openssh-4.3p2-hpn12.diff

[gssapi-openssh.git] / openssh / auth-pam.c

diff --git a/openssh/auth-pam.c b/openssh/auth-pam.c
index 0b79f3a25fcd7fef23e7e9e0657a157db13a277c..8ff3320d30f44cfcff3f234e4519b2c5bc47e715 100644 (file)
--- a/openssh/auth-pam.c
+++ b/openssh/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.
  */
@@ -106,14 +123,14 @@ static struct pam_ctxt *cleanup_ctxt;
 static int sshpam_thread_status = -1;
 static mysig_t sshpam_oldsig;
 
-static void 
+static void
 sshpam_sigchld_handler(int sig)
 {
        signal(SIGCHLD, SIG_DFL);
        if (cleanup_ctxt == NULL)
                return; /* handler called after PAM cleanup, shouldn't happen */
        if (waitpid(cleanup_ctxt->pam_thread, &sshpam_thread_status, WNOHANG)
-            <= 0) {
+           <= 0) {
                /* PAM thread has not exitted, privsep slave must have */
                kill(cleanup_ctxt->pam_thread, SIGTERM);
                if (waitpid(cleanup_ctxt->pam_thread, &sshpam_thread_status, 0)
@@ -140,6 +157,7 @@ pthread_create(sp_pthread_t *thread, const void *attr __unused,
     void *(*thread_start)(void *), void *arg)
 {
        pid_t pid;
+       struct pam_ctxt *ctx = arg;
 
        sshpam_thread_status = -1;
        switch ((pid = fork())) {
@@ -147,10 +165,14 @@ pthread_create(sp_pthread_t *thread, const void *attr __unused,
                error("fork(): %s", strerror(errno));
                return (-1);
        case 0:
+               close(ctx->pam_psock);
+               ctx->pam_psock = -1;
                thread_start(arg);
                _exit(1);
        default:
                *thread = pid;
+               close(ctx->pam_csock);
+               ctx->pam_csock = -1;
                sshpam_oldsig = signal(SIGCHLD, sshpam_sigchld_handler);
                return (0);
        }
@@ -255,7 +277,7 @@ 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));
@@ -290,7 +312,7 @@ 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;
@@ -384,13 +406,15 @@ 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) {
@@ -428,7 +452,7 @@ 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);
@@ -447,7 +471,7 @@ 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);
@@ -482,7 +506,7 @@ 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);
@@ -492,7 +516,7 @@ 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;
@@ -561,11 +585,12 @@ 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);
@@ -691,8 +716,18 @@ sshpam_query(void *ctx, char **name, char **info,
                        plen++;
                        xfree(msg);
                        break;
-               case PAM_SUCCESS:
                case PAM_AUTH_ERR:
+                       debug3("PAM: PAM_AUTH_ERR");
+                       if (**prompts != NULL && strlen(**prompts) != 0) {
+                               *info = **prompts;
+                               **prompts = NULL;
+                               *num = 0;
+                               **echo_on = 0;
+                               ctxt->pam_done = -1;
+                               return 0;
+                       }
+                       /* FALLTHROUGH */
+               case PAM_SUCCESS:
                        if (**prompts != NULL) {
                                /* drain any accumulated messages */
                                debug("PAM: %s", **prompts);
@@ -738,7 +773,7 @@ sshpam_respond(void *ctx, u_int num, char **resp)
        Buffer buffer;
        struct pam_ctxt *ctxt = ctx;
 
-       debug2("PAM: %s entering, %d responses", __func__, num);
+       debug2("PAM: %s entering, %u responses", __func__, num);
        switch (ctxt->pam_done) {
        case 1:
                sshpam_authenticated = 1;
@@ -755,7 +790,7 @@ sshpam_respond(void *ctx, u_int num, char **resp)
        buffer_init(&buffer);
        if (sshpam_authctxt->valid &&
            (sshpam_authctxt->pw->pw_uid != 0 ||
-            options.permit_root_login == PERMIT_YES))
+           options.permit_root_login == PERMIT_YES))
                buffer_put_cstring(&buffer, *resp);
        else
                buffer_put_cstring(&buffer, badpw);
@@ -828,7 +863,7 @@ do_pam_account(void)
        sshpam_err = pam_acct_mgmt(sshpam_handle, 0);
        debug3("PAM: %s pam_acct_mgmt = %d (%s)", __func__, sshpam_err,
            pam_strerror(sshpam_handle, sshpam_err));
-       
+
        if (sshpam_err != PAM_SUCCESS && sshpam_err != PAM_NEW_AUTHTOK_REQD) {
                sshpam_account_status = 0;
                return (sshpam_account_status);
@@ -881,7 +916,7 @@ 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];
@@ -1040,7 +1075,7 @@ 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;
@@ -1086,7 +1121,7 @@ sshpam_passwd_conv(int n, struct pam_message **msg,
        *resp = reply;
        return (PAM_SUCCESS);
 
- fail: 
+ fail:
        for(i = 0; i < n; i++) {
                if (reply[i].resp != NULL)
                        xfree(reply[i].resp);
@@ -1119,7 +1154,7 @@ sshpam_auth_passwd(Authctxt *authctxt, const char *password)
         * information via timing (eg if the PAM config has a delay on fail).
         */
        if (!authctxt->valid || (authctxt->pw->pw_uid == 0 &&
-            options.permit_root_login != PERMIT_YES))
+           options.permit_root_login != PERMIT_YES))
                sshpam_password = badpw;
 
        sshpam_err = pam_set_item(sshpam_handle, PAM_CONV,
@@ -1133,7 +1168,7 @@ sshpam_auth_passwd(Authctxt *authctxt, const char *password)
        if (sshpam_err == PAM_SUCCESS && authctxt->valid) {
                debug("PAM: password authentication accepted for %.100s",
                    authctxt->user);
-               return 1;
+               return 1;
        } else {
                debug("PAM: password authentication failed for %.100s: %s",
                    authctxt->valid ? authctxt->user : "an illegal user",