Imported Upstream version 0.8.1 upstream/0.8.1

1 files changed, 636 insertions, 0 deletions

diff --git a/libnm-util/crypto.c b/libnm-util/crypto.c
new file mode 100644
index 00000000..813cbc8e
--- /dev/null
+++ b/libnm-util/crypto.c
@@ -0,0 +1,636 @@
+/* -*- 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.
+ *
+ * (C) Copyright 2007 - 2009 Red Hat, Inc.
+ */
+
+#include <glib.h>
+#include <string.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <glib/gi18n.h>
+
+#include "crypto.h"
+
+GQuark
+_nm_crypto_error_quark (void)
+{
+	static GQuark quark;
+
+	if (G_UNLIKELY (!quark))
+		quark = g_quark_from_static_string ("nm-crypto-error-quark");
+	return quark;
+}
+
+
+static const char *pem_rsa_key_begin = "-----BEGIN RSA PRIVATE KEY-----";
+static const char *pem_rsa_key_end = "-----END RSA PRIVATE KEY-----";
+
+static const char *pem_dsa_key_begin = "-----BEGIN DSA PRIVATE KEY-----";
+static const char *pem_dsa_key_end = "-----END DSA PRIVATE KEY-----";
+
+static const char *pem_cert_begin = "-----BEGIN CERTIFICATE-----";
+static const char *pem_cert_end = "-----END CERTIFICATE-----";
+
+static const char *
+find_tag (const char *tag, const char *buf, gsize len)
+{
+	gsize i, taglen;
+
+	taglen = strlen (tag);
+	if (len < taglen)
+		return NULL;
+
+	for (i = 0; i < len - taglen + 1; i++) {
+		if (memcmp (buf + i, tag, taglen) == 0)
+			return buf + i;
+	}
+	return NULL;
+}
+
+#define DEK_INFO_TAG "DEK-Info: "
+#define PROC_TYPE_TAG "Proc-Type: "
+
+static GByteArray *
+parse_old_openssl_key_file (GByteArray *contents,
+                            int key_type,
+                            char **out_cipher,
+                            char **out_iv,
+                            GError **error)
+{
+	GByteArray *bindata = NULL;
+	char **lines = NULL;
+	char **ln = NULL;
+	const char *pos;
+	const char *end;
+	GString *str = NULL;
+	int enc_tags = 0;
+	char *iv = NULL;
+	char *cipher = NULL;
+	unsigned char *tmp = NULL;
+	gsize tmp_len = 0;
+	const char *start_tag;
+	const char *end_tag;
+
+	switch (key_type) {
+	case NM_CRYPTO_KEY_TYPE_RSA:
+		start_tag = pem_rsa_key_begin;
+		end_tag = pem_rsa_key_end;
+		break;
+	case NM_CRYPTO_KEY_TYPE_DSA:
+		start_tag = pem_dsa_key_begin;
+		end_tag = pem_dsa_key_end;
+		break;
+	default:
+		g_set_error (error, NM_CRYPTO_ERROR,
+		             NM_CRYPTO_ERR_UNKNOWN_KEY_TYPE,
+		             "Unknown key type %d",
+		             key_type);
+		g_assert_not_reached ();
+		return NULL;
+	}
+
+	pos = find_tag (start_tag, (const char *) contents->data, contents->len);
+	if (!pos)
+		goto parse_error;
+
+	pos += strlen (start_tag);
+
+	end = find_tag (end_tag, pos, (const char *) contents->data + contents->len - pos);
+	if (end == NULL) {
+		g_set_error (error, NM_CRYPTO_ERROR,
+		             NM_CRYPTO_ERR_FILE_FORMAT_INVALID,
+		             _("PEM key file had no end tag '%s'."),
+		             end_tag);
+		goto parse_error;
+	}
+	*((char *) end) = '\0';
+
+	lines = g_strsplit (pos, "\n", 0);
+	if (!lines || g_strv_length (lines) <= 1) {
+		g_set_error (error, NM_CRYPTO_ERROR,
+		             NM_CRYPTO_ERR_FILE_FORMAT_INVALID,
+		             _("Doesn't look like a PEM private key file."));
+		goto parse_error;
+	}
+
+	str = g_string_new_len (NULL, end - pos);
+	if (!str) {
+		g_set_error (error, NM_CRYPTO_ERROR,
+		             NM_CRYPTO_ERR_OUT_OF_MEMORY,
+		             _("Not enough memory to store PEM file data."));
+		goto parse_error;
+	}
+
+	for (ln = lines; *ln; ln++) {
+		char *p = *ln;
+
+		/* Chug leading spaces */
+		p = g_strstrip (p);
+		if (!*p)
+			continue;
+
+		if (!strncmp (p, PROC_TYPE_TAG, strlen (PROC_TYPE_TAG))) {
+			if (enc_tags++ != 0) {
+				g_set_error (error, NM_CRYPTO_ERROR,
+				             NM_CRYPTO_ERR_FILE_FORMAT_INVALID,
+				             _("Malformed PEM file: Proc-Type was not first tag."));
+				goto parse_error;
+			}
+
+			p += strlen (PROC_TYPE_TAG);
+			if (strcmp (p, "4,ENCRYPTED")) {
+				g_set_error (error, NM_CRYPTO_ERROR,
+				             NM_CRYPTO_ERR_FILE_FORMAT_INVALID,
+				             _("Malformed PEM file: unknown Proc-Type tag '%s'."),
+				             p);
+				goto parse_error;
+			}
+		} else if (!strncmp (p, DEK_INFO_TAG, strlen (DEK_INFO_TAG))) {
+			char *comma;
+
+			if (enc_tags++ != 1) {
+				g_set_error (error, NM_CRYPTO_ERROR,
+				             NM_CRYPTO_ERR_FILE_FORMAT_INVALID,
+				             _("Malformed PEM file: DEK-Info was not the second tag."));
+				goto parse_error;
+			}
+
+			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_ERR_FILE_FORMAT_INVALID,
+				             _("Malformed PEM file: no IV found in DEK-Info tag."));
+				goto parse_error;
+			}
+			*comma++ = '\0';
+			if (!g_ascii_isxdigit (*comma)) {
+				g_set_error (error, NM_CRYPTO_ERROR,
+				             NM_CRYPTO_ERR_FILE_FORMAT_INVALID,
+				             _("Malformed PEM file: invalid format of IV in DEK-Info tag."));
+				goto parse_error;
+			}
+			iv = g_strdup (comma);
+
+			/* Get the private key cipher */
+			if (!strcasecmp (p, "DES-EDE3-CBC")) {
+				cipher = g_strdup (p);
+			} else if (!strcasecmp (p, "DES-CBC")) {
+				cipher = g_strdup (p);
+			} else {
+				g_set_error (error, NM_CRYPTO_ERROR,
+				             NM_CRYPTO_ERR_UNKNOWN_KEY_TYPE,
+				             _("Malformed PEM file: unknown private key cipher '%s'."),
+				             p);
+				goto parse_error;
+			}
+		} else {
+			if ((enc_tags != 0) && (enc_tags != 2)) {
+				g_set_error (error, NM_CRYPTO_ERROR,
+				             NM_CRYPTO_ERR_FILE_FORMAT_INVALID,
+				             "Malformed PEM file: both Proc-Type and DEK-Info tags are required.");
+				goto parse_error;
+			}
+			g_string_append (str, p);
+		}
+	}
+
+	tmp = g_base64_decode (str->str, &tmp_len);
+	if (tmp == NULL || !tmp_len) {
+		g_set_error (error, NM_CRYPTO_ERROR,
+		             NM_CRYPTO_ERR_DECODE_FAILED,
+		             _("Could not decode private key."));
+		goto parse_error;
+	}
+
+	if (lines)
+		g_strfreev (lines);
+
+	bindata = g_byte_array_sized_new (tmp_len);
+	g_byte_array_append (bindata, tmp, tmp_len);
+	*out_iv = iv;
+	*out_cipher = cipher;
+	return bindata;
+
+parse_error:
+	g_free (cipher);
+	g_free (iv);
+	if (lines)
+		g_strfreev (lines);
+	return NULL;
+}
+
+static GByteArray *
+file_to_g_byte_array (const char *filename,
+                      gboolean privkey,
+                      GError **error)
+{
+	char *contents, *der = NULL;
+	GByteArray *array = NULL;
+	gsize length = 0;
+	const char *pos = NULL;
+
+	if (!g_file_get_contents (filename, &contents, &length, error))
+		return NULL;
+
+	if (!privkey)
+		pos = find_tag (pem_cert_begin, contents, length);
+
+	if (pos) {
+		const char *end;
+
+		pos += strlen (pem_cert_begin);
+		end = find_tag (pem_cert_end, pos, contents + length - pos);
+		if (end == NULL) {
+			g_set_error (error, NM_CRYPTO_ERROR,
+			             NM_CRYPTO_ERR_FILE_FORMAT_INVALID,
+			             _("PEM certificate '%s' had no end tag '%s'."),
+			             filename, pem_cert_end);
+			goto done;
+		}
+
+		contents[end - contents - 1] = '\0';
+		der = (char *) g_base64_decode (pos, &length);
+		if (der == NULL || !length) {
+			g_set_error (error, NM_CRYPTO_ERROR,
+			             NM_CRYPTO_ERR_DECODE_FAILED,
+			             _("Failed to decode certificate."));
+			goto done;
+		}
+	}
+
+	array = g_byte_array_sized_new (length);
+	if (!array) {
+		g_set_error (error, NM_CRYPTO_ERROR,
+		             NM_CRYPTO_ERR_OUT_OF_MEMORY,
+		             _("Not enough memory to store certificate data."));
+		goto done;
+	}
+
+	g_byte_array_append (array, der ? (unsigned char *) der : (unsigned char *) contents, length);
+	if (array->len != length) {
+		g_set_error (error, NM_CRYPTO_ERROR,
+		             NM_CRYPTO_ERR_OUT_OF_MEMORY,
+		             _("Not enough memory to store file data."));
+		g_byte_array_free (array, TRUE);
+		array = NULL;
+	}
+
+done:
+	g_free (der);
+	g_free (contents);
+	return array;
+}
+
+/*
+ * Convert a hex string into bytes.
+ */
+static char *
+convert_iv (const char *src,
+            gsize *out_len,
+            GError **error)
+{
+	int num;
+	int i;
+	char conv[3];
+	char *c;
+
+	g_return_val_if_fail (src != NULL, NULL);
+
+	num = strlen (src);
+	if (num % 2) {
+		g_set_error (error, NM_CRYPTO_ERROR,
+		             NM_CRYPTO_ERR_RAW_IV_INVALID,
+		             _("IV must be an even number of bytes in length."));
+		return NULL;
+	}
+
+	num /= 2;
+	c = g_malloc0 (num + 1);
+	if (c == NULL) {
+		g_set_error (error, NM_CRYPTO_ERROR,
+		             NM_CRYPTO_ERR_OUT_OF_MEMORY,
+		             _("Not enough memory to store the IV."));
+        return NULL;
+	}
+
+	conv[2] = '\0';
+	for (i = 0; i < num; i++) {
+        conv[0] = src[(i * 2)];
+        conv[1] = src[(i * 2) + 1];
+		if (!g_ascii_isxdigit (conv[0]) || !g_ascii_isxdigit (conv[1])) {
+			g_set_error (error, NM_CRYPTO_ERROR,
+			             NM_CRYPTO_ERR_RAW_IV_INVALID,
+			             _("IV contains non-hexadecimal digits."));
+			goto error;
+		}
+
+		c[i] = strtol(conv, NULL, 16);
+	}
+	*out_len = num;
+	return c;
+
+error:
+	g_free (c);
+	return NULL;
+}
+
+static char *
+make_des_key (const char *cipher,
+              const char *salt,
+              const gsize salt_len,
+              const char *password,
+              gsize *out_len,
+              GError **error)
+{
+	char *key;
+	guint32 digest_len;
+
+	g_return_val_if_fail (cipher != NULL, NULL);
+	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);
+
+	if (!strcmp (cipher, "DES-EDE3-CBC"))
+		digest_len = 24;
+	else if (!strcmp (cipher, "DES-CBC"))
+		digest_len = 8;
+	else {
+		g_set_error (error, NM_CRYPTO_ERROR,
+		             NM_CRYPTO_ERR_UNKNOWN_CIPHER,
+		             _("Private key cipher '%s' was unknown."),
+		             cipher);
+		return NULL;
+	}
+
+	key = g_malloc0 (digest_len + 1);
+	if (!key) {
+		g_set_error (error, NM_CRYPTO_ERROR,
+		             NM_CRYPTO_ERR_OUT_OF_MEMORY,
+		             _("Not enough memory to decrypt private key."));
+		return NULL;
+	}
+
+	if (!crypto_md5_hash (salt,
+	                      salt_len,
+	                      password,
+	                      strlen (password),
+	                      key,
+	                      digest_len,
+	                      error))
+		goto error;
+
+	*out_len = digest_len;
+	return key;
+
+error:
+	if (key) {
+		/* Don't leak stale key material */
+		memset (key, 0, digest_len);
+		g_free (key);
+	}
+	return NULL;
+}
+
+static char *
+decrypt_key (const char *cipher,
+             int key_type,
+             GByteArray *data,
+             const char *iv,
+             const char *password,
+             gsize *out_len,
+             GError **error)
+{
+	char *bin_iv = NULL;
+	gsize bin_iv_len = 0;
+	char *key = NULL;
+	gsize key_len = 0;
+	char *output = NULL;
+
+	bin_iv = convert_iv (iv, &bin_iv_len, error);
+	if (!bin_iv)
+		return NULL;
+
+	/* Convert the PIN and IV into a DES key */
+	key = make_des_key (cipher, bin_iv, bin_iv_len, password, &key_len, error);
+	if (!key || !key_len)
+		goto out;
+
+	output = crypto_decrypt (cipher, key_type,
+	                         data,
+	                         bin_iv, bin_iv_len,
+	                         key, key_len,
+	                         out_len,
+	                         error);
+	if (!output)
+		goto out;
+
+	if (*out_len == 0) {
+		g_free (output);
+		output = NULL;
+		goto out;
+	}
+ 
+out:
+	if (key) {
+		/* Don't leak stale key material */
+		memset (key, 0, key_len);
+		g_free (key);
+	}
+	g_free (bin_iv);
+	return output;
+}
+
+GByteArray *
+crypto_get_private_key_data (GByteArray *contents,
+                             const char *password,
+                             NMCryptoKeyType *out_key_type,
+                             NMCryptoFileFormat *out_file_type,
+                             GError **error)
+{
+	GByteArray *array = NULL;
+	NMCryptoKeyType key_type = NM_CRYPTO_KEY_TYPE_RSA;
+	GByteArray *data;
+	char *iv = NULL;
+	char *cipher = NULL;
+	char *decrypted = NULL;
+	gsize decrypted_len = 0;
+
+	g_return_val_if_fail (contents != NULL, NULL);
+	g_return_val_if_fail (password != NULL, NULL);
+	g_return_val_if_fail (out_key_type != NULL, NULL);
+	g_return_val_if_fail (*out_key_type == NM_CRYPTO_KEY_TYPE_UNKNOWN, NULL);
+	g_return_val_if_fail (out_file_type != NULL, NULL);
+	g_return_val_if_fail (*out_file_type == NM_CRYPTO_FILE_FORMAT_UNKNOWN, NULL);
+
+	/* Try PKCS#12 first */
+	if (crypto_verify_pkcs12 (contents, password, NULL)) {
+		*out_key_type = NM_CRYPTO_KEY_TYPE_ENCRYPTED;
+		*out_file_type = NM_CRYPTO_FILE_FORMAT_PKCS12;
+
+		array = g_byte_array_sized_new (contents->len);
+		g_byte_array_append (array, contents->data, contents->len);
+		return array;
+	}
+
+	/* OpenSSL non-standard legacy PEM files */
+
+	/* Try RSA keys first */
+	data = parse_old_openssl_key_file (contents, key_type, &cipher, &iv, error);
+	if (!data) {
+		g_clear_error (error);
+
+		/* DSA next */
+		key_type = NM_CRYPTO_KEY_TYPE_DSA;
+		data = parse_old_openssl_key_file (contents, key_type, &cipher, &iv, error);
+		if (!data) {
+			g_clear_error (error);
+			g_set_error (error, NM_CRYPTO_ERROR,
+			             NM_CRYPTO_ERR_FILE_FORMAT_INVALID,
+			             _("Unable to determine private key type."));
+			goto out;
+		}
+	}
+
+	decrypted = decrypt_key (cipher,
+	                         key_type,
+	                         data,
+	                         iv,
+	                         password,
+	                         &decrypted_len,
+	                         error);
+	if (!decrypted)
+		goto out;
+
+	array = g_byte_array_sized_new (decrypted_len);
+	if (!array) {
+		g_set_error (error, NM_CRYPTO_ERROR,
+		             NM_CRYPTO_ERR_OUT_OF_MEMORY,
+		             _("Not enough memory to store decrypted private key."));
+		goto out;
+	}
+
+	g_byte_array_append (array, (const guint8 *) decrypted, decrypted_len);
+	*out_key_type = key_type;
+	*out_file_type = NM_CRYPTO_FILE_FORMAT_RAW_KEY;
+
+out:
+	if (decrypted) {
+		/* Don't expose key material */
+		memset (decrypted, 0, decrypted_len);
+		g_free (decrypted);
+	}
+	if (data)
+		g_byte_array_free (data, TRUE);
+	g_free (cipher);
+	g_free (iv);
+	return array;
+}
+
+GByteArray *
+crypto_get_private_key (const char *file,
+                        const char *password,
+                        NMCryptoKeyType *out_key_type,
+                        NMCryptoFileFormat *out_file_type,
+                        GError **error)
+{
+	GByteArray *contents;
+	GByteArray *key = NULL;
+
+	contents = file_to_g_byte_array (file, TRUE, error);
+	if (contents) {
+		key = crypto_get_private_key_data (contents, password, out_key_type, out_file_type, error);
+		g_byte_array_free (contents, TRUE);
+	}
+	return key;
+}
+
+GByteArray *
+crypto_load_and_verify_certificate (const char *file,
+                                    NMCryptoFileFormat *out_file_format,
+                                    GError **error)
+{
+	GByteArray *array;
+
+	g_return_val_if_fail (file != NULL, NULL);
+	g_return_val_if_fail (out_file_format != NULL, NULL);
+	g_return_val_if_fail (*out_file_format == NM_CRYPTO_FILE_FORMAT_UNKNOWN, NULL);
+
+	array = file_to_g_byte_array (file, FALSE, error);
+	if (!array)
+		return NULL;
+
+	*out_file_format = crypto_verify_cert (array->data, array->len, error);
+	if (*out_file_format == NM_CRYPTO_FILE_FORMAT_UNKNOWN) {
+		/* Try PKCS#12 */
+		if (crypto_is_pkcs12_data (array)) {
+			*out_file_format = NM_CRYPTO_FILE_FORMAT_PKCS12;
+			g_clear_error (error);
+		} else {
+			g_byte_array_free (array, TRUE);
+			array = NULL;
+		}
+	}
+
+	return array;
+}
+
+gboolean
+crypto_is_pkcs12_data (const GByteArray *data)
+{
+	GError *error = NULL;
+	gboolean success;
+
+	g_return_val_if_fail (data != NULL, FALSE);
+
+	success = crypto_verify_pkcs12 (data, NULL, &error);
+	if (success)
+		return TRUE;
+
+	/* If the error was just a decryption error, then it's pkcs#12 */
+	if (error) {
+		if (g_error_matches (error, NM_CRYPTO_ERROR, NM_CRYPTO_ERR_CIPHER_DECRYPT_FAILED))
+			success = TRUE;
+		g_error_free (error);		
+	}
+
+	return success;
+}
+
+gboolean
+crypto_is_pkcs12_file (const char *file, GError **error)
+{
+	GByteArray *contents;
+	gboolean success = FALSE;
+
+	g_return_val_if_fail (file != NULL, FALSE);
+
+	contents = file_to_g_byte_array (file, TRUE, error);
+	if (contents) {
+		success = crypto_is_pkcs12_data (contents);
+		g_byte_array_free (contents, TRUE);
+	}
+	return success;
+}
+