Adding upstream version 1.4.0.upstream/1.4.0upstream

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

1 files changed, 891 insertions, 0 deletions

diff --git a/modules/pam_env/pam_env.c b/modules/pam_env/pam_env.c
new file mode 100644
index 0000000..79d4372
--- /dev/null
+++ b/modules/pam_env/pam_env.c
@@ -0,0 +1,891 @@
+/*
+ * pam_env module
+ *
+ * Written by Dave Kinchlea <kinch@kinch.ark.com> 1997/01/31
+ * Inspired by Andrew Morgan <morgan@kernel.org>, who also supplied the
+ * template for this file (via pam_mail)
+ */
+
+#define DEFAULT_ETC_ENVFILE     "/etc/environment"
+#define DEFAULT_READ_ENVFILE    1
+
+#define DEFAULT_USER_ENVFILE    ".pam_environment"
+#define DEFAULT_USER_READ_ENVFILE 0
+
+#include "config.h"
+
+#include <ctype.h>
+#include <errno.h>
+#include <pwd.h>
+#include <stdarg.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <syslog.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+#include <security/pam_modules.h>
+#include <security/pam_modutil.h>
+#include <security/_pam_macros.h>
+#include <security/pam_ext.h>
+#include "pam_inline.h"
+
+/* This little structure makes it easier to keep variables together */
+
+typedef struct var {
+  char *name;
+  char *value;
+  char *defval;
+  char *override;
+} VAR;
+
+#define BUF_SIZE 8192
+#define MAX_ENV  8192
+
+#define GOOD_LINE    0
+#define BAD_LINE     100       /* This must be > the largest PAM_* error code */
+
+#define DEFINE_VAR   101
+#define UNDEFINE_VAR 102
+#define ILLEGAL_VAR  103
+
+static int  _assemble_line(FILE *, char *, int);
+static int  _parse_line(const pam_handle_t *, const char *, VAR *);
+static int  _check_var(pam_handle_t *, VAR *);           /* This is the real meat */
+static void _clean_var(VAR *);
+static int  _expand_arg(pam_handle_t *, char **);
+static const char * _pam_get_item_byname(pam_handle_t *, const char *);
+static int  _define_var(pam_handle_t *, int, VAR *);
+static int  _undefine_var(pam_handle_t *, int, VAR *);
+
+/* This is a special value used to designate an empty string */
+static char quote='\0';
+
+/* argument parsing */
+
+#define PAM_DEBUG_ARG       0x01
+
+static int
+_pam_parse (const pam_handle_t *pamh, int argc, const char **argv,
+	    const char **conffile, const char **envfile, int *readenv,
+	    const char **user_envfile, int *user_readenv)
+{
+    int ctrl=0;
+
+    *user_envfile = DEFAULT_USER_ENVFILE;
+    *envfile = DEFAULT_ETC_ENVFILE;
+    *readenv = DEFAULT_READ_ENVFILE;
+    *user_readenv = DEFAULT_USER_READ_ENVFILE;
+    *conffile = DEFAULT_CONF_FILE;
+
+    /* step through arguments */
+    for (; argc-- > 0; ++argv) {
+	const char *str;
+
+	/* generic options */
+
+	if (!strcmp(*argv,"debug"))
+	    ctrl |= PAM_DEBUG_ARG;
+	else if ((str = pam_str_skip_prefix(*argv, "conffile=")) != NULL) {
+	  if (str[0] == '\0') {
+	    pam_syslog(pamh, LOG_ERR,
+		       "conffile= specification missing argument - ignored");
+	  } else {
+	    *conffile = str;
+	    D(("new Configuration File: %s", *conffile));
+	  }
+	} else if ((str = pam_str_skip_prefix(*argv, "envfile=")) != NULL) {
+	  if (str[0] == '\0') {
+	    pam_syslog (pamh, LOG_ERR,
+			"envfile= specification missing argument - ignored");
+	  } else {
+	    *envfile = str;
+	    D(("new Env File: %s", *envfile));
+	  }
+	} else if ((str = pam_str_skip_prefix(*argv, "user_envfile=")) != NULL) {
+	  if (str[0] == '\0') {
+	    pam_syslog (pamh, LOG_ERR,
+			"user_envfile= specification missing argument - ignored");
+	  } else {
+	    *user_envfile = str;
+	    D(("new User Env File: %s", *user_envfile));
+	  }
+	} else if ((str = pam_str_skip_prefix(*argv, "readenv=")) != NULL) {
+	  *readenv = atoi(str);
+	} else if ((str = pam_str_skip_prefix(*argv, "user_readenv=")) != NULL) {
+	  *user_readenv = atoi(str);
+	} else
+	  pam_syslog(pamh, LOG_ERR, "unknown option: %s", *argv);
+    }
+
+    return ctrl;
+}
+
+static int
+_parse_config_file(pam_handle_t *pamh, int ctrl, const char *file)
+{
+    int retval;
+    char buffer[BUF_SIZE];
+    FILE *conf;
+    VAR Var, *var=&Var;
+
+    D(("Called."));
+
+    var->name=NULL; var->defval=NULL; var->override=NULL;
+
+    D(("Config file name is: %s", file));
+
+    /*
+     * Lets try to open the config file, parse it and process
+     * any variables found.
+     */
+
+    if ((conf = fopen(file,"r")) == NULL) {
+      pam_syslog(pamh, LOG_ERR, "Unable to open config file: %s: %m", file);
+      return PAM_IGNORE;
+    }
+
+    /* _pam_assemble_line will provide a complete line from the config file,
+     * with all comments removed and any escaped newlines fixed up
+     */
+
+    while (( retval = _assemble_line(conf, buffer, BUF_SIZE)) > 0) {
+      D(("Read line: %s", buffer));
+
+      if ((retval = _parse_line(pamh, buffer, var)) == GOOD_LINE) {
+	retval = _check_var(pamh, var);
+
+	if (DEFINE_VAR == retval) {
+	  retval = _define_var(pamh, ctrl, var);
+
+	} else if (UNDEFINE_VAR == retval) {
+	  retval = _undefine_var(pamh, ctrl, var);
+	}
+      }
+      if (PAM_SUCCESS != retval && ILLEGAL_VAR != retval
+	  && BAD_LINE != retval && PAM_BAD_ITEM != retval) break;
+
+      _clean_var(var);
+
+    }  /* while */
+
+    (void) fclose(conf);
+
+    /* tidy up */
+    _clean_var(var);        /* We could have got here prematurely,
+			     * this is safe though */
+    D(("Exit."));
+    return (retval != 0 ? PAM_ABORT : PAM_SUCCESS);
+}
+
+static int
+_parse_env_file(pam_handle_t *pamh, int ctrl, const char *file)
+{
+    int retval=PAM_SUCCESS, i, t;
+    char buffer[BUF_SIZE], *key, *mark;
+    FILE *conf;
+
+    D(("Env file name is: %s", file));
+
+    if ((conf = fopen(file,"r")) == NULL) {
+      pam_syslog(pamh, LOG_ERR, "Unable to open env file: %s: %m", file);
+      return PAM_IGNORE;
+    }
+
+    while (_assemble_line(conf, buffer, BUF_SIZE) > 0) {
+	D(("Read line: %s", buffer));
+	key = buffer;
+
+	/* skip leading white space */
+	key += strspn(key, " \n\t");
+
+	/* skip blanks lines and comments */
+	if (key[0] == '#')
+	    continue;
+
+	/* skip over "export " if present so we can be compat with
+	   bash type declarations */
+	if (strncmp(key, "export ", (size_t) 7) == 0)
+	    key += 7;
+
+	/* now find the end of value */
+	mark = key;
+	while(mark[0] != '\n' && mark[0] != '#' && mark[0] != '\0')
+	    mark++;
+	if (mark[0] != '\0')
+	    mark[0] = '\0';
+
+       /*
+	* sanity check, the key must be alphanumeric
+	*/
+
+	if (key[0] == '=') {
+		pam_syslog(pamh, LOG_ERR,
+		           "missing key name '%s' in %s', ignoring",
+		           key, file);
+		continue;
+	}
+
+	for ( i = 0 ; key[i] != '=' && key[i] != '\0' ; i++ )
+	    if (!isalnum(key[i]) && key[i] != '_') {
+		pam_syslog(pamh, LOG_ERR,
+		           "non-alphanumeric key '%s' in %s', ignoring",
+		           key, file);
+		break;
+	    }
+	/* non-alphanumeric key, ignore this line */
+	if (key[i] != '=' && key[i] != '\0')
+	    continue;
+
+	/* now we try to be smart about quotes around the value,
+	   but not too smart, we can't get all fancy with escaped
+	   values like bash */
+	if (key[i] == '=' && (key[++i] == '\"' || key[i] == '\'')) {
+	    for ( t = i+1 ; key[t] != '\0' ; t++)
+		if (key[t] != '\"' && key[t] != '\'')
+		    key[i++] = key[t];
+		else if (key[t+1] != '\0')
+		    key[i++] = key[t];
+	    key[i] = '\0';
+	}
+
+	/* if this is a request to delete a variable, check that it's
+	   actually set first, so we don't get a vague error back from
+	   pam_putenv() */
+	for (i = 0; key[i] != '=' && key[i] != '\0'; i++);
+
+	if (key[i] == '\0' && !pam_getenv(pamh,key))
+	    continue;
+
+	/* set the env var, if it fails, we break out of the loop */
+	retval = pam_putenv(pamh, key);
+	if (retval != PAM_SUCCESS) {
+	    D(("error setting env \"%s\"", key));
+	    break;
+	} else if (ctrl & PAM_DEBUG_ARG) {
+	    pam_syslog(pamh, LOG_DEBUG,
+		       "pam_putenv(\"%s\")", key);
+	}
+    }
+
+    (void) fclose(conf);
+
+    /* tidy up */
+    D(("Exit."));
+    return retval;
+}
+
+/*
+ * This is where we read a line of the PAM config file. The line may be
+ * preceded by lines of comments and also extended with "\\\n"
+ */
+
+static int _assemble_line(FILE *f, char *buffer, int buf_len)
+{
+    char *p = buffer;
+    char *s, *os;
+    int used = 0;
+    int whitespace;
+
+    /* loop broken with a 'break' when a non-'\\n' ended line is read */
+
+    D(("called."));
+    for (;;) {
+	if (used >= buf_len) {
+	    /* Overflow */
+	    D(("_assemble_line: overflow"));
+	    return -1;
+	}
+	if (fgets(p, buf_len - used, f) == NULL) {
+	    if (used) {
+		/* Incomplete read */
+		return -1;
+	    } else {
+		/* EOF */
+		return 0;
+	    }
+	}
+	if (p[0] == '\0') {
+	    D(("_assemble_line: corrupted or binary file"));
+	    return -1;
+	}
+	if (p[strlen(p)-1] != '\n') {
+	    D(("_assemble_line: line too long"));
+	    return -1;
+	}
+
+	/* skip leading spaces --- line may be blank */
+
+	whitespace = strspn(p, " \n\t");
+	s = p + whitespace;
+	if (*s && (*s != '#')) {
+	    used += whitespace;
+	    os = s;
+
+	    /*
+	     * we are only interested in characters before the first '#'
+	     * character
+	     */
+
+	    while (*s && *s != '#')
+		 ++s;
+	    if (*s == '#') {
+		 *s = '\0';
+		 used += strlen(os);
+		 break;                /* the line has been read */
+	    }
+
+	    s = os;
+
+	    /*
+	     * Check for backslash by scanning back from the end of
+	     * the entered line, the '\n' has been included since
+	     * normally a line is terminated with this
+	     * character. fgets() should only return one though!
+	     */
+
+	    s += strlen(s);
+	    while (s > os && ((*--s == ' ') || (*s == '\t')
+			      || (*s == '\n')));
+
+	    /* check if it ends with a backslash */
+	    if (*s == '\\') {
+		*s = '\0';              /* truncate the line here */
+		used += strlen(os);
+		p = s;                  /* there is more ... */
+	    } else {
+		/* End of the line! */
+		used += strlen(os);
+		break;                  /* this is the complete line */
+	    }
+
+	} else {
+	    /* Nothing in this line */
+	    /* Don't move p         */
+	}
+    }
+
+    return used;
+}
+
+static int
+_parse_line (const pam_handle_t *pamh, const char *buffer, VAR *var)
+{
+  /*
+   * parse buffer into var, legal syntax is
+   * VARIABLE [DEFAULT=[[string]] [OVERRIDE=[value]]
+   *
+   * Any other options defined make this a bad line,
+   * error logged and no var set
+   */
+
+  int length, quoteflg=0;
+  const char *ptr, *tmpptr;
+  char **valptr;
+
+  D(("Called buffer = <%s>", buffer));
+
+  length = strcspn(buffer," \t\n");
+
+  if ((var->name = malloc(length + 1)) == NULL) {
+    pam_syslog(pamh, LOG_CRIT, "Couldn't malloc %d bytes", length+1);
+    return PAM_BUF_ERR;
+  }
+
+  /*
+   * The first thing on the line HAS to be the variable name,
+   * it may be the only thing though.
+   */
+  strncpy(var->name, buffer, length);
+  var->name[length] = '\0';
+  D(("var->name = <%s>, length = %d", var->name, length));
+
+  /*
+   * Now we check for arguments, we only support two kinds and ('cause I am lazy)
+   * each one can actually be listed any number of times
+   */
+
+  ptr = buffer+length;
+  while ((length = strspn(ptr, " \t")) > 0) {
+    ptr += length;                              /* remove leading whitespace */
+    D((ptr));
+    if ((tmpptr = pam_str_skip_prefix(ptr, "DEFAULT=")) != NULL) {
+      ptr = tmpptr;
+      D(("Default arg found: <%s>", ptr));
+      valptr=&(var->defval);
+    } else if ((tmpptr = pam_str_skip_prefix(ptr, "OVERRIDE=")) != NULL) {
+      ptr = tmpptr;
+      D(("Override arg found: <%s>", ptr));
+      valptr=&(var->override);
+    } else {
+      D(("Unrecognized options: <%s> - ignoring line", ptr));
+      pam_syslog(pamh, LOG_ERR, "Unrecognized Option: %s - ignoring line", ptr);
+      return BAD_LINE;
+    }
+
+    if ('"' != *ptr) {       /* Escaped quotes not supported */
+      length = strcspn(ptr, " \t\n");
+      tmpptr = ptr+length;
+    } else {
+      tmpptr = strchr(++ptr, '"');
+      if (!tmpptr) {
+	D(("Unterminated quoted string: %s", ptr-1));
+	pam_syslog(pamh, LOG_ERR, "Unterminated quoted string: %s", ptr-1);
+	return BAD_LINE;
+      }
+      length = tmpptr - ptr;
+      if (*++tmpptr && ' ' != *tmpptr && '\t' != *tmpptr && '\n' != *tmpptr) {
+	D(("Quotes must cover the entire string: <%s>", ptr));
+	pam_syslog(pamh, LOG_ERR, "Quotes must cover the entire string: <%s>", ptr);
+	return BAD_LINE;
+      }
+      quoteflg++;
+    }
+    if (length) {
+      if ((*valptr = malloc(length + 1)) == NULL) {
+	D(("Couldn't malloc %d bytes", length+1));
+	pam_syslog(pamh, LOG_CRIT, "Couldn't malloc %d bytes", length+1);
+	return PAM_BUF_ERR;
+      }
+      (void)strncpy(*valptr,ptr,length);
+      (*valptr)[length]='\0';
+    } else if (quoteflg--) {
+      *valptr = &quote;      /* a quick hack to handle the empty string */
+    }
+    ptr = tmpptr;         /* Start the search where we stopped */
+  } /* while */
+
+  /*
+   * The line is parsed, all is well.
+   */
+
+  D(("Exit."));
+  ptr = NULL; tmpptr = NULL; valptr = NULL;
+  return GOOD_LINE;
+}
+
+static int _check_var(pam_handle_t *pamh, VAR *var)
+{
+  /*
+   * Examine the variable and determine what action to take.
+   * Returns DEFINE_VAR, UNDEFINE_VAR depending on action to take
+   * or a PAM_* error code if passed back from other routines
+   *
+   * if no DEFAULT provided, the empty string is assumed
+   * if no OVERRIDE provided, the empty string is assumed
+   * if DEFAULT=  and OVERRIDE evaluates to the empty string,
+   *    this variable should be undefined
+   * if DEFAULT=""  and OVERRIDE evaluates to the empty string,
+   *    this variable should be defined with no value
+   * if OVERRIDE=value   and value turns into the empty string, DEFAULT is used
+   *
+   * If DEFINE_VAR is to be returned, the correct value to define will
+   * be pointed to by var->value
+   */
+
+  int retval;
+
+  D(("Called."));
+
+  /*
+   * First thing to do is to expand any arguments, but only
+   * if they are not the special quote values (cause expand_arg
+   * changes memory).
+   */
+
+  if (var->defval && (&quote != var->defval) &&
+      ((retval = _expand_arg(pamh, &(var->defval))) != PAM_SUCCESS)) {
+      return retval;
+  }
+  if (var->override && (&quote != var->override) &&
+      ((retval = _expand_arg(pamh, &(var->override))) != PAM_SUCCESS)) {
+    return retval;
+  }
+
+  /* Now its easy */
+
+  if (var->override && *(var->override)) {
+    /* if there is a non-empty string in var->override, we use it */
+    D(("OVERRIDE variable <%s> being used: <%s>", var->name, var->override));
+    var->value = var->override;
+    retval = DEFINE_VAR;
+  } else {
+
+    var->value = var->defval;
+    if (&quote == var->defval) {
+      /*
+       * This means that the empty string was given for defval value
+       * which indicates that a variable should be defined with no value
+       */
+      D(("An empty variable: <%s>", var->name));
+      retval = DEFINE_VAR;
+    } else if (var->defval) {
+      D(("DEFAULT variable <%s> being used: <%s>", var->name, var->defval));
+      retval = DEFINE_VAR;
+    } else {
+      D(("UNDEFINE variable <%s>", var->name));
+      retval = UNDEFINE_VAR;
+    }
+  }
+
+  D(("Exit."));
+  return retval;
+}
+
+static int _expand_arg(pam_handle_t *pamh, char **value)
+{
+  const char *orig=*value, *tmpptr=NULL;
+  char *ptr;       /*
+		    * Sure would be nice to use tmpptr but it needs to be
+		    * a constant so that the compiler will shut up when I
+		    * call pam_getenv and _pam_get_item_byname -- sigh
+		    */
+
+  /* No unexpanded variable can be bigger than BUF_SIZE */
+  char type, tmpval[BUF_SIZE];
+
+  /* I know this shouldn't be hard-coded but it's so much easier this way */
+  char tmp[MAX_ENV];
+  size_t idx;
+
+  D(("Remember to initialize tmp!"));
+  memset(tmp, 0, MAX_ENV);
+  idx = 0;
+
+  /*
+   * (possibly non-existent) environment variables can be used as values
+   * by prepending a "$" and wrapping in {} (ie: ${HOST}), can escape with "\"
+   * (possibly non-existent) PAM items can be used as values
+   * by prepending a "@" and wrapping in {} (ie: @{PAM_RHOST}, can escape
+   *
+   */
+  D(("Expanding <%s>",orig));
+  while (*orig) {     /* while there is some input to deal with */
+    if ('\\' == *orig) {
+      ++orig;
+      if ('$' != *orig && '@' != *orig) {
+	D(("Unrecognized escaped character: <%c> - ignoring", *orig));
+	pam_syslog(pamh, LOG_ERR,
+		   "Unrecognized escaped character: <%c> - ignoring",
+		   *orig);
+      } else if (idx + 1 < MAX_ENV) {
+	tmp[idx++] = *orig++;        /* Note the increment */
+      } else {
+	/* is it really a good idea to try to log this? */
+	D(("Variable buffer overflow: <%s> + <%s>", tmp, tmpptr));
+	pam_syslog (pamh, LOG_ERR, "Variable buffer overflow: <%s> + <%s>",
+		 tmp, tmpptr);
+	return PAM_BUF_ERR;
+      }
+      continue;
+    }
+    if ('$' == *orig || '@' == *orig) {
+      if ('{' != *(orig+1)) {
+	D(("Expandable variables must be wrapped in {}"
+	   " <%s> - ignoring", orig));
+	pam_syslog(pamh, LOG_ERR, "Expandable variables must be wrapped in {}"
+		 " <%s> - ignoring", orig);
+	if (idx + 1 < MAX_ENV) {
+	  tmp[idx++] = *orig++;        /* Note the increment */
+	}
+	continue;
+      } else {
+	D(("Expandable argument: <%s>", orig));
+	type = *orig;
+	orig+=2;     /* skip the ${ or @{ characters */
+	ptr = strchr(orig, '}');
+	if (ptr) {
+	  *ptr++ = '\0';
+	} else {
+	  D(("Unterminated expandable variable: <%s>", orig-2));
+	  pam_syslog(pamh, LOG_ERR,
+		     "Unterminated expandable variable: <%s>", orig-2);
+	  return PAM_ABORT;
+	}
+	strncpy(tmpval, orig, sizeof(tmpval));
+	tmpval[sizeof(tmpval)-1] = '\0';
+	orig=ptr;
+	/*
+	 * so, we know we need to expand tmpval, it is either
+	 * an environment variable or a PAM_ITEM. type will tell us which
+	 */
+	switch (type) {
+
+	case '$':
+	  D(("Expanding env var: <%s>",tmpval));
+	  tmpptr = pam_getenv(pamh, tmpval);
+	  D(("Expanded to <%s>", tmpptr));
+	  break;
+
+	case '@':
+	  D(("Expanding pam item: <%s>",tmpval));
+	  tmpptr = _pam_get_item_byname(pamh, tmpval);
+	  D(("Expanded to <%s>", tmpptr));
+	  break;
+
+	default:
+	  D(("Impossible error, type == <%c>", type));
+	  pam_syslog(pamh, LOG_CRIT, "Impossible error, type == <%c>", type);
+	  return PAM_ABORT;
+	}         /* switch */
+
+	if (tmpptr) {
+	  size_t len = strlen(tmpptr);
+	  if (idx + len < MAX_ENV) {
+	    strcpy(tmp + idx, tmpptr);
+	    idx += len;
+	  } else {
+	    /* is it really a good idea to try to log this? */
+	    D(("Variable buffer overflow: <%s> + <%s>", tmp, tmpptr));
+	    pam_syslog (pamh, LOG_ERR,
+			"Variable buffer overflow: <%s> + <%s>", tmp, tmpptr);
+	    return PAM_BUF_ERR;
+	  }
+	}
+      }           /* if ('{' != *orig++) */
+    } else {      /* if ( '$' == *orig || '@' == *orig) */
+      if (idx + 1 < MAX_ENV) {
+	tmp[idx++] = *orig++;        /* Note the increment */
+      } else {
+	/* is it really a good idea to try to log this? */
+	D(("Variable buffer overflow: <%s> + <%s>", tmp, tmpptr));
+	pam_syslog(pamh, LOG_ERR,
+		   "Variable buffer overflow: <%s> + <%s>", tmp, tmpptr);
+	return PAM_BUF_ERR;
+      }
+    }
+  }              /* for (;*orig;) */
+
+  if (idx > strlen(*value)) {
+    free(*value);
+    if ((*value = malloc(idx + 1)) == NULL) {
+      D(("Couldn't malloc %d bytes for expanded var", idx + 1));
+      pam_syslog (pamh, LOG_CRIT, "Couldn't malloc %lu bytes for expanded var",
+	       (unsigned long)idx+1);
+      return PAM_BUF_ERR;
+    }
+  }
+  strcpy(*value, tmp);
+  memset(tmp, '\0', sizeof(tmp));
+  D(("Exit."));
+
+  return PAM_SUCCESS;
+}
+
+static const char * _pam_get_item_byname(pam_handle_t *pamh, const char *name)
+{
+  /*
+   * This function just allows me to use names as given in the config
+   * file and translate them into the appropriate PAM_ITEM macro
+   */
+
+  int item;
+  const void *itemval;
+
+  D(("Called."));
+  if (strcmp(name, "PAM_USER") == 0 || strcmp(name, "HOME") == 0 || strcmp(name, "SHELL") == 0) {
+    item = PAM_USER;
+  } else if (strcmp(name, "PAM_USER_PROMPT") == 0) {
+    item = PAM_USER_PROMPT;
+  } else if (strcmp(name, "PAM_TTY") == 0) {
+    item = PAM_TTY;
+  } else if (strcmp(name, "PAM_RUSER") == 0) {
+    item = PAM_RUSER;
+  } else if (strcmp(name, "PAM_RHOST") == 0) {
+    item = PAM_RHOST;
+  } else {
+    D(("Unknown PAM_ITEM: <%s>", name));
+    pam_syslog (pamh, LOG_ERR, "Unknown PAM_ITEM: <%s>", name);
+    return NULL;
+  }
+
+  if (pam_get_item(pamh, item, &itemval) != PAM_SUCCESS) {
+    D(("pam_get_item failed"));
+    return NULL;     /* let pam_get_item() log the error */
+  }
+
+  if (itemval && (strcmp(name, "HOME") == 0 || strcmp(name, "SHELL") == 0)) {
+    struct passwd *user_entry;
+    user_entry = pam_modutil_getpwnam (pamh, itemval);
+    if (!user_entry) {
+      pam_syslog(pamh, LOG_ERR, "No such user!?");
+      return NULL;
+    }
+    return (strcmp(name, "SHELL") == 0) ?
+      user_entry->pw_shell :
+      user_entry->pw_dir;
+  }
+
+  D(("Exit."));
+  return itemval;
+}
+
+static int _define_var(pam_handle_t *pamh, int ctrl, VAR *var)
+{
+  /* We have a variable to define, this is a simple function */
+
+  char *envvar;
+  int retval = PAM_SUCCESS;
+
+  D(("Called."));
+  if (asprintf(&envvar, "%s=%s", var->name, var->value) < 0) {
+    pam_syslog(pamh, LOG_CRIT, "out of memory");
+    return PAM_BUF_ERR;
+  }
+
+  retval = pam_putenv(pamh, envvar);
+  if (ctrl & PAM_DEBUG_ARG) {
+    pam_syslog(pamh, LOG_DEBUG, "pam_putenv(\"%s\")", envvar);
+  }
+  _pam_drop(envvar);
+  D(("Exit."));
+  return retval;
+}
+
+static int _undefine_var(pam_handle_t *pamh, int ctrl, VAR *var)
+{
+  /* We have a variable to undefine, this is a simple function */
+
+  D(("Called and exit."));
+  if (ctrl & PAM_DEBUG_ARG) {
+    pam_syslog(pamh, LOG_DEBUG, "remove variable \"%s\"", var->name);
+  }
+  return pam_putenv(pamh, var->name);
+}
+
+static void   _clean_var(VAR *var)
+{
+    if (var->name) {
+      free(var->name);
+    }
+    if (var->defval && (&quote != var->defval)) {
+      free(var->defval);
+    }
+    if (var->override && (&quote != var->override)) {
+      free(var->override);
+    }
+    var->name = NULL;
+    var->value = NULL;    /* never has memory specific to it */
+    var->defval = NULL;
+    var->override = NULL;
+    return;
+}
+
+
+
+/* --- authentication management functions (only) --- */
+
+int
+pam_sm_authenticate (pam_handle_t *pamh UNUSED, int flags UNUSED,
+		     int argc UNUSED, const char **argv UNUSED)
+{
+  return PAM_IGNORE;
+}
+
+static int
+handle_env (pam_handle_t *pamh, int argc, const char **argv)
+{
+  int retval, ctrl, readenv=DEFAULT_READ_ENVFILE;
+  int user_readenv = DEFAULT_USER_READ_ENVFILE;
+  const char *conf_file = NULL, *env_file = NULL, *user_env_file = NULL;
+
+  /*
+   * this module sets environment variables read in from a file
+   */
+
+  D(("Called."));
+  ctrl = _pam_parse(pamh, argc, argv, &conf_file, &env_file,
+		    &readenv, &user_env_file, &user_readenv);
+
+  retval = _parse_config_file(pamh, ctrl, conf_file);
+
+  if(readenv && retval == PAM_SUCCESS) {
+    retval = _parse_env_file(pamh, ctrl, env_file);
+    if (retval == PAM_IGNORE)
+      retval = PAM_SUCCESS;
+  }
+
+  if(user_readenv && retval == PAM_SUCCESS) {
+    char *envpath = NULL;
+    struct passwd *user_entry = NULL;
+    const char *username;
+    struct stat statbuf;
+
+    username = _pam_get_item_byname(pamh, "PAM_USER");
+
+    if (username)
+      user_entry = pam_modutil_getpwnam (pamh, username);
+    if (!user_entry) {
+      pam_syslog(pamh, LOG_ERR, "No such user!?");
+    }
+    else {
+      if (asprintf(&envpath, "%s/%s", user_entry->pw_dir, user_env_file) < 0)
+	{
+	  pam_syslog(pamh, LOG_CRIT, "Out of memory");
+	  return PAM_BUF_ERR;
+	}
+      if (stat(envpath, &statbuf) == 0) {
+	PAM_MODUTIL_DEF_PRIVS(privs);
+
+	if (pam_modutil_drop_priv(pamh, &privs, user_entry)) {
+	  retval = PAM_SESSION_ERR;
+	} else {
+	  retval = _parse_config_file(pamh, ctrl, envpath);
+	  if (pam_modutil_regain_priv(pamh, &privs))
+	    retval = PAM_SESSION_ERR;
+	}
+        if (retval == PAM_IGNORE)
+          retval = PAM_SUCCESS;
+      }
+      free(envpath);
+    }
+  }
+
+  /* indicate success or failure */
+  D(("Exit."));
+  return retval;
+}
+
+int
+pam_sm_acct_mgmt (pam_handle_t *pamh UNUSED, int flags UNUSED,
+		  int argc UNUSED, const char **argv UNUSED)
+{
+  pam_syslog (pamh, LOG_NOTICE, "pam_sm_acct_mgmt called inappropriately");
+  return PAM_SERVICE_ERR;
+}
+
+int
+pam_sm_setcred (pam_handle_t *pamh, int flags UNUSED,
+		int argc, const char **argv)
+{
+  D(("Called"));
+  return handle_env (pamh, argc, argv);
+}
+
+int
+pam_sm_open_session (pam_handle_t *pamh, int flags UNUSED,
+		     int argc, const char **argv)
+{
+  D(("Called"));
+  return handle_env (pamh, argc, argv);
+}
+
+int
+pam_sm_close_session (pam_handle_t *pamh UNUSED, int flags UNUSED,
+		      int argc UNUSED, const char **argv UNUSED)
+{
+  D(("Called and Exit"));
+  return PAM_SUCCESS;
+}
+
+int
+pam_sm_chauthtok (pam_handle_t *pamh UNUSED, int flags UNUSED,
+		  int argc UNUSED, const char **argv UNUSED)
+{
+  pam_syslog (pamh, LOG_NOTICE, "pam_sm_chauthtok called inappropriately");
+  return PAM_SERVICE_ERR;
+}
+
+/* end of module definition */