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Preview: mod_sftp.h Size: 10.70 KB
/usr/include/proftpd/mod_sftp.h
/* mod_sftp.h.  Generated from mod_sftp.h.in by configure.  */
/*
 * ProFTPD - mod_sftp
 * Copyright (c) 2008-2023 TJ Saunders
 *
 * This program is free software; you can redistribute it and/or modify
 * 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.
 *
 * This program 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 this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Suite 500, Boston, MA 02110-1335, USA.
 *
 * As a special exemption, TJ Saunders and other respective copyright holders
 * give permission to link this program with OpenSSL, and distribute the
 * resulting executable, without including the source code for OpenSSL in the
 * source distribution.
 */

#ifndef MOD_SFTP_H
#define MOD_SFTP_H

#include "conf.h"
#include "privs.h"

#include <signal.h>

#if HAVE_MLOCK
# include <sys/mman.h>
#endif

#if HAVE_SYS_UIO_H
# include <sys/uio.h>
#endif

#ifndef MAX
# define MAX(x, y) (((x) > (y)) ? (x) : (y))
# define MIN(x, y) (((x) < (y)) ? (x) : (y))
#endif

/* Define if you have the <zlib.h> header.  */
#define HAVE_ZLIB_H 1

/* Define if you have OpenSSL with crippled AES support. */
/* #undef HAVE_AES_CRIPPLED_OPENSSL */

/* Define if you have OpenSSL with EVP_aes_128_ctr support. */
#define HAVE_EVP_AES_128_CTR_OPENSSL 1

/* Define if you have OpenSSL with EVP_aes_192_ctr support. */
#define HAVE_EVP_AES_192_CTR_OPENSSL 1

/* Define if you have OpenSSL with EVP_aes_256_ctr support. */
#define HAVE_EVP_AES_256_CTR_OPENSSL 1

/* Define if you have OpenSSL with EVP_aes_256_gcm support. */
#define HAVE_EVP_AES_256_GCM_OPENSSL 1

/* Define if you have OpenSSL with EVP_chacha20 support.
 *
 * Note, however, that older LibreSSL versions have broken ChaCha20 support.
 */
#define HAVE_EVP_CHACHA20_OPENSSL 1

#if defined(HAVE_LIBRESSL) && \
  LIBRESSL_VERSION_NUMBER < 0x3010000fL
/* # undef HAVE_BROKEN_CHACHA20 */
#endif

/* Define if you have OpenSSL with OSSL_PROVIDER_load support. */
/* #undef HAVE_OSSL_PROVIDER_LOAD_OPENSSL */

/* Define if you have OpenSSL with SHA256 support. */
#define HAVE_SHA256_OPENSSL 1

/* Define if you have OpenSSL with SHA512 support. */
#define HAVE_SHA512_OPENSSL 1

/* Define if you have OpenSSL with X448 support. */
#define HAVE_X448_OPENSSL 1

#define MOD_SFTP_VERSION	"mod_sftp/1.2.0"

/* Make sure the version of proftpd is as necessary. */
#if PROFTPD_VERSION_NUMBER < 0x0001030402
# error "ProFTPD 1.3.4rc2 or later required"
#endif

#include <openssl/bio.h>
#if !defined(OPENSSL_NO_BF)
# include <openssl/blowfish.h>
#endif /* !OPENSSL_NO_BF */
#include <openssl/bn.h>
#include <openssl/conf.h>
#if !defined(OPENSSL_NO_DES)
# include <openssl/des.h>
#endif /* !OPENSSL_NO_DES */
#include <openssl/evp.h>
#include <openssl/hmac.h>
#include <openssl/x509v3.h>
#include <openssl/err.h>
#include <openssl/rand.h>
#include <openssl/pem.h>
#if !defined(OPENSSL_NO_DSA)
# include <openssl/dsa.h>
#endif /* !OPENSSL_NO_DSA */
#include <openssl/rsa.h>
#if OPENSSL_VERSION_NUMBER > 0x000907000L
# include <openssl/aes.h>
# ifdef PR_USE_OPENSSL_ENGINE
#  include <openssl/engine.h>
# endif /* PR_USE_OPENSSL_ENGINE */
# include <openssl/ocsp.h>
#endif
#if defined(PR_USE_OPENSSL_ECC)
# include <openssl/ec.h>
# include <openssl/ecdh.h>
#endif /* PR_USE_OPENSSL_ECC */
#if defined(HAVE_OSSL_PROVIDER_LOAD_OPENSSL)
# include <openssl/provider.h>
#endif /* HAVE_OSSL_PROVIDER_LOAD_OPENSSL */

/* Define if you have the LibreSSL library.
 *
 * Note that in LibreSSL-3.5.0, the structs became opaque, as they are in
 * OpenSSL-1.1.0, and thus these version-dependent macros became more
 * complex.
 */
#if defined(LIBRESSL_VERSION_NUMBER)
# define HAVE_LIBRESSL	1
#endif

#define SFTP_ID_PREFIX		"SSH-2.0-"

/* Omit the version information in the default banner.  Sites wishing to use
 * or see that version information can configure it explicitly via ServerIdent.
 */
#define SFTP_ID_DEFAULT_STRING	SFTP_ID_PREFIX "mod_sftp"

/* mod_sftp session state flags */
#define SFTP_SESS_STATE_HAVE_KEX	0x00001
#define SFTP_SESS_STATE_HAVE_SERVICE	0x00002
#define SFTP_SESS_STATE_HAVE_AUTH	0x00004
#define SFTP_SESS_STATE_REKEYING	0x00008
#define SFTP_SESS_STATE_HAVE_EXT_INFO	0x00010

/* mod_sftp option flags */
#define SFTP_OPT_IGNORE_SFTP_UPLOAD_PERMS	0x000001
#define SFTP_OPT_IGNORE_SCP_UPLOAD_PERMS	0x000002
#define SFTP_OPT_PESSIMISTIC_KEXINIT		0x000004
#define SFTP_OPT_OLD_PROTO_COMPAT		0x000008
#define SFTP_OPT_MATCH_KEY_SUBJECT		0x000010
#define SFTP_OPT_IGNORE_SFTP_SET_PERMS		0x000020
#define SFTP_OPT_IGNORE_SFTP_SET_TIMES		0x000040
#define SFTP_OPT_IGNORE_SFTP_SET_OWNERS		0x000080
#define SFTP_OPT_IGNORE_SCP_UPLOAD_TIMES	0x000100
#define SFTP_OPT_ALLOW_INSECURE_LOGIN		0x000200
#define SFTP_OPT_INSECURE_HOSTKEY_PERMS		0x000400
#define SFTP_OPT_ALLOW_WEAK_DH			0x000800
#define SFTP_OPT_IGNORE_FIFOS			0x001000
#define SFTP_OPT_IGNORE_SFTP_UPLOAD_XATTRS	0x002000
#define SFTP_OPT_IGNORE_SFTP_SET_XATTRS		0x004000
#define SFTP_OPT_INCLUDE_SFTP_TIMES		0x008000
#define SFTP_OPT_NO_EXT_INFO			0x010000
#define SFTP_OPT_NO_HOSTKEY_ROTATION		0x020000
#define SFTP_OPT_FIDO_TOUCH_REQUIRED		0x040000
#define SFTP_OPT_FIDO_VERIFY_REQUIRED		0x080000
#define SFTP_OPT_NO_STRICT_KEX			0x100000

/* mod_sftp service flags */
#define SFTP_SERVICE_FL_SFTP		0x0001
#define SFTP_SERVICE_FL_SCP		0x0002
#define SFTP_SERVICE_FL_DATE		0x0004

#define SFTP_SERVICE_DEFAULT \
	(SFTP_SERVICE_FL_SFTP|SFTP_SERVICE_FL_SCP)

/* mod_sftp roles */
#define SFTP_ROLE_SERVER		1
#define SFTP_ROLE_CLIENT		2

/* mod_sftp generic/fake "command ID" for logging */
#define SFTP_CMD_ID		128

/* Miscellaneous */
extern int sftp_logfd;
extern const char *sftp_logname;
extern pool *sftp_pool;
extern conn_t *sftp_conn;
extern unsigned int sftp_sess_state;
extern unsigned long sftp_opts;
extern unsigned int sftp_services;

/* Used by other SFTP modules (e.g. mod_sftp_pam) for sending USERAUTH_BANNER
 * messages to the client.
 */
int sftp_auth_send_banner(const char *);

/* API for modules that which to register "keyboard-interactive" auth
 * drivers (see RFC4256).
 */

typedef struct {
  const char *challenge;

  /* TRUE or FALSE, depending on whether the user's response should be
   * displayed back to them (TRUE), or hidden (FALSE).
   */
  char display_response;

} sftp_kbdint_challenge_t;

typedef struct kbdint_st {
  const char *driver_name;

  /* Memory pool for this driver */
  pool *driver_pool;

  /* Arbitrary driver-specific data */
  void *driver_data;

  /* Open the driver for authentication. The user argument is the name of the
   * user being authenticated.  Returns zero on success, -1 otherwise
   * (with errno set appropriately).
   */
  int (*open)(struct kbdint_st *driver, const char *user);

  /* Authenticate the given user.  The driver can use the following
   * functions for writing and reading the driver challenge/response data
   * to and from the client:
   *
   *   sftp_kbdint_send_challenge()
   *   sftp_kbdint_read_response() 
   *
   * The array_header argument to the read_response() function will be
   * populated with strings from the client.
   *
   * Returns zero on success, -1 otherwise (with errno set appropriately).
   */
  int (*authenticate)(struct kbdint_st *driver, const char *user);

  /* Close the driver, clean up any allocated resources.  Returns
   * zero on success, -1 otherwise (with errno set appropriately).
   */
  int (*close)(struct kbdint_st *driver);

} sftp_kbdint_driver_t;

int sftp_kbdint_register_driver(const char *name, sftp_kbdint_driver_t *driver);
int sftp_kbdint_unregister_driver(const char *name);
int sftp_kbdint_send_challenge(const char *, const char *, uint32_t,
  sftp_kbdint_challenge_t *);
int sftp_kbdint_recv_response(pool *, uint32_t, uint32_t *,
  const char ***);

/* API for modules that which to register keystores, for the
 * SFTPAuthorizedHostKeys and SFTPAuthorizedUserKeys directives.
 */

typedef struct keystore_st {
  /* Memory pool for this keystore. */
  pool *keystore_pool;

  /* Arbitrary keystore-specific data. */
  void *keystore_data;

  /* The type of keys (host, user) that this store can handle. */
  unsigned int store_ktypes;

  /* Verify the given host key.  Returns zero on success, -1 otherwise. */
  int (*verify_host_key)(struct keystore_st *store, pool *p, const char *user,
    const char *host_fqdn, const char *host_user, unsigned char *host_key,
    uint32_t host_keylen, pr_table_t *key_notes);

  /* Verify the given user key.  Returns zero on success, -1 otherwise. */
  int (*verify_user_key)(struct keystore_st *store, pool *p, const char *user,
    unsigned char *user_key, uint32_t user_keylen, pr_table_t *key_notes);

  /* Close this keystore, clean up any allocated resources.  Returns
   * zero on success, -1 otherwise (with errno set appropriately).
   */
  int (*store_close)(struct keystore_st *store);

} sftp_keystore_t;

#define SFTP_SSH2_HOST_KEY_STORE	0x01
#define SFTP_SSH2_USER_KEY_STORE	0x02

/* Known/supported RFC4716 headers. */
#define SFTP_KEYSTORE_HEADER_COMMENT			"Comment"
#define SFTP_KEYSTORE_HEADER_SUBJECT			"Subject"
#define SFTP_KEYSTORE_HEADER_FIDO_TOUCH_REQUIRED	"X-FIDO-Touch-Required"
#define SFTP_KEYSTORE_HEADER_FIDO_VERIFY_REQUIRED	"X-FIDO-Verify-Required"

int sftp_keystore_register_store(const char *,
  sftp_keystore_t *(*store_open)(pool *, int, const char *, const char *),
  unsigned int);
int sftp_keystore_unregister_store(const char *, unsigned int);

/* For use by keystore backend modules. */
int sftp_keys_compare_keys(pool *, unsigned char *, uint32_t, unsigned char *,
  uint32_t);

/* These strings are part of any RFC4716 key; thus they will be needed by
 * any keystore backend modules.
 */
#define SFTP_SSH2_PUBKEY_BEGIN_MARKER   "---- BEGIN SSH2 PUBLIC KEY ----"
#define SFTP_SSH2_PUBKEY_END_MARKER     "---- END SSH2 PUBLIC KEY ----"

/* For use by other SFTP modules. */
const char *sftp_crypto_get_errors(void);

/* For use by other modules to register 'exec' channel request handlers.
 *
 * Note that the implementation currently assumes that the registering module
 * is registering its callbacks from a session process, i.e. post-fork(2).
 * That is why there is no corresponding unregister function at present.
 */
int sftp_channel_register_exec_handler(module *, const char *,
  int (*set_params)(pool *, uint32_t, array_header *),
  int (*prep_chan)(uint32_t),
  int (*postopen_chan)(uint32_t),
  int (*handle_pkt)(pool *, void *, uint32_t, unsigned char *, uint32_t),
  int (*finish_chan)(uint32_t),
  int (**write_data)(pool *, uint32_t, unsigned char *, uint32_t));

#endif

Directory Contents

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ascii.h
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auth.h
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base.h
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bindings.h
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buildstamp.h
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ccan-json.h
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child.h
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class.h
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cmd.h
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compat.h
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conf.h
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config.h
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configdb.h
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ctrls.h
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data.h
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default_paths.h
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dirtree.h
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display.h
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encode.h
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env.h
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error.h
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event.h
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expr.h
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feat.h
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filter.h
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fsio.h
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ftp.h
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glibc-glob.h
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hanson-tpl.h
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help.h
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ident.h
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inet.h
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jot.h
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json.h
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lastlog.h
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log.h
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logfmt.h
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memcache.h
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mkhome.h
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modules.h
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mod_ctrls.h
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mod_sftp.h
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mod_tls.h
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netacl.h
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netaddr.h
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netio.h
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openbsd-blowfish.h
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options.h
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os.h
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parser.h
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pidfile.h
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pool.h
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pr-syslog.h
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privs.h
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proctitle.h
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proftpd.h
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random.h
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redis.h
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regexp.h
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response.h
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rlimit.h
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scoreboard.h
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session.h
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sets.h
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signals.h
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stash.h
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str.h
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support.h
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table.h
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throttle.h
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timers.h
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trace.h
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utf8.h
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var.h
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version.h
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xferlog.h
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