X-Git-Url: https://asedeno.scripts.mit.edu/gitweb/?a=blobdiff_plain;f=psftp.c;h=08c89e74f0df3f22dbaf76e2a8723ec54e3236e8;hb=39cf689fd6931173197234fedef5ffc389b4e4e0;hp=50be458227d98296b1816ddad2768d5fe1dcf7d5;hpb=094dd30d957b0ad07181d4270b1c8243bf38e289;p=PuTTY.git diff --git a/psftp.c b/psftp.c index 50be4582..08c89e74 100644 --- a/psftp.c +++ b/psftp.c @@ -2,18 +2,20 @@ * psftp.c: front end for PSFTP. */ +#include + #include #include #include #include +#define PUTTY_DO_GLOBALS +#include "putty.h" +#include "storage.h" +#include "ssh.h" #include "sftp.h" #include "int64.h" -#define smalloc malloc -#define srealloc realloc -#define sfree free - /* ---------------------------------------------------------------------- * String handling routines. */ @@ -75,12 +77,20 @@ char *pwd, *homedir; */ char *canonify(char *name) { char *fullname, *canonname; + if (name[0] == '/') { fullname = dupstr(name); } else { - fullname = dupcat(pwd, "/", name, NULL); + char *slash; + if (pwd[strlen(pwd)-1] == '/') + slash = ""; + else + slash = "/"; + fullname = dupcat(pwd, slash, name, NULL); } - canonname = fxp_realpath(name); + + canonname = fxp_realpath(fullname); + if (canonname) { sfree(fullname); return canonname; @@ -383,6 +393,7 @@ static struct sftp_cmd_lookup { */ {"bye", sftp_cmd_quit}, {"cd", sftp_cmd_cd}, + {"dir", sftp_cmd_ls}, {"exit", sftp_cmd_quit}, {"get", sftp_cmd_get}, {"ls", sftp_cmd_ls}, @@ -539,15 +550,448 @@ void do_sftp(void) { if (cmd->obey(cmd) < 0) break; } +} - /* ------------------------------------------------------------------ - * We've received an exit command. Tidy up and leave. +/* ---------------------------------------------------------------------- + * Dirty bits: integration with PuTTY. + */ + +static int verbose = 0; + +void verify_ssh_host_key(char *host, int port, char *keytype, + char *keystr, char *fingerprint) { + int ret; + + static const char absentmsg[] = + "The server's host key is not cached in the registry. You\n" + "have no guarantee that the server is the computer you\n" + "think it is.\n" + "The server's key fingerprint is:\n" + "%s\n" + "If you trust this host, enter \"y\" to add the key to\n" + "PuTTY's cache and carry on connecting.\n" + "If you do not trust this host, enter \"n\" to abandon the\n" + "connection.\n" + "Continue connecting? (y/n) "; + + static const char wrongmsg[] = + "WARNING - POTENTIAL SECURITY BREACH!\n" + "The server's host key does not match the one PuTTY has\n" + "cached in the registry. This means that either the\n" + "server administrator has changed the host key, or you\n" + "have actually connected to another computer pretending\n" + "to be the server.\n" + "The new key fingerprint is:\n" + "%s\n" + "If you were expecting this change and trust the new key,\n" + "enter Yes to update PuTTY's cache and continue connecting.\n" + "If you want to carry on connecting but without updating\n" + "the cache, enter No.\n" + "If you want to abandon the connection completely, press\n" + "Return to cancel. Pressing Return is the ONLY guaranteed\n" + "safe choice.\n" + "Update cached key? (y/n, Return cancels connection) "; + + static const char abandoned[] = "Connection abandoned.\n"; + + char line[32]; + + /* + * Verify the key against the registry. + */ + ret = verify_host_key(host, port, keytype, keystr); + + if (ret == 0) /* success - key matched OK */ + return; + if (ret == 2) { /* key was different */ + fprintf(stderr, wrongmsg, fingerprint); + if (fgets(line, sizeof(line), stdin) && + line[0] != '\0' && line[0] != '\n') { + if (line[0] == 'y' || line[0] == 'Y') + store_host_key(host, port, keytype, keystr); + } else { + fprintf(stderr, abandoned); + exit(0); + } + } + if (ret == 1) { /* key was absent */ + fprintf(stderr, absentmsg, fingerprint); + if (fgets(line, sizeof(line), stdin) && + (line[0] == 'y' || line[0] == 'Y')) + store_host_key(host, port, keytype, keystr); + else { + fprintf(stderr, abandoned); + exit(0); + } + } +} + +/* + * Print an error message and perform a fatal exit. + */ +void fatalbox(char *fmt, ...) +{ + char str[0x100]; /* Make the size big enough */ + va_list ap; + va_start(ap, fmt); + strcpy(str, "Fatal:"); + vsprintf(str+strlen(str), fmt, ap); + va_end(ap); + strcat(str, "\n"); + fprintf(stderr, str); + + exit(1); +} +void connection_fatal(char *fmt, ...) +{ + char str[0x100]; /* Make the size big enough */ + va_list ap; + va_start(ap, fmt); + strcpy(str, "Fatal:"); + vsprintf(str+strlen(str), fmt, ap); + va_end(ap); + strcat(str, "\n"); + fprintf(stderr, str); + + exit(1); +} + +void logevent(char *string) { } + +void ldisc_send(char *buf, int len) { + /* + * This is only here because of the calls to ldisc_send(NULL, + * 0) in ssh.c. Nothing in PSFTP actually needs to use the + * ldisc as an ldisc. So if we get called with any real data, I + * want to know about it. */ - io_finish(); + assert(len == 0); +} + +/* + * Be told what socket we're supposed to be using. + */ +static SOCKET sftp_ssh_socket; +char *do_select(SOCKET skt, int startup) { + if (startup) + sftp_ssh_socket = skt; + else + sftp_ssh_socket = INVALID_SOCKET; + return NULL; } +extern int select_result(WPARAM, LPARAM); + +/* + * Receive a block of data from the SSH link. Block until all data + * is available. + * + * To do this, we repeatedly call the SSH protocol module, with our + * own trap in from_backend() to catch the data that comes back. We + * do this until we have enough data. + */ + +static unsigned char *outptr; /* where to put the data */ +static unsigned outlen; /* how much data required */ +static unsigned char *pending = NULL; /* any spare data */ +static unsigned pendlen=0, pendsize=0; /* length and phys. size of buffer */ +void from_backend(int is_stderr, char *data, int datalen) { + unsigned char *p = (unsigned char *)data; + unsigned len = (unsigned)datalen; + + /* + * stderr data is just spouted to local stderr and otherwise + * ignored. + */ + if (is_stderr) { + fwrite(data, 1, len, stderr); + return; + } + + /* + * If this is before the real session begins, just return. + */ + if (!outptr) + return; + + if (outlen > 0) { + unsigned used = outlen; + if (used > len) used = len; + memcpy(outptr, p, used); + outptr += used; outlen -= used; + p += used; len -= used; + } + + if (len > 0) { + if (pendsize < pendlen + len) { + pendsize = pendlen + len + 4096; + pending = (pending ? srealloc(pending, pendsize) : + smalloc(pendsize)); + if (!pending) + fatalbox("Out of memory"); + } + memcpy(pending+pendlen, p, len); + pendlen += len; + } +} +int sftp_recvdata(char *buf, int len) { + outptr = (unsigned char *)buf; + outlen = len; + + /* + * See if the pending-input block contains some of what we + * need. + */ + if (pendlen > 0) { + unsigned pendused = pendlen; + if (pendused > outlen) + pendused = outlen; + memcpy(outptr, pending, pendused); + memmove(pending, pending+pendused, pendlen-pendused); + outptr += pendused; + outlen -= pendused; + pendlen -= pendused; + if (pendlen == 0) { + pendsize = 0; + sfree(pending); + pending = NULL; + } + if (outlen == 0) + return 1; + } + + while (outlen > 0) { + fd_set readfds; + + FD_ZERO(&readfds); + FD_SET(sftp_ssh_socket, &readfds); + if (select(1, &readfds, NULL, NULL, NULL) < 0) + return 0; /* doom */ + select_result((WPARAM)sftp_ssh_socket, (LPARAM)FD_READ); + } + + return 1; +} +int sftp_senddata(char *buf, int len) { + back->send((unsigned char *)buf, len); + return 1; +} + +/* + * Loop through the ssh connection and authentication process. + */ +static void ssh_sftp_init(void) { + if (sftp_ssh_socket == INVALID_SOCKET) + return; + while (!back->sendok()) { + fd_set readfds; + FD_ZERO(&readfds); + FD_SET(sftp_ssh_socket, &readfds); + if (select(1, &readfds, NULL, NULL, NULL) < 0) + return; /* doom */ + select_result((WPARAM)sftp_ssh_socket, (LPARAM)FD_READ); + } +} + +static char *password = NULL; +static int get_password(const char *prompt, char *str, int maxlen) +{ + HANDLE hin, hout; + DWORD savemode, i; + + if (password) { + static int tried_once = 0; + + if (tried_once) { + return 0; + } else { + strncpy(str, password, maxlen); + str[maxlen-1] = '\0'; + tried_once = 1; + return 1; + } + } + + hin = GetStdHandle(STD_INPUT_HANDLE); + hout = GetStdHandle(STD_OUTPUT_HANDLE); + if (hin == INVALID_HANDLE_VALUE || hout == INVALID_HANDLE_VALUE) { + fprintf(stderr, "Cannot get standard input/output handles\n"); + exit(1); + } + + GetConsoleMode(hin, &savemode); + SetConsoleMode(hin, (savemode & (~ENABLE_ECHO_INPUT)) | + ENABLE_PROCESSED_INPUT | ENABLE_LINE_INPUT); + + WriteFile(hout, prompt, strlen(prompt), &i, NULL); + ReadFile(hin, str, maxlen-1, &i, NULL); + + SetConsoleMode(hin, savemode); + + if ((int)i > maxlen) i = maxlen-1; else i = i - 2; + str[i] = '\0'; + + WriteFile(hout, "\r\n", 2, &i, NULL); + + return 1; +} + +/* + * Initialize the Win$ock driver. + */ +static void init_winsock(void) +{ + WORD winsock_ver; + WSADATA wsadata; + + winsock_ver = MAKEWORD(1, 1); + if (WSAStartup(winsock_ver, &wsadata)) { + fprintf(stderr, "Unable to initialise WinSock"); + exit(1); + } + if (LOBYTE(wsadata.wVersion) != 1 || + HIBYTE(wsadata.wVersion) != 1) { + fprintf(stderr, "WinSock version is incompatible with 1.1"); + exit(1); + } +} + +/* + * Short description of parameters. + */ +static void usage(void) +{ + printf("PuTTY Secure File Transfer (SFTP) client\n"); + printf("%s\n", ver); + printf("Usage: psftp [options] user@host\n"); + printf("Options:\n"); + printf(" -v show verbose messages\n"); + printf(" -P port connect to specified port\n"); + printf(" -pw passw login with specified password\n"); + exit(1); +} + +/* + * Main program. Parse arguments etc. + */ +int main(int argc, char *argv[]) +{ + int i; + int portnumber = 0; + char *user, *host, *userhost, *realhost; + char *err; + + flags = FLAG_STDERR; + ssh_get_password = &get_password; + init_winsock(); + sk_init(); + + userhost = user = NULL; + + for (i = 1; i < argc; i++) { + if (argv[i][0] != '-') { + if (userhost) + usage(); + else + userhost = dupstr(argv[i]); + } else if (strcmp(argv[i], "-v") == 0) { + verbose = 1, flags |= FLAG_VERBOSE; + } else if (strcmp(argv[i], "-h") == 0 || + strcmp(argv[i], "-?") == 0) { + usage(); + } else if (strcmp(argv[i], "-l") == 0 && i+1 < argc) { + user = argv[++i]; + } else if (strcmp(argv[i], "-P") == 0 && i+1 < argc) { + portnumber = atoi(argv[++i]); + } else if (strcmp(argv[i], "-pw") == 0 && i+1 < argc) { + password = argv[++i]; + } else if (strcmp(argv[i], "--") == 0) { + i++; + break; + } else { + usage(); + } + } + argc -= i; + argv += i; + back = NULL; + + if (argc > 0 || !userhost) + usage(); + + /* Separate host and username */ + host = userhost; + host = strrchr(host, '@'); + if (host == NULL) { + host = userhost; + } else { + *host++ = '\0'; + if (user) { + printf("psftp: multiple usernames specified; using \"%s\"\n", user); + } else + user = userhost; + } + + /* Try to load settings for this host */ + do_defaults(host, &cfg); + if (cfg.host[0] == '\0') { + /* No settings for this host; use defaults */ + do_defaults(NULL, &cfg); + strncpy(cfg.host, host, sizeof(cfg.host)-1); + cfg.host[sizeof(cfg.host)-1] = '\0'; + cfg.port = 22; + } + + /* Set username */ + if (user != NULL && user[0] != '\0') { + strncpy(cfg.username, user, sizeof(cfg.username)-1); + cfg.username[sizeof(cfg.username)-1] = '\0'; + } + if (!cfg.username[0]) { + printf("login as: "); + if (!fgets(cfg.username, sizeof(cfg.username), stdin)) { + fprintf(stderr, "psftp: aborting\n"); + exit(1); + } else { + int len = strlen(cfg.username); + if (cfg.username[len-1] == '\n') + cfg.username[len-1] = '\0'; + } + } + + if (cfg.protocol != PROT_SSH) + cfg.port = 22; + + if (portnumber) + cfg.port = portnumber; + + /* SFTP uses SSH2 by default always */ + cfg.sshprot = 2; + + /* Set up subsystem name. FIXME: fudge for SSH1. */ + strcpy(cfg.remote_cmd, "sftp"); + cfg.ssh_subsys = TRUE; + cfg.nopty = TRUE; + + back = &ssh_backend; + + err = back->init(cfg.host, cfg.port, &realhost); + if (err != NULL) { + fprintf(stderr, "ssh_init: %s", err); + return 1; + } + ssh_sftp_init(); + if (verbose && realhost != NULL) + printf("Connected to %s\n", realhost); -int main(void) { - io_init(); do_sftp(); + + if (back != NULL && back->socket() != NULL) { + char ch; + back->special(TS_EOF); + sftp_recvdata(&ch, 1); + } + WSACleanup(); + random_save_seed(); + return 0; }