guint8 *data, + gsize data_len, + gboolean is_encrypted, + const char * password, + GError ** error) +{ + g_return_val_if_fail(data != NULL, FALSE); + + if (!_nm_crypto_init(error)) + return FALSE; + + /* NSS apparently doesn't do PKCS#8 natively, but you have to put the + * PKCS#8 key into a PKCS#12 file and import that?? So until we figure + * all that out, we can only assume the password is valid. + */ + return TRUE; +} + +gboolean +_nm_crypto_randomize(void *buffer, gsize buffer_len, GError **error) +{ + SECStatus s; + + if (!_nm_crypto_init(error)) + return FALSE; + + s = PK11_GenerateRandom(buffer, buffer_len); + if (s != SECSuccess) { + g_set_error_literal(error, + NM_CRYPTO_ERROR, + NM_CRYPTO_ERROR_FAILED, + _("Could not generate random data.")); + return FALSE; + } + return TRUE; +} |