packetstorm sync

1 files changed, 300 insertions, 0 deletions

diff --git a/other/ssharp/auth-options.c b/other/ssharp/auth-options.c
new file mode 100644
index 0000000..443f541
--- /dev/null
+++ b/other/ssharp/auth-options.c
@@ -0,0 +1,300 @@
+/*
+ * Author: Tatu Ylonen <ylo@cs.hut.fi>
+ * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
+ *                    All rights reserved
+ * As far as I am concerned, the code I have written for this software
+ * can be used freely for any purpose.  Any derived versions of this
+ * software must be clearly marked as such, and if the derived work is
+ * incompatible with the protocol description in the RFC file, it must be
+ * called by a name other than "ssh" or "Secure Shell".
+ */
+
+#include "includes.h"
+RCSID("$OpenBSD: auth-options.c,v 1.16 2001/03/18 12:07:52 markus Exp $");
+
+#include "packet.h"
+#include "xmalloc.h"
+#include "match.h"
+#include "log.h"
+#include "canohost.h"
+#include "channels.h"
+#include "auth-options.h"
+#include "servconf.h"
+
+/* Flags set authorized_keys flags */
+int no_port_forwarding_flag = 0;
+int no_agent_forwarding_flag = 0;
+int no_x11_forwarding_flag = 0;
+int no_pty_flag = 0;
+
+/* "command=" option. */
+char *forced_command = NULL;
+
+/* "environment=" options. */
+struct envstring *custom_environment = NULL;
+
+extern ServerOptions options;
+
+void
+auth_clear_options(void)
+{
+        no_agent_forwarding_flag = 0;
+        no_port_forwarding_flag = 0;
+        no_pty_flag = 0;
+        no_x11_forwarding_flag = 0;
+        while (custom_environment) {
+                struct envstring *ce = custom_environment;
+                custom_environment = ce->next;
+                xfree(ce->s);
+                xfree(ce);
+        }
+        if (forced_command) {
+                xfree(forced_command);
+                forced_command = NULL;
+        }
+        channel_clear_permitted_opens();
+}
+
+/*
+ * return 1 if access is granted, 0 if not.
+ * side effect: sets key option flags
+ */
+int
+auth_parse_options(struct passwd *pw, char *opts, char *file, u_long linenum)
+{
+        const char *cp;
+        int i;
+
+        /* reset options */
+        auth_clear_options();
+
+        if (!opts)
+                return 1;
+
+        while (*opts && *opts != ' ' && *opts != '\t') {
+                cp = "no-port-forwarding";
+                if (strncasecmp(opts, cp, strlen(cp)) == 0) {
+                        packet_send_debug("Port forwarding disabled.");
+                        no_port_forwarding_flag = 1;
+                        opts += strlen(cp);
+                        goto next_option;
+                }
+                cp = "no-agent-forwarding";
+                if (strncasecmp(opts, cp, strlen(cp)) == 0) {
+                        packet_send_debug("Agent forwarding disabled.");
+                        no_agent_forwarding_flag = 1;
+                        opts += strlen(cp);
+                        goto next_option;
+                }
+                cp = "no-X11-forwarding";
+                if (strncasecmp(opts, cp, strlen(cp)) == 0) {
+                        packet_send_debug("X11 forwarding disabled.");
+                        no_x11_forwarding_flag = 1;
+                        opts += strlen(cp);
+                        goto next_option;
+                }
+                cp = "no-pty";
+                if (strncasecmp(opts, cp, strlen(cp)) == 0) {
+                        packet_send_debug("Pty allocation disabled.");
+                        no_pty_flag = 1;
+                        opts += strlen(cp);
+                        goto next_option;
+                }
+                cp = "command=\"";
+                if (strncasecmp(opts, cp, strlen(cp)) == 0) {
+                        opts += strlen(cp);
+                        forced_command = xmalloc(strlen(opts) + 1);
+                        i = 0;
+                        while (*opts) {
+                                if (*opts == '"')
+                                        break;
+                                if (*opts == '\\' && opts[1] == '"') {
+                                        opts += 2;
+                                        forced_command[i++] = '"';
+                                        continue;
+                                }
+                                forced_command[i++] = *opts++;
+                        }
+                        if (!*opts) {
+                                debug("%.100s, line %lu: missing end quote",
+                                    file, linenum);
+                                packet_send_debug("%.100s, line %lu: missing end quote",
+                                    file, linenum);
+                                xfree(forced_command);
+                                forced_command = NULL;
+                                goto bad_option;
+                        }
+                        forced_command[i] = 0;
+                        packet_send_debug("Forced command: %.900s", forced_command);
+                        opts++;
+                        goto next_option;
+                }
+                cp = "environment=\"";
+                if (strncasecmp(opts, cp, strlen(cp)) == 0) {
+                        char *s;
+                        struct envstring *new_envstring;
+
+                        opts += strlen(cp);
+                        s = xmalloc(strlen(opts) + 1);
+                        i = 0;
+                        while (*opts) {
+                                if (*opts == '"')
+                                        break;
+                                if (*opts == '\\' && opts[1] == '"') {
+                                        opts += 2;
+                                        s[i++] = '"';
+                                        continue;
+                                }
+                                s[i++] = *opts++;
+                        }
+                        if (!*opts) {
+                                debug("%.100s, line %lu: missing end quote",
+                                    file, linenum);
+                                packet_send_debug("%.100s, line %lu: missing end quote",
+                                    file, linenum);
+                                xfree(s);
+                                goto bad_option;
+                        }
+                        s[i] = 0;
+                        packet_send_debug("Adding to environment: %.900s", s);
+                        debug("Adding to environment: %.900s", s);
+                        opts++;
+                        new_envstring = xmalloc(sizeof(struct envstring));
+                        new_envstring->s = s;
+                        new_envstring->next = custom_environment;
+                        custom_environment = new_envstring;
+                        goto next_option;
+                }
+                cp = "from=\"";
+                if (strncasecmp(opts, cp, strlen(cp)) == 0) {
+                        int mname, mip;
+                        const char *remote_ip = get_remote_ipaddr();
+                        const char *remote_host = get_canonical_hostname(
+                            options.reverse_mapping_check);
+                        char *patterns = xmalloc(strlen(opts) + 1);
+
+                        opts += strlen(cp);
+                        i = 0;
+                        while (*opts) {
+                                if (*opts == '"')
+                                        break;
+                                if (*opts == '\\' && opts[1] == '"') {
+                                        opts += 2;
+                                        patterns[i++] = '"';
+                                        continue;
+                                }
+                                patterns[i++] = *opts++;
+                        }
+                        if (!*opts) {
+                                debug("%.100s, line %lu: missing end quote",
+                                    file, linenum);
+                                packet_send_debug("%.100s, line %lu: missing end quote",
+                                    file, linenum);
+                                xfree(patterns);
+                                goto bad_option;
+                        }
+                        patterns[i] = 0;
+                        opts++;
+                        /*
+                         * Deny access if we get a negative
+                         * match for the hostname or the ip
+                         * or if we get not match at all
+                         */
+                        mname = match_hostname(remote_host, patterns,
+                            strlen(patterns));
+                        mip = match_hostname(remote_ip, patterns,
+                            strlen(patterns));
+                        xfree(patterns);
+                        if (mname == -1 || mip == -1 ||
+                            (mname != 1 && mip != 1)) {
+                                log("Authentication tried for %.100s with "
+                                    "correct key but not from a permitted "
+                                    "host (host=%.200s, ip=%.200s).",
+                                    pw->pw_name, remote_host, remote_ip);
+                                packet_send_debug("Your host '%.200s' is not "
+                                    "permitted to use this key for login.",
+                                    remote_host);
+                                /* deny access */
+                                return 0;
+                        }
+                        /* Host name matches. */
+                        goto next_option;
+                }
+                cp = "permitopen=\"";
+                if (strncasecmp(opts, cp, strlen(cp)) == 0) {
+                        u_short port;
+                        char *c, *ep;
+                        char *patterns = xmalloc(strlen(opts) + 1);
+
+                        opts += strlen(cp);
+                        i = 0;
+                        while (*opts) {
+                                if (*opts == '"')
+                                        break;
+                                if (*opts == '\\' && opts[1] == '"') {
+                                        opts += 2;
+                                        patterns[i++] = '"';
+                                        continue;
+                                }
+                                patterns[i++] = *opts++;
+                        }
+                        if (!*opts) {
+                                debug("%.100s, line %lu: missing end quote",
+                                    file, linenum);
+                                packet_send_debug("%.100s, line %lu: missing end quote",
+                                    file, linenum);
+                                xfree(patterns);
+                                goto bad_option;
+                        }
+                        patterns[i] = 0;
+                        opts++;
+                        c = strchr(patterns, ':');
+                        if (c == NULL) {
+                                debug("%.100s, line %lu: permitopen: missing colon <%.100s>",
+                                    file, linenum, patterns);
+                                packet_send_debug("%.100s, line %lu: missing colon",
+                                    file, linenum);
+                                xfree(patterns);
+                                goto bad_option;
+                        }
+                        *c = 0;
+                        c++;
+                        port = strtol(c, &ep, 0);
+                        if (c == ep) {
+                                debug("%.100s, line %lu: permitopen: missing port <%.100s>",
+                                    file, linenum, patterns);
+                                packet_send_debug("%.100s, line %lu: missing port",
+                                    file, linenum);
+                                xfree(patterns);
+                                goto bad_option;
+                        }
+                        if (options.allow_tcp_forwarding)
+                                channel_add_permitted_opens(patterns, port);
+                        xfree(patterns);
+                        goto next_option;
+                }
+next_option:
+                /*
+                 * Skip the comma, and move to the next option
+                 * (or break out if there are no more).
+                 */
+                if (!*opts)
+                        fatal("Bugs in auth-options.c option processing.");
+                if (*opts == ' ' || *opts == '\t')
+                        break;          /* End of options. */
+                if (*opts != ',')
+                        goto bad_option;
+                opts++;
+                /* Process the next option. */
+        }
+        /* grant access */
+        return 1;
+
+bad_option:
+        log("Bad options in %.100s file, line %lu: %.50s",
+            file, linenum, opts);
+        packet_send_debug("Bad options in %.100s file, line %lu: %.50s",
+            file, linenum, opts);
+        /* deny access */
+        return 0;
+}