#include #include #include "puttymem.h" #include "tree234.h" #include "network.h" #include "int64.h" #include "misc.h" struct ssh_channel; typedef struct ssh_tag *Ssh; extern int sshfwd_write(struct ssh_channel *c, char *, int); extern void sshfwd_write_eof(struct ssh_channel *c); extern void sshfwd_unclean_close(struct ssh_channel *c, const char *err); extern void sshfwd_unthrottle(struct ssh_channel *c, int bufsize); Conf *sshfwd_get_conf(struct ssh_channel *c); void sshfwd_x11_sharing_handover(struct ssh_channel *c, void *share_cs, void *share_chan, const char *peer_addr, int peer_port, int endian, int protomajor, int protominor, const void *initial_data, int initial_len); void sshfwd_x11_is_local(struct ssh_channel *c); extern Socket ssh_connection_sharing_init(const char *host, int port, Conf *conf, Ssh ssh, void **state); int ssh_share_test_for_upstream(const char *host, int port, Conf *conf); void share_got_pkt_from_server(void *ctx, int type, unsigned char *pkt, int pktlen); void share_activate(void *state, const char *server_verstring); void sharestate_free(void *state); int share_ndownstreams(void *state); void ssh_connshare_log(Ssh ssh, int event, const char *logtext, const char *ds_err, const char *us_err); unsigned ssh_alloc_sharing_channel(Ssh ssh, void *sharing_ctx); void ssh_delete_sharing_channel(Ssh ssh, unsigned localid); int ssh_alloc_sharing_rportfwd(Ssh ssh, const char *shost, int sport, void *share_ctx); void ssh_sharing_queue_global_request(Ssh ssh, void *share_ctx); struct X11FakeAuth *ssh_sharing_add_x11_display(Ssh ssh, int authtype, void *share_cs, void *share_chan); void ssh_sharing_remove_x11_display(Ssh ssh, struct X11FakeAuth *auth); void ssh_send_packet_from_downstream(Ssh ssh, unsigned id, int type, const void *pkt, int pktlen, const char *additional_log_text); void ssh_sharing_downstream_connected(Ssh ssh, unsigned id, const char *peerinfo); void ssh_sharing_downstream_disconnected(Ssh ssh, unsigned id); void ssh_sharing_logf(Ssh ssh, unsigned id, const char *logfmt, ...); int ssh_agent_forwarding_permitted(Ssh ssh); void share_setup_x11_channel(void *csv, void *chanv, unsigned upstream_id, unsigned server_id, unsigned server_currwin, unsigned server_maxpkt, unsigned client_adjusted_window, const char *peer_addr, int peer_port, int endian, int protomajor, int protominor, const void *initial_data, int initial_len); /* * Useful thing. */ #ifndef lenof #define lenof(x) ( (sizeof((x))) / (sizeof(*(x)))) #endif #define SSH_CIPHER_IDEA 1 #define SSH_CIPHER_DES 2 #define SSH_CIPHER_3DES 3 #define SSH_CIPHER_BLOWFISH 6 #ifdef MSCRYPTOAPI #define APIEXTRA 8 #else #define APIEXTRA 0 #endif #ifndef BIGNUM_INTERNAL typedef void *Bignum; #endif struct RSAKey { int bits; int bytes; #ifdef MSCRYPTOAPI unsigned long exponent; unsigned char *modulus; #else Bignum modulus; Bignum exponent; Bignum private_exponent; Bignum p; Bignum q; Bignum iqmp; #endif char *comment; }; struct dss_key { Bignum p, q, g, y, x; }; struct ec_curve; struct ec_point { const struct ec_curve *curve; Bignum x, y; Bignum z; /* Jacobian denominator */ unsigned char infinity; }; void ec_point_free(struct ec_point *point); /* Weierstrass form curve */ struct ec_wcurve { Bignum a, b, n; struct ec_point G; }; /* Montgomery form curve */ struct ec_mcurve { Bignum a, b; struct ec_point G; }; /* Edwards form curve */ struct ec_ecurve { Bignum l, d; struct ec_point B; }; struct ec_curve { enum { EC_WEIERSTRASS, EC_MONTGOMERY, EC_EDWARDS } type; /* 'name' is the identifier of the curve when it has to appear in * wire protocol encodings, as it does in e.g. the public key and * signature formats for NIST curves. Curves which do not format * their keys or signatures in this way just have name==NULL. * * 'textname' is non-NULL for all curves, and is a human-readable * identification suitable for putting in log messages. */ const char *name, *textname; unsigned int fieldBits; Bignum p; union { struct ec_wcurve w; struct ec_mcurve m; struct ec_ecurve e; }; }; const struct ssh_signkey *ec_alg_by_oid(int len, const void *oid, const struct ec_curve **curve); const unsigned char *ec_alg_oid(const struct ssh_signkey *alg, int *oidlen); extern const int ec_nist_curve_lengths[], n_ec_nist_curve_lengths; int ec_nist_alg_and_curve_by_bits(int bits, const struct ec_curve **curve, const struct ssh_signkey **alg); int ec_ed_alg_and_curve_by_bits(int bits, const struct ec_curve **curve, const struct ssh_signkey **alg); struct ssh_signkey; struct ec_key { const struct ssh_signkey *signalg; struct ec_point publicKey; Bignum privateKey; }; struct ec_point *ec_public(const Bignum privateKey, const struct ec_curve *curve); int makekey(const unsigned char *data, int len, struct RSAKey *result, const unsigned char **keystr, int order); int makeprivate(const unsigned char *data, int len, struct RSAKey *result); int rsaencrypt(unsigned char *data, int length, struct RSAKey *key); Bignum rsadecrypt(Bignum input, struct RSAKey *key); void rsasign(unsigned char *data, int length, struct RSAKey *key); void rsasanitise(struct RSAKey *key); int rsastr_len(struct RSAKey *key); void rsastr_fmt(char *str, struct RSAKey *key); void rsa_fingerprint(char *str, int len, struct RSAKey *key); int rsa_verify(struct RSAKey *key); unsigned char *rsa_public_blob(struct RSAKey *key, int *len); int rsa_public_blob_len(void *data, int maxlen); void freersakey(struct RSAKey *key); #ifndef PUTTY_UINT32_DEFINED /* This makes assumptions about the int type. */ typedef unsigned int uint32; #define PUTTY_UINT32_DEFINED #endif typedef uint32 word32; unsigned long crc32_compute(const void *s, size_t len); unsigned long crc32_update(unsigned long crc_input, const void *s, size_t len); /* SSH CRC compensation attack detector */ void *crcda_make_context(void); void crcda_free_context(void *handle); int detect_attack(void *handle, unsigned char *buf, uint32 len, unsigned char *IV); /* * SSH2 RSA key exchange functions */ struct ssh_hash; void *ssh_rsakex_newkey(char *data, int len); void ssh_rsakex_freekey(void *key); int ssh_rsakex_klen(void *key); void ssh_rsakex_encrypt(const struct ssh_hash *h, unsigned char *in, int inlen, unsigned char *out, int outlen, void *key); /* * SSH2 ECDH key exchange functions */ struct ssh_kex; const char *ssh_ecdhkex_curve_textname(const struct ssh_kex *kex); void *ssh_ecdhkex_newkey(const struct ssh_kex *kex); void ssh_ecdhkex_freekey(void *key); char *ssh_ecdhkex_getpublic(void *key, int *len); Bignum ssh_ecdhkex_getkey(void *key, char *remoteKey, int remoteKeyLen); /* * Helper function for k generation in DSA, reused in ECDSA */ Bignum *dss_gen_k(const char *id_string, Bignum modulus, Bignum private_key, unsigned char *digest, int digest_len); typedef struct { uint32 h[4]; } MD5_Core_State; struct MD5Context { #ifdef MSCRYPTOAPI unsigned long hHash; #else MD5_Core_State core; unsigned char block[64]; int blkused; uint32 lenhi, lenlo; #endif }; void MD5Init(struct MD5Context *context); void MD5Update(struct MD5Context *context, unsigned char const *buf, unsigned len); void MD5Final(unsigned char digest[16], struct MD5Context *context); void MD5Simple(void const *p, unsigned len, unsigned char output[16]); void *hmacmd5_make_context(void *); void hmacmd5_free_context(void *handle); void hmacmd5_key(void *handle, void const *key, int len); void hmacmd5_do_hmac(void *handle, unsigned char const *blk, int len, unsigned char *hmac); typedef struct { uint32 h[5]; unsigned char block[64]; int blkused; uint32 lenhi, lenlo; } SHA_State; void SHA_Init(SHA_State * s); void SHA_Bytes(SHA_State * s, const void *p, int len); void SHA_Final(SHA_State * s, unsigned char *output); void SHA_Simple(const void *p, int len, unsigned char *output); void hmac_sha1_simple(void *key, int keylen, void *data, int datalen, unsigned char *output); typedef struct { uint32 h[8]; unsigned char block[64]; int blkused; uint32 lenhi, lenlo; } SHA256_State; void SHA256_Init(SHA256_State * s); void SHA256_Bytes(SHA256_State * s, const void *p, int len); void SHA256_Final(SHA256_State * s, unsigned char *output); void SHA256_Simple(const void *p, int len, unsigned char *output); typedef struct { uint64 h[8]; unsigned char block[128]; int blkused; uint32 len[4]; } SHA512_State; #define SHA384_State SHA512_State void SHA512_Init(SHA512_State * s); void SHA512_Bytes(SHA512_State * s, const void *p, int len); void SHA512_Final(SHA512_State * s, unsigned char *output); void SHA512_Simple(const void *p, int len, unsigned char *output); void SHA384_Init(SHA384_State * s); #define SHA384_Bytes(s, p, len) SHA512_Bytes(s, p, len) void SHA384_Final(SHA384_State * s, unsigned char *output); void SHA384_Simple(const void *p, int len, unsigned char *output); struct ssh_mac; struct ssh_cipher { void *(*make_context)(void); void (*free_context)(void *); void (*sesskey) (void *, unsigned char *key); /* for SSH-1 */ void (*encrypt) (void *, unsigned char *blk, int len); void (*decrypt) (void *, unsigned char *blk, int len); int blksize; const char *text_name; }; struct ssh2_cipher { void *(*make_context)(void); void (*free_context)(void *); void (*setiv) (void *, unsigned char *key); /* for SSH-2 */ void (*setkey) (void *, unsigned char *key);/* for SSH-2 */ void (*encrypt) (void *, unsigned char *blk, int len); void (*decrypt) (void *, unsigned char *blk, int len); /* Ignored unless SSH_CIPHER_SEPARATE_LENGTH flag set */ void (*encrypt_length) (void *, unsigned char *blk, int len, unsigned long seq); void (*decrypt_length) (void *, unsigned char *blk, int len, unsigned long seq); const char *name; int blksize; /* real_keybits is the number of bits of entropy genuinely used by * the cipher scheme; it's used for deciding how big a * Diffie-Hellman group is needed to exchange a key for the * cipher. */ int real_keybits; /* padded_keybytes is the number of bytes of key data expected as * input to the setkey function; it's used for deciding how much * data needs to be generated from the post-kex generation of key * material. In a sensible cipher which uses all its key bytes for * real work, this will just be real_keybits/8, but in DES-type * ciphers which ignore one bit in each byte, it'll be slightly * different. */ int padded_keybytes; unsigned int flags; #define SSH_CIPHER_IS_CBC 1 #define SSH_CIPHER_SEPARATE_LENGTH 2 const char *text_name; /* If set, this takes priority over other MAC. */ const struct ssh_mac *required_mac; }; struct ssh2_ciphers { int nciphers; const struct ssh2_cipher *const *list; }; struct ssh_mac { /* Passes in the cipher context */ void *(*make_context)(void *); void (*free_context)(void *); void (*setkey) (void *, unsigned char *key); /* whole-packet operations */ void (*generate) (void *, unsigned char *blk, int len, unsigned long seq); int (*verify) (void *, unsigned char *blk, int len, unsigned long seq); /* partial-packet operations */ void (*start) (void *); void (*bytes) (void *, unsigned char const *, int); void (*genresult) (void *, unsigned char *); int (*verresult) (void *, unsigned char const *); const char *name, *etm_name; int len, keylen; const char *text_name; }; struct ssh_hash { void *(*init)(void); /* also allocates context */ void *(*copy)(const void *); void (*bytes)(void *, const void *, int); void (*final)(void *, unsigned char *); /* also frees context */ void (*free)(void *); int hlen; /* output length in bytes */ const char *text_name; }; struct ssh_kex { const char *name, *groupname; enum { KEXTYPE_DH, KEXTYPE_RSA, KEXTYPE_ECDH } main_type; const struct ssh_hash *hash; const void *extra; /* private to the kex methods */ }; struct ssh_kexes { int nkexes; const struct ssh_kex *const *list; }; struct ssh_signkey { void *(*newkey) (const struct ssh_signkey *self, const char *data, int len); void (*freekey) (void *key); char *(*fmtkey) (void *key); unsigned char *(*public_blob) (void *key, int *len); unsigned char *(*private_blob) (void *key, int *len); void *(*createkey) (const struct ssh_signkey *self, const unsigned char *pub_blob, int pub_len, const unsigned char *priv_blob, int priv_len); void *(*openssh_createkey) (const struct ssh_signkey *self, const unsigned char **blob, int *len); int (*openssh_fmtkey) (void *key, unsigned char *blob, int len); /* OpenSSH private key blobs, as created by openssh_fmtkey and * consumed by openssh_createkey, always (at least so far...) take * the form of a number of SSH-2 strings / mpints concatenated * end-to-end. Because the new-style OpenSSH private key format * stores those blobs without a containing string wrapper, we need * to know how many strings each one consists of, so that we can * skip over the right number to find the next key in the file. * openssh_private_npieces gives that information. */ int openssh_private_npieces; int (*pubkey_bits) (const struct ssh_signkey *self, const void *blob, int len); int (*verifysig) (void *key, const char *sig, int siglen, const char *data, int datalen); unsigned char *(*sign) (void *key, const char *data, int datalen, int *siglen); const char *name; const char *keytype; /* for host key cache */ const void *extra; /* private to the public key methods */ }; struct ssh_compress { const char *name; /* For zlib@openssh.com: if non-NULL, this name will be considered once * userauth has completed successfully. */ const char *delayed_name; void *(*compress_init) (void); void (*compress_cleanup) (void *); int (*compress) (void *, unsigned char *block, int len, unsigned char **outblock, int *outlen); void *(*decompress_init) (void); void (*decompress_cleanup) (void *); int (*decompress) (void *, unsigned char *block, int len, unsigned char **outblock, int *outlen); int (*disable_compression) (void *); const char *text_name; }; struct ssh2_userkey { const struct ssh_signkey *alg; /* the key algorithm */ void *data; /* the key data */ char *comment; /* the key comment */ }; /* The maximum length of any hash algorithm used in kex. (bytes) */ #define SSH2_KEX_MAX_HASH_LEN (64) /* SHA-512 */ extern const struct ssh_cipher ssh_3des; extern const struct ssh_cipher ssh_des; extern const struct ssh_cipher ssh_blowfish_ssh1; extern const struct ssh2_ciphers ssh2_3des; extern const struct ssh2_ciphers ssh2_des; extern const struct ssh2_ciphers ssh2_aes; extern const struct ssh2_ciphers ssh2_blowfish; extern const struct ssh2_ciphers ssh2_arcfour; extern const struct ssh2_ciphers ssh2_ccp; extern const struct ssh_hash ssh_sha1; extern const struct ssh_hash ssh_sha256; extern const struct ssh_hash ssh_sha384; extern const struct ssh_hash ssh_sha512; extern const struct ssh_kexes ssh_diffiehellman_group1; extern const struct ssh_kexes ssh_diffiehellman_group14; extern const struct ssh_kexes ssh_diffiehellman_gex; extern const struct ssh_kexes ssh_rsa_kex; extern const struct ssh_kexes ssh_ecdh_kex; extern const struct ssh_signkey ssh_dss; extern const struct ssh_signkey ssh_rsa; extern const struct ssh_signkey ssh_ecdsa_ed25519; extern const struct ssh_signkey ssh_ecdsa_nistp256; extern const struct ssh_signkey ssh_ecdsa_nistp384; extern const struct ssh_signkey ssh_ecdsa_nistp521; extern const struct ssh_mac ssh_hmac_md5; extern const struct ssh_mac ssh_hmac_sha1; extern const struct ssh_mac ssh_hmac_sha1_buggy; extern const struct ssh_mac ssh_hmac_sha1_96; extern const struct ssh_mac ssh_hmac_sha1_96_buggy; extern const struct ssh_mac ssh_hmac_sha256; void *aes_make_context(void); void aes_free_context(void *handle); void aes128_key(void *handle, unsigned char *key); void aes192_key(void *handle, unsigned char *key); void aes256_key(void *handle, unsigned char *key); void aes_iv(void *handle, unsigned char *iv); void aes_ssh2_encrypt_blk(void *handle, unsigned char *blk, int len); void aes_ssh2_decrypt_blk(void *handle, unsigned char *blk, int len); /* * PuTTY version number formatted as an SSH version string. */ extern const char sshver[]; /* * Gross hack: pscp will try to start SFTP but fall back to scp1 if * that fails. This variable is the means by which scp.c can reach * into the SSH code and find out which one it got. */ extern int ssh_fallback_cmd(void *handle); #ifndef MSCRYPTOAPI void SHATransform(word32 * digest, word32 * data); #endif int random_byte(void); void random_add_noise(void *noise, int length); void random_add_heavynoise(void *noise, int length); void logevent(void *, const char *); struct PortForwarding; /* Allocate and register a new channel for port forwarding */ void *new_sock_channel(void *handle, struct PortForwarding *pf); void ssh_send_port_open(void *channel, const char *hostname, int port, const char *org); /* Exports from portfwd.c */ extern char *pfd_connect(struct PortForwarding **pf, char *hostname, int port, void *c, Conf *conf, int addressfamily); extern void pfd_close(struct PortForwarding *); extern int pfd_send(struct PortForwarding *, char *data, int len); extern void pfd_send_eof(struct PortForwarding *); extern void pfd_confirm(struct PortForwarding *); extern void pfd_unthrottle(struct PortForwarding *); extern void pfd_override_throttle(struct PortForwarding *, int enable); struct PortListener; /* desthost == NULL indicates dynamic (SOCKS) port forwarding */ extern char *pfl_listen(char *desthost, int destport, char *srcaddr, int port, void *backhandle, Conf *conf, struct PortListener **pl, int address_family); extern void pfl_terminate(struct PortListener *); /* Exports from x11fwd.c */ enum { X11_TRANS_IPV4 = 0, X11_TRANS_IPV6 = 6, X11_TRANS_UNIX = 256 }; struct X11Display { /* Broken-down components of the display name itself */ int unixdomain; char *hostname; int displaynum; int screennum; /* OSX sometimes replaces all the above with a full Unix-socket pathname */ char *unixsocketpath; /* PuTTY networking SockAddr to connect to the display, and associated * gubbins */ SockAddr addr; int port; char *realhost; /* Our local auth details for talking to the real X display. */ int localauthproto; unsigned char *localauthdata; int localauthdatalen; }; struct X11FakeAuth { /* Auth details we invented for a virtual display on the SSH server. */ int proto; unsigned char *data; int datalen; char *protoname; char *datastring; /* The encrypted form of the first block, in XDM-AUTHORIZATION-1. * Used as part of the key when these structures are organised * into a tree. See x11_invent_fake_auth for explanation. */ unsigned char *xa1_firstblock; /* * Used inside x11fwd.c to remember recently seen * XDM-AUTHORIZATION-1 strings, to avoid replay attacks. */ tree234 *xdmseen; /* * What to do with an X connection matching this auth data. */ struct X11Display *disp; void *share_cs, *share_chan; }; void *x11_make_greeting(int endian, int protomajor, int protominor, int auth_proto, const void *auth_data, int auth_len, const char *peer_ip, int peer_port, int *outlen); int x11_authcmp(void *av, void *bv); /* for putting X11FakeAuth in a tree234 */ /* * x11_setup_display() parses the display variable and fills in an * X11Display structure. Some remote auth details are invented; * the supplied authtype parameter configures the preferred * authorisation protocol to use at the remote end. The local auth * details are looked up by calling platform_get_x11_auth. */ extern struct X11Display *x11_setup_display(const char *display, Conf *); void x11_free_display(struct X11Display *disp); struct X11FakeAuth *x11_invent_fake_auth(tree234 *t, int authtype); void x11_free_fake_auth(struct X11FakeAuth *auth); struct X11Connection; /* opaque outside x11fwd.c */ struct X11Connection *x11_init(tree234 *authtree, void *, const char *, int); extern void x11_close(struct X11Connection *); extern int x11_send(struct X11Connection *, char *, int); extern void x11_send_eof(struct X11Connection *s); extern void x11_unthrottle(struct X11Connection *s); extern void x11_override_throttle(struct X11Connection *s, int enable); char *x11_display(const char *display); /* Platform-dependent X11 functions */ extern void platform_get_x11_auth(struct X11Display *display, Conf *); /* examine a mostly-filled-in X11Display and fill in localauth* */ extern const int platform_uses_x11_unix_by_default; /* choose default X transport in the absence of a specified one */ SockAddr platform_get_x11_unix_address(const char *path, int displaynum); /* make up a SockAddr naming the address for displaynum */ char *platform_get_x_display(void); /* allocated local X display string, if any */ /* Callbacks in x11.c usable _by_ platform X11 functions */ /* * This function does the job of platform_get_x11_auth, provided * it is told where to find a normally formatted .Xauthority file: * it opens that file, parses it to find an auth record which * matches the display details in "display", and fills in the * localauth fields. * * It is expected that most implementations of * platform_get_x11_auth() will work by finding their system's * .Xauthority file, adjusting the display details if necessary * for local oddities like Unix-domain socket transport, and * calling this function to do the rest of the work. */ void x11_get_auth_from_authfile(struct X11Display *display, const char *authfilename); int x11_identify_auth_proto(const char *proto); void *x11_dehexify(const char *hex, int *outlen); Bignum copybn(Bignum b); Bignum bn_power_2(int n); void bn_restore_invariant(Bignum b); Bignum bignum_from_long(unsigned long n); void freebn(Bignum b); Bignum modpow(Bignum base, Bignum exp, Bignum mod); Bignum modmul(Bignum a, Bignum b, Bignum mod); Bignum modsub(const Bignum a, const Bignum b, const Bignum n); void decbn(Bignum n); extern Bignum Zero, One; Bignum bignum_from_bytes(const unsigned char *data, int nbytes); Bignum bignum_from_bytes_le(const unsigned char *data, int nbytes); Bignum bignum_random_in_range(const Bignum lower, const Bignum upper); int ssh1_read_bignum(const unsigned char *data, int len, Bignum * result); int bignum_bitcount(Bignum bn); int ssh1_bignum_length(Bignum bn); int ssh2_bignum_length(Bignum bn); int bignum_byte(Bignum bn, int i); int bignum_bit(Bignum bn, int i); void bignum_set_bit(Bignum bn, int i, int value); int ssh1_write_bignum(void *data, Bignum bn); Bignum biggcd(Bignum a, Bignum b); unsigned short bignum_mod_short(Bignum number, unsigned short modulus); Bignum bignum_add_long(Bignum number, unsigned long addend); Bignum bigadd(Bignum a, Bignum b); Bignum bigsub(Bignum a, Bignum b); Bignum bigmul(Bignum a, Bignum b); Bignum bigmuladd(Bignum a, Bignum b, Bignum addend); Bignum bigdiv(Bignum a, Bignum b); Bignum bigmod(Bignum a, Bignum b); Bignum modinv(Bignum number, Bignum modulus); Bignum bignum_bitmask(Bignum number); Bignum bignum_rshift(Bignum number, int shift); Bignum bignum_lshift(Bignum number, int shift); int bignum_cmp(Bignum a, Bignum b); char *bignum_decimal(Bignum x); Bignum bignum_from_decimal(const char *decimal); #ifdef DEBUG void diagbn(char *prefix, Bignum md); #endif int dh_is_gex(const struct ssh_kex *kex); void *dh_setup_group(const struct ssh_kex *kex); void *dh_setup_gex(Bignum pval, Bignum gval); void dh_cleanup(void *); Bignum dh_create_e(void *, int nbits); const char *dh_validate_f(void *handle, Bignum f); Bignum dh_find_K(void *, Bignum f); int loadrsakey(const Filename *filename, struct RSAKey *key, const char *passphrase, const char **errorstr); int rsakey_encrypted(const Filename *filename, char **comment); int rsakey_pubblob(const Filename *filename, void **blob, int *bloblen, char **commentptr, const char **errorstr); int saversakey(const Filename *filename, struct RSAKey *key, char *passphrase); extern int base64_decode_atom(const char *atom, unsigned char *out); extern int base64_lines(int datalen); extern void base64_encode_atom(const unsigned char *data, int n, char *out); extern void base64_encode(FILE *fp, const unsigned char *data, int datalen, int cpl); /* ssh2_load_userkey can return this as an error */ extern struct ssh2_userkey ssh2_wrong_passphrase; #define SSH2_WRONG_PASSPHRASE (&ssh2_wrong_passphrase) int ssh2_userkey_encrypted(const Filename *filename, char **comment); struct ssh2_userkey *ssh2_load_userkey(const Filename *filename, const char *passphrase, const char **errorstr); unsigned char *ssh2_userkey_loadpub(const Filename *filename, char **algorithm, int *pub_blob_len, char **commentptr, const char **errorstr); int ssh2_save_userkey(const Filename *filename, struct ssh2_userkey *key, char *passphrase); const struct ssh_signkey *find_pubkey_alg(const char *name); const struct ssh_signkey *find_pubkey_alg_len(int namelen, const char *name); enum { SSH_KEYTYPE_UNOPENABLE, SSH_KEYTYPE_UNKNOWN, SSH_KEYTYPE_SSH1, SSH_KEYTYPE_SSH2, /* * The OpenSSH key types deserve a little explanation. OpenSSH has * two physical formats for private key storage: an old PEM-based * one largely dictated by their use of OpenSSL and full of ASN.1, * and a new one using the same private key formats used over the * wire for talking to ssh-agent. The old format can only support * a subset of the key types, because it needs redesign for each * key type, and after a while they decided to move to the new * format so as not to have to do that. * * On input, key files are identified as either * SSH_KEYTYPE_OPENSSH_PEM or SSH_KEYTYPE_OPENSSH_NEW, describing * accurately which actual format the keys are stored in. * * On output, however, we default to following OpenSSH's own * policy of writing out PEM-style keys for maximum backwards * compatibility if the key type supports it, and otherwise * switching to the new format. So the formats you can select for * output are SSH_KEYTYPE_OPENSSH_NEW (forcing the new format for * any key type), and SSH_KEYTYPE_OPENSSH_AUTO to use the oldest * format supported by whatever key type you're writing out. * * So we have three type codes, but only two of them usable in any * given circumstance. An input key file will never be identified * as AUTO, only PEM or NEW; key export UIs should not be able to * select PEM, only AUTO or NEW. */ SSH_KEYTYPE_OPENSSH_AUTO, SSH_KEYTYPE_OPENSSH_PEM, SSH_KEYTYPE_OPENSSH_NEW, SSH_KEYTYPE_SSHCOM, /* * Public-key-only formats, which we still want to be able to read * for various purposes. */ SSH_KEYTYPE_SSH1_PUBLIC, SSH_KEYTYPE_SSH2_PUBLIC_RFC4716, SSH_KEYTYPE_SSH2_PUBLIC_OPENSSH }; char *ssh1_pubkey_str(struct RSAKey *ssh1key); void ssh1_write_pubkey(FILE *fp, struct RSAKey *ssh1key); char *ssh2_pubkey_openssh_str(struct ssh2_userkey *key); void ssh2_write_pubkey(FILE *fp, const char *comment, const void *v_pub_blob, int pub_len, int keytype); char *ssh2_fingerprint_blob(const void *blob, int bloblen); char *ssh2_fingerprint(const struct ssh_signkey *alg, void *data); int key_type(const Filename *filename); const char *key_type_to_str(int type); int import_possible(int type); int import_target_type(int type); int import_encrypted(const Filename *filename, int type, char **comment); int import_ssh1(const Filename *filename, int type, struct RSAKey *key, char *passphrase, const char **errmsg_p); struct ssh2_userkey *import_ssh2(const Filename *filename, int type, char *passphrase, const char **errmsg_p); int export_ssh1(const Filename *filename, int type, struct RSAKey *key, char *passphrase); int export_ssh2(const Filename *filename, int type, struct ssh2_userkey *key, char *passphrase); void des3_decrypt_pubkey(unsigned char *key, unsigned char *blk, int len); void des3_encrypt_pubkey(unsigned char *key, unsigned char *blk, int len); void des3_decrypt_pubkey_ossh(unsigned char *key, unsigned char *iv, unsigned char *blk, int len); void des3_encrypt_pubkey_ossh(unsigned char *key, unsigned char *iv, unsigned char *blk, int len); void aes256_encrypt_pubkey(unsigned char *key, unsigned char *blk, int len); void aes256_decrypt_pubkey(unsigned char *key, unsigned char *blk, int len); void des_encrypt_xdmauth(const unsigned char *key, unsigned char *blk, int len); void des_decrypt_xdmauth(const unsigned char *key, unsigned char *blk, int len); void openssh_bcrypt(const char *passphrase, const unsigned char *salt, int saltbytes, int rounds, unsigned char *out, int outbytes); /* * For progress updates in the key generation utility. */ #define PROGFN_INITIALISE 1 #define PROGFN_LIN_PHASE 2 #define PROGFN_EXP_PHASE 3 #define PROGFN_PHASE_EXTENT 4 #define PROGFN_READY 5 #define PROGFN_PROGRESS 6 typedef void (*progfn_t) (void *param, int action, int phase, int progress); int rsa_generate(struct RSAKey *key, int bits, progfn_t pfn, void *pfnparam); int dsa_generate(struct dss_key *key, int bits, progfn_t pfn, void *pfnparam); int ec_generate(struct ec_key *key, int bits, progfn_t pfn, void *pfnparam); int ec_edgenerate(struct ec_key *key, int bits, progfn_t pfn, void *pfnparam); Bignum primegen(int bits, int modulus, int residue, Bignum factor, int phase, progfn_t pfn, void *pfnparam, unsigned firstbits); void invent_firstbits(unsigned *one, unsigned *two); /* * zlib compression. */ void *zlib_compress_init(void); void zlib_compress_cleanup(void *); void *zlib_decompress_init(void); void zlib_decompress_cleanup(void *); int zlib_compress_block(void *, unsigned char *block, int len, unsigned char **outblock, int *outlen); int zlib_decompress_block(void *, unsigned char *block, int len, unsigned char **outblock, int *outlen); /* * Connection-sharing API provided by platforms. This function must * either: * - return SHARE_NONE and do nothing * - return SHARE_DOWNSTREAM and set *sock to a Socket connected to * downplug * - return SHARE_UPSTREAM and set *sock to a Socket connected to * upplug. */ enum { SHARE_NONE, SHARE_DOWNSTREAM, SHARE_UPSTREAM }; int platform_ssh_share(const char *name, Conf *conf, Plug downplug, Plug upplug, Socket *sock, char **logtext, char **ds_err, char **us_err, int can_upstream, int can_downstream); void platform_ssh_share_cleanup(const char *name); /* * SSH-1 message type codes. */ #define SSH1_MSG_DISCONNECT 1 /* 0x1 */ #define SSH1_SMSG_PUBLIC_KEY 2 /* 0x2 */ #define SSH1_CMSG_SESSION_KEY 3 /* 0x3 */ #define SSH1_CMSG_USER 4 /* 0x4 */ #define SSH1_CMSG_AUTH_RSA 6 /* 0x6 */ #define SSH1_SMSG_AUTH_RSA_CHALLENGE 7 /* 0x7 */ #define SSH1_CMSG_AUTH_RSA_RESPONSE 8 /* 0x8 */ #define SSH1_CMSG_AUTH_PASSWORD 9 /* 0x9 */ #define SSH1_CMSG_REQUEST_PTY 10 /* 0xa */ #define SSH1_CMSG_WINDOW_SIZE 11 /* 0xb */ #define SSH1_CMSG_EXEC_SHELL 12 /* 0xc */ #define SSH1_CMSG_EXEC_CMD 13 /* 0xd */ #define SSH1_SMSG_SUCCESS 14 /* 0xe */ #define SSH1_SMSG_FAILURE 15 /* 0xf */ #define SSH1_CMSG_STDIN_DATA 16 /* 0x10 */ #define SSH1_SMSG_STDOUT_DATA 17 /* 0x11 */ #define SSH1_SMSG_STDERR_DATA 18 /* 0x12 */ #define SSH1_CMSG_EOF 19 /* 0x13 */ #define SSH1_SMSG_EXIT_STATUS 20 /* 0x14 */ #define SSH1_MSG_CHANNEL_OPEN_CONFIRMATION 21 /* 0x15 */ #define SSH1_MSG_CHANNEL_OPEN_FAILURE 22 /* 0x16 */ #define SSH1_MSG_CHANNEL_DATA 23 /* 0x17 */ #define SSH1_MSG_CHANNEL_CLOSE 24 /* 0x18 */ #define SSH1_MSG_CHANNEL_CLOSE_CONFIRMATION 25 /* 0x19 */ #define SSH1_SMSG_X11_OPEN 27 /* 0x1b */ #define SSH1_CMSG_PORT_FORWARD_REQUEST 28 /* 0x1c */ #define SSH1_MSG_PORT_OPEN 29 /* 0x1d */ #define SSH1_CMSG_AGENT_REQUEST_FORWARDING 30 /* 0x1e */ #define SSH1_SMSG_AGENT_OPEN 31 /* 0x1f */ #define SSH1_MSG_IGNORE 32 /* 0x20 */ #define SSH1_CMSG_EXIT_CONFIRMATION 33 /* 0x21 */ #define SSH1_CMSG_X11_REQUEST_FORWARDING 34 /* 0x22 */ #define SSH1_CMSG_AUTH_RHOSTS_RSA 35 /* 0x23 */ #define SSH1_MSG_DEBUG 36 /* 0x24 */ #define SSH1_CMSG_REQUEST_COMPRESSION 37 /* 0x25 */ #define SSH1_CMSG_AUTH_TIS 39 /* 0x27 */ #define SSH1_SMSG_AUTH_TIS_CHALLENGE 40 /* 0x28 */ #define SSH1_CMSG_AUTH_TIS_RESPONSE 41 /* 0x29 */ #define SSH1_CMSG_AUTH_CCARD 70 /* 0x46 */ #define SSH1_SMSG_AUTH_CCARD_CHALLENGE 71 /* 0x47 */ #define SSH1_CMSG_AUTH_CCARD_RESPONSE 72 /* 0x48 */ #define SSH1_AUTH_RHOSTS 1 /* 0x1 */ #define SSH1_AUTH_RSA 2 /* 0x2 */ #define SSH1_AUTH_PASSWORD 3 /* 0x3 */ #define SSH1_AUTH_RHOSTS_RSA 4 /* 0x4 */ #define SSH1_AUTH_TIS 5 /* 0x5 */ #define SSH1_AUTH_CCARD 16 /* 0x10 */ #define SSH1_PROTOFLAG_SCREEN_NUMBER 1 /* 0x1 */ /* Mask for protoflags we will echo back to server if seen */ #define SSH1_PROTOFLAGS_SUPPORTED 0 /* 0x1 */ /* * SSH-2 message type codes. */ #define SSH2_MSG_DISCONNECT 1 /* 0x1 */ #define SSH2_MSG_IGNORE 2 /* 0x2 */ #define SSH2_MSG_UNIMPLEMENTED 3 /* 0x3 */ #define SSH2_MSG_DEBUG 4 /* 0x4 */ #define SSH2_MSG_SERVICE_REQUEST 5 /* 0x5 */ #define SSH2_MSG_SERVICE_ACCEPT 6 /* 0x6 */ #define SSH2_MSG_KEXINIT 20 /* 0x14 */ #define SSH2_MSG_NEWKEYS 21 /* 0x15 */ #define SSH2_MSG_KEXDH_INIT 30 /* 0x1e */ #define SSH2_MSG_KEXDH_REPLY 31 /* 0x1f */ #define SSH2_MSG_KEX_DH_GEX_REQUEST_OLD 30 /* 0x1e */ #define SSH2_MSG_KEX_DH_GEX_REQUEST 34 /* 0x22 */ #define SSH2_MSG_KEX_DH_GEX_GROUP 31 /* 0x1f */ #define SSH2_MSG_KEX_DH_GEX_INIT 32 /* 0x20 */ #define SSH2_MSG_KEX_DH_GEX_REPLY 33 /* 0x21 */ #define SSH2_MSG_KEXRSA_PUBKEY 30 /* 0x1e */ #define SSH2_MSG_KEXRSA_SECRET 31 /* 0x1f */ #define SSH2_MSG_KEXRSA_DONE 32 /* 0x20 */ #define SSH2_MSG_KEX_ECDH_INIT 30 /* 0x1e */ #define SSH2_MSG_KEX_ECDH_REPLY 31 /* 0x1f */ #define SSH2_MSG_KEX_ECMQV_INIT 30 /* 0x1e */ #define SSH2_MSG_KEX_ECMQV_REPLY 31 /* 0x1f */ #define SSH2_MSG_USERAUTH_REQUEST 50 /* 0x32 */ #define SSH2_MSG_USERAUTH_FAILURE 51 /* 0x33 */ #define SSH2_MSG_USERAUTH_SUCCESS 52 /* 0x34 */ #define SSH2_MSG_USERAUTH_BANNER 53 /* 0x35 */ #define SSH2_MSG_USERAUTH_PK_OK 60 /* 0x3c */ #define SSH2_MSG_USERAUTH_PASSWD_CHANGEREQ 60 /* 0x3c */ #define SSH2_MSG_USERAUTH_INFO_REQUEST 60 /* 0x3c */ #define SSH2_MSG_USERAUTH_INFO_RESPONSE 61 /* 0x3d */ #define SSH2_MSG_GLOBAL_REQUEST 80 /* 0x50 */ #define SSH2_MSG_REQUEST_SUCCESS 81 /* 0x51 */ #define SSH2_MSG_REQUEST_FAILURE 82 /* 0x52 */ #define SSH2_MSG_CHANNEL_OPEN 90 /* 0x5a */ #define SSH2_MSG_CHANNEL_OPEN_CONFIRMATION 91 /* 0x5b */ #define SSH2_MSG_CHANNEL_OPEN_FAILURE 92 /* 0x5c */ #define SSH2_MSG_CHANNEL_WINDOW_ADJUST 93 /* 0x5d */ #define SSH2_MSG_CHANNEL_DATA 94 /* 0x5e */ #define SSH2_MSG_CHANNEL_EXTENDED_DATA 95 /* 0x5f */ #define SSH2_MSG_CHANNEL_EOF 96 /* 0x60 */ #define SSH2_MSG_CHANNEL_CLOSE 97 /* 0x61 */ #define SSH2_MSG_CHANNEL_REQUEST 98 /* 0x62 */ #define SSH2_MSG_CHANNEL_SUCCESS 99 /* 0x63 */ #define SSH2_MSG_CHANNEL_FAILURE 100 /* 0x64 */ #define SSH2_MSG_USERAUTH_GSSAPI_RESPONSE 60 #define SSH2_MSG_USERAUTH_GSSAPI_TOKEN 61 #define SSH2_MSG_USERAUTH_GSSAPI_EXCHANGE_COMPLETE 63 #define SSH2_MSG_USERAUTH_GSSAPI_ERROR 64 #define SSH2_MSG_USERAUTH_GSSAPI_ERRTOK 65 #define SSH2_MSG_USERAUTH_GSSAPI_MIC 66 /* * SSH-1 agent messages. */ #define SSH1_AGENTC_REQUEST_RSA_IDENTITIES 1 #define SSH1_AGENT_RSA_IDENTITIES_ANSWER 2 #define SSH1_AGENTC_RSA_CHALLENGE 3 #define SSH1_AGENT_RSA_RESPONSE 4 #define SSH1_AGENTC_ADD_RSA_IDENTITY 7 #define SSH1_AGENTC_REMOVE_RSA_IDENTITY 8 #define SSH1_AGENTC_REMOVE_ALL_RSA_IDENTITIES 9 /* openssh private? */ /* * Messages common to SSH-1 and OpenSSH's SSH-2. */ #define SSH_AGENT_FAILURE 5 #define SSH_AGENT_SUCCESS 6 /* * OpenSSH's SSH-2 agent messages. */ #define SSH2_AGENTC_REQUEST_IDENTITIES 11 #define SSH2_AGENT_IDENTITIES_ANSWER 12 #define SSH2_AGENTC_SIGN_REQUEST 13 #define SSH2_AGENT_SIGN_RESPONSE 14 #define SSH2_AGENTC_ADD_IDENTITY 17 #define SSH2_AGENTC_REMOVE_IDENTITY 18 #define SSH2_AGENTC_REMOVE_ALL_IDENTITIES 19 /* * Assorted other SSH-related enumerations. */ #define SSH2_DISCONNECT_HOST_NOT_ALLOWED_TO_CONNECT 1 /* 0x1 */ #define SSH2_DISCONNECT_PROTOCOL_ERROR 2 /* 0x2 */ #define SSH2_DISCONNECT_KEY_EXCHANGE_FAILED 3 /* 0x3 */ #define SSH2_DISCONNECT_HOST_AUTHENTICATION_FAILED 4 /* 0x4 */ #define SSH2_DISCONNECT_MAC_ERROR 5 /* 0x5 */ #define SSH2_DISCONNECT_COMPRESSION_ERROR 6 /* 0x6 */ #define SSH2_DISCONNECT_SERVICE_NOT_AVAILABLE 7 /* 0x7 */ #define SSH2_DISCONNECT_PROTOCOL_VERSION_NOT_SUPPORTED 8 /* 0x8 */ #define SSH2_DISCONNECT_HOST_KEY_NOT_VERIFIABLE 9 /* 0x9 */ #define SSH2_DISCONNECT_CONNECTION_LOST 10 /* 0xa */ #define SSH2_DISCONNECT_BY_APPLICATION 11 /* 0xb */ #define SSH2_DISCONNECT_TOO_MANY_CONNECTIONS 12 /* 0xc */ #define SSH2_DISCONNECT_AUTH_CANCELLED_BY_USER 13 /* 0xd */ #define SSH2_DISCONNECT_NO_MORE_AUTH_METHODS_AVAILABLE 14 /* 0xe */ #define SSH2_DISCONNECT_ILLEGAL_USER_NAME 15 /* 0xf */ #define SSH2_OPEN_ADMINISTRATIVELY_PROHIBITED 1 /* 0x1 */ #define SSH2_OPEN_CONNECT_FAILED 2 /* 0x2 */ #define SSH2_OPEN_UNKNOWN_CHANNEL_TYPE 3 /* 0x3 */ #define SSH2_OPEN_RESOURCE_SHORTAGE 4 /* 0x4 */ #define SSH2_EXTENDED_DATA_STDERR 1 /* 0x1 */ /* * Need this to warn about support for the original SSH-2 keyfile * format. */ void old_keyfile_warning(void);