Adding upstream version 1.5.2.upstream/1.5.2upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

19 files changed, 4183 insertions, 0 deletions

diff --git a/libpamc/License b/libpamc/License
new file mode 100644
index 0000000..9316078
--- /dev/null
+++ b/libpamc/License
@@ -0,0 +1,41 @@
+Unless otherwise *explicitly* stated the following text describes the
+licensed conditions under which the contents of this libpamc release
+may be distributed:
+
+-------------------------------------------------------------------------
+Redistribution and use in source and binary forms of libpamc,
+with or without modification, are permitted provided that the
+following conditions are met:
+
+1. Redistributions of source code must retain any existing copyright
+   notice, and this entire permission notice in its entirety,
+   including the disclaimer of warranties.
+
+2. Redistributions in binary form must reproduce all prior and current
+   copyright notices, this list of conditions, and the following
+   disclaimer in the documentation and/or other materials provided
+   with the distribution.
+
+3. The name of any author may not be used to endorse or promote
+   products derived from this software without their specific prior
+   written permission.
+
+ALTERNATIVELY, this product may be distributed under the terms of the
+GNU Library General Public License (LGPL), in which case the
+provisions of the GNU LGPL are required INSTEAD OF the above
+restrictions.  (This clause is necessary due to a potential conflict
+between the GNU LGPL and the restrictions contained in a BSD-style
+copyright.)
+
+THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
+WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT,
+INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
+TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
+USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
+DAMAGE.
+-------------------------------------------------------------------------
diff --git a/libpamc/Makefile.am b/libpamc/Makefile.am
new file mode 100644
index 0000000..2ebeadc
--- /dev/null
+++ b/libpamc/Makefile.am
@@ -0,0 +1,28 @@
+#
+# Copyright (c) 2005 Thorsten Kukuk <kukuk@suse.de>
+#
+
+SUBDIRS = test
+
+CLEANFILES = *~
+
+EXTRA_DIST = License libpamc.map
+
+include_HEADERS = include/security/pam_client.h
+
+noinst_HEADERS = libpamc.h
+
+AM_CFLAGS=-I$(top_srcdir)/libpam/include -I$(srcdir)/include $(WARN_CFLAGS)
+
+libpamc_la_LDFLAGS = -no-undefined -version-info 82:1:82
+if HAVE_VERSIONING
+  libpamc_la_LDFLAGS += -Wl,--version-script=$(srcdir)/libpamc.map
+endif
+
+lib_LTLIBRARIES = libpamc.la
+
+libpamc_la_SOURCES = pamc_client.c pamc_converse.c pamc_load.c
+
+# Pkg-config script.
+pkgconfigdir = $(libdir)/pkgconfig
+pkgconfig_DATA = pamc.pc
diff --git a/libpamc/Makefile.in b/libpamc/Makefile.in
new file mode 100644
index 0000000..424c175
--- /dev/null
+++ b/libpamc/Makefile.in
@@ -0,0 +1,924 @@
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diff --git a/libpamc/include/security/pam_client.h b/libpamc/include/security/pam_client.h
new file mode 100644
index 0000000..41f83da
--- /dev/null
+++ b/libpamc/include/security/pam_client.h
@@ -0,0 +1,197 @@
+/*
+ * $Id$
+ *
+ * Copyright (c) 1999 Andrew G. Morgan <morgan@linux.kernel.org>
+ *
+ * This header file provides the prototypes for the PAM client API
+ */
+
+#ifndef PAM_CLIENT_H
+#define PAM_CLIENT_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif /* def __cplusplus */
+
+#include <unistd.h>
+#include <string.h>
+#include <stdio.h>
+#include <stdint.h>
+#include <sys/types.h>
+
+/* opaque agent handling structure */
+
+typedef struct pamc_handle_s *pamc_handle_t;
+
+/* binary prompt structure pointer */
+typedef struct { uint32_t length; uint8_t control; } *pamc_bp_t;
+
+/*
+ * functions provided by libpamc
+ */
+
+/*
+ * Initialize the agent abstraction library
+ */
+
+pamc_handle_t pamc_start(void);
+
+/*
+ * Terminate the authentication process
+ */
+
+int pamc_end(pamc_handle_t *pch);
+
+/*
+ * force the loading of a specified agent
+ */
+
+int pamc_load(pamc_handle_t pch, const char *agent_id);
+
+/*
+ * Single conversation interface for binary prompts
+ */
+
+int pamc_converse(pamc_handle_t pch, pamc_bp_t *prompt_p);
+
+/*
+ * disable an agent
+ */
+
+int pamc_disable(pamc_handle_t pch, const char *agent_id);
+
+/*
+ * obtain a list of available agents
+ */
+
+char **pamc_list_agents(pamc_handle_t pch);
+
+/*
+ * PAM_BP_ MACROS for creating, destroying and manipulating binary prompts
+ */
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <unistd.h>
+
+#ifndef PAM_BP_ASSERT
+# ifdef NDEBUG
+#  define PAM_BP_ASSERT(x)   do {} while (0)
+# else
+#  define PAM_BP_ASSERT(x)   do { printf(__FILE__ "(%d): %s\n", \
+					 __LINE__, x) ; exit(1); } while (0)
+# endif /* NDEBUG */
+#endif /* PAM_BP_ASSERT */
+
+#ifndef PAM_BP_CALLOC
+# define PAM_BP_CALLOC      calloc
+#endif /* PAM_BP_CALLOC */
+
+#ifndef PAM_BP_FREE
+# define PAM_BP_FREE        free
+#endif /* PAM_BP_FREE */
+
+#define __PAM_BP_WOCTET(x,y)  (*((y) + (uint8_t *)(x)))
+#define __PAM_BP_ROCTET(x,y)  (*((y) + (const uint8_t *)(x)))
+
+#define PAM_BP_MIN_SIZE       (sizeof(uint32_t) + sizeof(uint8_t))
+#define PAM_BP_MAX_LENGTH     0x20000                   /* an advisory limit */
+#define PAM_BP_WCONTROL(x)    (__PAM_BP_WOCTET(x,4))
+#define PAM_BP_RCONTROL(x)    (__PAM_BP_ROCTET(x,4))
+#define PAM_BP_SIZE(x)        ((__PAM_BP_ROCTET(x,0)<<24)+      \
+			       (__PAM_BP_ROCTET(x,1)<<16)+      \
+			       (__PAM_BP_ROCTET(x,2)<< 8)+      \
+			       (__PAM_BP_ROCTET(x,3)    ))
+#define PAM_BP_LENGTH(x)      (PAM_BP_SIZE(x) - PAM_BP_MIN_SIZE)
+#define PAM_BP_WDATA(x)       (PAM_BP_MIN_SIZE + (uint8_t *) (x))
+#define PAM_BP_RDATA(x)       (PAM_BP_MIN_SIZE + (const uint8_t *) (x))
+
+/* Note, this macro always '\0' terminates renewed packets */
+
+#define PAM_BP_RENEW(old_p, cntrl, data_length)                            \
+do {                                                                       \
+    if ((old_p) != NULL) {                                                 \
+	if (*(old_p)) {                                                    \
+	    uint32_t __size;                                              \
+            __size = PAM_BP_SIZE(*(old_p));                                \
+	    memset(*(old_p), 0, __size);                                   \
+	    PAM_BP_FREE(*(old_p));                                         \
+	}                                                                  \
+	if (cntrl) {                                                       \
+	    uint32_t __size;                                              \
+                                                                           \
+	    __size = PAM_BP_MIN_SIZE + data_length;                        \
+	    if ((*(old_p) = PAM_BP_CALLOC(1, 1+__size))) {                 \
+		__PAM_BP_WOCTET(*(old_p), 3) =  __size      & 0xFF;        \
+		__PAM_BP_WOCTET(*(old_p), 2) = (__size>>=8) & 0xFF;        \
+		__PAM_BP_WOCTET(*(old_p), 1) = (__size>>=8) & 0xFF;        \
+		__PAM_BP_WOCTET(*(old_p), 0) = (__size>>=8) & 0xFF;        \
+		(*(old_p))->control = cntrl;                               \
+	    } else {                                                       \
+		PAM_BP_ASSERT("out of memory for binary prompt");          \
+	    }                                                              \
+	} else {                                                           \
+	    *old_p = NULL;                                                 \
+	}                                                                  \
+    } else {                                                               \
+	PAM_BP_ASSERT("programming error, invalid binary prompt pointer"); \
+    }                                                                      \
+} while (0)
+
+#define PAM_BP_FILL(prmpt, offset, length, data)                           \
+do {                                                                       \
+    size_t bp_length;                                                      \
+    uint8_t *prompt = (uint8_t *) (prmpt);                               \
+    bp_length = PAM_BP_LENGTH(prompt);                                     \
+    if (bp_length < ((length)+(offset))) {                                 \
+	PAM_BP_ASSERT("attempt to write over end of prompt");              \
+    }                                                                      \
+    memcpy((offset) + PAM_BP_WDATA(prompt), (data), (length));             \
+} while (0)
+
+#define PAM_BP_EXTRACT(prmpt, offset, length, data)                        \
+do {                                                                       \
+    size_t __bp_length;                                                    \
+    const uint8_t *__prompt = (const uint8_t *) (prmpt);                 \
+    __bp_length = PAM_BP_LENGTH(__prompt);                                 \
+    if (((offset) < 0) || (__bp_length < ((length)+(offset)))              \
+	|| ((length) < 0)) {                                               \
+	PAM_BP_ASSERT("invalid extraction from prompt");                   \
+    }                                                                      \
+    memcpy((data), (offset) + PAM_BP_RDATA(__prompt), (length));           \
+} while (0)
+
+
+/* Control types */
+
+#define PAM_BPC_FALSE   0
+#define PAM_BPC_TRUE    1
+
+#define PAM_BPC_OK      0x01   /* continuation packet   */
+#define PAM_BPC_SELECT  0x02   /* initialization packet */
+#define PAM_BPC_DONE    0x03   /* termination packet    */
+#define PAM_BPC_FAIL    0x04   /* unable to execute     */
+
+/* The following control characters are only legal for echanges
+   between an agent and a client (it is the responsibility of the
+   client to enforce this rule in the face of a rogue server): */
+
+#define PAM_BPC_GETENV  0x41   /* obtain client env.var */
+#define PAM_BPC_PUTENV  0x42   /* set client env.var    */
+#define PAM_BPC_TEXT    0x43   /* display message       */
+#define PAM_BPC_ERROR   0x44   /* display error message */
+#define PAM_BPC_PROMPT  0x45   /* echo'd text prompt    */
+#define PAM_BPC_PASS    0x46   /* non-echo'd text prompt*/
+
+/* quick check for prompts that are legal for the client (by
+   implication the server too) to send to libpamc */
+
+#define PAM_BPC_FOR_CLIENT(/* pamc_bp_t */ prompt)                            \
+    (((prompt)->control <= PAM_BPC_FAIL && (prompt)->control >= PAM_BPC_OK)   \
+     ? PAM_BPC_TRUE:PAM_BPC_FALSE)
+
+#ifdef __cplusplus
+}
+#endif /* def __cplusplus */
+
+#endif /* PAM_CLIENT_H */
diff --git a/libpamc/libpamc.h b/libpamc/libpamc.h
new file mode 100644
index 0000000..cdc7724
--- /dev/null
+++ b/libpamc/libpamc.h
@@ -0,0 +1,66 @@
+/*
+ * $Id$
+ *
+ * Copyright (c) Andrew G. Morgan <morgan@ftp.kernel.org>
+ *
+ */
+
+#ifndef LIBPAMC_H
+#define LIBPAMC_H
+
+#include "config.h"
+
+#include <security/pam_client.h>
+#include <security/_pam_macros.h>
+
+#include <sys/stat.h>
+#include <unistd.h>
+#include <sys/types.h>
+#include <dirent.h>
+#include <sys/wait.h>
+#include <stdint.h>
+#include <stdlib.h>
+#include <errno.h>
+#include <ctype.h>
+
+#define _PAMC_DEFAULT_TOP_FD  10
+
+struct pamc_handle_s {
+    struct pamc_agent_s *current;
+    struct pamc_agent_s *chain;
+    struct pamc_blocked_s *blocked_agents;
+    int max_path;
+    char **agent_paths;
+    int combined_status;
+    int highest_fd_to_close;
+};
+
+typedef struct pamc_blocked_s {
+    char *id;                       /* <NUL> terminated */
+    struct pamc_blocked_s *next;
+} pamc_blocked_t;
+
+typedef struct pamc_agent_s {
+    char *id;
+    int id_length;
+    struct pamc_agent_s *next;
+    int writer;   /* write to agent */
+    int reader;   /* read from agent */
+    pid_t pid;    /* agent process id */
+} pamc_agent_t;
+
+/* used to build a tree of unique, sorted agent ids */
+
+typedef struct pamc_id_node {
+    struct pamc_id_node *left, *right;
+    int child_count;
+    char *agent_id;
+} pamc_id_node_t;
+
+/* internal function */
+int __pamc_valid_agent_id(int id_length, const char *id);
+
+#define PAMC_SYSTEM_AGENT_PATH        "/lib/pamc:/usr/lib/pamc"
+#define PAMC_SYSTEM_AGENT_SEPARATOR   ':'
+
+#endif /* LIBPAMC_H */
diff --git a/libpamc/libpamc.map b/libpamc/libpamc.map
new file mode 100644
index 0000000..cc61a33
--- /dev/null
+++ b/libpamc/libpamc.map
@@ -0,0 +1,12 @@
+LIBPAMC_1.0 {
+  global:
+    pamc_start;
+    pamc_end;
+    pamc_load;
+    pamc_converse;
+    pamc_disable;
+    pamc_list_agents;
+
+  local:
+    *;
+};
diff --git a/libpamc/pamc.pc.in b/libpamc/pamc.pc.in
new file mode 100644
index 0000000..25a6385
--- /dev/null
+++ b/libpamc/pamc.pc.in
@@ -0,0 +1,9 @@
+libdir=@libdir@
+includedir=@includedir@
+
+Name: libpamc
+URL: http://www.linux-pam.org/
+Description: The PAM client API library and binary prompt support. Rarely used.
+Version: @VERSION@
+Cflags: -I${includedir}
+Libs: -L${libdir} -lpamc
diff --git a/libpamc/pamc_client.c b/libpamc/pamc_client.c
new file mode 100644
index 0000000..175f424
--- /dev/null
+++ b/libpamc/pamc_client.c
@@ -0,0 +1,189 @@
+/*
+ * $Id$
+ *
+ * Copyright (c) Andrew G. Morgan <morgan@ftp.kernel.org>
+ *
+ * pamc_start and pamc_end
+ */
+
+#include "libpamc.h"
+
+/*
+ * liberate path list
+ */
+
+static void __pamc_delete_path_list(pamc_handle_t pch)
+{
+    int i;
+
+    for (i=0; pch->agent_paths[i]; ++i) {
+	free(pch->agent_paths[i]);
+	pch->agent_paths[i] = NULL;
+    }
+
+    free(pch->agent_paths);
+    pch->agent_paths = NULL;
+}
+
+/*
+ * open the pamc library
+ */
+
+pamc_handle_t pamc_start(void)
+{
+    int i, count, last, this;
+    const char *default_path;
+    pamc_handle_t pch;
+
+    pch = calloc(1, sizeof(struct pamc_handle_s));
+    if (pch == NULL) {
+	D(("no memory for *pch"));
+	return NULL;
+    }
+
+    pch->highest_fd_to_close = _PAMC_DEFAULT_TOP_FD;
+
+    default_path = getenv("PAMC_AGENT_PATH");
+    if (default_path == NULL) {
+	default_path = PAMC_SYSTEM_AGENT_PATH;
+    }
+
+    /* number of individual paths */
+    for (count=1, i=0; default_path[i]; ++i) {
+	if (default_path[i] == PAMC_SYSTEM_AGENT_SEPARATOR) {
+	    ++count;
+	}
+    }
+
+    pch->agent_paths = calloc(count+1, sizeof(char *));
+    if (pch->agent_paths == NULL) {
+	D(("no memory for path list"));
+	goto drop_pch;
+    }
+
+    this = last = i = 0;
+    while ( default_path[i] || (i != last) ) {
+	if ( default_path[i] == PAMC_SYSTEM_AGENT_SEPARATOR
+	     || !default_path[i] ) {
+	    int length;
+
+	    pch->agent_paths[this] = malloc(length = 1+i-last);
+
+	    if (pch->agent_paths[this] == NULL) {
+		D(("no memory for next path"));
+		goto drop_list;
+	    }
+
+	    memcpy(pch->agent_paths[this], default_path + last, i-last);
+	    pch->agent_paths[this][i-last] = '\0';
+	    if (length > pch->max_path) {
+		pch->max_path = length;
+	    }
+
+	    if (++this == count) {
+		break;
+	    }
+
+	    last = ++i;
+	} else {
+	    ++i;
+	}
+    }
+
+    return pch;
+
+drop_list:
+    __pamc_delete_path_list(pch);
+
+drop_pch:
+    free(pch);
+
+    return NULL;
+}
+
+/*
+ * shutdown each of the loaded agents and
+ */
+
+static int __pamc_shutdown_agents(pamc_handle_t pch)
+{
+    int retval = PAM_BPC_TRUE;
+
+    D(("called"));
+
+    while (pch->chain) {
+	pid_t pid;
+	int status;
+	pamc_agent_t *this;
+
+	this = pch->chain;
+	D(("cleaning up agent %p", this));
+	pch->chain = pch->chain->next;
+	this->next = NULL;
+	D(("cleaning up agent: %s", this->id));
+
+	/* close off contact with agent and wait for it to shutdown */
+
+	close(this->writer);
+	this->writer = -1;
+	close(this->reader);
+	this->reader = -1;
+
+	pid = waitpid(this->pid, &status, 0);
+	if (pid == this->pid) {
+
+	    D(("is exit:%d, exit val:%d",
+	       WIFEXITED(status), WEXITSTATUS(status)));
+
+	    if (!(WIFEXITED(status) && (WEXITSTATUS(status) == 0))) {
+		retval = PAM_BPC_FALSE;
+	    }
+	} else {
+	    D(("problem shutting down agent (%s): pid(%d) != waitpid(%d)!?",
+	       this->id, this->pid, pid));
+	    retval = PAM_BPC_FALSE;
+	}
+	pid = this->pid = 0;
+
+	memset(this->id, 0, this->id_length);
+	free(this->id);
+	this->id = NULL;
+	this->id_length = 0;
+
+	free(this);
+	this = NULL;
+    }
+
+    return retval;
+}
+
+/*
+ * close the pamc library
+ */
+
+int pamc_end(pamc_handle_t *pch_p)
+{
+    int retval;
+
+    if (pch_p == NULL) {
+	D(("called with no pch_p"));
+	return PAM_BPC_FALSE;
+    }
+
+    if (*pch_p == NULL) {
+	D(("called with no *pch_p"));
+	return PAM_BPC_FALSE;
+    }
+
+    D(("removing path_list"));
+    __pamc_delete_path_list(*pch_p);
+
+    D(("shutting down agents"));
+    retval = __pamc_shutdown_agents(*pch_p);
+
+    D(("freeing *pch_p"));
+    free(*pch_p);
+    *pch_p = NULL;
+
+    return retval;
+}
diff --git a/libpamc/pamc_converse.c b/libpamc/pamc_converse.c
new file mode 100644
index 0000000..f8f60ed
--- /dev/null
+++ b/libpamc/pamc_converse.c
@@ -0,0 +1,211 @@
+/*
+ * $Id$
+ *
+ * Copyright (c) Andrew G. Morgan <morgan@ftp.kernel.org>
+ *
+ * pamc_converse
+ */
+
+#include "libpamc.h"
+
+/*
+ * select agent
+ */
+
+static int __pamc_select_agent(pamc_handle_t pch, char *agent_id)
+{
+    pamc_agent_t *agent;
+
+    for (agent = pch->chain; agent; agent = agent->next) {
+	if (!strcmp(agent->id, agent_id)) {
+	    pch->current = agent;
+	    return PAM_BPC_TRUE;
+	}
+    }
+
+    D(("failed to locate agent"));
+    pch->current = NULL;
+    return PAM_BPC_FALSE;
+}
+
+/*
+ * pass a binary prompt to the active agent and wait for a reply prompt
+ */
+
+int pamc_converse(pamc_handle_t pch, pamc_bp_t *prompt_p)
+{
+    uint32_t size, offset=0;
+    uint8_t control, raw[PAM_BP_MIN_SIZE];
+
+    D(("called"));
+
+    if (pch == NULL) {
+	D(("null pch"));
+	goto pamc_converse_failure;
+    }
+
+    if (prompt_p == NULL) {
+	D(("null prompt_p"));
+	goto pamc_converse_failure;
+    }
+
+    if (*prompt_p == NULL) {
+	D(("null *prompt_p"));
+	goto pamc_converse_failure;
+    }
+
+    /* from here on, failures are interoperability problems.. */
+
+    size = PAM_BP_SIZE(*prompt_p);
+    if (size < PAM_BP_MIN_SIZE) {
+	D(("problem with size being too short (%u)", size));
+	goto pamc_unknown_prompt;
+    }
+
+    if (PAM_BPC_FOR_CLIENT(*prompt_p) != PAM_BPC_TRUE) {
+	D(("*prompt_p is not legal for the client to use"));
+	goto pamc_unknown_prompt;
+    }
+
+    /* do we need to select the agent? */
+    if ((*prompt_p)->control == PAM_BPC_SELECT) {
+	char *rawh;
+	size_t i;
+	int retval;
+
+	D(("selecting a specified agent"));
+
+	rawh = (char *) *prompt_p;
+	for (i = PAM_BP_MIN_SIZE; i<size; ++i) {
+	    if (rawh[i] == '/') {
+		break;
+	    }
+	}
+
+	if ( (i >= size)
+	     || !__pamc_valid_agent_id(i-PAM_BP_MIN_SIZE,
+				       rawh + PAM_BP_MIN_SIZE) ) {
+	    goto pamc_unknown_prompt;
+	}
+
+	rawh[i] = '\0';
+	retval = pamc_load(pch, PAM_BP_MIN_SIZE + rawh);
+	if (retval == PAM_BPC_TRUE) {
+	    retval = __pamc_select_agent(pch, PAM_BP_MIN_SIZE + rawh);
+	}
+	rawh[i] = '/';
+
+	if (retval != PAM_BPC_TRUE) {
+	    goto pamc_unknown_prompt;
+	}
+
+	D(("agent is loaded"));
+    }
+
+    if (pch->current == NULL) {
+	D(("unable to address agent"));
+	goto pamc_unknown_prompt;
+    }
+
+    /* pump all of the prompt into the agent */
+    do {
+	int rval = write(pch->current->writer,
+			 offset + (const uint8_t *) (*prompt_p),
+			 size - offset);
+	if (rval == -1) {
+	    switch (errno) {
+	    case EINTR:
+		break;
+	    default:
+		D(("problem writing to agent: %m"));
+		goto pamc_unknown_prompt;
+	    }
+	} else {
+	    offset += rval;
+	}
+    } while (offset < size);
+
+    D(("whole prompt sent to agent"));
+
+    /* read size and control for response prompt */
+
+    offset = 0;
+    memset(raw, 0, sizeof(raw));
+    do {
+	int rval;
+
+	rval = read(pch->current->reader, raw + offset,
+		    PAM_BP_MIN_SIZE - offset);
+
+	if (rval == -1) {
+	    switch (errno) {
+	    case EINTR:
+		break;
+	    default:
+		D(("problem reading from agent: %m"));
+		goto pamc_unknown_prompt;
+	    }
+	} else if (rval) {
+	    offset += rval;
+	} else {
+	    D(("agent has closed its output pipe - nothing more to read"));
+	    goto pamc_converse_failure;
+	}
+    } while (offset < PAM_BP_MIN_SIZE);
+
+    /* construct the whole reply prompt */
+
+    size = PAM_BP_SIZE(raw);
+    control = PAM_BP_RCONTROL(raw);
+    memset(raw, 0, sizeof(raw));
+
+    D(("agent replied with prompt of size %d and control %u",
+       size, control));
+
+    PAM_BP_RENEW(prompt_p, control, size - PAM_BP_MIN_SIZE);
+    if (*prompt_p == NULL) {
+	D(("problem making a new prompt for reply"));
+	goto pamc_unknown_prompt;
+    }
+
+    /* read the rest of the reply prompt -- note offset has the correct
+       value from the previous loop */
+
+    while (offset < size) {
+	int rval = read(pch->current->reader, offset + (uint8_t *) *prompt_p,
+			size-offset);
+
+	if (rval == -1) {
+	    switch (errno) {
+	    case EINTR:
+		break;
+	    default:
+		D(("problem reading from agent: %m"));
+		goto pamc_unknown_prompt;
+	    }
+	} else if (rval) {
+	    offset += rval;
+	} else {
+	    D(("problem reading prompt (%d) with %d to go",
+	       size, size-offset));
+	    goto pamc_converse_failure;
+	}
+    }
+
+    D(("returning success"));
+
+    return PAM_BPC_TRUE;
+
+pamc_converse_failure:
+
+    D(("conversation failure"));
+    PAM_BP_RENEW(prompt_p, 0, 0);
+    return PAM_BPC_FALSE;
+
+pamc_unknown_prompt:
+
+    /* the server is trying something that the client does not support */
+    D(("unknown prompt"));
+    PAM_BP_RENEW(prompt_p, PAM_BPC_FAIL, 0);
+    return PAM_BPC_TRUE;
+}
diff --git a/libpamc/pamc_load.c b/libpamc/pamc_load.c
new file mode 100644
index 0000000..24a65df
--- /dev/null
+++ b/libpamc/pamc_load.c
@@ -0,0 +1,477 @@
+/*
+ * $Id$
+ *
+ * Copyright (c) 1999 Andrew G. Morgan <morgan@ftp.kernel.org>
+ *
+ * pamc_load
+ */
+
+#include "libpamc.h"
+
+static int __pamc_exec_agent(pamc_handle_t pch, pamc_agent_t *agent)
+{
+    char *full_path;
+    int found_agent, length, reset_length, to_agent[2], from_agent[2];
+    int return_code = PAM_BPC_FAIL;
+
+    if (agent->id[agent->id_length] != '\0') {
+	PAM_BP_ASSERT("libpamc: internal error agent_id not terminated");
+    }
+
+    for (length=0; (length < agent->id_length); ++length) {
+	switch (agent->id[length]) {
+	case '/':
+	    D(("ill formed agent id"));
+	    return PAM_BPC_FAIL;
+	}
+    }
+
+    /* enough memory for any path + this agent */
+    reset_length = 3 + pch->max_path + agent->id_length;
+    D(("reset_length = %d (3+%d+%d)",
+       reset_length, pch->max_path, agent->id_length));
+    full_path = malloc(reset_length);
+    if (full_path == NULL) {
+	D(("no memory for agent path"));
+	return PAM_BPC_FAIL;
+    }
+
+    found_agent = 0;
+    for (length=0; pch->agent_paths[length]; ++length) {
+	struct stat buf;
+
+	D(("path: [%s]", pch->agent_paths[length]));
+	D(("agent id: [%s]", agent->id));
+
+	sprintf(full_path, "%s/%s", pch->agent_paths[length], agent->id);
+
+	D(("looking for agent here: [%s]\n", full_path));
+	if (stat(full_path, &buf) == 0) {
+	    D(("file existis"));
+	    found_agent = 1;
+	    break;
+	}
+    }
+
+    if (! found_agent) {
+	D(("no agent was found"));
+	goto free_and_return;
+    }
+
+    if (pipe(to_agent)) {
+	D(("failed to open pipe to agent"));
+	goto free_and_return;
+    }
+
+    if (pipe(from_agent)) {
+	D(("failed to open pipe from agent"));
+	goto close_the_agent;
+    }
+
+    agent->pid = fork();
+    if (agent->pid == -1) {
+
+	D(("failed to fork for agent"));
+	goto close_both_pipes;
+
+    } else if (agent->pid == 0) {
+
+	int i;
+
+	dup2(from_agent[1], STDOUT_FILENO);
+	dup2(to_agent[0], STDIN_FILENO);
+
+	/* we close all of the files that have filedescriptors lower
+	   and equal to twice the highest we have seen, The idea is
+	   that we don't want to leak filedescriptors to agents from a
+	   privileged client application.
+
+	   XXX - this is a heuristic at this point. There is a growing
+	    need for an extra 'set param' libpamc function, that could
+	    be used to supply info like the highest fd to close etc..
+	*/
+
+	if (from_agent[1] > pch->highest_fd_to_close) {
+	    pch->highest_fd_to_close = 2*from_agent[1];
+	}
+
+	for (i=0; i <= pch->highest_fd_to_close; ++i) {
+	    switch (i) {
+	    case STDOUT_FILENO:
+	    case STDERR_FILENO:
+	    case STDIN_FILENO:
+		/* only these three remain open */
+		break;
+	    default:
+		(void) close(i); /* don't care if its not open */
+	    }
+	}
+
+	/* we make no attempt to drop other privileges - this library
+	   has no idea how that would be done in the general case. It
+	   is up to the client application (when calling
+	   pamc_converse) to make sure no privilege will leak into an
+	   (untrusted) agent. */
+
+	/* we propagate no environment - future versions of this
+           library may have the ability to audit all agent
+           transactions. */
+
+	D(("exec'ing agent %s", full_path));
+	execle(full_path, "pam-agent", NULL, NULL);
+
+	D(("exec failed"));
+	_exit(1);
+
+    }
+
+    close(to_agent[0]);
+    close(from_agent[1]);
+
+    agent->writer = to_agent[1];
+    agent->reader = from_agent[0];
+
+    return_code = PAM_BPC_TRUE;
+    goto free_and_return;
+
+close_both_pipes:
+    close(from_agent[0]);
+    close(from_agent[1]);
+
+close_the_agent:
+    close(to_agent[0]);
+    close(to_agent[1]);
+
+free_and_return:
+    memset(full_path, 0, reset_length);
+    free(full_path);
+
+    D(("returning %d", return_code));
+
+    return return_code;
+}
+
+/*
+ * has the named agent been loaded?
+ */
+
+static int __pamc_agent_is_enabled(pamc_handle_t pch, const char *agent_id)
+{
+    pamc_agent_t *agent;
+
+    for (agent = pch->chain; agent; agent = agent->next) {
+	if (!strcmp(agent->id, agent_id)) {
+	    D(("agent already loaded"));
+	    return PAM_BPC_TRUE;
+	}
+    }
+
+    D(("agent is not loaded"));
+    return PAM_BPC_FALSE;
+}
+
+/*
+ * has the named agent been disabled?
+ */
+
+static int __pamc_agent_is_disabled(pamc_handle_t pch, const char *agent_id)
+{
+    pamc_blocked_t *blocked;
+
+    for (blocked=pch->blocked_agents; blocked; blocked = blocked->next) {
+	if (!strcmp(agent_id, blocked->id)) {
+	    D(("agent is disabled"));
+	    return PAM_BPC_TRUE;
+	}
+    }
+
+    D(("agent is not disabled"));
+    return PAM_BPC_FALSE;
+}
+
+/*
+ * disable an agent
+ */
+
+int pamc_disable(pamc_handle_t pch, const char *agent_id)
+{
+    pamc_blocked_t *block;
+
+    if (pch == NULL) {
+	D(("pch is NULL"));
+	return PAM_BPC_FALSE;
+    }
+
+    if (agent_id == NULL) {
+	D(("agent_id is NULL"));
+	return PAM_BPC_FALSE;
+    }
+
+    if (__pamc_agent_is_enabled(pch, agent_id) != PAM_BPC_FALSE) {
+	D(("agent is already loaded"));
+	return PAM_BPC_FALSE;
+    }
+
+    if (__pamc_agent_is_disabled(pch, agent_id) != PAM_BPC_FALSE) {
+	D(("agent is already disabled"));
+	return PAM_BPC_TRUE;
+    }
+
+    block = calloc(1, sizeof(pamc_blocked_t));
+    if (block == NULL) {
+	D(("no memory for new blocking structure"));
+	return PAM_BPC_FALSE;
+    }
+
+    block->id =	malloc(1 + strlen(agent_id));
+    if (block->id == NULL) {
+	D(("no memory for agent id"));
+	free(block);
+	return PAM_BPC_FALSE;
+    }
+
+    strcpy(block->id, agent_id);
+    block->next = pch->blocked_agents;
+    pch->blocked_agents = block;
+
+    return PAM_BPC_TRUE;
+}
+
+/*
+ * force the loading of a particular agent
+ */
+
+int pamc_load(pamc_handle_t pch, const char *agent_id)
+{
+    pamc_agent_t *agent;
+    int length;
+
+    /* santity checking */
+
+    if (pch == NULL) {
+	D(("pch is NULL"));
+	return PAM_BPC_FALSE;
+    }
+
+    if (agent_id == NULL) {
+	D(("agent_id is NULL"));
+	return PAM_BPC_FALSE;
+    }
+
+    if (__pamc_agent_is_disabled(pch, agent_id) != PAM_BPC_FALSE) {
+	D(("sorry agent is disabled"));
+	return PAM_BPC_FALSE;
+    }
+
+    length = strlen(agent_id);
+
+    /* scan list to see if agent is loaded */
+
+    if (__pamc_agent_is_enabled(pch, agent_id) == PAM_BPC_TRUE) {
+	D(("no need to load an already loaded agent (%s)", agent_id));
+	return PAM_BPC_TRUE;
+    }
+
+    /* not in the list, so we need to load it and add it to the head
+       of the chain */
+
+    agent = calloc(1, sizeof(pamc_agent_t));
+    if (agent == NULL) {
+	D(("no memory for new agent"));
+	return PAM_BPC_FALSE;
+    }
+    agent->id = calloc(1, 1+length);
+    if (agent->id == NULL) {
+	D(("no memory for new agent's id"));
+	goto fail_free_agent;
+    }
+    memcpy(agent->id, agent_id, length);
+    agent->id[length] = '\0';
+    agent->id_length = length;
+
+    if (__pamc_exec_agent(pch, agent) != PAM_BPC_TRUE) {
+	D(("unable to exec agent"));
+	goto fail_free_agent_id;
+    }
+
+    agent->next = pch->chain;
+    pch->chain = agent;
+
+    return PAM_BPC_TRUE;
+
+fail_free_agent_id:
+
+    memset(agent->id, 0, agent->id_length);
+    free(agent->id);
+
+    memset(agent, 0, sizeof(*agent));
+
+fail_free_agent:
+
+    free(agent);
+    return PAM_BPC_FALSE;
+}
+
+/*
+ * what's a valid agent name?
+ */
+
+int __pamc_valid_agent_id(int id_length, const char *id)
+{
+    int post, i;
+
+    for (i=post=0 ; i < id_length; ++i) {
+	int ch = id[i++];
+
+	if (isalpha(ch) || isdigit(ch) || (ch == '_')) {
+	    continue;
+	} else if (post && (ch == '.')) {
+	    continue;
+	} else if ((i > 1) && (!post) && (ch == '@')) {
+	    post = 1;
+	} else {
+	    D(("id=%s contains '%c' which is illegal", id, ch));
+	    return 0;
+	}
+    }
+
+    if (!i) {
+	D(("length of id is 0"));
+	return 0;
+    } else {
+	return 1;                       /* id is valid */
+    }
+}
+
+/*
+ * building a tree of available agent names
+ */
+
+static pamc_id_node_t *__pamc_add_node(pamc_id_node_t *root, const char *id,
+				       int *counter)
+{
+    if (root) {
+
+	int cmp;
+
+	if ((cmp = strcmp(id, root->agent_id))) {
+	    if (cmp > 0) {
+		root->right = __pamc_add_node(root->right, id,
+					      &(root->child_count));
+	    } else {
+		root->left = __pamc_add_node(root->left, id,
+					     &(root->child_count));
+	    }
+	}
+
+	return root;
+
+    } else {
+
+	pamc_id_node_t *node = calloc(1, sizeof(pamc_id_node_t));
+
+	if (node) {
+	    node->agent_id = malloc(1+strlen(id));
+	    if (node->agent_id) {
+		strcpy(node->agent_id, id);
+	    } else {
+		free(node);
+		node = NULL;
+	    }
+	}
+
+	(*counter)++;
+	return node;
+    }
+}
+
+/*
+ * drop all of the tree and any remaining ids
+ */
+
+static pamc_id_node_t *__pamc_liberate_nodes(pamc_id_node_t *tree)
+{
+    if (tree) {
+	if (tree->agent_id) {
+	    free(tree->agent_id);
+	    tree->agent_id = NULL;
+	}
+
+	tree->left = __pamc_liberate_nodes(tree->left);
+	tree->right = __pamc_liberate_nodes(tree->right);
+
+	tree->child_count = 0;
+	free(tree);
+    }
+
+    return NULL;
+}
+
+/*
+ * fill a list with the contents of the tree (in ascii order)
+ */
+
+static void __pamc_fill_list_from_tree(pamc_id_node_t *tree, char **agent_list,
+				       int *counter)
+{
+    if (tree) {
+	__pamc_fill_list_from_tree(tree->left, agent_list, counter);
+	agent_list[(*counter)++] = tree->agent_id;
+	tree->agent_id = NULL;
+	__pamc_fill_list_from_tree(tree->right, agent_list, counter);
+    }
+}
+
+/*
+ * get a list of the available agents
+ */
+
+char **pamc_list_agents(pamc_handle_t pch)
+{
+    int i, total_agent_count=0;
+    pamc_id_node_t *tree = NULL;
+    char **agent_list;
+
+    /* loop over agent paths */
+
+    for (i=0; pch->agent_paths[i]; ++i) {
+	DIR *dir;
+
+	dir = opendir(pch->agent_paths[i]);
+	if (dir) {
+	    struct dirent *item;
+
+	    while ((item = readdir(dir))) {
+
+		/* this is a cheat on recognizing agent_ids */
+		if (!__pamc_valid_agent_id(strlen(item->d_name),
+					   item->d_name)) {
+		    continue;
+		}
+
+		tree = __pamc_add_node(tree, item->d_name, &total_agent_count);
+	    }
+
+	    closedir(dir);
+	}
+    }
+
+    /* now, we build a list of ids */
+    D(("total of %d available agents\n", total_agent_count));
+
+    agent_list = calloc(total_agent_count+1, sizeof(char *));
+    if (agent_list) {
+	int counter=0;
+
+	__pamc_fill_list_from_tree(tree, agent_list, &counter);
+	if (counter != total_agent_count) {
+	    PAM_BP_ASSERT("libpamc: internal error transcribing tree");
+	}
+    } else {
+	D(("no memory for agent list"));
+    }
+
+    __pamc_liberate_nodes(tree);
+
+    return agent_list;
+}
diff --git a/libpamc/test/Makefile.am b/libpamc/test/Makefile.am
new file mode 100644
index 0000000..fc0cac4
--- /dev/null
+++ b/libpamc/test/Makefile.am
@@ -0,0 +1,11 @@
+#
+# Copyright (c) 2005 Thorsten Kukuk <kukuk@suse.de>
+#
+
+AUTOMAKE_OPTIONS = 1.6 gnits
+
+CLEANFILES = *~ */*~
+
+EXTRA_DIST = agents/secret@here modules/Makefile modules/pam_secret.c \
+	regress/Makefile regress/run_test.sh regress/test.libpamc.c \
+	regress/test.secret@here
diff --git a/libpamc/test/Makefile.in b/libpamc/test/Makefile.in
new file mode 100644
index 0000000..e2f360b
--- /dev/null
+++ b/libpamc/test/Makefile.in
@@ -0,0 +1,526 @@
+# Makefile.in generated by automake 1.16.3 from Makefile.am.
+# @configure_input@
+
+# Copyright (C) 1994-2020 Free Software Foundation, Inc.
+
+# This Makefile.in is free software; the Free Software Foundation
+# gives unlimited permission to copy and/or distribute it,
+# with or without modifications, as long as this notice is preserved.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY, to the extent permitted by law; without
+# even the implied warranty of MERCHANTABILITY or FITNESS FOR A
+# PARTICULAR PURPOSE.
+
+@SET_MAKE@
+
+#
+# Copyright (c) 2005 Thorsten Kukuk <kukuk@suse.de>
+#
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+LN_S = @LN_S@
+LTLIBICONV = @LTLIBICONV@
+LTLIBINTL = @LTLIBINTL@
+LTLIBOBJS = @LTLIBOBJS@
+LT_SYS_LIBRARY_PATH = @LT_SYS_LIBRARY_PATH@
+MAKEINFO = @MAKEINFO@
+MANIFEST_TOOL = @MANIFEST_TOOL@
+MKDIR_P = @MKDIR_P@
+MSGFMT = @MSGFMT@
+MSGFMT_015 = @MSGFMT_015@
+MSGMERGE = @MSGMERGE@
+NIS_CFLAGS = @NIS_CFLAGS@
+NIS_LIBS = @NIS_LIBS@
+NM = @NM@
+NMEDIT = @NMEDIT@
+NSL_CFLAGS = @NSL_CFLAGS@
+NSL_LIBS = @NSL_LIBS@
+OBJDUMP = @OBJDUMP@
+OBJEXT = @OBJEXT@
+OTOOL = @OTOOL@
+OTOOL64 = @OTOOL64@
+PACKAGE = @PACKAGE@
+PACKAGE_BUGREPORT = @PACKAGE_BUGREPORT@
+PACKAGE_NAME = @PACKAGE_NAME@
+PACKAGE_STRING = @PACKAGE_STRING@
+PACKAGE_TARNAME = @PACKAGE_TARNAME@
+PACKAGE_URL = @PACKAGE_URL@
+PACKAGE_VERSION = @PACKAGE_VERSION@
+PATH_SEPARATOR = @PATH_SEPARATOR@
+PKG_CONFIG = @PKG_CONFIG@
+PKG_CONFIG_LIBDIR = @PKG_CONFIG_LIBDIR@
+PKG_CONFIG_PATH = @PKG_CONFIG_PATH@
+POSUB = @POSUB@
+RANLIB = @RANLIB@
+SCONFIGDIR = @SCONFIGDIR@
+SECUREDIR = @SECUREDIR@
+SED = @SED@
+SET_MAKE = @SET_MAKE@
+SHELL = @SHELL@
+STRINGPARAM_HMAC = @STRINGPARAM_HMAC@
+STRINGPARAM_VENDORDIR = @STRINGPARAM_VENDORDIR@
+STRIP = @STRIP@
+TIRPC_CFLAGS = @TIRPC_CFLAGS@
+TIRPC_LIBS = @TIRPC_LIBS@
+USE_NLS = @USE_NLS@
+VERSION = @VERSION@
+WARN_CFLAGS = @WARN_CFLAGS@
+XGETTEXT = @XGETTEXT@
+XGETTEXT_015 = @XGETTEXT_015@
+XGETTEXT_EXTRA_OPTIONS = @XGETTEXT_EXTRA_OPTIONS@
+XMLCATALOG = @XMLCATALOG@
+XMLLINT = @XMLLINT@
+XML_CATALOG_FILE = @XML_CATALOG_FILE@
+XSLTPROC = @XSLTPROC@
+YACC = @YACC@
+YFLAGS = @YFLAGS@
+abs_builddir = @abs_builddir@
+abs_srcdir = @abs_srcdir@
+abs_top_builddir = @abs_top_builddir@
+abs_top_srcdir = @abs_top_srcdir@
+ac_ct_AR = @ac_ct_AR@
+ac_ct_CC = @ac_ct_CC@
+ac_ct_DUMPBIN = @ac_ct_DUMPBIN@
+am__include = @am__include@
+am__leading_dot = @am__leading_dot@
+am__quote = @am__quote@
+am__tar = @am__tar@
+am__untar = @am__untar@
+bindir = @bindir@
+build = @build@
+build_alias = @build_alias@
+build_cpu = @build_cpu@
+build_os = @build_os@
+build_vendor = @build_vendor@
+builddir = @builddir@
+datadir = @datadir@
+datarootdir = @datarootdir@
+docdir = @docdir@
+dvidir = @dvidir@
+exec_prefix = @exec_prefix@
+host = @host@
+host_alias = @host_alias@
+host_cpu = @host_cpu@
+host_os = @host_os@
+host_vendor = @host_vendor@
+htmldir = @htmldir@
+includedir = @includedir@
+infodir = @infodir@
+install_sh = @install_sh@
+libdir = @libdir@
+libexecdir = @libexecdir@
+localedir = @localedir@
+localstatedir = @localstatedir@
+mandir = @mandir@
+mkdir_p = @mkdir_p@
+oldincludedir = @oldincludedir@
+pam_xauth_path = @pam_xauth_path@
+pdfdir = @pdfdir@
+prefix = @prefix@
+program_transform_name = @program_transform_name@
+psdir = @psdir@
+sbindir = @sbindir@
+sharedstatedir = @sharedstatedir@
+srcdir = @srcdir@
+sysconfdir = @sysconfdir@
+systemdunitdir = @systemdunitdir@
+target_alias = @target_alias@
+top_build_prefix = @top_build_prefix@
+top_builddir = @top_builddir@
+top_srcdir = @top_srcdir@
+AUTOMAKE_OPTIONS = 1.6 gnits
+CLEANFILES = *~ */*~
+EXTRA_DIST = agents/secret@here modules/Makefile modules/pam_secret.c \
+	regress/Makefile regress/run_test.sh regress/test.libpamc.c \
+	regress/test.secret@here
+
+all: all-am
+
+.SUFFIXES:
+$(srcdir)/Makefile.in:  $(srcdir)/Makefile.am  $(am__configure_deps)
+	@for dep in $?; do \
+	  case '$(am__configure_deps)' in \
+	    *$$dep*) \
+	      ( cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh ) \
+	        && { if test -f $@; then exit 0; else break; fi; }; \
+	      exit 1;; \
+	  esac; \
+	done; \
+	echo ' cd $(top_srcdir) && $(AUTOMAKE) --gnits libpamc/test/Makefile'; \
+	$(am__cd) $(top_srcdir) && \
+	  $(AUTOMAKE) --gnits libpamc/test/Makefile
+Makefile: $(srcdir)/Makefile.in $(top_builddir)/config.status
+	@case '$?' in \
+	  *config.status*) \
+	    cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh;; \
+	  *) \
+	    echo ' cd $(top_builddir) && $(SHELL) ./config.status $(subdir)/$@ $(am__maybe_remake_depfiles)'; \
+	    cd $(top_builddir) && $(SHELL) ./config.status $(subdir)/$@ $(am__maybe_remake_depfiles);; \
+	esac;
+
+$(top_builddir)/config.status: $(top_srcdir)/configure $(CONFIG_STATUS_DEPENDENCIES)
+	cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh
+
+$(top_srcdir)/configure:  $(am__configure_deps)
+	cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh
+$(ACLOCAL_M4):  $(am__aclocal_m4_deps)
+	cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh
+$(am__aclocal_m4_deps):
+
+mostlyclean-libtool:
+	-rm -f *.lo
+
+clean-libtool:
+	-rm -rf .libs _libs
+tags TAGS:
+
+ctags CTAGS:
+
+cscope cscopelist:
+
+
+distdir: $(BUILT_SOURCES)
+	$(MAKE) $(AM_MAKEFLAGS) distdir-am
+
+distdir-am: $(DISTFILES)
+	@srcdirstrip=`echo "$(srcdir)" | sed 's/[].[^$$\\*]/\\\\&/g'`; \
+	topsrcdirstrip=`echo "$(top_srcdir)" | sed 's/[].[^$$\\*]/\\\\&/g'`; \
+	list='$(DISTFILES)'; \
+	  dist_files=`for file in $$list; do echo $$file; done | \
+	  sed -e "s|^$$srcdirstrip/||;t" \
+	      -e "s|^$$topsrcdirstrip/|$(top_builddir)/|;t"`; \
+	case $$dist_files in \
+	  */*) $(MKDIR_P) `echo "$$dist_files" | \
+			   sed '/\//!d;s|^|$(distdir)/|;s,/[^/]*$$,,' | \
+			   sort -u` ;; \
+	esac; \
+	for file in $$dist_files; do \
+	  if test -f $$file || test -d $$file; then d=.; else d=$(srcdir); fi; \
+	  if test -d $$d/$$file; then \
+	    dir=`echo "/$$file" | sed -e 's,/[^/]*$$,,'`; \
+	    if test -d "$(distdir)/$$file"; then \
+	      find "$(distdir)/$$file" -type d ! -perm -700 -exec chmod u+rwx {} \;; \
+	    fi; \
+	    if test -d $(srcdir)/$$file && test $$d != $(srcdir); then \
+	      cp -fpR $(srcdir)/$$file "$(distdir)$$dir" || exit 1; \
+	      find "$(distdir)/$$file" -type d ! -perm -700 -exec chmod u+rwx {} \;; \
+	    fi; \
+	    cp -fpR $$d/$$file "$(distdir)$$dir" || exit 1; \
+	  else \
+	    test -f "$(distdir)/$$file" \
+	    || cp -p $$d/$$file "$(distdir)/$$file" \
+	    || exit 1; \
+	  fi; \
+	done
+check-am: all-am
+check: check-am
+all-am: Makefile
+installdirs:
+install: install-am
+install-exec: install-exec-am
+install-data: install-data-am
+uninstall: uninstall-am
+
+install-am: all-am
+	@$(MAKE) $(AM_MAKEFLAGS) install-exec-am install-data-am
+
+installcheck: installcheck-am
+install-strip:
+	if test -z '$(STRIP)'; then \
+	  $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
+	    install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
+	      install; \
+	else \
+	  $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
+	    install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
+	    "INSTALL_PROGRAM_ENV=STRIPPROG='$(STRIP)'" install; \
+	fi
+mostlyclean-generic:
+
+clean-generic:
+	-test -z "$(CLEANFILES)" || rm -f $(CLEANFILES)
+
+distclean-generic:
+	-test -z "$(CONFIG_CLEAN_FILES)" || rm -f $(CONFIG_CLEAN_FILES)
+	-test . = "$(srcdir)" || test -z "$(CONFIG_CLEAN_VPATH_FILES)" || rm -f $(CONFIG_CLEAN_VPATH_FILES)
+
+maintainer-clean-generic:
+	@echo "This command is intended for maintainers to use"
+	@echo "it deletes files that may require special tools to rebuild."
+clean: clean-am
+
+clean-am: clean-generic clean-libtool mostlyclean-am
+
+distclean: distclean-am
+	-rm -f Makefile
+distclean-am: clean-am distclean-generic
+
+dvi: dvi-am
+
+dvi-am:
+
+html: html-am
+
+html-am:
+
+info: info-am
+
+info-am:
+
+install-data-am:
+
+install-dvi: install-dvi-am
+
+install-dvi-am:
+
+install-exec-am:
+
+install-html: install-html-am
+
+install-html-am:
+
+install-info: install-info-am
+
+install-info-am:
+
+install-man:
+
+install-pdf: install-pdf-am
+
+install-pdf-am:
+
+install-ps: install-ps-am
+
+install-ps-am:
+
+installcheck-am:
+
+maintainer-clean: maintainer-clean-am
+	-rm -f Makefile
+maintainer-clean-am: distclean-am maintainer-clean-generic
+
+mostlyclean: mostlyclean-am
+
+mostlyclean-am: mostlyclean-generic mostlyclean-libtool
+
+pdf: pdf-am
+
+pdf-am:
+
+ps: ps-am
+
+ps-am:
+
+uninstall-am:
+
+.MAKE: install-am install-strip
+
+.PHONY: all all-am check check-am clean clean-generic clean-libtool \
+	cscopelist-am ctags-am distclean distclean-generic \
+	distclean-libtool distdir dvi dvi-am html html-am info info-am \
+	install install-am install-data install-data-am install-dvi \
+	install-dvi-am install-exec install-exec-am install-html \
+	install-html-am install-info install-info-am install-man \
+	install-pdf install-pdf-am install-ps install-ps-am \
+	install-strip installcheck installcheck-am installdirs \
+	maintainer-clean maintainer-clean-generic mostlyclean \
+	mostlyclean-generic mostlyclean-libtool pdf pdf-am ps ps-am \
+	tags-am uninstall uninstall-am
+
+.PRECIOUS: Makefile
+
+
+# Tell versions [3.59,3.63) of GNU make to not export all variables.
+# Otherwise a system limit (for SysV at least) may be exceeded.
+.NOEXPORT:
diff --git a/libpamc/test/agents/secret@here b/libpamc/test/agents/secret@here
new file mode 100755
index 0000000..8d82c01
--- /dev/null
+++ b/libpamc/test/agents/secret@here
@@ -0,0 +1,307 @@
+#!/usr/bin/perl
+#
+# This is a simple example PAM authentication agent, it implements a
+# simple shared secret authentication scheme. The PAM module pam_secret.so
+# is its counter part. Both the agent and the remote server are able to
+# authenticate one another, but the server is given the opportunity to
+# ignore a failed authentication.
+#
+
+$^W = 1;
+use strict;
+use IPC::Open2;
+$| = 1;
+
+# display extra information to STDERR
+my $debug = 0;
+if (scalar @ARGV) {
+    $debug = 1;
+}
+
+# Globals
+
+my %state;
+my $default_key;
+
+my $next_key = $$;
+
+# loop over binary prompts
+for (;;) {
+    my ($control, $data) = ReadBinaryPrompt();
+    my ($reply_control, $reply_data);
+
+    if ($control == 0) {
+	if ($debug) {
+	    print STDERR "agent: no packet to read\n";
+	}
+	last;
+    } elsif ($control == 0x02) {
+	($reply_control, $reply_data) = HandleAgentSelection($data);
+    } elsif ($control == 0x01) {
+	($reply_control, $reply_data) = HandleContinuation($data);
+    } else {
+	if ($debug) {
+	    print STDERR
+		"agent: unrecognized packet $control {$data} to read\n";
+	}
+	($reply_control, $reply_data) = (0x04, "");
+    }
+
+    WriteBinaryPrompt($reply_control, $reply_data);
+}
+
+# Only willing to exit well if we've completed our authentication exchange
+
+if (scalar keys %state) {
+    if ($debug) {
+	print STDERR "The following sessions are still active:\n  ";
+	print STDERR join ', ', keys %state;
+	print STDERR "\n";
+    }
+    exit 1;
+} else {
+    exit 0;
+}
+
+sub HandleAgentSelection ($) {
+    my ($data) = @_;
+
+    unless ( $data =~ /^([a-zA-Z0-9_]+\@?[a-zA-Z0-9_.]*)\/(.*)$/ ) {
+	return (0x04, "");
+    }
+
+    my ($agent_name, $payload) = ($1, $2);
+    if ($debug) {
+	print STDERR "agent: ". "agent=$agent_name, payload=$payload\n";
+    }
+
+    # this agent has a defined name
+    if ($agent_name ne "secret\@here") {
+	if ($debug) {
+	    print STDERR "bad agent name: [$agent_name]\n";
+	}
+	return (0x04, "");
+    }
+
+    # the selection request is acompanied with a hexadecimal cookie
+    my @tokens = split '\|', $payload;
+
+    unless ((scalar @tokens) == 2) {
+	if ($debug) {
+	    print STDERR "bad payload\n";
+	}
+	return (0x04, "");
+    }
+
+    unless ($tokens[1] =~ /^[a-z0-9]+$/) {
+	if ($debug) {
+	    print STDERR "bad server cookie\n";
+	}
+	return (0x04, "");
+    }
+
+    my $shared_secret = IdentifyLocalSecret($tokens[0]);
+
+    unless (defined $shared_secret) {
+	# make a secret up
+	if ($debug) {
+	    print STDERR "agent: cannot authenticate user\n";
+	}
+	$shared_secret = GetRandom();
+    }
+
+    my $local_cookie = GetRandom();
+    $default_key = $next_key++;
+
+    $state{$default_key} = $local_cookie ."|". $tokens[1] ."|". $shared_secret;
+
+    if ($debug) {
+	print STDERR "agent: \$state{$default_key} = $state{$default_key}\n";
+    }
+
+    return (0x01, $default_key ."|". $local_cookie);
+}
+
+sub HandleContinuation ($) {
+    my ($data) = @_;
+
+    my ($key, $server_digest) = split '\|', $data;
+
+    unless (defined $state{$key}) {
+	# retries and out of sequence prompts are not permitted
+	return (0x04, "");
+    }
+
+    my $expected_digest = CreateDigest($state{$key});
+    my ($local_cookie, $remote_cookie, $shared_secret)
+	= split '\|', $state{$key};
+    delete $state{$key};
+
+    unless ($expected_digest eq $server_digest) {
+	if ($debug) {
+	    print STDERR "agent: don't trust server - faking reply\n";
+	    print STDERR "agent: got      ($server_digest)\n";
+	    print STDERR "agent: expected ($expected_digest)\n";
+	}
+
+	## FIXME: Agent should exchange a prompt with the client warning
+	## that the server is faking us out.
+
+	return (0x03, CreateDigest($expected_digest . $data . GetRandom()));
+    }
+
+    if ($debug) {
+	print STDERR "agent: server appears to know the secret\n";
+    }
+
+    my $session_authenticated_ticket =
+	CreateDigest($remote_cookie."|".$shared_secret."|".$local_cookie);
+
+    # FIXME: Agent should set a derived session key environment
+    # variable (available for the client (and its children) to sign
+    # future data exchanges.
+
+    if ($debug) {
+	print STDERR "agent: should putenv("
+	    ."\"AUTH_SESSION_TICKET=$session_authenticated_ticket\")\n";
+    }
+
+    # return agent's authenticating digest
+    return (0x03, CreateDigest($shared_secret."|".$remote_cookie
+			       ."|".$local_cookie));
+}
+
+sub ReadBinaryPrompt {
+    my $buffer = "     ";
+    my $count = read(STDIN, $buffer, 5);
+    if ($count == 0) {
+	# no more packets to read
+	return (0, "");
+    }
+
+    if ($count != 5) {
+	# broken packet header
+	return (-1, "");
+    }
+
+    my ($length, $control) = unpack("N C", $buffer);
+    if ($length < 5) {
+	# broken packet length
+	return (-1, "");
+    }
+
+    my $data = "";
+    $length -= 5;
+    while ($count = read(STDIN, $buffer, $length)) {
+	$data .= $buffer;
+	if ($count != $length) {
+	    $length -= $count;
+	    next;
+	}
+
+	if ($debug) {
+	    print STDERR "agent: ". "data is [$data]\n";
+	}
+
+	return ($control, $data);
+    }
+
+    # broken packet data
+    return (-1, "");
+}
+
+sub WriteBinaryPrompt ($$) {
+    my ($control, $data) = @_;
+
+    my $length = 5 + length($data);
+    if ($debug) {
+	printf STDERR "agent: ". "{%d|0x%.2x|%s}\n", $length, $control, $data;
+    }
+    my $bp = pack("N C a*", $length, $control, $data);
+    print STDOUT $bp;
+    if ($debug) {
+	printf STDERR "agent: ". "agent has replied\n";
+    }
+}
+
+##
+## Here is where we parse the simple secret file
+## The format of this file is a list of lines of the following form:
+##
+## user@client0.host.name  secret_string1
+## user@client1.host.name  secret_string2
+## user@client2.host.name  secret_string3
+##
+
+sub IdentifyLocalSecret ($) {
+    my ($identifier) = @_;
+    my $secret;
+
+    if (open SECRETS, "< ". (getpwuid($<))[7] ."/.secret\@here") {
+	my $line;
+	while (defined ($line = <SECRETS>)) {
+	    my ($id, $sec) = split /[\s]+/, $line;
+	    if ((defined $id) && ($id eq $identifier)) {
+		$secret = $sec;
+		last;
+	    }
+	}
+	close SECRETS;
+    }
+
+    return $secret;
+}
+
+## Here is where we generate a message digest
+
+sub CreateDigest ($) {
+    my ($data) = @_;
+
+    my $pid = open2(\*MD5out, \*MD5in, "/usr/bin/md5sum -")
+	or die "you'll need /usr/bin/md5sum installed";
+
+    my $oldfd = select MD5in; $|=1; select $oldfd;
+    if ($debug) {
+	print STDERR "agent: ". "telling md5: <$data>\n";
+    }
+    print MD5in "$data";
+    close MD5in;
+    my $reply = <MD5out>;
+    ($reply) = split /\s/, $reply;
+    if ($debug) {
+	print STDERR "agent: ". "md5 said: <$reply>\n";
+    }
+    close MD5out;
+
+    return $reply;
+}
+
+## get a random number
+
+sub GetRandom {
+
+    if ( -r "/dev/urandom" ) {
+	open RANDOM, "< /dev/urandom" or die "crazy";
+
+	my $i;
+	my $reply = "";
+
+	for ($i=0; $i<4; ++$i) {
+	    my $buffer = "    ";
+	    while (read(RANDOM, $buffer, 4) != 4) {
+		;
+	    }
+	    $reply .= sprintf "%.8x", unpack("N", $buffer);
+	    if ($debug) {
+		print STDERR "growing reply: [$reply]\n";
+	    }
+	}
+	close RANDOM;
+
+	return $reply;
+    } else {
+	print STDERR "agent: ". "[got linux?]\n";
+	return "%.8x%.8x%.8x%.8x", time, time, time, time;
+    }
+
+}
diff --git a/libpamc/test/modules/Makefile b/libpamc/test/modules/Makefile
new file mode 100644
index 0000000..4806546
--- /dev/null
+++ b/libpamc/test/modules/Makefile
@@ -0,0 +1,9 @@
+CFLAGS = -g -fPIC -I"../../include"
+
+pam_secret.so: pam_secret.o
+	ld -x --shared -o pam_secret.so pam_secret.o -lc
+
+.o.c:
+
+clean:
+	rm -f *.so *.o
diff --git a/libpamc/test/modules/pam_secret.c b/libpamc/test/modules/pam_secret.c
new file mode 100644
index 0000000..f1c74c6
--- /dev/null
+++ b/libpamc/test/modules/pam_secret.c
@@ -0,0 +1,669 @@
+/*
+ * $Id$
+ *
+ * Copyright (c) 1999 Andrew G. Morgan <morgan@linux.kernel.org>
+ */
+
+/*
+ * WARNING: AS WRITTEN THIS CODE IS NOT SECURE. THE MD5 IMPLEMENTATION
+ *          NEEDS TO BE INTEGRATED MORE NATIVELY.
+ */
+
+#include <fcntl.h>
+#include <pwd.h>
+#include <stdio.h>
+#include <string.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+
+#include <security/pam_modules.h>
+#include <security/pam_client.h>
+#include <security/_pam_macros.h>
+
+/*
+ * This is a sample module that demonstrates the use of binary prompts
+ * and how they can be used to implement sophisticated authentication
+ * schemes.
+ */
+
+struct ps_state_s {
+    int retval;        /* last retval returned by the authentication fn */
+    int state;         /* what state the module was in when it
+			  returned incomplete */
+
+    char *username;    /* the name of the local user */
+
+    char server_cookie[33]; /* storage for 32 bytes of server cookie */
+    char client_cookie[33]; /* storage for 32 bytes of client cookie */
+
+    char *secret_data; /* pointer to <NUL> terminated secret_data */
+    int invalid_secret;  /* indication of whether the secret is valid */
+
+    pamc_bp_t current_prompt;    /* place to store the current prompt */
+    pamc_bp_t current_reply;     /* place to receive the reply prompt */
+};
+
+#define PS_STATE_ID   "PAM_SECRET__STATE"
+#define PS_AGENT_ID   "secret@here"
+#define PS_STATE_DEAD          0
+#define PS_STATE_INIT          1
+#define PS_STATE_PROMPT1       2
+#define PS_STATE_PROMPT2       3
+
+#define MAX_LEN_HOSTNAME       512
+#define MAX_FILE_LINE_LEN      1024
+
+/*
+ * Routine for generating 16*8 bits of random data represented in ASCII hex
+ */
+
+static int generate_cookie(unsigned char *buffer_33)
+{
+    static const char hexarray[] = "0123456789abcdef";
+    int i, fd;
+
+    /* fill buffer_33 with 32 hex characters (lower case) + '\0' */
+    fd = open("/dev/urandom", O_RDONLY);
+    if (fd < 0) {
+	D(("failed to open /dev/urandom"));
+	return 0;
+    }
+    read(fd, buffer_33 + 16, 16);
+    close(fd);
+
+    /* expand top 16 bytes into 32 nibbles */
+    for (i=0; i<16; ++i) {
+	buffer_33[2*i  ] = hexarray[(buffer_33[16+i] & 0xf0)>>4];
+	buffer_33[2*i+1] = hexarray[(buffer_33[16+i] & 0x0f)];
+    }
+
+    buffer_33[32] = '\0';
+
+    return 1;
+}
+
+/*
+ * XXX - This is a hack, and is fundamentally insecure. Its subject to
+ * all sorts of attacks not to mention the fact that all our secrets
+ * will be displayed on the command line for someone doing 'ps' to
+ * see. This is just for programming convenience in this instance, it
+ * needs to be replaced with the md5 code. Although I am loath to
+ * add yet another instance of md5 code to the Linux-PAM source code.
+ * [Need to think of a cleaner way to do this for the distribution as
+ * a whole...]
+ */
+
+#define COMMAND_FORMAT "/bin/echo -n '%s|%s|%s'|/usr/bin/md5sum -"
+
+int create_digest(const char *d1, const char *d2, const char *d3,
+		  char *buffer_33)
+{
+    int length;
+    char *buffer;
+    FILE *pipe;
+
+    length = strlen(d1)+strlen(d2)+strlen(d3)+sizeof(COMMAND_FORMAT);
+    buffer = malloc(length);
+    if (buffer == NULL) {
+	D(("out of memory"));
+	return 0;
+    }
+
+    sprintf(buffer, COMMAND_FORMAT, d1,d2,d3);
+
+    D(("executing pipe [%s]", buffer));
+    pipe = popen(buffer, "r");
+    memset(buffer, 0, length);
+    free(buffer);
+
+    if (pipe == NULL) {
+	D(("failed to launch pipe"));
+	return 0;
+    }
+
+    if (fgets(buffer_33, 33, pipe) == NULL) {
+	D(("failed to read digest"));
+	return 0;
+    }
+
+    if (strlen(buffer_33) != 32) {
+	D(("digest was not 32 chars"));
+	return 0;
+    }
+
+    fclose(pipe);
+
+    D(("done [%s]", buffer_33));
+
+    return 1;
+}
+
+/*
+ * method to attempt to instruct the application's conversation function
+ */
+
+static int converse(pam_handle_t *pamh, struct ps_state_s *new)
+{
+    int retval;
+    struct pam_conv *conv;
+
+    D(("called"));
+
+    retval = pam_get_item(pamh, PAM_CONV, (const void **) &conv);
+    if (retval == PAM_SUCCESS) {
+	struct pam_message msg;
+	struct pam_response *single_reply;
+	const struct pam_message *msg_ptr;
+
+	memset(&msg, 0, sizeof(msg));
+	msg.msg_style = PAM_BINARY_PROMPT;
+	msg.msg = (const char *) new->current_prompt;
+	msg_ptr = &msg;
+
+	single_reply = NULL;
+	retval = conv->conv(1, &msg_ptr, &single_reply, conv->appdata_ptr);
+	if (retval == PAM_SUCCESS) {
+	    if ((single_reply == NULL) || (single_reply->resp == NULL)) {
+		retval == PAM_CONV_ERR;
+	    } else {
+		new->current_reply = (pamc_bp_t) single_reply->resp;
+		single_reply->resp = NULL;
+	    }
+	}
+
+	if (single_reply) {
+	    free(single_reply);
+	}
+    }
+
+#ifdef PAM_DEBUG
+    if (retval == PAM_SUCCESS) {
+	D(("reply has length=%d and control=%u",
+	   PAM_BP_LENGTH(new->current_reply),
+	   PAM_BP_CONTROL(new->current_reply)));
+    }
+    D(("returning %s", pam_strerror(pamh, retval)));
+#endif
+
+    return retval;
+}
+
+/*
+ * identify the secret in question
+ */
+
+#define SECRET_FILE_FORMAT "%s/.secret@here"
+
+char *identify_secret(char *identity, const char *user)
+{
+    struct passwd *pwd;
+    char *temp;
+    FILE *secrets;
+    int length_id;
+
+    pwd = getpwnam(user);
+    if ((pwd == NULL) || (pwd->pw_dir == NULL)) {
+	D(("user [%s] is not known", user));
+	return NULL;
+    }
+
+    length_id = strlen(pwd->pw_dir) + sizeof(SECRET_FILE_FORMAT);
+    temp = malloc(length_id);
+    if (temp == NULL) {
+	D(("out of memory"));
+	pwd = NULL;
+	return NULL;
+    }
+
+    sprintf(temp, SECRET_FILE_FORMAT, pwd->pw_dir);
+    pwd = NULL;
+
+    D(("opening key file [%s]", temp));
+    secrets = fopen(temp, "r");
+    memset(temp, 0, length_id);
+
+    if (secrets == NULL) {
+	D(("failed to open key file"));
+	return NULL;
+    }
+
+    length_id = strlen(identity);
+    temp = malloc(MAX_FILE_LINE_LEN);
+
+    for (;;) {
+	char *secret = NULL;
+
+	if (fgets(temp, MAX_FILE_LINE_LEN, secrets) == NULL) {
+	    fclose(secrets);
+	    return NULL;
+	}
+
+	D(("cf[%s][%s]", identity, temp));
+	if (memcmp(temp, identity, length_id)) {
+	    continue;
+	}
+
+	D(("found entry"));
+	fclose(secrets);
+
+	for (secret=temp+length_id; *secret; ++secret) {
+	    if (!(*secret == ' ' || *secret == '\n' || *secret == '\t')) {
+		break;
+	    }
+	}
+
+	memmove(temp, secret, MAX_FILE_LINE_LEN-(secret-(temp+length_id)));
+	secret = temp;
+
+	for (; *secret; ++secret) {
+	    if (*secret == ' ' || *secret == '\n' || *secret == '\t') {
+		break;
+	    }
+	}
+
+	if (*secret) {
+	    *secret = '\0';
+	}
+
+	D(("secret found [%s]", temp));
+
+	return temp;
+    }
+
+    /* NOT REACHED */
+}
+
+/*
+ * function to perform the two message authentication process
+ * (with support for event driven conversation functions)
+ */
+
+static int auth_sequence(pam_handle_t *pamh,
+			 const struct ps_state_s *old, struct ps_state_s *new)
+{
+    const char *rhostname;
+    const char *rusername;
+    int retval;
+
+    retval = pam_get_item(pamh, PAM_RUSER, (const void **) &rusername);
+    if ((retval != PAM_SUCCESS) || (rusername == NULL)) {
+	D(("failed to obtain an rusername"));
+	new->state = PS_STATE_DEAD;
+	return PAM_AUTH_ERR;
+    }
+
+    retval = pam_get_item(pamh, PAM_RHOST, (const void **) &rhostname);
+    if ((retval != PAM_SUCCESS) || (rhostname == NULL)) {
+	D(("failed to identify local hostname: ", pam_strerror(pamh, retval)));
+	new->state = PS_STATE_DEAD;
+	return PAM_AUTH_ERR;
+    }
+
+    D(("switch on new->state=%d [%s@%s]", new->state, rusername, rhostname));
+    switch (new->state) {
+
+    case PS_STATE_INIT:
+    {
+	const char *user = NULL;
+
+	retval = pam_get_user(pamh, &user, NULL);
+
+	if ((retval == PAM_SUCCESS) && (user == NULL)) {
+	    D(("success but no username?"));
+	    new->state = PS_STATE_DEAD;
+	    retval = PAM_USER_UNKNOWN;
+	}
+
+	if (retval != PAM_SUCCESS) {
+	    if (retval == PAM_CONV_AGAIN) {
+		retval = PAM_INCOMPLETE;
+	    } else {
+		new->state = PS_STATE_DEAD;
+	    }
+	    D(("state init failed: %s", pam_strerror(pamh, retval)));
+	    return retval;
+	}
+
+	/* nothing else in this 'case' can be retried */
+
+	new->username = strdup(user);
+	if (new->username == NULL) {
+	    D(("out of memory"));
+	    new->state = PS_STATE_DEAD;
+	    return PAM_BUF_ERR;
+	}
+
+	if (! generate_cookie(new->server_cookie)) {
+	    D(("problem generating server cookie"));
+	    new->state = PS_STATE_DEAD;
+	    return PAM_ABORT;
+	}
+
+	new->current_prompt = NULL;
+	PAM_BP_RENEW(&new->current_prompt, PAM_BPC_SELECT,
+		     sizeof(PS_AGENT_ID) + strlen(rusername) + 1
+		     + strlen(rhostname) + 1 + 32);
+	sprintf(PAM_BP_WDATA(new->current_prompt),
+		PS_AGENT_ID "/%s@%s|%.32s", rusername, rhostname,
+		new->server_cookie);
+
+	/* note, the BP is guaranteed by the spec to be <NUL> terminated */
+	D(("initialization packet [%s]", PAM_BP_DATA(new->current_prompt)));
+
+	/* fall through */
+	new->state = PS_STATE_PROMPT1;
+
+	D(("fall through to state_prompt1"));
+    }
+
+    case PS_STATE_PROMPT1:
+    {
+	int i, length;
+
+	/* send {secret@here/jdoe@client.host|<s_cookie>} */
+	retval = converse(pamh, new);
+	if (retval != PAM_SUCCESS) {
+	    if (retval == PAM_CONV_AGAIN) {
+		D(("conversation failed to complete"));
+		return PAM_INCOMPLETE;
+	    } else {
+		new->state = PS_STATE_DEAD;
+		return retval;
+	    }
+	}
+
+	if (retval != PAM_SUCCESS) {
+	    D(("failed to read ruser@rhost"));
+	    new->state = PS_STATE_DEAD;
+	    return PAM_AUTH_ERR;
+	}
+
+	/* expect to receive the following {<seqid>|<a_cookie>} */
+	if (new->current_reply == NULL) {
+	    D(("converstation returned [%s] but gave no reply",
+	       pam_strerror(pamh, retval)));
+	    new->state = PS_STATE_DEAD;
+	    return PAM_CONV_ERR;
+	}
+
+	/* find | */
+	length = PAM_BP_LENGTH(new->current_reply);
+	for (i=0; i<length; ++i) {
+	    if (PAM_BP_RDATA(new->current_reply)[i] == '|') {
+		break;
+	    }
+	}
+	if (i >= length) {
+	    D(("malformed response (no |) of length %d", length));
+	    new->state = PS_STATE_DEAD;
+	    return PAM_CONV_ERR;
+	}
+	if ((length - ++i) != 32) {
+	    D(("cookie is incorrect length (%d,%d) %d != 32",
+	       length, i, length-i));
+	    new->state = PS_STATE_DEAD;
+	    return PAM_CONV_ERR;
+	}
+
+	/* copy client cookie */
+	memcpy(new->client_cookie, PAM_BP_RDATA(new->current_reply)+i, 32);
+
+	/* generate a prompt that is length(seqid) + length(|) + 32 long */
+	PAM_BP_RENEW(&new->current_prompt, PAM_BPC_OK, i+32);
+	/* copy the head of the response prompt */
+	memcpy(PAM_BP_WDATA(new->current_prompt),
+	       PAM_BP_RDATA(new->current_reply), i);
+	PAM_BP_RENEW(&new->current_reply, 0, 0);
+
+	/* look up the secret */
+	new->invalid_secret = 0;
+
+	if (new->secret_data == NULL) {
+	    char *ruser_rhost;
+
+	    ruser_rhost = malloc(strlen(rusername)+2+strlen(rhostname));
+	    if (ruser_rhost == NULL) {
+		D(("out of memory"));
+		new->state = PS_STATE_DEAD;
+		return PAM_BUF_ERR;
+	    }
+	    sprintf(ruser_rhost, "%s@%s", rusername, rhostname);
+	    new->secret_data = identify_secret(ruser_rhost, new->username);
+
+	    memset(ruser_rhost, 0, strlen(ruser_rhost));
+	    free(ruser_rhost);
+	}
+
+	if (new->secret_data == NULL) {
+	    D(("secret not found for user"));
+	    new->invalid_secret = 1;
+
+	    /* need to make up a secret */
+	    new->secret_data = malloc(32 + 1);
+	    if (new->secret_data == NULL) {
+		D(("out of memory"));
+		new->state = PS_STATE_DEAD;
+		return PAM_BUF_ERR;
+	    }
+	    if (! generate_cookie(new->secret_data)) {
+		D(("what's up - no fake cookie generated?"));
+		new->state = PS_STATE_DEAD;
+		return PAM_ABORT;
+	    }
+	}
+
+	/* construct md5[<client_cookie>|<server_cookie>|<secret_data>] */
+	if (! create_digest(new->client_cookie, new->server_cookie,
+			    new->secret_data,
+			    PAM_BP_WDATA(new->current_prompt)+i)) {
+	    D(("md5 digesting failed"));
+	    new->state = PS_STATE_DEAD;
+	    return PAM_ABORT;
+	}
+
+	/* prompt2 is now constructed - fall through to send it */
+    }
+
+    case PS_STATE_PROMPT2:
+    {
+	/* send {<seqid>|md5[<client_cookie>|<server_cookie>|<secret_data>]} */
+	retval = converse(pamh, new);
+	if (retval != PAM_SUCCESS) {
+	    if (retval == PAM_CONV_AGAIN) {
+		D(("conversation failed to complete"));
+		return PAM_INCOMPLETE;
+	    } else {
+		new->state = PS_STATE_DEAD;
+		return retval;
+	    }
+	}
+
+	/* After we complete this section, we should not be able to
+	   recall this authentication function. So, we force all
+	   future calls into the weeds. */
+
+	new->state = PS_STATE_DEAD;
+
+	/* expect reply:{md5[<secret_data>|<server_cookie>|<client_cookie>]} */
+
+	{
+	    int cf;
+	    char expectation[33];
+
+	    if (!create_digest(new->secret_data, new->server_cookie,
+			       new->client_cookie, expectation)) {
+		new->state = PS_STATE_DEAD;
+		return PAM_ABORT;
+	    }
+
+	    cf = strcmp(expectation, PAM_BP_RDATA(new->current_reply));
+	    memset(expectation, 0, sizeof(expectation));
+	    if (cf || new->invalid_secret) {
+		D(("failed to authenticate"));
+		return PAM_AUTH_ERR;
+	    }
+	}
+
+	D(("correctly authenticated :)"));
+	return PAM_SUCCESS;
+    }
+
+    default:
+	new->state = PS_STATE_DEAD;
+
+    case PS_STATE_DEAD:
+
+	D(("state is currently dead/unknown"));
+	return PAM_AUTH_ERR;
+    }
+
+    fprintf(stderr, "pam_secret: this should not be reached\n");
+    return PAM_ABORT;
+}
+
+static void clean_data(pam_handle_t *pamh, void *datum, int error_status)
+{
+    struct ps_state_s *data = datum;
+
+    D(("liberating datum=%p", datum));
+
+    if (data) {
+	D(("renew prompt"));
+	PAM_BP_RENEW(&data->current_prompt, 0, 0);
+	D(("renew reply"));
+	PAM_BP_RENEW(&data->current_reply, 0, 0);
+	D(("overwrite datum"));
+	memset(data, 0, sizeof(struct ps_state_s));
+	D(("liberate datum"));
+	free(data);
+    }
+
+    D(("done."));
+}
+
+/*
+ * front end for the authentication function
+ */
+
+int pam_sm_authenticate(pam_handle_t *pamh, int flags,
+			int argc, const char **argv)
+{
+    int retval;
+    struct ps_state_s *new_data;
+    const struct ps_state_s *old_data;
+
+    D(("called"));
+
+    new_data = calloc(1, sizeof(struct ps_state_s));
+    if (new_data == NULL) {
+	D(("out of memory"));
+	return PAM_BUF_ERR;
+    }
+    new_data->retval = PAM_SUCCESS;
+
+    retval = pam_get_data(pamh, PS_STATE_ID, (const void **) &old_data);
+    if (retval == PAM_SUCCESS) {
+	new_data->state = old_data->state;
+	memcpy(new_data->server_cookie, old_data->server_cookie, 32);
+	memcpy(new_data->client_cookie, old_data->client_cookie, 32);
+	if (old_data->username) {
+	    new_data->username = strdup(old_data->username);
+	}
+	if (old_data->secret_data) {
+	    new_data->secret_data = strdup(old_data->secret_data);
+	}
+	if (old_data->current_prompt) {
+	    int length;
+
+	    length = PAM_BP_LENGTH(old_data->current_prompt);
+	    PAM_BP_RENEW(&new_data->current_prompt,
+			 PAM_BP_CONTROL(old_data->current_prompt), length);
+	    PAM_BP_FILL(new_data->current_prompt, 0, length,
+			PAM_BP_RDATA(old_data->current_prompt));
+	}
+	/* don't need to duplicate current_reply */
+    } else {
+	old_data = NULL;
+	new_data->state = PS_STATE_INIT;
+    }
+
+    D(("call auth_sequence"));
+    new_data->retval = auth_sequence(pamh, old_data, new_data);
+    D(("returned from auth_sequence"));
+
+    retval = pam_set_data(pamh, PS_STATE_ID, new_data, clean_data);
+    if (retval != PAM_SUCCESS) {
+	D(("unable to store new_data"));
+    } else {
+	retval = new_data->retval;
+    }
+
+    old_data = new_data = NULL;
+
+    D(("done (%d)", retval));
+    return retval;
+}
+
+/*
+ * front end for the credential setting function
+ */
+
+#define AUTH_SESSION_TICKET_ENV_FORMAT "AUTH_SESSION_TICKET="
+
+int pam_sm_setcred(pam_handle_t *pamh, int flags,
+		   int argc, const char **argv)
+{
+    int retval;
+    const struct ps_state_s *old_data;
+
+    D(("called"));
+
+    /* XXX - need to pay attention to the various flavors of call */
+
+    /* XXX - need provide an option to turn this feature on/off: if
+       other modules want to supply an AUTH_SESSION_TICKET, we should
+       leave it up to the admin which module dominiates. */
+
+    retval = pam_get_data(pamh, PS_STATE_ID, (const void **) &old_data);
+    if (retval != PAM_SUCCESS) {
+	D(("no data to base decision on"));
+	return PAM_AUTH_ERR;
+    }
+
+    /*
+     * If ok, export a derived shared secret session ticket to the
+     * client's PAM environment - the ticket has the form
+     *
+     * AUTH_SESSION_TICKET =
+     *        md5[<server_cookie>|<secret_data>|<client_cookie>]
+     *
+     * This is a precursor to supporting a spoof resistant trusted
+     * path mechanism. This shared secret ticket can be used to add
+     * a hard-to-guess checksum to further authentication data.
+     */
+
+    retval = old_data->retval;
+    if (retval == PAM_SUCCESS) {
+	char envticket[sizeof(AUTH_SESSION_TICKET_ENV_FORMAT)+32];
+
+	memcpy(envticket, AUTH_SESSION_TICKET_ENV_FORMAT,
+	       sizeof(AUTH_SESSION_TICKET_ENV_FORMAT));
+
+	if (! create_digest(old_data->server_cookie, old_data->secret_data,
+			    old_data->client_cookie,
+			    envticket+sizeof(AUTH_SESSION_TICKET_ENV_FORMAT)-1
+	    )) {
+	    D(("unable to generate a digest for session ticket"));
+	    return PAM_ABORT;
+	}
+
+	D(("putenv[%s]", envticket));
+	retval = pam_putenv(pamh, envticket);
+	memset(envticket, 0, sizeof(envticket));
+    }
+
+    old_data = NULL;
+    D(("done (%d)", retval));
+
+    return retval;
+}
diff --git a/libpamc/test/regress/Makefile b/libpamc/test/regress/Makefile
new file mode 100644
index 0000000..cba474f
--- /dev/null
+++ b/libpamc/test/regress/Makefile
@@ -0,0 +1,7 @@
+CFLAGS = -g -I ../../include
+
+test.libpamc: test.libpamc.o
+	$(CC) -o $@ $(CFLAGS) $< -L ../.. -lpamc
+
+clean:
+	rm -f test.libpamc test.libpamc.o
diff --git a/libpamc/test/regress/run_test.sh b/libpamc/test/regress/run_test.sh
new file mode 100755
index 0000000..6922f03
--- /dev/null
+++ b/libpamc/test/regress/run_test.sh
@@ -0,0 +1,6 @@
+#!/bin/sh
+
+LD_LIBRARY_PATH=../.. ; export LD_LIBRARY_PATH
+PAMC_AGENT_PATH="../agents" ; export PAMC_AGENT_PATH
+
+./test.libpamc
diff --git a/libpamc/test/regress/test.libpamc.c b/libpamc/test/regress/test.libpamc.c
new file mode 100644
index 0000000..4251b4f
--- /dev/null
+++ b/libpamc/test/regress/test.libpamc.c
@@ -0,0 +1,343 @@
+/*
+ * This is a small test program for testing libpamc against the
+ * secret@here agent. It does the same as the test.secret@here perl
+ * script in this directory, but via the libpamc API.
+ */
+
+#include <stdio.h>
+#include <stdint.h>
+#include <string.h>
+#include <security/pam_client.h>
+#include <ctype.h>
+
+struct internal_packet {
+    int length;
+    int at;
+    char *buffer;
+};
+
+
+void append_data(struct internal_packet *packet, int extra, const char *data)
+{
+    if ((extra + packet->at) >= packet->length) {
+	if (packet->length == 0) {
+	    packet->length = 1000;
+	}
+	/* make sure we have at least a char extra space available */
+	while (packet->length <= (extra + packet->at)) {
+	    packet->length <<= 1;
+	}
+	packet->buffer = realloc(packet->buffer, packet->length);
+	if (packet->buffer == NULL) {
+	    fprintf(stderr, "out of memory\n");
+	    exit(1);
+	}
+    }
+
+    if (data != NULL) {
+	memcpy(packet->at + packet->buffer, data, extra);
+    }
+    packet->at += extra;
+
+    /* assisting string manipulation */
+    packet->buffer[packet->at] = '\0';
+}
+
+void append_string(struct internal_packet *packet, const char *string,
+		   int with_nul)
+{
+    append_data(packet, strlen(string) + (with_nul ? 1:0), string);
+}
+
+char *identify_secret(char *identity)
+{
+    struct internal_packet temp_packet;
+    FILE *secrets;
+    int length_id;
+
+    temp_packet.length = temp_packet.at = 0;
+    temp_packet.buffer = NULL;
+
+    append_string(&temp_packet, "/home/", 0);
+    append_string(&temp_packet, getlogin(), 0);
+    append_string(&temp_packet, "/.secret@here", 1);
+
+    secrets = fopen(temp_packet.buffer, "r");
+    if (secrets == NULL) {
+	fprintf(stderr, "server: failed to open\n  [%s]\n",
+		temp_packet.buffer);
+	exit(1);
+    }
+
+    length_id = strlen(identity);
+    for (;;) {
+	char *secret = NULL;
+	temp_packet.at = 0;
+
+	if (fgets(temp_packet.buffer, temp_packet.length, secrets) == NULL) {
+	    fclose(secrets);
+	    return NULL;
+	}
+
+	if (memcmp(temp_packet.buffer, identity, length_id)) {
+	    continue;
+	}
+
+	fclose(secrets);
+	for (secret=temp_packet.buffer; *secret; ++secret) {
+	    if (*secret == ' ' || *secret == '\n' || *secret == '\t') {
+		break;
+	    }
+	}
+	for (; *secret; ++secret) {
+	    if (!(*secret == ' ' || *secret == '\n' || *secret == '\t')) {
+		break;
+	    }
+	}
+
+	for (temp_packet.buffer=secret; *temp_packet.buffer;
+	     ++temp_packet.buffer) {
+	    if (*temp_packet.buffer == ' ' || *temp_packet.buffer == '\n'
+		|| *temp_packet.buffer == '\t') {
+		break;
+	    }
+	}
+	if (*temp_packet.buffer) {
+	    *temp_packet.buffer = '\0';
+	}
+
+	return secret;
+    }
+
+    /* NOT REACHED */
+}
+
+/*
+ * This is a hack, and is fundamentally insecure. All our secrets will be
+ * displayed on the command line for someone doing 'ps' to see. This
+ * is just for programming convenience in this instance, since this
+ * program is simply a regression test. The pam_secret module should
+ * not do this, but make use of md5 routines directly.
+ */
+
+char *create_digest(int length, const char *raw)
+{
+    struct internal_packet temp_packet;
+    FILE *pipe;
+
+    temp_packet.length = temp_packet.at = 0;
+    temp_packet.buffer = NULL;
+
+    append_string(&temp_packet, "echo -n '", 0);
+    append_string(&temp_packet, raw, 0);
+    append_string(&temp_packet, "'|/usr/bin/md5sum -", 1);
+
+    fprintf(stderr, "am attempting to run [%s]\n", temp_packet.buffer);
+
+    pipe = popen(temp_packet.buffer, "r");
+    if (pipe == NULL) {
+	fprintf(stderr, "server: failed to run\n  [%s]\n", temp_packet.buffer);
+	exit(1);
+    }
+
+    temp_packet.at = 0;
+    append_data(&temp_packet, 32, NULL);
+
+    if (fgets(temp_packet.buffer, 33, pipe) == NULL) {
+	fprintf(stderr, "server: failed to read digest\n");
+	exit(1);
+    }
+    if (strlen(temp_packet.buffer) != 32) {
+	fprintf(stderr, "server: digest was not 32 chars?? [%s]\n",
+		temp_packet.buffer);
+	exit(1);
+    }
+
+    fclose(pipe);
+
+    return temp_packet.buffer;
+}
+
+void packet_to_prompt(pamc_bp_t *prompt_p, uint8_t control,
+		      struct internal_packet *packet)
+{
+    PAM_BP_RENEW(prompt_p, control, packet->at);
+    PAM_BP_FILL(*prompt_p, 0, packet->at, packet->buffer);
+    packet->at = 0;
+}
+
+void prompt_to_packet(pamc_bp_t prompt, struct internal_packet *packet)
+{
+    int data_length;
+
+    data_length = PAM_BP_LENGTH(prompt);
+    packet->at = 0;
+    append_data(packet, data_length, NULL);
+
+    PAM_BP_EXTRACT(prompt, 0, data_length, packet->buffer);
+
+    fprintf(stderr, "server received[%d]: {%d|0x%.2x|%s}\n",
+	    data_length,
+	    PAM_BP_SIZE(prompt), PAM_BP_RCONTROL(prompt),
+	    PAM_BP_RDATA(prompt));
+}
+
+int main(int argc, char **argv)
+{
+    pamc_handle_t pch;
+    pamc_bp_t prompt = NULL;
+    struct internal_packet packet_data, *packet;
+    char *temp_string, *secret, *user, *a_cookie, *seqid, *digest;
+    const char *cookie = "123451234512345";
+    int retval;
+
+    packet = &packet_data;
+    packet->length = 0;
+    packet->at = 0;
+    packet->buffer = NULL;
+
+    pch = pamc_start();
+    if (pch == NULL) {
+	fprintf(stderr, "server: unable to get a handle from libpamc\n");
+	exit(1);
+    }
+
+    temp_string = getlogin();
+    if (temp_string == NULL) {
+	fprintf(stderr, "server: who are you?\n");
+	exit(1);
+    }
+#define DOMAIN "@local.host"
+    user = malloc(1+strlen(temp_string)+strlen(DOMAIN));
+    if (user == NULL) {
+	fprintf(stderr, "server: out of memory for user id\n");
+	exit(1);
+    }
+    sprintf(user, "%s%s", temp_string, DOMAIN);
+
+    append_string(packet, "secret@here/", 0);
+    append_string(packet, user, 0);
+    append_string(packet, "|", 0);
+    append_string(packet, cookie, 0);
+    packet_to_prompt(&prompt, PAM_BPC_SELECT, packet);
+
+    /* get the library to accept the first packet (which should load
+       the secret@here agent) */
+
+    retval = pamc_converse(pch, &prompt);
+    fprintf(stderr, "server: after conversation\n");
+    if (PAM_BP_RCONTROL(prompt) != PAM_BPC_OK) {
+	fprintf(stderr, "server: prompt had unexpected control type: %u\n",
+		PAM_BP_RCONTROL(prompt));
+	exit(1);
+    }
+
+    fprintf(stderr, "server: got a prompt back\n");
+
+    prompt_to_packet(prompt, packet);
+
+    temp_string = strtok(packet->buffer, "|");
+    if (temp_string == NULL) {
+	fprintf(stderr, "server: prompt does not contain anything");
+	exit(1);
+    }
+    seqid = strdup(temp_string);
+    if (seqid == NULL) {
+	fprintf(stderr, "server: unable to store sequence id\n");
+    }
+
+    temp_string = strtok(NULL, "|");
+    if (temp_string == NULL) {
+	fprintf(stderr, "server: no cookie from agent\n");
+	exit(1);
+    }
+    a_cookie = strdup(temp_string);
+    if (a_cookie == NULL) {
+	fprintf(stderr, "server: no memory to store agent cookie\n");
+	exit(1);
+    }
+
+    fprintf(stderr, "server: agent responded with {%s|%s}\n", seqid, a_cookie);
+    secret = identify_secret(user);
+    fprintf(stderr, "server: secret=%s\n", secret);
+
+    /* now, we construct the response */
+    packet->at = 0;
+    append_string(packet, a_cookie, 0);
+    append_string(packet, "|", 0);
+    append_string(packet, cookie, 0);
+    append_string(packet, "|", 0);
+    append_string(packet, secret, 0);
+
+    fprintf(stderr, "server: get digest of %s\n", packet->buffer);
+
+    digest = create_digest(packet->at, packet->buffer);
+
+    fprintf(stderr, "server: secret=%s, digest=%s\n", secret, digest);
+
+    packet->at = 0;
+    append_string(packet, seqid, 0);
+    append_string(packet, "|", 0);
+    append_string(packet, digest, 0);
+    packet_to_prompt(&prompt, PAM_BPC_OK, packet);
+
+    retval = pamc_converse(pch, &prompt);
+    fprintf(stderr, "server: after 2nd conversation\n");
+    if (PAM_BP_RCONTROL(prompt) != PAM_BPC_DONE) {
+	fprintf(stderr, "server: 2nd prompt had unexpected control type: %u\n",
+		PAM_BP_RCONTROL(prompt));
+	exit(1);
+    }
+
+    prompt_to_packet(prompt, packet);
+    PAM_BP_RENEW(&prompt, 0, 0);
+
+    temp_string = strtok(packet->buffer, "|");
+    if (temp_string == NULL) {
+	fprintf(stderr, "no digest from agent\n");
+	exit(1);
+    }
+    temp_string = strdup(temp_string);
+
+    packet->at = 0;
+    append_string(packet, secret, 0);
+    append_string(packet, "|", 0);
+    append_string(packet, cookie, 0);
+    append_string(packet, "|", 0);
+    append_string(packet, a_cookie, 0);
+
+    fprintf(stderr, "server: get digest of %s\n", packet->buffer);
+
+    digest = create_digest(packet->at, packet->buffer);
+
+    fprintf(stderr, "server: digest=%s\n", digest);
+
+    if (strcmp(digest, temp_string)) {
+	fprintf(stderr, "server: agent doesn't know the secret\n");
+	fprintf(stderr, "server: agent says:  [%s]\n"
+	                "server: server says: [%s]\n", temp_string, digest);
+	exit(1);
+    } else {
+	fprintf(stderr, "server: agent seems to know the secret\n");
+
+	packet->at = 0;
+	append_string(packet, cookie, 0);
+	append_string(packet, "|", 0);
+	append_string(packet, secret, 0);
+	append_string(packet, "|", 0);
+	append_string(packet, a_cookie, 0);
+
+	digest = create_digest(packet->at, packet->buffer);
+
+	fprintf(stderr, "server: putenv(\"AUTH_SESSION_TICKET=%s\")\n",
+		digest);
+    }
+
+
+    retval = pamc_end(&pch);
+
+    fprintf(stderr, "server: agent(s) were %shappy to terminate\n",
+	    retval == PAM_BPC_TRUE ? "":"un");
+
+    exit(!retval);
+}
diff --git a/libpamc/test/regress/test.secret@here b/libpamc/test/regress/test.secret@here
new file mode 100755
index 0000000..67fe22e
--- /dev/null
+++ b/libpamc/test/regress/test.secret@here
@@ -0,0 +1,151 @@
+#!/usr/bin/perl
+
+##
+## this is a test script for regressing changes to the secret@here PAM
+## agent
+##
+
+$^W = 1;
+use strict;
+use IPC::Open2;
+
+$| = 1;
+
+my $whoami = `/usr/bin/whoami`; chomp $whoami;
+my $cookie = "12345";
+my $user_domain = "$whoami\@local.host";
+
+my $pid = open2(\*Reader, \*Writer, "../agents/secret\@here blah")
+    or die "failed to load secret\@here agent";
+
+unless (-f (getpwuid($<))[7]."/.secret\@here") {
+    print STDERR "server: ". "no " .(getpwuid($<))[7]. "/.secret\@here file\n";
+    die "no config file";
+}
+
+WriteBinaryPrompt(\*Writer, 0x02, "secret\@here/$user_domain|$cookie");
+
+my ($control, $data) = ReadBinaryPrompt(\*Reader);
+
+print STDERR "server: ". "reply: control=$control, data=$data\n";
+if ($control != 1) {
+    die "expected 1 (OK) for the first agent reply; got $control";
+}
+my ($seqid, $a_cookie) = split '\|', $data;
+
+# server needs to convince agent that it knows the secret before
+# agent will give a valid response
+my $secret = IdentifyLocalSecret($user_domain);
+my $digest = CreateDigest($a_cookie."|".$cookie."|".$secret);
+
+print STDERR "server: ". "digest = $digest\n";
+WriteBinaryPrompt(\*Writer, 0x01, "$seqid|$digest");
+
+# The agent will authenticate us and then reply with its
+# authenticating digest. we check that before we're done.
+
+($control, $data) = ReadBinaryPrompt(\*Reader);
+if ($control != 0x03) {
+    die "server: agent did not reply with a 'done' prompt ($control)\n";
+}
+
+unless ($data eq CreateDigest($secret."|".$cookie."|".$a_cookie)) {
+    die "server: agent is not authenticated\n";
+}
+
+print STDERR "server: agent appears to know secret\n";
+
+my $session_authenticated_ticket
+    = CreateDigest($cookie."|".$secret."|".$a_cookie);
+
+print STDERR "server: should putenv("
+	    ."\"AUTH_SESSION_TICKET=$session_authenticated_ticket\")\n";
+
+exit 0;
+
+sub CreateDigest ($) {
+    my ($data) = @_;
+
+    my $pid = open2(\*MD5out, \*MD5in, "/usr/bin/md5sum -")
+	or die "you'll need /usr/bin/md5sum installed";
+
+    my $oldfd = select MD5in; $|=1; select $oldfd;
+    print MD5in "$data";
+    close MD5in;
+    my $reply = <MD5out>;
+    ($reply) = split /\s/, $reply;
+    print STDERR "server: ". "md5 said: <$reply>\n";
+    close MD5out;
+
+    return $reply;
+}
+
+sub ReadBinaryPrompt ($) {
+    my ($fd) = @_;
+
+    my $buffer = "     ";
+    my $count = read($fd, $buffer, 5);
+    if ($count == 0) {
+	# no more packets to read
+	return (0, "");
+    }
+
+    if ($count != 5) {
+	# broken packet header
+	return (-1, "");
+    }
+
+    my ($length, $control) = unpack("N C", $buffer);
+    if ($length < 5) {
+	# broken packet length
+	return (-1, "");
+    }
+
+    my $data = "";
+    $length -= 5;
+    while ($count = read($fd, $buffer, $length)) {
+	$data .= $buffer;
+	if ($count != $length) {
+	    $length -= $count;
+	    next;
+	}
+
+	print STDERR "server: ". "data is [$data]\n";
+
+	return ($control, $data);
+    }
+
+    # broken packet data
+    return (-1, "");
+}
+
+sub WriteBinaryPrompt ($$$) {
+    my ($fd, $control, $data) = @_;
+
+    my $length = 5 + length($data);
+    printf STDERR "server: ". "{%d|0x%.2x|%s}\n", $length, $control, $data;
+    my $bp = pack("N C a*", $length, $control, $data);
+    print $fd $bp;
+
+    print STDERR "server: ". "control passed to agent\@here\n";
+}
+
+sub IdentifyLocalSecret ($) {
+    my ($identifier) = @_;
+    my $secret;
+
+    my $whoami = `/usr/bin/whoami` ; chomp $whoami;
+    if (open SECRETS, "< " .(getpwuid($<))[7]. "/.secret\@here") {
+	my $line;
+	while (defined ($line = <SECRETS>)) {
+	    my ($id, $sec) = split /[\s]/, $line;
+	    if ((defined $id) && ($id eq $identifier)) {
+		$secret = $sec;
+		last;
+	    }
+	}
+	close SECRETS;
+    }
+
+    return $secret;
+}