diff options
Diffstat (limited to 'modules/pam_env/pam_env.c')
| -rw-r--r-- | modules/pam_env/pam_env.c | 885 |
1 files changed, 885 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..e04f5b5 --- /dev/null +++ b/modules/pam_env/pam_env.c @@ -0,0 +1,885 @@ +/* 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 1 + +#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> + +/* + * 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_modutil.h> +#include <security/_pam_macros.h> +#include <security/pam_ext.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(const pam_handle_t *, 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 flag used to designate an empty string */ +static char quote='Z'; + +/* 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) { + + /* generic options */ + + if (!strcmp(*argv,"debug")) + ctrl |= PAM_DEBUG_ARG; + else if (!strncmp(*argv,"conffile=",9)) { + if ((*argv)[9] == '\0') { + pam_syslog(pamh, LOG_ERR, + "conffile= specification missing argument - ignored"); + } else { + *conffile = 9+*argv; + D(("new Configuration File: %s", *conffile)); + } + } else if (!strncmp(*argv,"envfile=",8)) { + if ((*argv)[8] == '\0') { + pam_syslog (pamh, LOG_ERR, + "envfile= specification missing argument - ignored"); + } else { + *envfile = 8+*argv; + D(("new Env File: %s", *envfile)); + } + } else if (!strncmp(*argv,"user_envfile=",13)) { + if ((*argv)[13] == '\0') { + pam_syslog (pamh, LOG_ERR, + "user_envfile= specification missing argument - ignored"); + } else { + *user_envfile = 13+*argv; + D(("new User Env File: %s", *user_envfile)); + } + } else if (!strncmp(*argv,"readenv=",8)) + *readenv = atoi(8+*argv); + else if (!strncmp(*argv,"user_readenv=",13)) + *user_readenv = atoi(13+*argv); + 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 alpha-numeric + */ + + 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 + * 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; + 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; + } + } + + /* 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, 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) { + pam_syslog(pamh, 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)); + 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_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 + */ + + /* 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]; + + D(("Remember to initialize tmp!")); + memset(tmp, 0, MAX_ENV); + + /* + * (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 ((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)); + 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 ((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 ${ or @{ characters */ + ptr = strchr(orig, '}'); + if (ptr) { + *ptr++ = '\0'; + } else { + D(("Unterminated expandable variable: <%s>", orig-2)); + pam_syslog(pamh, LOG_ERR, + "Unterminated expandable variable: <%s>", orig-2); + return PAM_ABORT; + } + strncpy(tmpval, orig, sizeof(tmpval)); + tmpval[sizeof(tmpval)-1] = '\0'; + orig=ptr; + /* + * so, we know we need to expand tmpval, it is either + * an environment variable or a PAM_ITEM. type will tell us which + */ + switch (type) { + + case '$': + 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) { + 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)); + pam_syslog (pamh, LOG_ERR, + "Variable buffer overflow: <%s> + <%s>", tmp, tmpptr); + return PAM_BUF_ERR; + } + } + } /* 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)); + pam_syslog(pamh, LOG_ERR, + "Variable buffer overflow: <%s> + <%s>", tmp, tmpptr); + return PAM_BUF_ERR; + } + } + } /* 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)); + pam_syslog (pamh, LOG_ERR, "Couldn't malloc %lu bytes for expanded var", + (unsigned long)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 void *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)); + 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 */ + } + 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_ERR, "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 && ("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 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_ERR, "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; +} + +PAM_EXTERN 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; +} + +PAM_EXTERN int +pam_sm_setcred (pam_handle_t *pamh, int flags UNUSED, + int argc, const char **argv) +{ + D(("Called")); + return handle_env (pamh, argc, argv); +} + +PAM_EXTERN 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); +} + +PAM_EXTERN 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; +} + +PAM_EXTERN 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; +} + +#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 */ |