packetstorm sync

1 files changed, 646 insertions, 0 deletions

diff --git a/other/ssharp/ssh-keyscan.c b/other/ssharp/ssh-keyscan.c
new file mode 100644
index 0000000..3f6c231
--- /dev/null
+++ b/other/ssharp/ssh-keyscan.c
@@ -0,0 +1,646 @@
+/*
+ * Copyright 1995, 1996 by David Mazieres <dm@lcs.mit.edu>.
+ *
+ * Modification and redistribution in source and binary forms is
+ * permitted provided that due credit is given to the author and the
+ * OpenBSD project (for instance by leaving this copyright notice
+ * intact).
+ */
+
+#include "includes.h"
+RCSID("$OpenBSD: ssh-keyscan.c,v 1.22 2001/03/06 06:11:18 deraadt Exp $");
+
+#if defined(HAVE_SYS_QUEUE_H) && !defined(HAVE_BOGUS_SYS_QUEUE_H)
+#include <sys/queue.h>
+#else
+#include "openbsd-compat/fake-queue.h"
+#endif
+#include <errno.h>
+
+#include <openssl/bn.h>
+
+#include "xmalloc.h"
+#include "ssh.h"
+#include "ssh1.h"
+#include "key.h"
+#include "buffer.h"
+#include "bufaux.h"
+#include "log.h"
+#include "atomicio.h"
+
+static int argno = 1;           /* Number of argument currently being parsed */
+
+int family = AF_UNSPEC;         /* IPv4, IPv6 or both */
+
+#define MAXMAXFD 256
+
+/* The number of seconds after which to give up on a TCP connection */
+int timeout = 5;
+
+int maxfd;
+#define MAXCON (maxfd - 10)
+
+#ifdef HAVE___PROGNAME
+extern char *__progname;
+#else
+char *__progname;
+#endif
+fd_set *read_wait;
+size_t read_wait_size;
+int ncon;
+
+/*
+ * Keep a connection structure for each file descriptor.  The state
+ * associated with file descriptor n is held in fdcon[n].
+ */
+typedef struct Connection {
+        u_char c_status;        /* State of connection on this file desc. */
+#define CS_UNUSED 0             /* File descriptor unused */
+#define CS_CON 1                /* Waiting to connect/read greeting */
+#define CS_SIZE 2               /* Waiting to read initial packet size */
+#define CS_KEYS 3               /* Waiting to read public key packet */
+        int c_fd;               /* Quick lookup: c->c_fd == c - fdcon */
+        int c_plen;             /* Packet length field for ssh packet */
+        int c_len;              /* Total bytes which must be read. */
+        int c_off;              /* Length of data read so far. */
+        char *c_namebase;       /* Address to free for c_name and c_namelist */
+        char *c_name;           /* Hostname of connection for errors */
+        char *c_namelist;       /* Pointer to other possible addresses */
+        char *c_output_name;    /* Hostname of connection for output */
+        char *c_data;           /* Data read from this fd */
+        struct timeval c_tv;    /* Time at which connection gets aborted */
+        TAILQ_ENTRY(Connection) c_link; /* List of connections in timeout order. */
+} con;
+
+TAILQ_HEAD(conlist, Connection) tq;     /* Timeout Queue */
+con *fdcon;
+
+/*
+ *  This is just a wrapper around fgets() to make it usable.
+ */
+
+/* Stress-test.  Increase this later. */
+#define LINEBUF_SIZE 16
+
+typedef struct {
+        char *buf;
+        u_int size;
+        int lineno;
+        const char *filename;
+        FILE *stream;
+        void (*errfun) (const char *,...);
+} Linebuf;
+
+Linebuf *
+Linebuf_alloc(const char *filename, void (*errfun) (const char *,...))
+{
+        Linebuf *lb;
+
+        if (!(lb = malloc(sizeof(*lb)))) {
+                if (errfun)
+                        (*errfun) ("linebuf (%s): malloc failed\n", lb->filename);
+                return (NULL);
+        }
+        if (filename) {
+                lb->filename = filename;
+                if (!(lb->stream = fopen(filename, "r"))) {
+                        xfree(lb);
+                        if (errfun)
+                                (*errfun) ("%s: %s\n", filename, strerror(errno));
+                        return (NULL);
+                }
+        } else {
+                lb->filename = "(stdin)";
+                lb->stream = stdin;
+        }
+
+        if (!(lb->buf = malloc(lb->size = LINEBUF_SIZE))) {
+                if (errfun)
+                        (*errfun) ("linebuf (%s): malloc failed\n", lb->filename);
+                xfree(lb);
+                return (NULL);
+        }
+        lb->errfun = errfun;
+        lb->lineno = 0;
+        return (lb);
+}
+
+void
+Linebuf_free(Linebuf * lb)
+{
+        fclose(lb->stream);
+        xfree(lb->buf);
+        xfree(lb);
+}
+
+void
+Linebuf_restart(Linebuf * lb)
+{
+        clearerr(lb->stream);
+        rewind(lb->stream);
+        lb->lineno = 0;
+}
+
+int
+Linebuf_lineno(Linebuf * lb)
+{
+        return (lb->lineno);
+}
+
+char *
+Linebuf_getline(Linebuf * lb)
+{
+        int n = 0;
+
+        lb->lineno++;
+        for (;;) {
+                /* Read a line */
+                if (!fgets(&lb->buf[n], lb->size - n, lb->stream)) {
+                        if (ferror(lb->stream) && lb->errfun)
+                                (*lb->errfun) ("%s: %s\n", lb->filename,
+                                    strerror(errno));
+                        return (NULL);
+                }
+                n = strlen(lb->buf);
+
+                /* Return it or an error if it fits */
+                if (n > 0 && lb->buf[n - 1] == '\n') {
+                        lb->buf[n - 1] = '\0';
+                        return (lb->buf);
+                }
+                if (n != lb->size - 1) {
+                        if (lb->errfun)
+                                (*lb->errfun) ("%s: skipping incomplete last line\n",
+                                    lb->filename);
+                        return (NULL);
+                }
+                /* Double the buffer if we need more space */
+                if (!(lb->buf = realloc(lb->buf, (lb->size *= 2)))) {
+                        if (lb->errfun)
+                                (*lb->errfun) ("linebuf (%s): realloc failed\n",
+                                    lb->filename);
+                        return (NULL);
+                }
+        }
+}
+
+int
+fdlim_get(int hard)
+{
+#if defined(HAVE_GETRLIMIT) && defined(RLIMIT_NOFILE)
+        struct rlimit rlfd;
+
+        if (getrlimit(RLIMIT_NOFILE, &rlfd) < 0)
+                return (-1);
+        if ((hard ? rlfd.rlim_max : rlfd.rlim_cur) == RLIM_INFINITY)
+                return 10000;
+        else
+                return hard ? rlfd.rlim_max : rlfd.rlim_cur;
+#elif defined (HAVE_SYSCONF)
+        return sysconf (_SC_OPEN_MAX);
+#else
+        return 10000;
+#endif
+}
+
+int
+fdlim_set(int lim)
+{
+#if defined(HAVE_SETRLIMIT) && defined(RLIMIT_NOFILE)
+        struct rlimit rlfd;
+#endif
+        if (lim <= 0)
+                return (-1);
+#if defined(HAVE_SETRLIMIT) && defined(RLIMIT_NOFILE)
+        if (getrlimit(RLIMIT_NOFILE, &rlfd) < 0)
+                return (-1);
+        rlfd.rlim_cur = lim;
+        if (setrlimit(RLIMIT_NOFILE, &rlfd) < 0)
+                return (-1);
+#elif defined (HAVE_SETDTABLESIZE)
+        setdtablesize(lim);
+#endif
+        return (0);
+}
+
+/*
+ * This is an strsep function that returns a null field for adjacent
+ * separators.  This is the same as the 4.4BSD strsep, but different from the
+ * one in the GNU libc.
+ */
+char *
+xstrsep(char **str, const char *delim)
+{
+        char *s, *e;
+
+        if (!**str)
+                return (NULL);
+
+        s = *str;
+        e = s + strcspn(s, delim);
+
+        if (*e != '\0')
+                *e++ = '\0';
+        *str = e;
+
+        return (s);
+}
+
+/*
+ * Get the next non-null token (like GNU strsep).  Strsep() will return a
+ * null token for two adjacent separators, so we may have to loop.
+ */
+char *
+strnnsep(char **stringp, char *delim)
+{
+        char *tok;
+
+        do {
+                tok = xstrsep(stringp, delim);
+        } while (tok && *tok == '\0');
+        return (tok);
+}
+
+void
+keyprint(char *host, char *output_name, char *kd, int len)
+{
+        static Key *rsa;
+        static Buffer msg;
+
+        if (rsa == NULL) {
+                buffer_init(&msg);
+                rsa = key_new(KEY_RSA1);
+        }
+        buffer_append(&msg, kd, len);
+        buffer_consume(&msg, 8 - (len & 7));    /* padding */
+        if (buffer_get_char(&msg) != (int) SSH_SMSG_PUBLIC_KEY) {
+                error("%s: invalid packet type", host);
+                buffer_clear(&msg);
+                return;
+        }
+        buffer_consume(&msg, 8);                /* cookie */
+
+        /* server key */
+        (void) buffer_get_int(&msg);
+        buffer_get_bignum(&msg, rsa->rsa->e);
+        buffer_get_bignum(&msg, rsa->rsa->n);
+
+        /* host key */
+        (void) buffer_get_int(&msg);
+        buffer_get_bignum(&msg, rsa->rsa->e);
+        buffer_get_bignum(&msg, rsa->rsa->n);
+        buffer_clear(&msg);
+
+        fprintf(stdout, "%s ", output_name ? output_name : host);
+        key_write(rsa, stdout);
+        fputs("\n", stdout);
+}
+
+int
+tcpconnect(char *host)
+{
+        struct addrinfo hints, *ai, *aitop;
+        char strport[NI_MAXSERV];
+        int gaierr, s = -1;
+
+        snprintf(strport, sizeof strport, "%d", SSH_DEFAULT_PORT);
+        memset(&hints, 0, sizeof(hints));
+        hints.ai_family = family;
+        hints.ai_socktype = SOCK_STREAM;
+        if ((gaierr = getaddrinfo(host, strport, &hints, &aitop)) != 0)
+                fatal("getaddrinfo %s: %s", host, gai_strerror(gaierr));
+        for (ai = aitop; ai; ai = ai->ai_next) {
+                s = socket(ai->ai_family, SOCK_STREAM, 0);
+                if (s < 0) {
+                        error("socket: %s", strerror(errno));
+                        continue;
+                }
+                if (fcntl(s, F_SETFL, O_NONBLOCK) < 0)
+                        fatal("F_SETFL: %s", strerror(errno));
+                if (connect(s, ai->ai_addr, ai->ai_addrlen) < 0 &&
+                    errno != EINPROGRESS)
+                        error("connect (`%s'): %s", host, strerror(errno));
+                else
+                        break;
+                close(s);
+                s = -1;
+        }
+        freeaddrinfo(aitop);
+        return s;
+}
+
+int
+conalloc(char *iname, char *oname)
+{
+        int s;
+        char *namebase, *name, *namelist;
+
+        namebase = namelist = xstrdup(iname);
+
+        do {
+                name = xstrsep(&namelist, ",");
+                if (!name) {
+                        xfree(namebase);
+                        return (-1);
+                }
+        } while ((s = tcpconnect(name)) < 0);
+
+        if (s >= maxfd)
+                fatal("conalloc: fdno %d too high", s);
+        if (fdcon[s].c_status)
+                fatal("conalloc: attempt to reuse fdno %d", s);
+
+        fdcon[s].c_fd = s;
+        fdcon[s].c_status = CS_CON;
+        fdcon[s].c_namebase = namebase;
+        fdcon[s].c_name = name;
+        fdcon[s].c_namelist = namelist;
+        fdcon[s].c_output_name = xstrdup(oname);
+        fdcon[s].c_data = (char *) &fdcon[s].c_plen;
+        fdcon[s].c_len = 4;
+        fdcon[s].c_off = 0;
+        gettimeofday(&fdcon[s].c_tv, NULL);
+        fdcon[s].c_tv.tv_sec += timeout;
+        TAILQ_INSERT_TAIL(&tq, &fdcon[s], c_link);
+        FD_SET(s, read_wait);
+        ncon++;
+        return (s);
+}
+
+void
+confree(int s)
+{
+        if (s >= maxfd || fdcon[s].c_status == CS_UNUSED)
+                fatal("confree: attempt to free bad fdno %d", s);
+        close(s);
+        xfree(fdcon[s].c_namebase);
+        xfree(fdcon[s].c_output_name);
+        if (fdcon[s].c_status == CS_KEYS)
+                xfree(fdcon[s].c_data);
+        fdcon[s].c_status = CS_UNUSED;
+        TAILQ_REMOVE(&tq, &fdcon[s], c_link);
+        FD_CLR(s, read_wait);
+        ncon--;
+}
+
+void
+contouch(int s)
+{
+        TAILQ_REMOVE(&tq, &fdcon[s], c_link);
+        gettimeofday(&fdcon[s].c_tv, NULL);
+        fdcon[s].c_tv.tv_sec += timeout;
+        TAILQ_INSERT_TAIL(&tq, &fdcon[s], c_link);
+}
+
+int
+conrecycle(int s)
+{
+        int ret;
+        con *c = &fdcon[s];
+        char *iname, *oname;
+
+        iname = xstrdup(c->c_namelist);
+        oname = xstrdup(c->c_output_name);
+        confree(s);
+        ret = conalloc(iname, oname);
+        xfree(iname);
+        xfree(oname);
+        return (ret);
+}
+
+void
+congreet(int s)
+{
+        char buf[80], *cp;
+        size_t bufsiz;
+        int n = 0;
+        con *c = &fdcon[s];
+
+        bufsiz = sizeof(buf);
+        cp = buf;
+        while (bufsiz-- && (n = read(s, cp, 1)) == 1 && *cp != '\n' && *cp != '\r')
+                cp++;
+        if (n < 0) {
+                if (errno != ECONNREFUSED)
+                        error("read (%s): %s", c->c_name, strerror(errno));
+                conrecycle(s);
+                return;
+        }
+        if (*cp != '\n' && *cp != '\r') {
+                error("%s: bad greeting", c->c_name);
+                confree(s);
+                return;
+        }
+        *cp = '\0';
+        fprintf(stderr, "# %s %s\n", c->c_name, buf);
+        n = snprintf(buf, sizeof buf, "SSH-1.5-OpenSSH-keyscan\r\n");
+        if (atomicio(write, s, buf, n) != n) {
+                error("write (%s): %s", c->c_name, strerror(errno));
+                confree(s);
+                return;
+        }
+        c->c_status = CS_SIZE;
+        contouch(s);
+}
+
+void
+conread(int s)
+{
+        int n;
+        con *c = &fdcon[s];
+
+        if (c->c_status == CS_CON) {
+                congreet(s);
+                return;
+        }
+        n = read(s, c->c_data + c->c_off, c->c_len - c->c_off);
+        if (n < 0) {
+                error("read (%s): %s", c->c_name, strerror(errno));
+                confree(s);
+                return;
+        }
+        c->c_off += n;
+
+        if (c->c_off == c->c_len)
+                switch (c->c_status) {
+                case CS_SIZE:
+                        c->c_plen = htonl(c->c_plen);
+                        c->c_len = c->c_plen + 8 - (c->c_plen & 7);
+                        c->c_off = 0;
+                        c->c_data = xmalloc(c->c_len);
+                        c->c_status = CS_KEYS;
+                        break;
+                case CS_KEYS:
+                        keyprint(c->c_name, c->c_output_name, c->c_data, c->c_plen);
+                        confree(s);
+                        return;
+                        break;
+                default:
+                        fatal("conread: invalid status %d", c->c_status);
+                        break;
+                }
+
+        contouch(s);
+}
+
+void
+conloop(void)
+{
+        fd_set *r, *e;
+        struct timeval seltime, now;
+        int i;
+        con *c;
+
+        gettimeofday(&now, NULL);
+        c = tq.tqh_first;
+
+        if (c && (c->c_tv.tv_sec > now.tv_sec ||
+            (c->c_tv.tv_sec == now.tv_sec && c->c_tv.tv_usec > now.tv_usec))) {
+                seltime = c->c_tv;
+                seltime.tv_sec -= now.tv_sec;
+                seltime.tv_usec -= now.tv_usec;
+                if (seltime.tv_usec < 0) {
+                        seltime.tv_usec += 1000000;
+                        seltime.tv_sec--;
+                }
+        } else
+                seltime.tv_sec = seltime.tv_usec = 0;
+
+        r = xmalloc(read_wait_size);
+        memcpy(r, read_wait, read_wait_size);
+        e = xmalloc(read_wait_size);
+        memcpy(e, read_wait, read_wait_size);
+
+        while (select(maxfd, r, NULL, e, &seltime) == -1 &&
+            (errno == EAGAIN || errno == EINTR))
+                ;
+
+        for (i = 0; i < maxfd; i++) {
+                if (FD_ISSET(i, e)) {
+                        error("%s: exception!", fdcon[i].c_name);
+                        confree(i);
+                } else if (FD_ISSET(i, r))
+                        conread(i);
+        }
+        xfree(r);
+        xfree(e);
+
+        c = tq.tqh_first;
+        while (c && (c->c_tv.tv_sec < now.tv_sec ||
+            (c->c_tv.tv_sec == now.tv_sec && c->c_tv.tv_usec < now.tv_usec))) {
+                int s = c->c_fd;
+
+                c = c->c_link.tqe_next;
+                conrecycle(s);
+        }
+}
+
+char *
+nexthost(int argc, char **argv)
+{
+        static Linebuf *lb;
+
+        for (;;) {
+                if (!lb) {
+                        if (argno >= argc)
+                                return (NULL);
+                        if (argv[argno][0] != '-')
+                                return (argv[argno++]);
+                        if (!strcmp(argv[argno], "--")) {
+                                if (++argno >= argc)
+                                        return (NULL);
+                                return (argv[argno++]);
+                        } else if (!strncmp(argv[argno], "-f", 2)) {
+                                char *fname;
+
+                                if (argv[argno][2])
+                                        fname = &argv[argno++][2];
+                                else if (++argno >= argc) {
+                                        error("missing filename for `-f'");
+                                        return (NULL);
+                                } else
+                                        fname = argv[argno++];
+                                if (!strcmp(fname, "-"))
+                                        fname = NULL;
+                                lb = Linebuf_alloc(fname, error);
+                        } else
+                                error("ignoring invalid/misplaced option `%s'",
+                                    argv[argno++]);
+                } else {
+                        char *line;
+
+                        line = Linebuf_getline(lb);
+                        if (line)
+                                return (line);
+                        Linebuf_free(lb);
+                        lb = NULL;
+                }
+        }
+}
+
+void
+usage(void)
+{
+        fatal("usage: %s [-t timeout] { [--] host | -f file } ...", __progname);
+        return;
+}
+
+int
+main(int argc, char **argv)
+{
+        char *host = NULL;
+
+        __progname = get_progname(argv[0]);
+        TAILQ_INIT(&tq);
+
+        if (argc <= argno)
+                usage();
+
+        if (argv[1][0] == '-' && argv[1][1] == 't') {
+                argno++;
+                if (argv[1][2])
+                        timeout = atoi(&argv[1][2]);
+                else {
+                        if (argno >= argc)
+                                usage();
+                        timeout = atoi(argv[argno++]);
+                }
+                if (timeout <= 0)
+                        usage();
+        }
+        if (argc <= argno)
+                usage();
+
+        maxfd = fdlim_get(1);
+        if (maxfd < 0)
+                fatal("%s: fdlim_get: bad value", __progname);
+        if (maxfd > MAXMAXFD)
+                maxfd = MAXMAXFD;
+        if (MAXCON <= 0)
+                fatal("%s: not enough file descriptors", __progname);
+        if (maxfd > fdlim_get(0))
+                fdlim_set(maxfd);
+        fdcon = xmalloc(maxfd * sizeof(con));
+        memset(fdcon, 0, maxfd * sizeof(con));
+
+        read_wait_size = howmany(maxfd, NFDBITS) * sizeof(fd_mask);
+        read_wait = xmalloc(read_wait_size);
+        memset(read_wait, 0, read_wait_size);
+
+        do {
+                while (ncon < MAXCON) {
+                        char *name;
+
+                        host = nexthost(argc, argv);
+                        if (host == NULL)
+                                break;
+                        name = strnnsep(&host, " \t\n");
+                        conalloc(name, *host ? host : name);
+                }
+                conloop();
+        } while (host);
+        while (ncon > 0)
+                conloop();
+
+        return (0);
+}