/* -*-c-*-
- *
- * $Id$
*
* Main header file for TrIPE
*
* (c) 2001 Straylight/Edgeware
*/
-/*----- Licensing notice --------------------------------------------------*
+/*----- Licensing notice --------------------------------------------------*
*
* This file is part of Trivial IP Encryption (TrIPE).
*
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
- *
+ *
* TrIPE 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 General Public License for more details.
- *
+ *
* You should have received a copy of the GNU General Public License
* along with TrIPE; if not, write to the Free Software Foundation,
* Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
#include <mLib/arena.h>
#include <mLib/base64.h>
#include <mLib/bres.h>
+#include <mLib/daemonize.h>
#include <mLib/dstr.h>
#include <mLib/env.h>
#include <mLib/fdflags.h>
#include <mLib/fwatch.h>
+#include <mLib/hash.h>
+#include <mLib/macros.h>
#include <mLib/mdwopt.h>
#include <mLib/quis.h>
#include <mLib/report.h>
#include <mLib/sub.h>
#include <mLib/trace.h>
#include <mLib/tv.h>
+#include <mLib/versioncmp.h>
#include <catacomb/buf.h>
#include <catacomb/group.h>
#include "protocol.h"
+#include "slip.h"
#include "util.h"
#undef sun
const gcmac *m; /* Message authentication code */
size_t hashsz; /* Hash output size */
size_t tagsz; /* Length to truncate MAC tags */
+ size_t expsz; /* Size of data to process */
size_t cksz, mksz; /* Key lengths for @c@ and @m@ */
} algswitch;
struct sockaddr_in sin;
} addr;
+/* --- Mapping keyed on addresses --- */
+
+typedef struct addrmap {
+ hash_table t;
+ size_t load;
+} addrmap;
+
+typedef struct addrmap_base {
+ hash_base b;
+ addr a;
+} addrmap_base;
+
/* --- Sequence number checking --- */
typedef struct seqwin {
unsigned ref; /* Reference count for keyset */
struct peer *p; /* Pointer to peer structure */
time_t t_exp; /* Expiry time for this keyset */
- unsigned long sz_exp; /* Data limit for the keyset */
+ unsigned long sz_exp, sz_regen; /* Data limits for the keyset */
T( unsigned seq; ) /* Sequence number for tracing */
unsigned f; /* Various useful flags */
- gcipher *cin, *cout; /* Keyset ciphers for encryption */
+ gcipher *cin, *cout; /* Keyset ciphers for encryption */
size_t tagsz; /* Length to truncate MAC tags */
- gmac *min, *mout; /* Keyset MACs for integrity */
+ gmac *min, *mout; /* Keyset MACs for integrity */
uint32 oseq; /* Outbound sequence number */
seqwin iseq; /* Inbound sequence number */
} keyset;
#define KSF_LISTEN 1u /* Don't encrypt packets yet */
#define KSF_LINK 2u /* Key is in a linked list */
+#define KSERR_REGEN -1 /* Regenerate keys */
+#define KSERR_NOKEYS -2 /* No keys left */
+#define KSERR_DECRYPT -3 /* Unable to decrypt message */
+
/* --- Key exchange --- *
*
* TrIPE uses the Wrestlers Protocol for its key exchange. The Wrestlers
#define KXF_TIMER 1u /* Waiting for a timer to go off */
#define KXF_DEAD 2u /* The key-exchanger isn't up */
#define KXF_PUBKEY 4u /* Key exchanger has a public key */
+#define KXF_CORK 8u /* Don't send anything yet */
enum {
KXS_DEAD, /* Uninitialized state (magical) */
typedef struct tunnel_ops {
const char *name; /* Name of this tunnel driver */
void (*init)(void); /* Initializes the system */
- tunnel *(*create)(struct peer */*p*/); /* Initializes a new tunnel */
- const char *(*ifname)(tunnel */*t*/); /* Returns tunnel's interface name */
+ int (*open)(char **/*ifn*/); /* Open tunnel and report ifname */
+ tunnel *(*create)(struct peer */*p*/, int /*fd*/, char **/*ifn*/);
+ /* Initializes a new tunnel */
+ void (*setifname)(tunnel */*t*/, const char */*ifn*/);
+ /* Notifies ifname change */
void (*inject)(tunnel */*t*/, buf */*b*/); /* Sends packet through if */
void (*destroy)(tunnel */*t*/); /* Destroys a tunnel */
} tunnel_ops;
unsigned long t_ka; /* Keep alive interval */
addr sa; /* Socket address to speak to */
size_t sasz; /* Socket address size */
+ unsigned kxf; /* Key exchange flags to set */
} peerspec;
+typedef struct peer_byname {
+ sym_base _b;
+ struct peer *p;
+} peer_byname;
+
+typedef struct peer_byaddr {
+ addrmap_base _b;
+ struct peer *p;
+} peer_byaddr;
+
typedef struct peer {
- struct peer *next, *prev; /* Links to next and previous */
+ peer_byname *byname; /* Lookup-by-name block */
+ peer_byaddr *byaddr; /* Lookup-by-address block */
struct ping *pings; /* Pings we're waiting for */
peerspec spec; /* Specifications for this peer */
tunnel *t; /* Tunnel for local packets */
sel_timer tka; /* Timer for keepalives */
} peer;
+typedef struct peer_iter { sym_iter i; } peer_iter;
+
typedef struct ping {
struct ping *next, *prev; /* Links to next and previous */
peer *p; /* Peer so we can free it */
typedef struct admin_svcop {
admin_bgop bg; /* Background operation header */
struct admin *prov; /* Client servicing this job */
- unsigned short index; /* This job's index */
+ unsigned index; /* This job's index */
struct admin_svcop *next, *prev; /* Links for provider's jobs */
} admin_svcop;
#ifndef NTRACE
#define AF_TRACE 16u /* Catch tracing */
#endif
+#define AF_FOREGROUND 32u /* Quit server when client closes */
#ifndef NTRACE
# define AF_ALLMSGS (AF_NOTE | AF_TRACE | AF_WARN)
extern size_t indexsz; /* Size of exponent for the group */
extern mp *kpriv; /* Our private key */
extern ge *kpub; /* Our public key */
-extern octet buf_i[PKBUFSZ], buf_o[PKBUFSZ], buf_t[PKBUFSZ];
+extern octet buf_i[PKBUFSZ], buf_o[PKBUFSZ], buf_t[PKBUFSZ], buf_u[PKBUFSZ];
extern const tunnel_ops *tunnels[]; /* Table of tunnels (0-term) */
extern const tunnel_ops *tun_default; /* Default tunnel to use */
* Arguments: @keyexch *kx@ = pointer to key exchange context
* @peer *p@ = pointer to peer context
* @keyset **ks@ = pointer to keyset list
+ * @unsigned f@ = various useful flags
*
* Returns: Zero if OK, nonzero if it failed.
*
* exchange.
*/
-extern int kx_init(keyexch */*kx*/, peer */*p*/, keyset **/*ks*/);
+extern int kx_init(keyexch */*kx*/, peer */*p*/,
+ keyset **/*ks*/, unsigned /*f*/);
/*----- Keysets and symmetric cryptography --------------------------------*/
* @buf *b@ = pointer to input buffer
* @buf *bb@ = pointer to output buffer
*
- * Returns: Zero if OK, nonzero if the key needs replacing. If the
- * encryption failed, the output buffer is broken and zero is
- * returned.
+ * Returns: Zero if successful; @KSERR_REGEN@ if we should negotiate a
+ * new key; @KSERR_NOKEYS@ if the key is not usable. Also
+ * returns zero if there was insufficient buffer (but the output
+ * buffer is broken in this case).
*
* Use: Encrypts a block of data using the key. Note that the `key
* ought to be replaced' notification is only ever given once
* @buf *b@ = pointer to an input buffer
* @buf *bb@ = pointer to an output buffer
*
- * Returns: Zero on success, or nonzero if there was some problem.
+ * Returns: Zero on success; @KSERR_DECRYPT@ on failure. Also returns
+ * zero if there was insufficient buffer (but the output buffer
+ * is broken in this case).
*
* Use: Attempts to decrypt a message using a given key. Note that
* requesting decryption with a key directly won't clear a
* @buf *b@ = pointer to input buffer
* @buf *bb@ = pointer to output buffer
*
- * Returns: Nonzero if a new key is needed.
+ * Returns: Zero if successful; @KSERR_REGEN@ if it's time to negotiate a
+ * new key; @KSERR_NOKEYS@ if there are no suitable keys
+ * available. Also returns zero if there was insufficient
+ * buffer space (but the output buffer is broken in this case).
*
* Use: Encrypts a packet.
*/
* @buf *b@ = pointer to input buffer
* @buf *bb@ = pointer to output buffer
*
- * Returns: Nonzero if the packet couldn't be decrypted.
+ * Returns: Zero on success; @KSERR_DECRYPT@ on failure. Also returns
+ * zero if there was insufficient buffer (but the output buffer
+ * is broken in this case).
*
* Use: Decrypts a packet.
*/
extern void a_init(const char */*sock*/);
+/*----- Mapping with addresses as keys ------------------------------------*/
+
+/* --- @am_create@ --- *
+ *
+ * Arguments: @addrmap *m@ = pointer to map
+ *
+ * Returns: ---
+ *
+ * Use: Create an address map, properly set up.
+ */
+
+extern void am_create(addrmap */*m*/);
+
+/* --- @am_destroy@ --- *
+ *
+ * Arguments: @addrmap *m@ = pointer to map
+ *
+ * Returns: ---
+ *
+ * Use: Destroy an address map, throwing away all the entries.
+ */
+
+extern void am_destroy(addrmap */*m*/);
+
+/* --- @am_find@ --- *
+ *
+ * Arguments: @addrmap *m@ = pointer to map
+ * @const addr *a@ = address to look up
+ * @size_t sz@ = size of block to allocate
+ * @unsigned *f@ = where to store flags
+ *
+ * Returns: Pointer to found item, or null.
+ *
+ * Use: Finds a record with the given IP address, set @*f@ nonzero
+ * and returns it. If @sz@ is zero, and no match was found,
+ * return null; otherwise allocate a new block of @sz@ bytes,
+ * clear @*f@ to zero and return the block pointer.
+ */
+
+extern void *am_find(addrmap */*m*/, const addr */*a*/,
+ size_t /*sz*/, unsigned */*f*/);
+
+/* --- @am_remove@ --- *
+ *
+ * Arguments: @addrmap *m@ = pointer to map
+ * @void *i@ = pointer to the item
+ *
+ * Returns: ---
+ *
+ * Use: Removes an item from the map.
+ */
+
+extern void am_remove(addrmap */*m*/, void */*i*/);
+
/*----- Peer management ---------------------------------------------------*/
/* --- @p_txstart@ --- *
extern const peerspec *p_spec(peer */*p*/);
+/* --- @p_findbyaddr@ --- *
+ *
+ * Arguments: @const addr *a@ = address to look up
+ *
+ * Returns: Pointer to the peer block, or null if not found.
+ *
+ * Use: Finds a peer by address.
+ */
+
+extern peer *p_findbyaddr(const addr */*a*/);
+
/* --- @p_find@ --- *
*
* Arguments: @const char *name@ = name to look up
extern void p_destroy(peer */*p*/);
-/* --- @p_first@, @p_next@ --- *
+/* --- @FOREACH_PEER@ --- *
+ *
+ * Arguments: @p@ = name to bind to each peer
+ * @stuff@ = thing to do for each item
+ *
+ * Use: Does something for each current peer.
+ */
+
+#define FOREACH_PEER(p, stuff) do { \
+ peer_iter i_; \
+ peer *p; \
+ for (p_mkiter(&i_); (p = p_next(&i_)) != 0; ) do stuff while (0); \
+} while (0)
+
+/* --- @p_mkiter@ --- *
+ *
+ * Arguments: @peer_iter *i@ = pointer to an iterator
+ *
+ * Returns: ---
+ *
+ * Use: Initializes the iterator.
+ */
+
+extern void p_mkiter(peer_iter */*i*/);
+
+/* --- @p_next@ --- *
+ *
+ * Arguments: @peer_iter *i@ = pointer to an iterator
*
- * Arguments: @peer *p@ = a peer block
+ * Returns: Next peer, or null if at the end.
*
- * Returns: @peer_first@ returns the first peer in some ordering;
- * @peer_next@ returns the peer following a given one in the
- * same ordering. Null is returned for the end of the list.
+ * Use: Returns the next peer.
*/
-extern peer *p_first(void);
-extern peer *p_next(peer */*p*/);
+extern peer *p_next(peer_iter */*i*/);
/*----- Tunnel drivers ----------------------------------------------------*/
* Returns: A pointer to the integer's textual representation.
*
* Use: Converts a multiprecision integer to a string. Corrupts
- * @buf_t@.
+ * @buf_u@.
*/
extern const char *mpstr(mp */*m*/);
* Returns: A pointer to the element's textual representation.
*
* Use: Converts a group element to a string. Corrupts
- * @buf_t@.
+ * @buf_u@.
*/
extern const char *gestr(group */*g*/, ge */*x*/);
* Returns: A pointer to a textual representation of the time.
*
* Use: Converts a time to a textual representation. Corrupts
- * @buf_t@.
+ * @buf_u@.
*/
extern const char *timestr(time_t /*t*/);
extern int seq_check(seqwin */*s*/, uint32 /*q*/, const char */*service*/);
-/* --- @versioncmp@ --- *
- *
- * Arguments: @const char *va, *vb@ = two version strings
- *
- * Returns: Less than, equal to, or greater than zero, according to
- * whether @va@ is less than, equal to, or greater than @vb@.
- *
- * Use: Compares version number strings.
- *
- * The algorithm is an extension of the Debian version
- * comparison algorithm. A version number consists of three
- * components:
- *
- * [EPOCH :] MAIN [- SUB]
- *
- * The MAIN part may contain colons or hyphens if there is an
- * EPOCH or SUB, respectively. Version strings are compared
- * componentwise: first epochs, then main parts, and finally
- * subparts.
- *
- * The component comparison is done as follows. First, the
- * initial subsequence of nondigit characters is extracted from
- * each string, and these are compared lexicographically, using
- * ASCII ordering, except that letters precede non-letters. If
- * both are the same, an initial sequence of digits is extracted
- * from the remaining parts of the version strings, and these
- * are compared numerically (an empty sequence being considered
- * to have the value zero). This process is repeated until we
- * have a winner or until both strings are exhausted.
- */
-
-extern int versioncmp(const char */*va*/, const char */*vb*/);
-
/*----- That's all, folks -------------------------------------------------*/
#ifdef __cplusplus
~mdw / tripe / blobdiff