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updated agent plugin to new fingerprint/encoding API

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This commit is contained in:
Martin Willi
2009-08-26 11:23:53 +02:00
parent c5cd195c6c
commit cb4f09eff3
1 changed files with 53 additions and 157 deletions
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src/libstrongswan/plugins/agent/agent_private_key.c
+53 -157
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@@ -1,5 +1,5 @@
/*
* Copyright (C) 2008 Martin Willi
* Copyright (C) 2008-2009 Martin Willi
* Hochschule fuer Technik Rapperswil
*
* This program is free software; you can redistribute it and/or modify it
@@ -26,8 +26,6 @@
#include <library.h>
#include <chunk.h>
#include <debug.h>
#include <asn1/asn1.h>
#include <asn1/oid.h>
#ifndef UNIX_PATH_MAX
#define UNIX_PATH_MAX 108
@@ -60,20 +58,10 @@ struct private_agent_private_key_t {
*/
size_t key_size;
/**
* Keyid formed as a SHA-1 hash of a publicKey object
*/
identification_t* keyid;
/**
* Keyid formed as a SHA-1 hash of a publicKeyInfo object
*/
identification_t* keyid_info;
/**
* reference count
*/
refcount_t ref;
refcount_t ref;
};
/**
@@ -166,43 +154,6 @@ static int open_connection(char *path)
return s;
}
/**
* check if the ssh agent key blob matches to our public key
*/
static bool matches_pubkey(chunk_t key, public_key_t *pubkey)
{
chunk_t pubkeydata, hash, n, e;
hasher_t *hasher;
identification_t *id;
bool match;
if (!pubkey)
{
return TRUE;
}
read_string(&key);
e = read_string(&key);
n = read_string(&key);
hasher = lib->crypto->create_hasher(lib->crypto, HASH_SHA1);
if (hasher == NULL)
{
return FALSE;
}
pubkeydata = asn1_wrap(ASN1_SEQUENCE, "mm",
asn1_integer("c", n),
asn1_integer("c", e));
hasher->allocate_hash(hasher, pubkeydata, &hash);
free(pubkeydata.ptr);
id = pubkey->get_id(pubkey, ID_PUBKEY_SHA1);
if (!id)
{
return FALSE;
}
match = chunk_equals(id->get_encoding(id), hash);
free(hash.ptr);
return match;
}
/**
* Get the first usable key from the agent
*/
@@ -210,7 +161,7 @@ static bool read_key(private_agent_private_key_t *this, public_key_t *pubkey)
{
int len, count;
char buf[2048];
chunk_t blob = chunk_from_buf(buf), key, type, tmp;
chunk_t blob = chunk_from_buf(buf), key, type, n;
len = htonl(1);
buf[0] = SSH_AGENT_ID_REQUEST;
@@ -235,27 +186,35 @@ static bool read_key(private_agent_private_key_t *this, public_key_t *pubkey)
while (blob.len)
{
key = read_string(&blob);
if (key.len)
if (!key.len)
{
break;
}
this->key = key;
type = read_string(&key);
if (!type.len || !strneq("ssh-rsa", type.ptr, type.len))
{
break;
}
read_string(&key);
n = read_string(&key);
if (n.len <= 512/8)
{
break;;
}
if (pubkey && !private_key_belongs_to(&this->public.interface, pubkey))
{
tmp = key;
type = read_string(&tmp);
read_string(&tmp);
tmp = read_string(&tmp);
if (type.len && strneq("ssh-rsa", type.ptr, type.len) &&
tmp.len >= 512/8 && matches_pubkey(key, pubkey))
{
this->key = chunk_clone(key);
this->key_size = tmp.len;
if (tmp.ptr[0] == 0)
{
this->key_size--;
}
return TRUE;
}
continue;
}
break;
this->key_size = n.len;
if (n.ptr[0] == 0)
{
this->key_size--;
}
this->key = chunk_clone(this->key);
return TRUE;
}
this->key = chunk_empty;
return FALSE;
}
@@ -357,113 +316,50 @@ static size_t get_keysize(private_agent_private_key_t *this)
return this->key_size;
}
/**
* Implementation of agent_private_key.destroy.
*/
static identification_t* get_id(private_agent_private_key_t *this,
id_type_t type)
{
switch (type)
{
case ID_PUBKEY_INFO_SHA1:
return this->keyid_info;
case ID_PUBKEY_SHA1:
return this->keyid;
default:
return NULL;
}
}
/**
* Implementation of agent_private_key.get_public_key.
*/
static public_key_t* get_public_key(private_agent_private_key_t *this)
{
chunk_t key, n, e, encoded;
public_key_t *public;
chunk_t key, n, e;
key = this->key;
read_string(&key);
e = read_string(&key);
n = read_string(&key);
encoded = asn1_wrap(ASN1_SEQUENCE, "mm",
asn1_integer("c", n),
asn1_integer("c", e));
public = lib->creds->create(lib->creds, CRED_PUBLIC_KEY, KEY_RSA,
BUILD_BLOB_ASN1_DER, encoded, BUILD_END);
free(encoded.ptr);
return public;
return lib->creds->create(lib->creds, CRED_PUBLIC_KEY, KEY_RSA,
BUILD_RSA_MODULUS, n, BUILD_RSA_PUB_EXP, e, BUILD_END);
}
/**
* Implementation of agent_private_key.belongs_to.
* Implementation of private_key_t.get_encoding
*/
static bool belongs_to(private_agent_private_key_t *this, public_key_t *public)
static bool get_encoding(private_agent_private_key_t *this,
key_encoding_type_t type, chunk_t *encoding)
{
identification_t *keyid;
if (public->get_type(public) != KEY_RSA)
{
return FALSE;
}
keyid = public->get_id(public, ID_PUBKEY_SHA1);
if (keyid && keyid->equals(keyid, this->keyid))
{
return TRUE;
}
keyid = public->get_id(public, ID_PUBKEY_INFO_SHA1);
if (keyid && keyid->equals(keyid, this->keyid_info))
{
return TRUE;
}
return FALSE;
}
/**
* Build the RSA key identifier from n and e using SHA1 hashed publicKey(Info).
* Implementation of private_key_t.get_fingerprint
*/
static bool build_ids(private_agent_private_key_t *this)
static bool get_fingerprint(private_agent_private_key_t *this,
key_encoding_type_t type, chunk_t *fp)
{
chunk_t publicKeyInfo, publicKey, hash, key, n, e;
hasher_t *hasher;
chunk_t n, e, key;
if (lib->encoding->get_cache(lib->encoding, type, this, fp))
{
return TRUE;
}
key = this->key;
read_string(&key);
e = read_string(&key);
n = read_string(&key);
hasher = lib->crypto->create_hasher(lib->crypto, HASH_SHA1);
if (hasher == NULL)
{
DBG1("SHA1 hash algorithm not supported, unable to use RSA");
return FALSE;
}
publicKey = asn1_wrap(ASN1_SEQUENCE, "mm",
asn1_integer("c", n),
asn1_integer("c", e));
hasher->allocate_hash(hasher, publicKey, &hash);
this->keyid = identification_create_from_encoding(ID_PUBKEY_SHA1, hash);
chunk_free(&hash);
publicKeyInfo = asn1_wrap(ASN1_SEQUENCE, "cm",
asn1_algorithmIdentifier(OID_RSA_ENCRYPTION),
asn1_bitstring("m", publicKey));
hasher->allocate_hash(hasher, publicKeyInfo, &hash);
this->keyid_info = identification_create_from_encoding(ID_PUBKEY_INFO_SHA1, hash);
chunk_free(&hash);
hasher->destroy(hasher);
chunk_free(&publicKeyInfo);
return TRUE;
}
/**
* Implementation of private_key_t.get_encoding.
*/
static chunk_t get_encoding(private_agent_private_key_t *this)
{
return chunk_empty;
return lib->encoding->encode(lib->encoding, type, this, fp,
KEY_PART_RSA_MODULUS, n, KEY_PART_RSA_PUB_EXP, e, KEY_PART_END);
}
/**
@@ -483,9 +379,8 @@ static void destroy(private_agent_private_key_t *this)
if (ref_put(&this->ref))
{
close(this->socket);
DESTROY_IF(this->keyid);
DESTROY_IF(this->keyid_info);
free(this->key.ptr);
lib->encoding->clear_cache(lib->encoding, this);
free(this);
}
}
@@ -502,10 +397,11 @@ static agent_private_key_t *agent_private_key_create(char *path,
this->public.interface.sign = (bool (*)(private_key_t *this, signature_scheme_t scheme, chunk_t data, chunk_t *signature))sign;
this->public.interface.decrypt = (bool (*)(private_key_t *this, chunk_t crypto, chunk_t *plain))decrypt;
this->public.interface.get_keysize = (size_t (*) (private_key_t *this))get_keysize;
this->public.interface.get_id = (identification_t* (*) (private_key_t *this,id_type_t))get_id;
this->public.interface.get_public_key = (public_key_t* (*)(private_key_t *this))get_public_key;
this->public.interface.belongs_to = (bool (*) (private_key_t *this, public_key_t *public))belongs_to;
this->public.interface.get_encoding = (chunk_t(*)(private_key_t*))get_encoding;
this->public.interface.belongs_to = private_key_belongs_to;
this->public.interface.equals = private_key_equals;
this->public.interface.get_fingerprint = (bool(*)(private_key_t*, key_encoding_type_t type, chunk_t *fp))get_fingerprint;
this->public.interface.get_encoding = (bool(*)(private_key_t*, key_encoding_type_t type, chunk_t *encoding))get_encoding;
this->public.interface.get_ref = (private_key_t* (*)(private_key_t *this))get_ref;
this->public.interface.destroy = (void (*)(private_key_t *this))destroy;
@@ -516,10 +412,9 @@ static agent_private_key_t *agent_private_key_create(char *path,
return NULL;
}
this->key = chunk_empty;
this->keyid = NULL;
this->keyid_info = NULL;
this->ref = 1;
if (!read_key(this, pubkey) || !build_ids(this))
if (!read_key(this, pubkey))
{
destroy(this);
return NULL;
@@ -528,6 +423,7 @@ static agent_private_key_t *agent_private_key_create(char *path,
}
typedef struct private_builder_t private_builder_t;
/**
* Builder implementation for key loading/generation
*/