diff options
Diffstat (limited to 'contrib/libpam/modules/pam_env/pam_env.c')
| -rw-r--r-- | contrib/libpam/modules/pam_env/pam_env.c | 779 |
1 files changed, 0 insertions, 779 deletions
diff --git a/contrib/libpam/modules/pam_env/pam_env.c b/contrib/libpam/modules/pam_env/pam_env.c deleted file mode 100644 index bd0879c..0000000 --- a/contrib/libpam/modules/pam_env/pam_env.c +++ /dev/null @@ -1,779 +0,0 @@ -/* 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 */ |
