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-rw-r--r--libpamc/License41
-rw-r--r--libpamc/Makefile.am24
-rw-r--r--libpamc/Makefile.in889
-rw-r--r--libpamc/include/security/pam_client.h197
-rw-r--r--libpamc/libpamc.h66
-rw-r--r--libpamc/libpamc.map12
-rw-r--r--libpamc/pamc_client.c189
-rw-r--r--libpamc/pamc_converse.c211
-rw-r--r--libpamc/pamc_load.c477
-rw-r--r--libpamc/test/Makefile.am11
-rw-r--r--libpamc/test/Makefile.in523
-rwxr-xr-xlibpamc/test/agents/secret@here307
-rw-r--r--libpamc/test/modules/Makefile9
-rw-r--r--libpamc/test/modules/pam_secret.c669
-rw-r--r--libpamc/test/regress/Makefile7
-rwxr-xr-xlibpamc/test/regress/run_test.sh6
-rw-r--r--libpamc/test/regress/test.libpamc.c343
-rwxr-xr-xlibpamc/test/regress/test.secret@here151
18 files changed, 4132 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..85c9ce7
--- /dev/null
+++ b/libpamc/Makefile.am
@@ -0,0 +1,24 @@
+#
+# 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
diff --git a/libpamc/Makefile.in b/libpamc/Makefile.in
new file mode 100644
index 0000000..47cb303
--- /dev/null
+++ b/libpamc/Makefile.in
@@ -0,0 +1,889 @@
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+# even the implied warranty of MERCHANTABILITY or FITNESS FOR A
+# PARTICULAR PURPOSE.
+
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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_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..a88da2f
--- /dev/null
+++ b/libpamc/test/Makefile.in
@@ -0,0 +1,523 @@
+# Makefile.in generated by automake 1.16.1 from Makefile.am.
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+
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+
+# This Makefile.in is free software; the Free Software Foundation
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+# but WITHOUT ANY WARRANTY, to the extent permitted by law; without
+# even the implied warranty of MERCHANTABILITY or FITNESS FOR A
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+ 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
+
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+
+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:
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+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;
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-26 16:03:42 +0000