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|
/* pam_mail module */
/*
* $Id: pam_env.c,v 1.1 1997/04/05 06:42:35 morgan Exp morgan $
*
* Written by Dave Kinchlea <kinch@kinch.ark.com> 1997/01/31
* Inspired by Andrew Morgan <morgan@parc.power.net, who also supplied the
* template for this file (via pam_mail)
*
* $Log: pam_env.c,v $
* Revision 1.1 1997/04/05 06:42:35 morgan
* Initial revision
*
* Revision 0.6 1997/02/04 17:58:27 kinch
* Debugging code cleaned up, lots added (whereever _log_err called) some removed
*
* Revision 0.5 1997/02/04 17:20:30 kinch
* Changed default config file
* Removed bogus message in pam_sm_authenticate()
* Added back support in pam_sm_session(), this could conceivably be used
* both as an auth_setcred and a session module
*
* Revision 0.4 1997/02/04 07:34:15 kinch
* Fixed dealing with escaped '$' and '@' characters
* This is now an pam_sm_setcred module to work closer to the RFC model
* though this whole thing seems to have little to do with Authentication
*
* Revision 0.3 1997/02/04 04:53:15 kinch
* Removed bogus space in PAM_ENV_SILENT
* Removed line that added a space when allowing for escaped newlines, that
* is not what we want at all, if we want a space, we can add one.
* Changed a PAM_ABORT to PAM_BUF_ERR for a malloc failure
* Changed bogus PAM_RUSER to PAM_RHOST
*
* Revision 0.2 1997/02/03 23:31:26 kinch
* Lots of D(()) debugging code added, probably too much actually.
* This now seems to work for all cases I can think of
* Lots of little code changes but nothing major and no function
* interface changes, largest change has to do with adding the
* logic to get "e hack to make it through all the code. Probably
* ought to have done this with a global flag for each of defval and
* override - it would have been cleaner.
*
* Revision 0.1 1997/02/03 01:39:06 kinch
* Initial code, it compiles cleanly but has not been tested at all.
*
*/
#ifndef DEFAULT_CONF_FILE
#define DEFAULT_CONF_FILE "/etc/security/pam_env.conf"
#endif
#ifdef linux
#define _GNU_SOURCE
#include <features.h>
#endif
#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>
#ifdef WANT_PWDB
#include <pwdb/pwdb_public.h>
#endif
/*
* here, we make a definition for the externally accessible function
* in this file (this definition is required for static a module
* but strongly encouraged generally) it is used to instruct the
* modules include file to define the function prototypes.
*/
#define PAM_SM_AUTH /* This is primarily a AUTH_SETCRED module */
#define PAM_SM_SESSION /* But I like to be friendly */
#define PAM_SM_PASSWORD /* "" */
#define PAM_SM_ACCOUNT /* "" */
#include <security/pam_modules.h>
#include <security/_pam_macros.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 1024
#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(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 *, VAR *);
static int _undefine_var(pam_handle_t *, VAR *);
/* This is a flag used to designate an empty string */
static char quote='Z';
/* some syslogging */
static void _log_err(int err, const char *format, ...)
{
va_list args;
va_start(args, format);
openlog("PAM-env", LOG_CONS|LOG_PID, LOG_AUTH);
vsyslog(err, format, args);
va_end(args);
closelog();
}
/* argument parsing */
#define PAM_DEBUG_ARG 01
#define PAM_NEW_CONF_FILE 02
#define PAM_ENV_SILENT 04
static int _pam_parse(int flags, int argc, const char **argv, char **conffile)
{
int ctrl=0;
/* step through arguments */
for (; argc-- > 0; ++argv) {
/* generic options */
if (!strcmp(*argv,"debug"))
ctrl |= PAM_DEBUG_ARG;
else if (!strncmp(*argv,"conffile=",9)) {
*conffile = x_strdup(9+*argv);
if (*conffile != NULL) {
D(("new Configuration File: %s", *conffile));
ctrl |= PAM_NEW_CONF_FILE;
} else {
_log_err(LOG_CRIT,
"Configuration file specification missing argument - ignored");
}
} else {
_log_err(LOG_ERR,"pam_parse: unknown option; %s",*argv);
}
}
return ctrl;
}
static int _parse_config_file(pam_handle_t *pamh, int ctrl, char **conffile)
{
int retval;
const char *file;
char buffer[BUF_SIZE];
FILE *conf;
VAR Var, *var=&Var;
var->name=NULL; var->defval=NULL; var->override=NULL;
D(("Called."));
if (ctrl & PAM_NEW_CONF_FILE) {
file = *conffile;
} else {
file = DEFAULT_CONF_FILE;
}
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) {
_log_err(LOG_ERR, "Unable to open config file: %s",
strerror(errno));
return PAM_ABORT;
}
/* _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(buffer, var)) == GOOD_LINE) {
retval = _check_var(pamh, var);
if (DEFINE_VAR == retval) {
retval = _define_var(pamh, var);
} else if (UNDEFINE_VAR == retval) {
retval = _undefine_var(pamh, 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 */
_pam_overwrite(*conffile);
_pam_drop(*conffile);
file = NULL;
D(("Exit."));
return (retval<0?PAM_ABORT:PAM_SUCCESS);
}
/*
* This is where we read a line of the PAM config file. The line may be
* preceeded 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;
/* 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;
}
}
/* skip leading spaces --- line may be blank */
s = p + strspn(p, " \n\t");
if (*s && (*s != '#')) {
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(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;
char *ptr, **valptr, *tmpptr;
D(("Called buffer = <%s>", buffer));
length = strcspn(buffer," \t\n");
if ((var->name = malloc(length + 1)) == NULL) {
_log_err(LOG_ERR, "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 (strncmp(ptr,"DEFAULT=",8) == 0) {
ptr+=8;
D(("Default arg found: <%s>", ptr));
valptr=&(var->defval);
} else if (strncmp(ptr, "OVERRIDE=", 9) == 0) {
ptr+=9;
D(("Override arg found: <%s>", ptr));
valptr=&(var->override);
} else {
D(("Unrecognized options: <%s> - ignoring line", ptr));
_log_err(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));
_log_err(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));
_log_err(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));
_log_err(LOG_ERR, "Couldn't malloc %d bytes", length+1);
return PAM_BUF_ERR;
}
(void)strncpy(*valptr,ptr,length);
(*valptr)[length]='\0';
} else if (quoteflg--) {
*valptr = "e; /* 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 && ("e != var->defval) &&
((retval = _expand_arg(pamh, &(var->defval))) != PAM_SUCCESS)) {
return retval;
}
if (var->override && ("e != var->override) &&
((retval = _expand_arg(pamh, &(var->override))) != PAM_SUCCESS)) {
return retval;
}
/* Now its easy */
if (var->override && *(var->override) && "e != 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 ("e == var->defval) {
/*
* This means that the empty string was given for defval value
* which indicates that a variable should be defined with no value
*/
*var->defval = '\0';
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
*/
char type, tmpval[BUF_SIZE]; /* No unexpanded variable can be bigger than BUF_SIZE */
char tmp[MAX_ENV]; /* I know this shouldn't be hard-coded but it's so
* much easier this way */
D(("Remember to initialize tmp!"));
tmp[0] = '\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));
_log_err(LOG_ERR, "Unrecognized escaped character: <%c> - ignoring",
*orig);
} else if ((strlen(tmp) + 1) < MAX_ENV) {
tmp[strlen(tmp)] = *orig++; /* Note the increment */
} else {
/* is it really a good idea to try to log this? */
D(("Variable buffer overflow: <%s> + <%s>", tmp, tmpptr));
_log_err(LOG_ERR, "Variable buffer overflow: <%s> + <%s>", tmp, tmpptr);
}
continue;
}
if ('$' == *orig || '@' == *orig) {
if ('{' != *(orig+1)) {
D(("Expandable variables must be wrapped in {} <%s> - ignoring", orig));
_log_err(LOG_ERR, "Expandable variables must be wrapped in {} <%s> - ignoring",
orig);
if ((strlen(tmp) + 1) < MAX_ENV) {
tmp[strlen(tmp)] = *orig++; /* Note the increment */
}
continue;
} else {
D(("Expandable argument: <%s>", orig));
type = *orig;
orig+=2; /* skip the ${ or @{ characters */
ptr = strchr(orig, '}');
if (ptr) {
*ptr++ = '\0';
} else {
D(("Unterminated expandable variable: <%s>", orig-2));
_log_err(LOG_ERR, "Unterminated expandable variable: <%s>", orig-2);
return PAM_ABORT;
}
strcpy(tmpval, orig);
orig=ptr;
/*
* so, we know we need to expand tmpval, it is either
* an environment variable or a PAM_ITEM. type will tell us which
*/
switch (type) {
case '$':
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));
_log_err(LOG_CRIT, "Impossible error, type == <%c>", type);
return PAM_ABORT;
} /* switch */
if (tmpptr) {
if ((strlen(tmp) + strlen(tmpptr)) < MAX_ENV) {
strcat(tmp, tmpptr);
} else {
/* is it really a good idea to try to log this? */
D(("Variable buffer overflow: <%s> + <%s>", tmp, tmpptr));
_log_err(LOG_ERR, "Variable buffer overflow: <%s> + <%s>", tmp, tmpptr);
}
}
} /* if ('{' != *orig++) */
} else { /* if ( '$' == *orig || '@' == *orig) */
if ((strlen(tmp) + 1) < MAX_ENV) {
tmp[strlen(tmp)] = *orig++; /* Note the increment */
} else {
/* is it really a good idea to try to log this? */
D(("Variable buffer overflow: <%s> + <%s>", tmp, tmpptr));
_log_err(LOG_ERR, "Variable buffer overflow: <%s> + <%s>", tmp, tmpptr);
}
}
} /* for (;*orig;) */
if (strlen(tmp) > strlen(*value)) {
free(*value);
if ((*value = malloc(strlen(tmp) +1)) == NULL) {
D(("Couldn't malloc %d bytes for expanded var", strlen(tmp)+1));
_log_err(LOG_ERR,"Couldn't malloc %d bytes for expanded var",
strlen(tmp)+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 char *itemval;
D(("Called."));
if (strcmp(name, "PAM_USER") == 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));
_log_err(LOG_ERR, "Unknown PAM_ITEM: <%s>", name);
return NULL;
}
if (pam_get_item(pamh, item, (const void **)&itemval) != PAM_SUCCESS) {
D(("pam_get_item failed"));
return NULL; /* let pam_get_item() log the error */
}
D(("Exit."));
return itemval;
}
static int _define_var(pam_handle_t *pamh, VAR *var)
{
/* We have a variable to define, this is a simple function */
char *envvar;
int size, retval=PAM_SUCCESS;
D(("Called."));
size = strlen(var->name)+strlen(var->value)+2;
if ((envvar = malloc(size)) == NULL) {
D(("Malloc fail, size = %d", size));
_log_err(LOG_ERR, "Malloc fail, size = %d", size);
return PAM_BUF_ERR;
}
(void) sprintf(envvar,"%s=%s",var->name,var->value);
retval = pam_putenv(pamh, envvar);
free(envvar); envvar=NULL;
D(("Exit."));
return retval;
}
static int _undefine_var(pam_handle_t *pamh, VAR *var)
{
/* We have a variable to undefine, this is a simple function */
D(("Called and exit."));
return pam_putenv(pamh, var->name);
}
static void _clean_var(VAR *var)
{
if (var->name) {
free(var->name);
}
if (var->defval && ("e != var->defval)) {
free(var->defval);
}
if (var->override && ("e != 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) --- */
PAM_EXTERN
int pam_sm_authenticate(pam_handle_t *pamh, int flags, int argc,
const char **argv)
{
return PAM_IGNORE;
}
PAM_EXTERN
int pam_sm_setcred(pam_handle_t *pamh, int flags, int argc,
const char **argv)
{
int retval, ctrl;
char *conf_file=NULL;
/*
* this module sets environment variables read in from a file
*/
D(("Called."));
ctrl = _pam_parse(flags, argc, argv, &conf_file);
retval = _parse_config_file(pamh, ctrl, &conf_file);
/* indicate success or failure */
D(("Exit."));
return retval;
}
PAM_EXTERN
int pam_sm_acct_mgmt(pam_handle_t *pamh, int flags, int argc,
const char **argv)
{
_log_err(LOG_NOTICE, "pam_sm_acct_mgmt called inappropriatly");
return PAM_SERVICE_ERR;
}
PAM_EXTERN
int pam_sm_open_session(pam_handle_t *pamh,int flags,int argc
,const char **argv)
{
int retval, ctrl;
char *conf_file=NULL;
/*
* this module sets environment variables read in from a file
*/
D(("Called."));
ctrl = _pam_parse(flags, argc, argv, &conf_file);
retval = _parse_config_file(pamh, ctrl, &conf_file);
/* indicate success or failure */
D(("Exit."));
return retval;
}
PAM_EXTERN
int pam_sm_close_session(pam_handle_t *pamh,int flags,int argc,
const char **argv)
{
D(("Called and Exit"));
return PAM_SUCCESS;
}
PAM_EXTERN
int pam_sm_chauthtok(pam_handle_t *pamh, int flags, int argc,
const char **argv)
{
_log_err(LOG_NOTICE, "pam_sm_chauthtok called inappropriatly");
return PAM_SERVICE_ERR;
}
#ifdef PAM_STATIC
/* static module data */
struct pam_module _pam_env_modstruct = {
"pam_env",
pam_sm_authenticate,
pam_sm_setcred,
pam_sm_acct_mgmt,
pam_sm_open_session,
pam_sm_close_session,
pam_sm_chauthtok,
};
#endif
/* end of module definition */
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