- (tim) [config.guess config.sub] Update to '2005-05-27' version.

[openssh.git] / auth-pam.c

diff --git a/auth-pam.c b/auth-pam.c
index 7ecca946e4905bac0fb5998b5fa466fe4df5c821..d25cff3750585551d02442709369c5d629184301 100644 (file)
--- a/auth-pam.c
+++ b/auth-pam.c
@@ -56,6 +56,13 @@ RCSID("$Id$");
 #include <pam/pam_appl.h>
 #endif
 
+/* OpenGroup RFC86.0 and XSSO specify no "const" on arguments */
+#ifdef PAM_SUN_CODEBASE
+# define sshpam_const          /* Solaris, HP-UX, AIX */
+#else
+# define sshpam_const  const   /* LinuxPAM, OpenPAM */
+#endif
+
 #include "auth.h"
 #include "auth-pam.h"
 #include "buffer.h"
@@ -76,7 +83,17 @@ extern Buffer loginmsg;
 extern int compat20;
 extern u_int utmp_len;
 
+/* so we don't silently change behaviour */
 #ifdef USE_POSIX_THREADS
+# error "USE_POSIX_THREADS replaced by UNSUPPORTED_POSIX_THREADS_HACK"
+#endif
+
+/*
+ * Formerly known as USE_POSIX_THREADS, using this is completely unsupported
+ * and generally a bad idea.  Use at own risk and do not expect support if
+ * this breaks.
+ */
+#ifdef UNSUPPORTED_POSIX_THREADS_HACK
 #include <pthread.h>
 /*
  * Avoid namespace clash when *not* using pthreads for systems *with*
@@ -98,7 +115,7 @@ struct pam_ctxt {
 static void sshpam_free_ctx(void *);
 static struct pam_ctxt *cleanup_ctxt;
 
-#ifndef USE_POSIX_THREADS
+#ifndef UNSUPPORTED_POSIX_THREADS_HACK
 /*
  * Simulate threads with processes.
  */
@@ -186,6 +203,7 @@ static int sshpam_account_status = -1;
 static char **sshpam_env = NULL;
 static Authctxt *sshpam_authctxt = NULL;
 static const char *sshpam_password = NULL;
+static char badpw[] = "\b\n\r\177INCORRECT";
 
 /* Some PAM implementations don't implement this */
 #ifndef HAVE_PAM_GETENVLIST
@@ -254,7 +272,7 @@ import_environments(Buffer *b)
 
        debug3("PAM: %s entering", __func__);
 
-#ifndef USE_POSIX_THREADS
+#ifndef UNSUPPORTED_POSIX_THREADS_HACK
        /* Import variables set by do_pam_account */
        sshpam_account_status = buffer_get_int(b);
        sshpam_password_change_required(buffer_get_int(b));
@@ -289,7 +307,7 @@ import_environments(Buffer *b)
  * Conversation function for authentication thread.
  */
 static int
-sshpam_thread_conv(int n, struct pam_message **msg,
+sshpam_thread_conv(int n, sshpam_const struct pam_message **msg,
     struct pam_response **resp, void *data)
 {
        Buffer buffer;
@@ -383,13 +401,15 @@ sshpam_thread(void *ctxtp)
        struct pam_conv sshpam_conv;
        int flags = (options.permit_empty_passwd == 0 ?
            PAM_DISALLOW_NULL_AUTHTOK : 0);
-#ifndef USE_POSIX_THREADS
+#ifndef UNSUPPORTED_POSIX_THREADS_HACK
        extern char **environ;
        char **env_from_pam;
        u_int i;
        const char *pam_user;
+       const char **ptr_pam_user = &pam_user;
 
-       pam_get_item(sshpam_handle, PAM_USER, (void **)&pam_user);
+       pam_get_item(sshpam_handle, PAM_USER,
+           (sshpam_const void **)ptr_pam_user);
        environ[0] = NULL;
 
        if (sshpam_authctxt != NULL) {
@@ -427,7 +447,7 @@ sshpam_thread(void *ctxtp)
 
        buffer_put_cstring(&buffer, "OK");
 
-#ifndef USE_POSIX_THREADS
+#ifndef UNSUPPORTED_POSIX_THREADS_HACK
        /* Export variables set by do_pam_account */
        buffer_put_int(&buffer, sshpam_account_status);
        buffer_put_int(&buffer, sshpam_authctxt->force_pwchange);
@@ -446,7 +466,7 @@ sshpam_thread(void *ctxtp)
        buffer_put_int(&buffer, i);
        for(i = 0; env_from_pam != NULL && env_from_pam[i] != NULL; i++)
                buffer_put_cstring(&buffer, env_from_pam[i]);
-#endif /* USE_POSIX_THREADS */
+#endif /* UNSUPPORTED_POSIX_THREADS_HACK */
 
        /* XXX - can't do much about an error here */
        ssh_msg_send(ctxt->pam_csock, sshpam_err, &buffer);
@@ -481,7 +501,7 @@ sshpam_thread_cleanup(void)
 }
 
 static int
-sshpam_null_conv(int n, struct pam_message **msg,
+sshpam_null_conv(int n, sshpam_const struct pam_message **msg,
     struct pam_response **resp, void *data)
 {
        debug3("PAM: %s entering, %d messages", __func__, n);
@@ -491,7 +511,7 @@ sshpam_null_conv(int n, struct pam_message **msg,
 static struct pam_conv null_conv = { sshpam_null_conv, NULL };
 
 static int
-sshpam_store_conv(int n, struct pam_message **msg,
+sshpam_store_conv(int n, sshpam_const struct pam_message **msg,
     struct pam_response **resp, void *data)
 {
        struct pam_response *reply;
@@ -560,11 +580,12 @@ sshpam_init(Authctxt *authctxt)
 {
        extern char *__progname;
        const char *pam_rhost, *pam_user, *user = authctxt->user;
+       const char **ptr_pam_user = &pam_user;
 
        if (sshpam_handle != NULL) {
                /* We already have a PAM context; check if the user matches */
                sshpam_err = pam_get_item(sshpam_handle,
-                   PAM_USER, (void **)&pam_user);
+                   PAM_USER, (sshpam_const void **)ptr_pam_user);
                if (sshpam_err == PAM_SUCCESS && strcmp(user, pam_user) == 0)
                        return (0);
                pam_end(sshpam_handle, sshpam_err);
@@ -701,6 +722,12 @@ sshpam_query(void *ctx, char **name, char **info,
                                **prompts = NULL;
                        }
                        if (type == PAM_SUCCESS) {
+                               if (!sshpam_authctxt->valid ||
+                                   (sshpam_authctxt->pw->pw_uid == 0 &&
+                                   options.permit_root_login != PERMIT_YES))
+                                       fatal("Internal error: PAM auth "
+                                           "succeeded when it should have "
+                                           "failed");
                                import_environments(&buffer);
                                *num = 0;
                                **echo_on = 0;
@@ -746,7 +773,12 @@ sshpam_respond(void *ctx, u_int num, char **resp)
                return (-1);
        }
        buffer_init(&buffer);
-       buffer_put_cstring(&buffer, *resp);
+       if (sshpam_authctxt->valid &&
+           (sshpam_authctxt->pw->pw_uid != 0 ||
+            options.permit_root_login == PERMIT_YES))
+               buffer_put_cstring(&buffer, *resp);
+       else
+               buffer_put_cstring(&buffer, badpw);
        if (ssh_msg_send(ctxt->pam_psock, PAM_AUTHTOK, &buffer) == -1) {
                buffer_free(&buffer);
                return (-1);
@@ -869,7 +901,7 @@ do_pam_setcred(int init)
 }
 
 static int
-sshpam_tty_conv(int n, struct pam_message **msg,
+sshpam_tty_conv(int n, sshpam_const struct pam_message **msg,
     struct pam_response **resp, void *data)
 {
        char input[PAM_MAX_MSG_SIZE];
@@ -1028,7 +1060,7 @@ free_pam_environment(char **env)
  * display.
  */
 static int
-sshpam_passwd_conv(int n, struct pam_message **msg,
+sshpam_passwd_conv(int n, sshpam_const struct pam_message **msg,
     struct pam_response **resp, void *data)
 {
        struct pam_response *reply;
@@ -1093,7 +1125,6 @@ sshpam_auth_passwd(Authctxt *authctxt, const char *password)
 {
        int flags = (options.permit_empty_passwd == 0 ?
            PAM_DISALLOW_NULL_AUTHTOK : 0);
-       static char badpw[] = "\b\n\r\177INCORRECT";
 
        if (!options.use_pam || sshpam_handle == NULL)
                fatal("PAM: %s called when PAM disabled or failed to "