diff options
Diffstat (limited to 'libnm-core/crypto_nss.c')
| -rw-r--r-- | libnm-core/crypto_nss.c | 528 |
1 files changed, 528 insertions, 0 deletions
diff --git a/libnm-core/crypto_nss.c b/libnm-core/crypto_nss.c new file mode 100644 index 00000000..9a0c4334 --- /dev/null +++ b/libnm-core/crypto_nss.c @@ -0,0 +1,528 @@ +/* -*- 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 - 2009 Red Hat, Inc. + */ + +#include "nm-default.h" + +#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> + +#include "crypto.h" +#include "nm-errors.h" + +static gboolean initialized = FALSE; + +gboolean +crypto_init (GError **error) +{ + 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; +} + +char * +crypto_decrypt (const char *cipher, + int key_type, + const guint8 *data, + gsize data_len, + const char *iv, + const gsize iv_len, + const char *key, + const gsize key_len, + gsize *out_len, + GError **error) +{ + char *output = NULL; + int decrypted_len = 0; + CK_MECHANISM_TYPE cipher_mech; + PK11SlotInfo *slot = NULL; + SECItem key_item; + PK11SymKey *sym_key = NULL; + SECItem *sec_param = NULL; + PK11Context *ctx = NULL; + SECStatus s; + gboolean success = FALSE; + unsigned pad_len = 0, extra = 0; + guint32 i, real_iv_len = 0; + + if (!crypto_init (error)) + return NULL; + + if (!strcmp (cipher, CIPHER_DES_EDE3_CBC)) { + cipher_mech = CKM_DES3_CBC_PAD; + real_iv_len = 8; + } else if (!strcmp (cipher, CIPHER_DES_CBC)) { + cipher_mech = CKM_DES_CBC_PAD; + real_iv_len = 8; + } else if (NM_IN_STRSET (cipher, CIPHER_AES_128_CBC, + CIPHER_AES_192_CBC, + CIPHER_AES_256_CBC)) { + cipher_mech = CKM_AES_CBC_PAD; + real_iv_len = 16; + } else { + g_set_error (error, NM_CRYPTO_ERROR, + NM_CRYPTO_ERROR_UNKNOWN_CIPHER, + _("Private key cipher '%s' was unknown."), + cipher); + 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 %d)."), + real_iv_len); + return NULL; + } + + output = g_malloc0 (data_len); + + 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; + } + + s = PK11_CipherOp (ctx, + (unsigned char *) output, + &decrypted_len, + data_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 + 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[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; + } + } + + *out_len = decrypted_len; + 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) { + if (output) { + /* Don't expose key material */ + memset (output, 0, data_len); + g_free (output); + output = NULL; + } + } + return output; +} + +char * +crypto_encrypt (const char *cipher, + const guint8 *data, + gsize data_len, + const char *iv, + gsize iv_len, + const char *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; + unsigned char *output, *padded_buf; + gsize output_len; + int encrypted_len = 0, i; + gboolean success = FALSE; + gsize padded_buf_len, pad_len; + + if (!crypto_init (error)) + return NULL; + + if (!strcmp (cipher, CIPHER_DES_EDE3_CBC)) + cipher_mech = CKM_DES3_CBC_PAD; + else if (NM_IN_STRSET (cipher, + CIPHER_AES_128_CBC, + CIPHER_AES_192_CBC, + CIPHER_AES_256_CBC)) + cipher_mech = CKM_AES_CBC_PAD; + else { + g_set_error (error, NM_CRYPTO_ERROR, + NM_CRYPTO_ERROR_UNKNOWN_CIPHER, + _("Private key cipher '%s' was unknown."), + cipher); + return NULL; + } + + /* 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); + output_len = padded_buf_len = data_len + pad_len; + padded_buf = g_malloc0 (padded_buf_len); + + memcpy (padded_buf, data, data_len); + for (i = 0; i < pad_len; i++) + padded_buf[data_len + i] = (guint8) (pad_len & 0xFF); + + output = g_malloc0 (output_len); + + 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.")); + goto out; + } + + 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; + } + + ret = PK11_CipherOp (ctx, output, &encrypted_len, output_len, padded_buf, 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; + } + + *out_len = encrypted_len; + 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); + + memset (padded_buf, 0, padded_buf_len); + g_free (padded_buf); + + if (!success) { + memset (output, 0, output_len); + g_free (output); + output = NULL; + } + return (char *) output; +} + +NMCryptoFileFormat +crypto_verify_cert (const unsigned char *data, + gsize len, + GError **error) +{ + CERTCertificate *cert; + + if (!crypto_init (error)) + return NM_CRYPTO_FILE_FORMAT_UNKNOWN; + + /* 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 NM_CRYPTO_FILE_FORMAT_UNKNOWN; + } + + CERT_DestroyCertificate (cert); + return NM_CRYPTO_FILE_FORMAT_X509; +} + +gboolean +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; + gunichar2 *ucs2_password; + glong ucs2_chars = 0; +#ifndef WORDS_BIGENDIAN + guint16 *p; +#endif /* WORDS_BIGENDIAN */ + + if (error) + g_return_val_if_fail (*error == NULL, FALSE); + + if (!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) { + if (!g_utf8_validate (password, -1, NULL)) { + g_set_error (error, NM_CRYPTO_ERROR, + NM_CRYPTO_ERROR_INVALID_PASSWORD, + _("Password must be UTF-8")); + return FALSE; + } + ucs2_password = g_utf8_to_utf16 (password, strlen (password), NULL, &ucs2_chars, NULL); + /* Can't fail if g_utf8_validate() succeeded */ + g_return_val_if_fail (ucs2_password != NULL && ucs2_chars != 0, FALSE); + + ucs2_chars *= 2; /* convert # UCS2 characters -> bytes */ + pw.data = PORT_ZAlloc(ucs2_chars + 2); + memcpy (pw.data, ucs2_password, ucs2_chars); + pw.len = ucs2_chars + 2; /* include terminating NULL */ + + memset (ucs2_password, 0, ucs2_chars); + g_free (ucs2_password); + +#ifndef WORDS_BIGENDIAN + for (p = (guint16 *) pw.data; p < (guint16 *) (pw.data + pw.len); p++) + *p = GUINT16_SWAP_LE_BE (*p); +#endif /* WORDS_BIGENDIAN */ + } else { + /* NULL password */ + pw.data = NULL; + pw.len = 0; + } + + slot = PK11_GetInternalKeySlot(); + 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 error; + } + + 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 error; + } + + 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 error; + } + + SEC_PKCS12DecoderFinish (p12ctx); + SECITEM_ZfreeItem (&pw, PR_FALSE); + return TRUE; + +error: + if (p12ctx) + SEC_PKCS12DecoderFinish (p12ctx); + + if (slot) + PK11_FreeSlot(slot); + + SECITEM_ZfreeItem (&pw, PR_FALSE); + return FALSE; +} + +gboolean +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 (!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 +crypto_randomize (void *buffer, gsize buffer_len, GError **error) +{ + SECStatus s; + + if (!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; +} |