| version 1.23.2.1, 2000/06/12 02:37:31 |
version 1.23.2.2, 2000/09/01 18:23:17 |
|
|
| */ |
*/ |
| |
|
| #include "includes.h" |
#include "includes.h" |
| RCSID("$Id$"); |
RCSID("$OpenBSD$"); |
| |
|
| #include "rsa.h" |
#include "rsa.h" |
| #include "packet.h" |
#include "packet.h" |
|
|
| #include "uidswap.h" |
#include "uidswap.h" |
| #include "match.h" |
#include "match.h" |
| #include "servconf.h" |
#include "servconf.h" |
| |
#include "auth-options.h" |
| |
|
| #include <openssl/rsa.h> |
#include <openssl/rsa.h> |
| #include <openssl/md5.h> |
#include <openssl/md5.h> |
| |
|
| /* Flags that may be set in authorized_keys options. */ |
|
| extern int no_port_forwarding_flag; |
|
| extern int no_agent_forwarding_flag; |
|
| extern int no_x11_forwarding_flag; |
|
| extern int no_pty_flag; |
|
| extern char *forced_command; |
|
| extern struct envstring *custom_environment; |
|
| |
|
| /* |
/* |
| * Session identifier that is used to bind key exchange and authentication |
* Session identifier that is used to bind key exchange and authentication |
| * responses to a particular session. |
* responses to a particular session. |
|
|
| unsigned long linenum = 0; |
unsigned long linenum = 0; |
| struct stat st; |
struct stat st; |
| RSA *pk; |
RSA *pk; |
| int mname, mip; |
|
| |
|
| /* Temporarily use the user's uid. */ |
/* Temporarily use the user's uid. */ |
| temporarily_use_uid(pw->pw_uid); |
temporarily_use_uid(pw->pw_uid); |
|
|
| } |
} |
| if (fail) { |
if (fail) { |
| fclose(f); |
fclose(f); |
| log(buf); |
log("%s",buf); |
| packet_send_debug(buf); |
packet_send_debug("%s",buf); |
| restore_uid(); |
restore_uid(); |
| return 0; |
return 0; |
| } |
} |
|
|
| * authenticated. Note that we have not yet processed the |
* authenticated. Note that we have not yet processed the |
| * options; this will be reset if the options cause the |
* options; this will be reset if the options cause the |
| * authentication to be rejected. |
* authentication to be rejected. |
| */ |
|
| authenticated = 1; |
|
| |
|
| /* RSA part of authentication was accepted. Now process the options. */ |
|
| if (options) { |
|
| while (*options && *options != ' ' && *options != '\t') { |
|
| cp = "no-port-forwarding"; |
|
| if (strncmp(options, cp, strlen(cp)) == 0) { |
|
| packet_send_debug("Port forwarding disabled."); |
|
| no_port_forwarding_flag = 1; |
|
| options += strlen(cp); |
|
| goto next_option; |
|
| } |
|
| cp = "no-agent-forwarding"; |
|
| if (strncmp(options, cp, strlen(cp)) == 0) { |
|
| packet_send_debug("Agent forwarding disabled."); |
|
| no_agent_forwarding_flag = 1; |
|
| options += strlen(cp); |
|
| goto next_option; |
|
| } |
|
| cp = "no-X11-forwarding"; |
|
| if (strncmp(options, cp, strlen(cp)) == 0) { |
|
| packet_send_debug("X11 forwarding disabled."); |
|
| no_x11_forwarding_flag = 1; |
|
| options += strlen(cp); |
|
| goto next_option; |
|
| } |
|
| cp = "no-pty"; |
|
| if (strncmp(options, cp, strlen(cp)) == 0) { |
|
| packet_send_debug("Pty allocation disabled."); |
|
| no_pty_flag = 1; |
|
| options += strlen(cp); |
|
| goto next_option; |
|
| } |
|
| cp = "command=\""; |
|
| if (strncmp(options, cp, strlen(cp)) == 0) { |
|
| int i; |
|
| options += strlen(cp); |
|
| forced_command = xmalloc(strlen(options) + 1); |
|
| i = 0; |
|
| while (*options) { |
|
| if (*options == '"') |
|
| break; |
|
| if (*options == '\\' && options[1] == '"') { |
|
| options += 2; |
|
| forced_command[i++] = '"'; |
|
| continue; |
|
| } |
|
| forced_command[i++] = *options++; |
|
| } |
|
| if (!*options) { |
|
| debug("%.100s, line %lu: missing end quote", |
|
| SSH_USER_PERMITTED_KEYS, linenum); |
|
| packet_send_debug("%.100s, line %lu: missing end quote", |
|
| SSH_USER_PERMITTED_KEYS, linenum); |
|
| continue; |
|
| } |
|
| forced_command[i] = 0; |
|
| packet_send_debug("Forced command: %.900s", forced_command); |
|
| options++; |
|
| goto next_option; |
|
| } |
|
| cp = "environment=\""; |
|
| if (strncmp(options, cp, strlen(cp)) == 0) { |
|
| int i; |
|
| char *s; |
|
| struct envstring *new_envstring; |
|
| options += strlen(cp); |
|
| s = xmalloc(strlen(options) + 1); |
|
| i = 0; |
|
| while (*options) { |
|
| if (*options == '"') |
|
| break; |
|
| if (*options == '\\' && options[1] == '"') { |
|
| options += 2; |
|
| s[i++] = '"'; |
|
| continue; |
|
| } |
|
| s[i++] = *options++; |
|
| } |
|
| if (!*options) { |
|
| debug("%.100s, line %lu: missing end quote", |
|
| SSH_USER_PERMITTED_KEYS, linenum); |
|
| packet_send_debug("%.100s, line %lu: missing end quote", |
|
| SSH_USER_PERMITTED_KEYS, linenum); |
|
| continue; |
|
| } |
|
| s[i] = 0; |
|
| packet_send_debug("Adding to environment: %.900s", s); |
|
| debug("Adding to environment: %.900s", s); |
|
| options++; |
|
| 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 (strncmp(options, cp, strlen(cp)) == 0) { |
|
| char *patterns = xmalloc(strlen(options) + 1); |
|
| int i; |
|
| options += strlen(cp); |
|
| i = 0; |
|
| while (*options) { |
|
| if (*options == '"') |
|
| break; |
|
| if (*options == '\\' && options[1] == '"') { |
|
| options += 2; |
|
| patterns[i++] = '"'; |
|
| continue; |
|
| } |
|
| patterns[i++] = *options++; |
|
| } |
|
| if (!*options) { |
|
| debug("%.100s, line %lu: missing end quote", |
|
| SSH_USER_PERMITTED_KEYS, linenum); |
|
| packet_send_debug("%.100s, line %lu: missing end quote", |
|
| SSH_USER_PERMITTED_KEYS, linenum); |
|
| continue; |
|
| } |
|
| patterns[i] = 0; |
|
| options++; |
|
| /* |
|
| * 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(get_canonical_hostname(), |
|
| patterns, strlen(patterns)); |
|
| mip = match_hostname(get_remote_ipaddr(), |
|
| patterns, strlen(patterns)); |
|
| if (mname == -1 || mip == -1 || |
|
| (mname != 1 && mip != 1)) { |
|
| log("RSA authentication tried for %.100s with correct key but not from a permitted host (host=%.200s, ip=%.200s).", |
|
| pw->pw_name, get_canonical_hostname(), |
|
| get_remote_ipaddr()); |
|
| packet_send_debug("Your host '%.200s' is not permitted to use this key for login.", |
|
| get_canonical_hostname()); |
|
| xfree(patterns); |
|
| /* key invalid for this host, reset flags */ |
|
| authenticated = 0; |
|
| 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; |
|
| } |
|
| break; |
|
| } |
|
| xfree(patterns); |
|
| /* Host name matches. */ |
|
| goto next_option; |
|
| } |
|
| bad_option: |
|
| log("Bad options in %.100s file, line %lu: %.50s", |
|
| SSH_USER_PERMITTED_KEYS, linenum, options); |
|
| packet_send_debug("Bad options in %.100s file, line %lu: %.50s", |
|
| SSH_USER_PERMITTED_KEYS, linenum, options); |
|
| authenticated = 0; |
|
| break; |
|
| |
|
| next_option: |
|
| /* |
|
| * Skip the comma, and move to the next option |
|
| * (or break out if there are no more). |
|
| */ |
|
| if (!*options) |
|
| fatal("Bugs in auth-rsa.c option processing."); |
|
| if (*options == ' ' || *options == '\t') |
|
| break; /* End of options. */ |
|
| if (*options != ',') |
|
| goto bad_option; |
|
| options++; |
|
| /* Process the next option. */ |
|
| continue; |
|
| } |
|
| } |
|
| /* |
|
| * Break out of the loop if authentication was successful; |
* Break out of the loop if authentication was successful; |
| * otherwise continue searching. |
* otherwise continue searching. |
| */ |
*/ |
| |
authenticated = auth_parse_options(pw, options, linenum); |
| if (authenticated) |
if (authenticated) |
| break; |
break; |
| } |
} |
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