#include <stdio.h> #include <string.h> #include "puttymem.h" #include "tree234.h" #include "network.h" #include "int64.h" #include "misc.h" struct ssh_channel; extern void sshfwd_close(struct ssh_channel *c); extern int sshfwd_write(struct ssh_channel *c, char *, int); extern void sshfwd_unthrottle(struct ssh_channel *c, int bufsize); /* * 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; }; int makekey(unsigned char *data, int len, struct RSAKey *result, unsigned char **keystr, int order); int makeprivate(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); 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, void *p, int len); void SHA_Final(SHA_State * s, unsigned char *output); void SHA_Simple(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; 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); 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; 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); char *name; int blksize; int keylen; unsigned int flags; #define SSH_CIPHER_IS_CBC 1 char *text_name; }; struct ssh2_ciphers { int nciphers; const struct ssh2_cipher *const *list; }; struct ssh_mac { 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 *); char *name; int len; char *text_name; }; struct ssh_hash { void *(*init)(void); /* also allocates context */ void (*bytes)(void *, void *, int); void (*final)(void *, unsigned char *); /* also frees context */ int hlen; /* output length in bytes */ char *text_name; }; struct ssh_kex { char *name, *groupname; enum { KEXTYPE_DH, KEXTYPE_RSA } main_type; /* For DH */ const unsigned char *pdata, *gdata; /* NULL means group exchange */ int plen, glen; const struct ssh_hash *hash; }; struct ssh_kexes { int nkexes; const struct ssh_kex *const *list; }; struct ssh_signkey { void *(*newkey) (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) (unsigned char *pub_blob, int pub_len, unsigned char *priv_blob, int priv_len); void *(*openssh_createkey) (unsigned char **blob, int *len); int (*openssh_fmtkey) (void *key, unsigned char *blob, int len); int (*pubkey_bits) (void *blob, int len); char *(*fingerprint) (void *key); int (*verifysig) (void *key, char *sig, int siglen, char *data, int datalen); unsigned char *(*sign) (void *key, char *data, int datalen, int *siglen); char *name; char *keytype; /* for host key cache */ }; struct ssh_compress { char *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 *); 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 (32) /* SHA-256 */ 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 ssh_hash ssh_sha1; extern const struct ssh_hash ssh_sha256; 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_signkey ssh_dss; extern const struct ssh_signkey ssh_rsa; 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; 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 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 *); /* Allocate and register a new channel for port forwarding */ void *new_sock_channel(void *handle, Socket s); void ssh_send_port_open(void *channel, char *hostname, int port, char *org); /* Exports from portfwd.c */ extern const char *pfd_newconnect(Socket * s, char *hostname, int port, void *c, const Config *cfg, int addressfamily); /* desthost == NULL indicates dynamic (SOCKS) port forwarding */ extern const char *pfd_addforward(char *desthost, int destport, char *srcaddr, int port, void *backhandle, const Config *cfg, void **sockdata, int address_family); extern void pfd_close(Socket s); extern void pfd_terminate(void *sockdata); extern int pfd_send(Socket s, char *data, int len); extern void pfd_confirm(Socket s); extern void pfd_unthrottle(Socket s); extern void pfd_override_throttle(Socket s, int enable); /* 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; /* Auth details we invented for the virtual display on the SSH server. */ int remoteauthproto; unsigned char *remoteauthdata; int remoteauthdatalen; char *remoteauthprotoname; char *remoteauthdatastring; /* Our local auth details for talking to the real X display. */ int localauthproto; unsigned char *localauthdata; int localauthdatalen; /* * Used inside x11fwd.c to remember recently seen * XDM-AUTHORIZATION-1 strings, to avoid replay attacks. */ tree234 *xdmseen; }; /* * 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(char *display, int authtype, const Config *); void x11_free_display(struct X11Display *disp); extern const char *x11_init(Socket *, struct X11Display *, void *, const char *, int, const Config *); extern void x11_close(Socket); extern int x11_send(Socket, char *, int); extern void x11_unthrottle(Socket s); extern void x11_override_throttle(Socket s, int enable); char *x11_display(const char *display); /* Platform-dependent X11 functions */ extern void platform_get_x11_auth(struct X11Display *display, const Config *); /* 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); 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); void decbn(Bignum n); extern Bignum Zero, One; Bignum bignum_from_bytes(const unsigned char *data, int nbytes); 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 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); int bignum_cmp(Bignum a, Bignum b); char *bignum_decimal(Bignum x); #ifdef DEBUG void diagbn(char *prefix, Bignum md); #endif 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); Bignum dh_find_K(void *, Bignum f); int loadrsakey(const Filename *filename, struct RSAKey *key, 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(char *atom, unsigned char *out); extern int base64_lines(int datalen); extern void base64_encode_atom(unsigned char *data, int n, char *out); extern void base64_encode(FILE *fp, 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, 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); enum { SSH_KEYTYPE_UNOPENABLE, SSH_KEYTYPE_UNKNOWN, SSH_KEYTYPE_SSH1, SSH_KEYTYPE_SSH2, SSH_KEYTYPE_OPENSSH, SSH_KEYTYPE_SSHCOM }; int key_type(const Filename *filename); 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(unsigned char *key, unsigned char *blk, int len); void des_decrypt_xdmauth(unsigned char *key, unsigned char *blk, int len); /* * 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); Bignum primegen(int bits, int modulus, int residue, Bignum factor, int phase, progfn_t pfn, void *pfnparam); /* * 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); /* * 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 /* * Need this to warn about support for the original SSH-2 keyfile * format. */ void old_keyfile_warning(void);