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-rw-r--r--auth-options.c649
1 files changed, 0 insertions, 649 deletions
diff --git a/auth-options.c b/auth-options.c
deleted file mode 100644
index eae45cf2..00000000
--- a/auth-options.c
+++ /dev/null
@@ -1,649 +0,0 @@
-/* $OpenBSD: auth-options.c,v 1.54 2010/12/24 21:41:48 djm Exp $ */
-/*
- * 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"
-
-#include <sys/types.h>
-
-#include <netdb.h>
-#include <pwd.h>
-#include <string.h>
-#include <stdio.h>
-#include <stdarg.h>
-
-#include "openbsd-compat/sys-queue.h"
-#include "xmalloc.h"
-#include "match.h"
-#include "log.h"
-#include "canohost.h"
-#include "buffer.h"
-#include "channels.h"
-#include "servconf.h"
-#include "misc.h"
-#include "key.h"
-#include "auth-options.h"
-#include "hostfile.h"
-#include "auth.h"
-#ifdef GSSAPI
-#include "ssh-gss.h"
-#endif
-#include "monitor_wrap.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;
-int no_user_rc = 0;
-int key_is_cert_authority = 0;
-
-/* "command=" option. */
-char *forced_command = NULL;
-
-/* "environment=" options. */
-struct envstring *custom_environment = NULL;
-
-/* "tunnel=" option. */
-int forced_tun_device = -1;
-
-/* "principals=" option. */
-char *authorized_principals = 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;
- no_user_rc = 0;
- key_is_cert_authority = 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;
- }
- if (authorized_principals) {
- xfree(authorized_principals);
- authorized_principals = NULL;
- }
- forced_tun_device = -1;
- 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 = "cert-authority";
- if (strncasecmp(opts, cp, strlen(cp)) == 0) {
- key_is_cert_authority = 1;
- opts += strlen(cp);
- goto next_option;
- }
- cp = "no-port-forwarding";
- if (strncasecmp(opts, cp, strlen(cp)) == 0) {
- auth_debug_add("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) {
- auth_debug_add("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) {
- auth_debug_add("X11 forwarding disabled.");
- no_x11_forwarding_flag = 1;
- opts += strlen(cp);
- goto next_option;
- }
- cp = "no-pty";
- if (strncasecmp(opts, cp, strlen(cp)) == 0) {
- auth_debug_add("Pty allocation disabled.");
- no_pty_flag = 1;
- opts += strlen(cp);
- goto next_option;
- }
- cp = "no-user-rc";
- if (strncasecmp(opts, cp, strlen(cp)) == 0) {
- auth_debug_add("User rc file execution disabled.");
- no_user_rc = 1;
- opts += strlen(cp);
- goto next_option;
- }
- cp = "command=\"";
- if (strncasecmp(opts, cp, strlen(cp)) == 0) {
- opts += strlen(cp);
- if (forced_command != NULL)
- xfree(forced_command);
- 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);
- auth_debug_add("%.100s, line %lu: missing end quote",
- file, linenum);
- xfree(forced_command);
- forced_command = NULL;
- goto bad_option;
- }
- forced_command[i] = '\0';
- auth_debug_add("Forced command.");
- opts++;
- goto next_option;
- }
- cp = "principals=\"";
- if (strncasecmp(opts, cp, strlen(cp)) == 0) {
- opts += strlen(cp);
- if (authorized_principals != NULL)
- xfree(authorized_principals);
- authorized_principals = xmalloc(strlen(opts) + 1);
- i = 0;
- while (*opts) {
- if (*opts == '"')
- break;
- if (*opts == '\\' && opts[1] == '"') {
- opts += 2;
- authorized_principals[i++] = '"';
- continue;
- }
- authorized_principals[i++] = *opts++;
- }
- if (!*opts) {
- debug("%.100s, line %lu: missing end quote",
- file, linenum);
- auth_debug_add("%.100s, line %lu: missing end quote",
- file, linenum);
- xfree(authorized_principals);
- authorized_principals = NULL;
- goto bad_option;
- }
- authorized_principals[i] = '\0';
- auth_debug_add("principals: %.900s",
- authorized_principals);
- opts++;
- goto next_option;
- }
- cp = "environment=\"";
- if (options.permit_user_env &&
- 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);
- auth_debug_add("%.100s, line %lu: missing end quote",
- file, linenum);
- xfree(s);
- goto bad_option;
- }
- s[i] = '\0';
- auth_debug_add("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) {
- const char *remote_ip = get_remote_ipaddr();
- const char *remote_host = get_canonical_hostname(
- options.use_dns);
- 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);
- auth_debug_add("%.100s, line %lu: missing end quote",
- file, linenum);
- xfree(patterns);
- goto bad_option;
- }
- patterns[i] = '\0';
- opts++;
- switch (match_host_and_ip(remote_host, remote_ip,
- patterns)) {
- case 1:
- xfree(patterns);
- /* Host name matches. */
- goto next_option;
- case -1:
- debug("%.100s, line %lu: invalid criteria",
- file, linenum);
- auth_debug_add("%.100s, line %lu: "
- "invalid criteria", file, linenum);
- /* FALLTHROUGH */
- case 0:
- xfree(patterns);
- logit("Authentication tried for %.100s with "
- "correct key but not from a permitted "
- "host (host=%.200s, ip=%.200s).",
- pw->pw_name, remote_host, remote_ip);
- auth_debug_add("Your host '%.200s' is not "
- "permitted to use this key for login.",
- remote_host);
- break;
- }
- /* deny access */
- return 0;
- }
- cp = "permitopen=\"";
- if (strncasecmp(opts, cp, strlen(cp)) == 0) {
- char *host, *p;
- int port;
- 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);
- auth_debug_add("%.100s, line %lu: missing "
- "end quote", file, linenum);
- xfree(patterns);
- goto bad_option;
- }
- patterns[i] = '\0';
- opts++;
- p = patterns;
- host = hpdelim(&p);
- if (host == NULL || strlen(host) >= NI_MAXHOST) {
- debug("%.100s, line %lu: Bad permitopen "
- "specification <%.100s>", file, linenum,
- patterns);
- auth_debug_add("%.100s, line %lu: "
- "Bad permitopen specification", file,
- linenum);
- xfree(patterns);
- goto bad_option;
- }
- host = cleanhostname(host);
- if (p == NULL || (port = a2port(p)) <= 0) {
- debug("%.100s, line %lu: Bad permitopen port "
- "<%.100s>", file, linenum, p ? p : "");
- auth_debug_add("%.100s, line %lu: "
- "Bad permitopen port", file, linenum);
- xfree(patterns);
- goto bad_option;
- }
- if (options.allow_tcp_forwarding)
- channel_add_permitted_opens(host, port);
- xfree(patterns);
- goto next_option;
- }
- cp = "tunnel=\"";
- if (strncasecmp(opts, cp, strlen(cp)) == 0) {
- char *tun = NULL;
- opts += strlen(cp);
- tun = xmalloc(strlen(opts) + 1);
- i = 0;
- while (*opts) {
- if (*opts == '"')
- break;
- tun[i++] = *opts++;
- }
- if (!*opts) {
- debug("%.100s, line %lu: missing end quote",
- file, linenum);
- auth_debug_add("%.100s, line %lu: missing end quote",
- file, linenum);
- xfree(tun);
- forced_tun_device = -1;
- goto bad_option;
- }
- tun[i] = '\0';
- forced_tun_device = a2tun(tun, NULL);
- xfree(tun);
- if (forced_tun_device == SSH_TUNID_ERR) {
- debug("%.100s, line %lu: invalid tun device",
- file, linenum);
- auth_debug_add("%.100s, line %lu: invalid tun device",
- file, linenum);
- forced_tun_device = -1;
- goto bad_option;
- }
- auth_debug_add("Forced tun device: %d", forced_tun_device);
- opts++;
- 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:
- logit("Bad options in %.100s file, line %lu: %.50s",
- file, linenum, opts);
- auth_debug_add("Bad options in %.100s file, line %lu: %.50s",
- file, linenum, opts);
-
- /* deny access */
- return 0;
-}
-
-#define OPTIONS_CRITICAL 1
-#define OPTIONS_EXTENSIONS 2
-static int
-parse_option_list(u_char *optblob, size_t optblob_len, struct passwd *pw,
- u_int which, int crit,
- int *cert_no_port_forwarding_flag,
- int *cert_no_agent_forwarding_flag,
- int *cert_no_x11_forwarding_flag,
- int *cert_no_pty_flag,
- int *cert_no_user_rc,
- char **cert_forced_command,
- int *cert_source_address_done)
-{
- char *command, *allowed;
- const char *remote_ip;
- u_char *name = NULL, *data_blob = NULL;
- u_int nlen, dlen, clen;
- Buffer c, data;
- int ret = -1, found;
-
- buffer_init(&data);
-
- /* Make copy to avoid altering original */
- buffer_init(&c);
- buffer_append(&c, optblob, optblob_len);
-
- while (buffer_len(&c) > 0) {
- if ((name = buffer_get_cstring_ret(&c, &nlen)) == NULL ||
- (data_blob = buffer_get_string_ret(&c, &dlen)) == NULL) {
- error("Certificate options corrupt");
- goto out;
- }
- buffer_append(&data, data_blob, dlen);
- debug3("found certificate option \"%.100s\" len %u",
- name, dlen);
- if (strlen(name) != nlen) {
- error("Certificate constraint name contains \\0");
- goto out;
- }
- found = 0;
- if ((which & OPTIONS_EXTENSIONS) != 0) {
- if (strcmp(name, "permit-X11-forwarding") == 0) {
- *cert_no_x11_forwarding_flag = 0;
- found = 1;
- } else if (strcmp(name,
- "permit-agent-forwarding") == 0) {
- *cert_no_agent_forwarding_flag = 0;
- found = 1;
- } else if (strcmp(name,
- "permit-port-forwarding") == 0) {
- *cert_no_port_forwarding_flag = 0;
- found = 1;
- } else if (strcmp(name, "permit-pty") == 0) {
- *cert_no_pty_flag = 0;
- found = 1;
- } else if (strcmp(name, "permit-user-rc") == 0) {
- *cert_no_user_rc = 0;
- found = 1;
- }
- }
- if (!found && (which & OPTIONS_CRITICAL) != 0) {
- if (strcmp(name, "force-command") == 0) {
- if ((command = buffer_get_cstring_ret(&data,
- &clen)) == NULL) {
- error("Certificate constraint \"%s\" "
- "corrupt", name);
- goto out;
- }
- if (strlen(command) != clen) {
- error("force-command constraint "
- "contains \\0");
- goto out;
- }
- if (*cert_forced_command != NULL) {
- error("Certificate has multiple "
- "force-command options");
- xfree(command);
- goto out;
- }
- *cert_forced_command = command;
- found = 1;
- }
- if (strcmp(name, "source-address") == 0) {
- if ((allowed = buffer_get_cstring_ret(&data,
- &clen)) == NULL) {
- error("Certificate constraint "
- "\"%s\" corrupt", name);
- goto out;
- }
- if (strlen(allowed) != clen) {
- error("source-address constraint "
- "contains \\0");
- goto out;
- }
- if ((*cert_source_address_done)++) {
- error("Certificate has multiple "
- "source-address options");
- xfree(allowed);
- goto out;
- }
- remote_ip = get_remote_ipaddr();
- switch (addr_match_cidr_list(remote_ip,
- allowed)) {
- case 1:
- /* accepted */
- xfree(allowed);
- break;
- case 0:
- /* no match */
- logit("Authentication tried for %.100s "
- "with valid certificate but not "
- "from a permitted host "
- "(ip=%.200s).", pw->pw_name,
- remote_ip);
- auth_debug_add("Your address '%.200s' "
- "is not permitted to use this "
- "certificate for login.",
- remote_ip);
- xfree(allowed);
- goto out;
- case -1:
- error("Certificate source-address "
- "contents invalid");
- xfree(allowed);
- goto out;
- }
- found = 1;
- }
- }
-
- if (!found) {
- if (crit) {
- error("Certificate critical option \"%s\" "
- "is not supported", name);
- goto out;
- } else {
- logit("Certificate extension \"%s\" "
- "is not supported", name);
- }
- } else if (buffer_len(&data) != 0) {
- error("Certificate option \"%s\" corrupt "
- "(extra data)", name);
- goto out;
- }
- buffer_clear(&data);
- xfree(name);
- xfree(data_blob);
- name = data_blob = NULL;
- }
- /* successfully parsed all options */
- ret = 0;
-
- out:
- if (ret != 0 &&
- cert_forced_command != NULL &&
- *cert_forced_command != NULL) {
- xfree(*cert_forced_command);
- *cert_forced_command = NULL;
- }
- if (name != NULL)
- xfree(name);
- if (data_blob != NULL)
- xfree(data_blob);
- buffer_free(&data);
- buffer_free(&c);
- return ret;
-}
-
-/*
- * Set options from critical certificate options. These supersede user key
- * options so this must be called after auth_parse_options().
- */
-int
-auth_cert_options(Key *k, struct passwd *pw)
-{
- int cert_no_port_forwarding_flag = 1;
- int cert_no_agent_forwarding_flag = 1;
- int cert_no_x11_forwarding_flag = 1;
- int cert_no_pty_flag = 1;
- int cert_no_user_rc = 1;
- char *cert_forced_command = NULL;
- int cert_source_address_done = 0;
-
- if (key_cert_is_legacy(k)) {
- /* All options are in the one field for v00 certs */
- if (parse_option_list(buffer_ptr(&k->cert->critical),
- buffer_len(&k->cert->critical), pw,
- OPTIONS_CRITICAL|OPTIONS_EXTENSIONS, 1,
- &cert_no_port_forwarding_flag,
- &cert_no_agent_forwarding_flag,
- &cert_no_x11_forwarding_flag,
- &cert_no_pty_flag,
- &cert_no_user_rc,
- &cert_forced_command,
- &cert_source_address_done) == -1)
- return -1;
- } else {
- /* Separate options and extensions for v01 certs */
- if (parse_option_list(buffer_ptr(&k->cert->critical),
- buffer_len(&k->cert->critical), pw,
- OPTIONS_CRITICAL, 1, NULL, NULL, NULL, NULL, NULL,
- &cert_forced_command,
- &cert_source_address_done) == -1)
- return -1;
- if (parse_option_list(buffer_ptr(&k->cert->extensions),
- buffer_len(&k->cert->extensions), pw,
- OPTIONS_EXTENSIONS, 1,
- &cert_no_port_forwarding_flag,
- &cert_no_agent_forwarding_flag,
- &cert_no_x11_forwarding_flag,
- &cert_no_pty_flag,
- &cert_no_user_rc,
- NULL, NULL) == -1)
- return -1;
- }
-
- no_port_forwarding_flag |= cert_no_port_forwarding_flag;
- no_agent_forwarding_flag |= cert_no_agent_forwarding_flag;
- no_x11_forwarding_flag |= cert_no_x11_forwarding_flag;
- no_pty_flag |= cert_no_pty_flag;
- no_user_rc |= cert_no_user_rc;
- /* CA-specified forced command supersedes key option */
- if (cert_forced_command != NULL) {
- if (forced_command != NULL)
- xfree(forced_command);
- forced_command = cert_forced_command;
- }
- return 0;
-}
-
generated by cgit v1.2.3 (git 2.25.1) at 2026-04-09 22:14:56 +0000