/* * CDDL HEADER START * * The contents of this file are subject to the terms of the * Common Development and Distribution License (the "License"). * You may not use this file except in compliance with the License. * * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE * or http://www.opensolaris.org/os/licensing. * See the License for the specific language governing permissions * and limitations under the License. * * When distributing Covered Code, include this CDDL HEADER in each * file and include the License file at usr/src/OPENSOLARIS.LICENSE. * If applicable, add the following below this CDDL HEADER, with the * fields enclosed by brackets "[]" replaced with your own identifying * information: Portions Copyright [yyyy] [name of copyright owner] * * CDDL HEADER END */ /* * Copyright 2009 Sun Microsystems, Inc. All rights reserved. * Use is subject to license terms. */ /* * Copyright 2020, Joyent, Inc. */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "pam_impl.h" static char *pam_snames [PAM_NUM_MODULE_TYPES] = { PAM_ACCOUNT_NAME, PAM_AUTH_NAME, PAM_PASSWORD_NAME, PAM_SESSION_NAME }; static char *pam_inames [PAM_MAX_ITEMS] = { /* NONE */ NULL, /* PAM_SERVICE */ "service", /* PAM_USER */ "user", /* PAM_TTY */ "tty", /* PAM_RHOST */ "rhost", /* PAM_CONV */ "conv", /* PAM_AUTHTOK */ "authtok", /* PAM_OLDAUTHTOK */ "oldauthtok", /* PAM_RUSER */ "ruser", /* PAM_USER_PROMPT */ "user_prompt", /* PAM_REPOSITORY */ "repository", /* PAM_RESOURCE */ "resource", /* PAM_AUSER */ "auser", /* Undefined Items */ }; /* * This extra definition is needed in order to build this library * on pre-64-bit-aware systems. */ #if !defined(_LFS64_LARGEFILE) #define stat64 stat #endif /* !defined(_LFS64_LARGEFILE) */ /* functions to dynamically load modules */ static int load_modules(pam_handle_t *, int, char *, pamtab_t *); static void *open_module(pam_handle_t *, char *); static int load_function(void *, char *, int (**func)()); /* functions to read and store the pam.conf configuration file */ static int open_pam_conf(struct pam_fh **, pam_handle_t *, char *); static void close_pam_conf(struct pam_fh *); static int read_pam_conf(pam_handle_t *, char *); static int get_pam_conf_entry(struct pam_fh *, pam_handle_t *, pamtab_t **); static char *read_next_token(char **); static char *nextline(struct pam_fh *, pam_handle_t *, int *); static int verify_pam_conf(pamtab_t *, char *); /* functions to clean up and free memory */ static void clean_up(pam_handle_t *); static void free_pamconf(pamtab_t *); static void free_pam_conf_info(pam_handle_t *); static void free_env(env_list *); /* convenience functions for I18N/L10N communication */ static void free_resp(int, struct pam_response *); static int do_conv(pam_handle_t *, int, int, char messages[][PAM_MAX_MSG_SIZE], void *, struct pam_response **); static int log_priority; /* pam_trace syslog priority & facility */ static int pam_debug = 0; static char * pam_trace_iname(int item_type, char *iname_buf) { char *name; if (item_type <= 0 || item_type >= PAM_MAX_ITEMS || (name = pam_inames[item_type]) == NULL) { (void) sprintf(iname_buf, "%d", item_type); return (iname_buf); } return (name); } static char * pam_trace_fname(int flag) { if (flag & PAM_BINDING) return (PAM_BINDING_NAME); if (flag & PAM_INCLUDE) return (PAM_INCLUDE_NAME); if (flag & PAM_OPTIONAL) return (PAM_OPTIONAL_NAME); if (flag & PAM_REQUIRED) return (PAM_REQUIRED_NAME); if (flag & PAM_REQUISITE) return (PAM_REQUISITE_NAME); if (flag & PAM_SUFFICIENT) return (PAM_SUFFICIENT_NAME); return ("bad flag name"); } static char * pam_trace_cname(pam_handle_t *pamh) { if (pamh->pam_conf_name[pamh->include_depth] == NULL) return ("NULL"); return (pamh->pam_conf_name[pamh->include_depth]); } #include #include /* * pam_settrace - setup configuration for pam tracing * * turn on PAM debug if "magic" file exists * if exists (original), pam_debug = PAM_DEBUG_DEFAULT, * log_priority = LOG_DEBUG(7) and log_facility = LOG_AUTH(4). * * if has contents, keywork=value pairs: * * "log_priority=" 0-7, the pam_trace syslog priority to use * (see sys/syslog.h) * "log_facility=" 0-23, the pam_trace syslog facility to use * (see sys/syslog.h) * "debug_flags=" PAM_DEBUG_DEFAULT (0x0001), log traditional * (original) debugging. * Plus the logical or of: * PAM_DEBUG_ITEM (0x0002), log item values and * pam_get_item. * PAM_DEBUG_MODULE (0x0004), log module return status. * PAM_DEBUG_CONF (0x0008), log pam.conf parsing. * PAM_DEBUG_DATA (0x0010), get/set_data. * PAM_DEBUG_CONV (0x0020), conversation/response. * * If compiled with DEBUG: * PAM_DEBUG_AUTHTOK (0x8000), display AUTHTOK value if * PAM_DEBUG_ITEM is set and results from * PAM_PROMPT_ECHO_OFF responses. * USE CAREFULLY, THIS EXPOSES THE USER'S PASSWORDS. * * or set to 0 and off even if PAM_DEBUG file exists. * * Output has the general form: * PAM[]: ( and other info) * PAM[]: details requested for call * Where: is the process ID of the calling process. * is the Hex value of the pam_handle associated with the * call. */ static void pam_settrace() { void *defp; if ((defp = defopen_r(PAM_DEBUG)) != NULL) { char *arg; int code; int facility = LOG_AUTH; pam_debug = PAM_DEBUG_DEFAULT; log_priority = LOG_DEBUG; (void) defcntl_r(DC_SETFLAGS, DC_CASE, defp); if ((arg = defread_r(LOG_PRIORITY, defp)) != NULL) { code = (int)strtol(arg, NULL, 10); if ((code & ~LOG_PRIMASK) == 0) { log_priority = code; } } if ((arg = defread_r(LOG_FACILITY, defp)) != NULL) { code = (int)strtol(arg, NULL, 10); if (code < LOG_NFACILITIES) { facility = code << 3; } } if ((arg = defread_r(DEBUG_FLAGS, defp)) != NULL) { pam_debug = (int)strtol(arg, NULL, 0); } defclose_r(defp); log_priority |= facility; } } /* * pam_trace - logs tracing messages * * flag = debug_flags from /etc/pam_debug * format and args = message to print (PAM[]: is prepended). * * global log_priority = pam_trace syslog (log_priority | log_facility) * from /etc/pam_debug */ /*PRINTFLIKE2*/ static void pam_trace(int flag, char *format, ...) { va_list args; char message[1024]; int savemask; if ((pam_debug & flag) == 0) return; savemask = setlogmask(LOG_MASK(log_priority & LOG_PRIMASK)); (void) snprintf(message, sizeof (message), "PAM[%ld]: %s", (long)getpid(), format); va_start(args, format); (void) vsyslog(log_priority, message, args); va_end(args); (void) setlogmask(savemask); } /* * __pam_log - logs PAM syslog messages * * priority = message priority * format and args = message to log */ /*PRINTFLIKE2*/ void __pam_log(int priority, const char *format, ...) { va_list args; int savemask = setlogmask(LOG_MASK(priority & LOG_PRIMASK)); va_start(args, format); (void) vsyslog(priority, format, args); va_end(args); (void) setlogmask(savemask); } /* * pam_XXXXX routines * * These are the entry points to the authentication switch */ /* * pam_start - initiate an authentication transaction and * set parameter values to be used during the * transaction */ int pam_start(const char *service, const char *user, const struct pam_conv *pam_conv, pam_handle_t **pamh) { int err; *pamh = calloc(1, sizeof (struct pam_handle)); pam_settrace(); pam_trace(PAM_DEBUG_DEFAULT, "pam_start(%s,%s,%p:%p) - debug = %x", service ? service : "NULL", user ? user : "NULL", (void *)pam_conv, (void *)*pamh, pam_debug); if (*pamh == NULL) return (PAM_BUF_ERR); (*pamh)->pam_inmodule = RO_OK; /* OK to set RO items */ if ((err = pam_set_item(*pamh, PAM_SERVICE, (void *)service)) != PAM_SUCCESS) { clean_up(*pamh); *pamh = NULL; return (err); } if ((err = pam_set_item(*pamh, PAM_USER, (void *)user)) != PAM_SUCCESS) { clean_up(*pamh); *pamh = NULL; return (err); } if ((err = pam_set_item(*pamh, PAM_CONV, (void *)pam_conv)) != PAM_SUCCESS) { clean_up(*pamh); *pamh = NULL; return (err); } (*pamh)->pam_inmodule = RW_OK; return (PAM_SUCCESS); } /* * pam_end - terminate an authentication transaction */ int pam_end(pam_handle_t *pamh, int pam_status) { struct pam_module_data *psd, *p; fd_list *expired; fd_list *traverse; env_list *env_expired; env_list *env_traverse; pam_trace(PAM_DEBUG_DEFAULT, "pam_end(%p): status = %s", (void *)pamh, pam_strerror(pamh, pam_status)); if (pamh == NULL) return (PAM_SYSTEM_ERR); /* call the cleanup routines for module specific data */ psd = pamh->ssd; while (psd) { if (psd->cleanup) { psd->cleanup(pamh, psd->data, pam_status); } p = psd; psd = p->next; free(p->module_data_name); free(p); } pamh->ssd = NULL; /* dlclose all module fds */ traverse = pamh->fd; while (traverse) { expired = traverse; traverse = traverse->next; (void) dlclose(expired->mh); free(expired); } pamh->fd = 0; /* remove all environment variables */ env_traverse = pamh->pam_env; while (env_traverse) { env_expired = env_traverse; env_traverse = env_traverse->next; free_env(env_expired); } clean_up(pamh); return (PAM_SUCCESS); } /* * pam_set_item - set the value of a parameter that can be * retrieved via a call to pam_get_item() */ int pam_set_item(pam_handle_t *pamh, int item_type, const void *item) { struct pam_item *pip; int size; char iname_buf[PAM_MAX_MSG_SIZE]; if (((pam_debug & PAM_DEBUG_ITEM) == 0) || (pamh == NULL)) { pam_trace(PAM_DEBUG_DEFAULT, "pam_set_item(%p:%s)", (void *)pamh, pam_trace_iname(item_type, iname_buf)); } if (pamh == NULL) return (PAM_SYSTEM_ERR); /* check read only items */ if ((item_type == PAM_SERVICE) && (pamh->pam_inmodule != RO_OK)) return (PAM_PERM_DENIED); /* * Check that item_type is within valid range */ if (item_type <= 0 || item_type >= PAM_MAX_ITEMS) return (PAM_SYMBOL_ERR); pip = &(pamh->ps_item[item_type]); switch (item_type) { case PAM_AUTHTOK: case PAM_OLDAUTHTOK: if (pip->pi_addr != NULL) (void) memset(pip->pi_addr, 0, pip->pi_size); /*FALLTHROUGH*/ case PAM_SERVICE: case PAM_USER: case PAM_TTY: case PAM_RHOST: case PAM_RUSER: case PAM_USER_PROMPT: case PAM_RESOURCE: case PAM_AUSER: if (pip->pi_addr != NULL) { free(pip->pi_addr); } if (item == NULL) { pip->pi_addr = NULL; pip->pi_size = 0; } else { pip->pi_addr = strdup((char *)item); if (pip->pi_addr == NULL) { pip->pi_size = 0; return (PAM_BUF_ERR); } pip->pi_size = strlen(pip->pi_addr); } break; case PAM_CONV: if (pip->pi_addr != NULL) free(pip->pi_addr); size = sizeof (struct pam_conv); if ((pip->pi_addr = calloc(1, size)) == NULL) return (PAM_BUF_ERR); if (item != NULL) (void) memcpy(pip->pi_addr, item, (unsigned int) size); else (void) memset(pip->pi_addr, 0, size); pip->pi_size = size; break; case PAM_REPOSITORY: if (pip->pi_addr != NULL) { pam_repository_t *auth_rep; auth_rep = (pam_repository_t *)pip->pi_addr; if (auth_rep->type != NULL) free(auth_rep->type); if (auth_rep->scope != NULL) free(auth_rep->scope); free(auth_rep); } if (item != NULL) { pam_repository_t *s, *d; size = sizeof (struct pam_repository); pip->pi_addr = calloc(1, size); if (pip->pi_addr == NULL) return (PAM_BUF_ERR); s = (struct pam_repository *)item; d = (struct pam_repository *)pip->pi_addr; d->type = strdup(s->type); if (d->type == NULL) return (PAM_BUF_ERR); d->scope = malloc(s->scope_len); if (d->scope == NULL) return (PAM_BUF_ERR); (void) memcpy(d->scope, s->scope, s->scope_len); d->scope_len = s->scope_len; } pip->pi_size = size; break; default: return (PAM_SYMBOL_ERR); } switch (item_type) { case PAM_CONV: pam_trace(PAM_DEBUG_ITEM, "pam_set_item(%p:%s)=%p", (void *)pamh, pam_trace_iname(item_type, iname_buf), item ? (void *)((struct pam_conv *)item)->conv : (void *)0); break; case PAM_REPOSITORY: pam_trace(PAM_DEBUG_ITEM, "pam_set_item(%p:%s)=%s", (void *)pamh, pam_trace_iname(item_type, iname_buf), item ? (((struct pam_repository *)item)->type ? ((struct pam_repository *)item)->type : "NULL") : "NULL"); break; case PAM_AUTHTOK: case PAM_OLDAUTHTOK: #ifdef DEBUG if (pam_debug & PAM_DEBUG_AUTHTOK) pam_trace(PAM_DEBUG_ITEM, "pam_set_item(%p:%s)=%s", (void *)pamh, pam_trace_iname(item_type, iname_buf), item ? (char *)item : "NULL"); else #endif /* DEBUG */ pam_trace(PAM_DEBUG_ITEM, "pam_set_item(%p:%s)=%s", (void *)pamh, pam_trace_iname(item_type, iname_buf), item ? "********" : "NULL"); break; default: pam_trace(PAM_DEBUG_ITEM, "pam_set_item(%p:%s)=%s", (void *)pamh, pam_trace_iname(item_type, iname_buf), item ? (char *)item : "NULL"); } return (PAM_SUCCESS); } /* * pam_get_item - read the value of a parameter specified in * the call to pam_set_item() */ int pam_get_item(const pam_handle_t *pamh, int item_type, void **item) { struct pam_item *pip; char iname_buf[PAM_MAX_MSG_SIZE]; if (((pam_debug & PAM_DEBUG_ITEM) == 0) || (pamh == NULL)) { pam_trace(PAM_DEBUG_ITEM, "pam_get_item(%p:%s)", (void *)pamh, pam_trace_iname(item_type, iname_buf)); } if (pamh == NULL) return (PAM_SYSTEM_ERR); if (item_type <= 0 || item_type >= PAM_MAX_ITEMS) return (PAM_SYMBOL_ERR); if ((pamh->pam_inmodule != WO_OK) && ((item_type == PAM_AUTHTOK || item_type == PAM_OLDAUTHTOK))) { __pam_log(LOG_AUTH | LOG_NOTICE, "pam_get_item(%s) called from " "a non module context", pam_trace_iname(item_type, iname_buf)); return (PAM_PERM_DENIED); } pip = (struct pam_item *)&(pamh->ps_item[item_type]); *item = pip->pi_addr; switch (item_type) { case PAM_CONV: pam_trace(PAM_DEBUG_ITEM, "pam_get_item(%p:%s)=%p", (void *)pamh, pam_trace_iname(item_type, iname_buf), (void *)((struct pam_conv *)*item)->conv); break; case PAM_REPOSITORY: pam_trace(PAM_DEBUG_ITEM, "pam_get_item(%p:%s)=%s", (void *)pamh, pam_trace_iname(item_type, iname_buf), *item ? (((struct pam_repository *)*item)->type ? ((struct pam_repository *)*item)->type : "NULL") : "NULL"); break; case PAM_AUTHTOK: case PAM_OLDAUTHTOK: #ifdef DEBUG if (pam_debug & PAM_DEBUG_AUTHTOK) pam_trace(PAM_DEBUG_ITEM, "pam_get_item(%p:%s)=%s", (void *)pamh, pam_trace_iname(item_type, iname_buf), *item ? *(char **)item : "NULL"); else #endif /* DEBUG */ pam_trace(PAM_DEBUG_ITEM, "pam_get_item(%p:%s)=%s", (void *)pamh, pam_trace_iname(item_type, iname_buf), *item ? "********" : "NULL"); break; default: pam_trace(PAM_DEBUG_ITEM, "pam_get_item(%p:%s)=%s", (void *)pamh, pam_trace_iname(item_type, iname_buf), *item ? *(char **)item : "NULL"); } return (PAM_SUCCESS); } /* * parse_user_name - process the user response: ignore * '\t' or ' ' before or after a user name. * user_input is a null terminated string. * *ret_username will be the user name. */ static int parse_user_name(char *user_input, char **ret_username) { register char *ptr; register int index = 0; char username[PAM_MAX_RESP_SIZE]; /* Set the default value for *ret_username */ *ret_username = NULL; /* * Set the initial value for username - this is a buffer holds * the user name. */ bzero((void *)username, PAM_MAX_RESP_SIZE); /* * The user_input is guaranteed to be terminated by a null character. */ ptr = user_input; /* Skip all the leading whitespaces if there are any. */ while ((*ptr == ' ') || (*ptr == '\t')) ptr++; if (*ptr == '\0') { /* * We should never get here since the user_input we got * in pam_get_user() is not all whitespaces nor just "\0". */ return (PAM_BUF_ERR); } /* * username will be the first string we get from user_input * - we skip leading whitespaces and ignore trailing whitespaces */ while (*ptr != '\0') { if ((*ptr == ' ') || (*ptr == '\t') || (index >= PAM_MAX_RESP_SIZE)) { break; } else { username[index] = *ptr; index++; ptr++; } } /* ret_username will be freed in pam_get_user(). */ if (index >= PAM_MAX_RESP_SIZE || (*ret_username = strdup(username)) == NULL) return (PAM_BUF_ERR); return (PAM_SUCCESS); } /* * Get the value of PAM_USER. If not set, then use the convenience function * to prompt for the user. Use prompt if specified, else use PAM_USER_PROMPT * if it is set, else use default. */ #define WHITESPACE 0 #define USERNAME 1 int pam_get_user(pam_handle_t *pamh, char **user, const char *prompt_override) { int status; char *prompt = NULL; char *real_username; struct pam_response *ret_resp = NULL; char messages[PAM_MAX_NUM_MSG][PAM_MAX_MSG_SIZE]; pam_trace(PAM_DEBUG_DEFAULT, "pam_get_user(%p, %p, %s)", (void *)pamh, (void *)*user, prompt_override ? prompt_override : "NULL"); if (pamh == NULL) return (PAM_SYSTEM_ERR); if ((status = pam_get_item(pamh, PAM_USER, (void **)user)) != PAM_SUCCESS) { return (status); } /* if the user is set, return it */ if (*user != NULL && *user[0] != '\0') { return (PAM_SUCCESS); } /* * if the module is requesting a special prompt, use it. * else use PAM_USER_PROMPT. */ if (prompt_override != NULL) { prompt = (char *)prompt_override; } else { status = pam_get_item(pamh, PAM_USER_PROMPT, (void**)&prompt); if (status != PAM_SUCCESS) { return (status); } } /* if the prompt is not set, use default */ if (prompt == NULL || prompt[0] == '\0') { prompt = dgettext(TEXT_DOMAIN, "Please enter user name: "); } /* prompt for the user */ (void) strncpy(messages[0], prompt, sizeof (messages[0])); for (;;) { int state = WHITESPACE; status = do_conv(pamh, PAM_PROMPT_ECHO_ON, 1, messages, NULL, &ret_resp); if (status != PAM_SUCCESS) { return (status); } if (ret_resp->resp && ret_resp->resp[0] != '\0') { int len = strlen(ret_resp->resp); int i; for (i = 0; i < len; i++) { if ((ret_resp->resp[i] != ' ') && (ret_resp->resp[i] != '\t')) { state = USERNAME; break; } } if (state == USERNAME) break; } /* essentially empty response, try again */ free_resp(1, ret_resp); ret_resp = NULL; } /* set PAM_USER */ /* Parse the user input to get the user name. */ status = parse_user_name(ret_resp->resp, &real_username); if (status != PAM_SUCCESS) { if (real_username != NULL) free(real_username); free_resp(1, ret_resp); return (status); } status = pam_set_item(pamh, PAM_USER, real_username); free(real_username); free_resp(1, ret_resp); if (status != PAM_SUCCESS) { return (status); } /* * finally, get PAM_USER. We have to call pam_get_item to get * the value of user because pam_set_item mallocs the memory. */ status = pam_get_item(pamh, PAM_USER, (void**)user); return (status); } /* * Set module specific data */ int pam_set_data(pam_handle_t *pamh, const char *module_data_name, void *data, void (*cleanup)(pam_handle_t *pamh, void *data, int pam_end_status)) { struct pam_module_data *psd; pam_trace(PAM_DEBUG_DATA, "pam_set_data(%p:%s:%d)=%p", (void *)pamh, (module_data_name != NULL) ? module_data_name : "NULL", (pamh != NULL) ? pamh->pam_inmodule : -1, data); if (pamh == NULL || (pamh->pam_inmodule != WO_OK) || module_data_name == NULL) { return (PAM_SYSTEM_ERR); } /* check if module data already exists */ for (psd = pamh->ssd; psd; psd = psd->next) { if (strcmp(psd->module_data_name, module_data_name) == 0) { /* clean up original data before setting the new data */ if (psd->cleanup) { psd->cleanup(pamh, psd->data, PAM_SUCCESS); } psd->data = (void *)data; psd->cleanup = cleanup; return (PAM_SUCCESS); } } psd = malloc(sizeof (struct pam_module_data)); if (psd == NULL) return (PAM_BUF_ERR); psd->module_data_name = strdup(module_data_name); if (psd->module_data_name == NULL) { free(psd); return (PAM_BUF_ERR); } psd->data = (void *)data; psd->cleanup = cleanup; psd->next = pamh->ssd; pamh->ssd = psd; return (PAM_SUCCESS); } /* * get module specific data */ int pam_get_data(const pam_handle_t *pamh, const char *module_data_name, const void **data) { struct pam_module_data *psd; if (pamh == NULL || (pamh->pam_inmodule != WO_OK) || module_data_name == NULL) { pam_trace(PAM_DEBUG_DATA, "pam_get_data(%p:%s:%d)=%p", (void *)pamh, module_data_name ? module_data_name : "NULL", pamh->pam_inmodule, *data); return (PAM_SYSTEM_ERR); } for (psd = pamh->ssd; psd; psd = psd->next) { if (strcmp(psd->module_data_name, module_data_name) == 0) { *data = psd->data; pam_trace(PAM_DEBUG_DATA, "pam_get_data(%p:%s)=%p", (void *)pamh, module_data_name, *data); return (PAM_SUCCESS); } } pam_trace(PAM_DEBUG_DATA, "pam_get_data(%p:%s)=%s", (void *)pamh, module_data_name, "PAM_NO_MODULE_DATA"); return (PAM_NO_MODULE_DATA); } /* * PAM equivalent to strerror() */ /* ARGSUSED */ const char * pam_strerror(pam_handle_t *pamh, int errnum) { switch (errnum) { case PAM_SUCCESS: return (dgettext(TEXT_DOMAIN, "Success")); case PAM_OPEN_ERR: return (dgettext(TEXT_DOMAIN, "Dlopen failure")); case PAM_SYMBOL_ERR: return (dgettext(TEXT_DOMAIN, "Symbol not found")); case PAM_SERVICE_ERR: return (dgettext(TEXT_DOMAIN, "Error in underlying service module")); case PAM_SYSTEM_ERR: return (dgettext(TEXT_DOMAIN, "System error")); case PAM_BUF_ERR: return (dgettext(TEXT_DOMAIN, "Memory buffer error")); case PAM_CONV_ERR: return (dgettext(TEXT_DOMAIN, "Conversation failure")); case PAM_PERM_DENIED: return (dgettext(TEXT_DOMAIN, "Permission denied")); case PAM_MAXTRIES: return (dgettext(TEXT_DOMAIN, "Maximum number of attempts exceeded")); case PAM_AUTH_ERR: return (dgettext(TEXT_DOMAIN, "Authentication failed")); case PAM_NEW_AUTHTOK_REQD: return (dgettext(TEXT_DOMAIN, "Get new authentication token")); case PAM_CRED_INSUFFICIENT: return (dgettext(TEXT_DOMAIN, "Insufficient credentials")); case PAM_AUTHINFO_UNAVAIL: return (dgettext(TEXT_DOMAIN, "Can not retrieve authentication info")); case PAM_USER_UNKNOWN: return (dgettext(TEXT_DOMAIN, "No account present for user")); case PAM_CRED_UNAVAIL: return (dgettext(TEXT_DOMAIN, "Can not retrieve user credentials")); case PAM_CRED_EXPIRED: return (dgettext(TEXT_DOMAIN, "User credentials have expired")); case PAM_CRED_ERR: return (dgettext(TEXT_DOMAIN, "Failure setting user credentials")); case PAM_ACCT_EXPIRED: return (dgettext(TEXT_DOMAIN, "User account has expired")); case PAM_AUTHTOK_EXPIRED: return (dgettext(TEXT_DOMAIN, "User password has expired")); case PAM_SESSION_ERR: return (dgettext(TEXT_DOMAIN, "Can not make/remove entry for session")); case PAM_AUTHTOK_ERR: return (dgettext(TEXT_DOMAIN, "Authentication token manipulation error")); case PAM_AUTHTOK_RECOVERY_ERR: return (dgettext(TEXT_DOMAIN, "Authentication token can not be recovered")); case PAM_AUTHTOK_LOCK_BUSY: return (dgettext(TEXT_DOMAIN, "Authentication token lock busy")); case PAM_AUTHTOK_DISABLE_AGING: return (dgettext(TEXT_DOMAIN, "Authentication token aging disabled")); case PAM_NO_MODULE_DATA: return (dgettext(TEXT_DOMAIN, "Module specific data not found")); case PAM_IGNORE: return (dgettext(TEXT_DOMAIN, "Ignore module")); case PAM_ABORT: return (dgettext(TEXT_DOMAIN, "General PAM failure ")); case PAM_TRY_AGAIN: return (dgettext(TEXT_DOMAIN, "Unable to complete operation. Try again")); default: return (dgettext(TEXT_DOMAIN, "Unknown error")); } } static void * sm_name(int ind) { switch (ind) { case PAM_AUTHENTICATE: return (PAM_SM_AUTHENTICATE); case PAM_SETCRED: return (PAM_SM_SETCRED); case PAM_ACCT_MGMT: return (PAM_SM_ACCT_MGMT); case PAM_OPEN_SESSION: return (PAM_SM_OPEN_SESSION); case PAM_CLOSE_SESSION: return (PAM_SM_CLOSE_SESSION); case PAM_CHAUTHTOK: return (PAM_SM_CHAUTHTOK); } return (NULL); } static int (*func(pamtab_t *modulep, int ind))() { void *funcp; if ((funcp = modulep->function_ptr) == NULL) return (NULL); switch (ind) { case PAM_AUTHENTICATE: return (((struct auth_module *)funcp)->pam_sm_authenticate); case PAM_SETCRED: return (((struct auth_module *)funcp)->pam_sm_setcred); case PAM_ACCT_MGMT: return (((struct account_module *)funcp)->pam_sm_acct_mgmt); case PAM_OPEN_SESSION: return (((struct session_module *)funcp)->pam_sm_open_session); case PAM_CLOSE_SESSION: return (((struct session_module *)funcp)->pam_sm_close_session); case PAM_CHAUTHTOK: return (((struct password_module *)funcp)->pam_sm_chauthtok); } return (NULL); } /* * Run through the PAM service module stack for the given module type. */ static int run_stack(pam_handle_t *pamh, int flags, int type, int def_err, int ind, char *function_name) { int err = PAM_SYSTEM_ERR; /* preset */ int optional_error = 0; int required_error = 0; int success = 0; pamtab_t *modulep; int (*sm_func)(); if (pamh == NULL) return (PAM_SYSTEM_ERR); /* read initial entries from pam.conf */ if ((err = read_pam_conf(pamh, PAM_CONFIG)) != PAM_SUCCESS) { return (err); } if ((modulep = pamh->pam_conf_info[pamh->include_depth][type]) == NULL) { __pam_log(LOG_AUTH | LOG_ERR, "%s no initial module present", pam_trace_cname(pamh)); goto exit_return; } pamh->pam_inmodule = WO_OK; /* OK to get AUTHTOK */ include: pam_trace(PAM_DEBUG_MODULE, "[%d:%s]:run_stack:%s(%p, %x): %s", pamh->include_depth, pam_trace_cname(pamh), function_name, (void *)pamh, flags, modulep ? modulep->module_path : "NULL"); while (modulep != NULL) { if (modulep->pam_flag & PAM_INCLUDE) { /* save the return location */ pamh->pam_conf_modulep[pamh->include_depth] = modulep->next; pam_trace(PAM_DEBUG_MODULE, "setting for include[%d:%p]", pamh->include_depth, (void *)modulep->next); if (pamh->include_depth++ >= PAM_MAX_INCLUDE) { __pam_log(LOG_AUTH | LOG_ERR, "run_stack: includes too deep %d " "found trying to include %s from %s, %d " "allowed", pamh->include_depth, modulep->module_path, pamh->pam_conf_name [PAM_MAX_INCLUDE] == NULL ? "NULL" : pamh->pam_conf_name[PAM_MAX_INCLUDE], PAM_MAX_INCLUDE); goto exit_return; } if ((err = read_pam_conf(pamh, modulep->module_path)) != PAM_SUCCESS) { __pam_log(LOG_AUTH | LOG_ERR, "run_stack[%d:%s]: can't read included " "conf %s", pamh->include_depth, pam_trace_cname(pamh), modulep->module_path); goto exit_return; } if ((modulep = pamh->pam_conf_info [pamh->include_depth][type]) == NULL) { __pam_log(LOG_AUTH | LOG_ERR, "run_stack[%d:%s]: no include module " "present %s", pamh->include_depth, pam_trace_cname(pamh), function_name); goto exit_return; } if (modulep->pam_flag & PAM_INCLUDE) { /* first line another include */ goto include; } pam_trace(PAM_DEBUG_DEFAULT, "include[%d:%s]" "(%p, %s)=%s", pamh->include_depth, pam_trace_cname(pamh), (void *)pamh, function_name, modulep->module_path); if ((err = load_modules(pamh, type, sm_name(ind), pamh->pam_conf_info [pamh->include_depth][type])) != PAM_SUCCESS) { pam_trace(PAM_DEBUG_DEFAULT, "[%d:%s]:%s(%p, %x): load_modules failed", pamh->include_depth, pam_trace_cname(pamh), function_name, (void *)pamh, flags); goto exit_return; } if ((modulep = pamh->pam_conf_info [pamh->include_depth][type]) == NULL) { __pam_log(LOG_AUTH | LOG_ERR, "%s no initial module present", pam_trace_cname(pamh)); goto exit_return; } } else if ((err = load_modules(pamh, type, sm_name(ind), modulep)) != PAM_SUCCESS) { pam_trace(PAM_DEBUG_DEFAULT, "[%d:%s]:%s(%p, %x): load_modules failed", pamh->include_depth, pam_trace_cname(pamh), function_name, (void *)pamh, flags); goto exit_return; } /* PAM_INCLUDE */ sm_func = func(modulep, ind); if (sm_func) { err = sm_func(pamh, flags, modulep->module_argc, (const char **)modulep->module_argv); pam_trace(PAM_DEBUG_MODULE, "[%d:%s]:%s(%p, %x): %s returned %s", pamh->include_depth, pam_trace_cname(pamh), function_name, (void *)pamh, flags, modulep->module_path, pam_strerror(pamh, err)); switch (err) { case PAM_IGNORE: /* do nothing */ break; case PAM_SUCCESS: if ((modulep->pam_flag & PAM_SUFFI_BIND) && !required_error) { pamh->pam_inmodule = RW_OK; pam_trace(PAM_DEBUG_MODULE, "[%d:%s]:%s(%p, %x): %s: success", pamh->include_depth, pam_trace_cname(pamh), function_name, (void *)pamh, flags, (modulep->pam_flag & PAM_BINDING) ? PAM_BINDING_NAME : PAM_SUFFICIENT_NAME); goto exit_return; } success = 1; break; case PAM_TRY_AGAIN: /* * We need to return immediately, and * we shouldn't reset the AUTHTOK item * since it is not an error per-se. */ pamh->pam_inmodule = RW_OK; pam_trace(PAM_DEBUG_MODULE, "[%d:%s]:%s(%p, %x): TRY_AGAIN: %s", pamh->include_depth, pam_trace_cname(pamh), function_name, (void *)pamh, flags, pam_strerror(pamh, required_error ? required_error : err)); err = required_error ? required_error : err; goto exit_return; default: if (modulep->pam_flag & PAM_REQUISITE) { pamh->pam_inmodule = RW_OK; pam_trace(PAM_DEBUG_MODULE, "[%d:%s]:%s(%p, %x): requisite: %s", pamh->include_depth, pam_trace_cname(pamh), function_name, (void *)pamh, flags, pam_strerror(pamh, required_error ? required_error : err)); err = required_error ? required_error : err; goto exit_return; } else if (modulep->pam_flag & PAM_REQRD_BIND) { if (!required_error) required_error = err; } else { if (!optional_error) optional_error = err; } pam_trace(PAM_DEBUG_DEFAULT, "[%d:%s]:%s(%p, %x): error %s", pamh->include_depth, pam_trace_cname(pamh), function_name, (void *)pamh, flags, pam_strerror(pamh, err)); break; } } modulep = modulep->next; } pam_trace(PAM_DEBUG_MODULE, "[%d:%s]:stack_end:%s(%p, %x): %s %s: %s", pamh->include_depth, pam_trace_cname(pamh), function_name, (void *)pamh, flags, pamh->include_depth ? "included" : "final", required_error ? "required" : success ? "success" : optional_error ? "optional" : "default", pam_strerror(pamh, required_error ? required_error : success ? PAM_SUCCESS : optional_error ? optional_error : def_err)); if (pamh->include_depth > 0) { free_pam_conf_info(pamh); pamh->include_depth--; /* continue at next entry */ modulep = pamh->pam_conf_modulep[pamh->include_depth]; pam_trace(PAM_DEBUG_MODULE, "looping for include[%d:%p]", pamh->include_depth, (void *)modulep); goto include; } free_pam_conf_info(pamh); pamh->pam_inmodule = RW_OK; if (required_error != 0) return (required_error); else if (success != 0) return (PAM_SUCCESS); else if (optional_error != 0) return (optional_error); else return (def_err); exit_return: /* * All done at whatever depth we're at. * Go back to not having read /etc/pam.conf */ while (pamh->include_depth > 0) { free_pam_conf_info(pamh); pamh->include_depth--; } free_pam_conf_info(pamh); pamh->pam_inmodule = RW_OK; return (err); } /* * pam_authenticate - authenticate a user */ int pam_authenticate(pam_handle_t *pamh, int flags) { int retval; retval = run_stack(pamh, flags, PAM_AUTH_MODULE, PAM_AUTH_ERR, PAM_AUTHENTICATE, "pam_authenticate"); if (retval != PAM_SUCCESS) (void) pam_set_item(pamh, PAM_AUTHTOK, NULL); return (retval); } /* * pam_setcred - modify or retrieve user credentials */ int pam_setcred(pam_handle_t *pamh, int flags) { int retval; retval = run_stack(pamh, flags, PAM_AUTH_MODULE, PAM_CRED_ERR, PAM_SETCRED, "pam_setcred"); if (retval != PAM_SUCCESS) (void) pam_set_item(pamh, PAM_AUTHTOK, NULL); return (retval); } /* * pam_acct_mgmt - check password aging, account expiration */ int pam_acct_mgmt(pam_handle_t *pamh, int flags) { int retval; retval = run_stack(pamh, flags, PAM_ACCOUNT_MODULE, PAM_ACCT_EXPIRED, PAM_ACCT_MGMT, "pam_acct_mgmt"); if (retval != PAM_SUCCESS && retval != PAM_NEW_AUTHTOK_REQD) { (void) pam_set_item(pamh, PAM_AUTHTOK, NULL); } return (retval); } /* * pam_open_session - begin session management */ int pam_open_session(pam_handle_t *pamh, int flags) { int retval; retval = run_stack(pamh, flags, PAM_SESSION_MODULE, PAM_SESSION_ERR, PAM_OPEN_SESSION, "pam_open_session"); if (retval != PAM_SUCCESS) (void) pam_set_item(pamh, PAM_AUTHTOK, NULL); return (retval); } /* * pam_close_session - terminate session management */ int pam_close_session(pam_handle_t *pamh, int flags) { int retval; retval = run_stack(pamh, flags, PAM_SESSION_MODULE, PAM_SESSION_ERR, PAM_CLOSE_SESSION, "pam_close_session"); if (retval != PAM_SUCCESS) (void) pam_set_item(pamh, PAM_AUTHTOK, NULL); return (retval); } /* * pam_chauthtok - change user authentication token */ int pam_chauthtok(pam_handle_t *pamh, int flags) { int retval; /* do not let apps use PAM_PRELIM_CHECK or PAM_UPDATE_AUTHTOK */ if (flags & (PAM_PRELIM_CHECK | PAM_UPDATE_AUTHTOK)) { pam_trace(PAM_DEBUG_DEFAULT, "pam_chauthtok(%p, %x): %s", (void *)pamh, flags, pam_strerror(pamh, PAM_SYMBOL_ERR)); return (PAM_SYMBOL_ERR); } /* 1st pass: PRELIM CHECK */ retval = run_stack(pamh, flags | PAM_PRELIM_CHECK, PAM_PASSWORD_MODULE, PAM_AUTHTOK_ERR, PAM_CHAUTHTOK, "pam_chauthtok-prelim"); if (retval == PAM_TRY_AGAIN) return (retval); if (retval != PAM_SUCCESS) { (void) pam_set_item(pamh, PAM_AUTHTOK, NULL); return (retval); } /* 2nd pass: UPDATE AUTHTOK */ retval = run_stack(pamh, flags | PAM_UPDATE_AUTHTOK, PAM_PASSWORD_MODULE, PAM_AUTHTOK_ERR, PAM_CHAUTHTOK, "pam_chauthtok-update"); if (retval != PAM_SUCCESS) (void) pam_set_item(pamh, PAM_AUTHTOK, NULL); return (retval); } /* * pam_putenv - add an environment variable to the PAM handle * if name_value == 'NAME=VALUE' then set variable to the value * if name_value == 'NAME=' then set variable to an empty value * if name_value == 'NAME' then delete the variable */ int pam_putenv(pam_handle_t *pamh, const char *name_value) { int error = PAM_SYSTEM_ERR; char *equal_sign = 0; char *name = NULL, *value = NULL, *tmp_value = NULL; env_list *traverse, *trail; pam_trace(PAM_DEBUG_DEFAULT, "pam_putenv(%p, %s)", (void *)pamh, name_value ? name_value : "NULL"); if (pamh == NULL || name_value == NULL) goto out; /* see if we were passed 'NAME=VALUE', 'NAME=', or 'NAME' */ if ((equal_sign = strchr(name_value, '=')) != 0) { if ((name = calloc(equal_sign - name_value + 1, sizeof (char))) == 0) { error = PAM_BUF_ERR; goto out; } (void) strncpy(name, name_value, equal_sign - name_value); if ((value = strdup(++equal_sign)) == 0) { error = PAM_BUF_ERR; goto out; } } else { if ((name = strdup(name_value)) == 0) { error = PAM_BUF_ERR; goto out; } } /* check to see if we already have this variable in the PAM handle */ traverse = pamh->pam_env; trail = traverse; while (traverse && strncmp(traverse->name, name, strlen(name))) { trail = traverse; traverse = traverse->next; } if (traverse) { /* found a match */ if (value == 0) { /* remove the env variable */ if (pamh->pam_env == traverse) pamh->pam_env = traverse->next; else trail->next = traverse->next; free_env(traverse); } else if (strlen(value) == 0) { /* set env variable to empty value */ if ((tmp_value = strdup("")) == 0) { error = PAM_SYSTEM_ERR; goto out; } free(traverse->value); traverse->value = tmp_value; } else { /* set the new value */ if ((tmp_value = strdup(value)) == 0) { error = PAM_SYSTEM_ERR; goto out; } free(traverse->value); traverse->value = tmp_value; } } else if (traverse == 0 && value) { /* * could not find a match in the PAM handle. * add the new value if there is one */ if ((traverse = calloc(1, sizeof (env_list))) == 0) { error = PAM_BUF_ERR; goto out; } if ((traverse->name = strdup(name)) == 0) { free_env(traverse); error = PAM_BUF_ERR; goto out; } if ((traverse->value = strdup(value)) == 0) { free_env(traverse); error = PAM_BUF_ERR; goto out; } if (trail == 0) { /* new head of list */ pamh->pam_env = traverse; } else { /* adding to end of list */ trail->next = traverse; } } error = PAM_SUCCESS; out: if (error != PAM_SUCCESS) { if (traverse) { if (traverse->name) free(traverse->name); if (traverse->value) free(traverse->value); free(traverse); } } if (name) free(name); if (value) free(value); return (error); } /* * pam_getenv - retrieve an environment variable from the PAM handle */ char * pam_getenv(pam_handle_t *pamh, const char *name) { int error = PAM_SYSTEM_ERR; env_list *traverse; pam_trace(PAM_DEBUG_DEFAULT, "pam_getenv(%p, %p)", (void *)pamh, (void *)name); if (pamh == NULL || name == NULL) goto out; /* check to see if we already have this variable in the PAM handle */ traverse = pamh->pam_env; while (traverse && strncmp(traverse->name, name, strlen(name))) { traverse = traverse->next; } error = (traverse ? PAM_SUCCESS : PAM_SYSTEM_ERR); pam_trace(PAM_DEBUG_DEFAULT, "pam_getenv(%p, %s)=%s", (void *)pamh, name, traverse ? traverse->value : "NULL"); out: return (error ? NULL : strdup(traverse->value)); } /* * pam_getenvlist - retrieve all environment variables from the PAM handle * in a NULL terminated array. On error, return NULL. */ char ** pam_getenvlist(pam_handle_t *pamh) { int error = PAM_SYSTEM_ERR; char **list = 0; int length = 0; env_list *traverse; char *tenv; size_t tenv_size; pam_trace(PAM_DEBUG_DEFAULT, "pam_getenvlist(%p)", (void *)pamh); if (pamh == NULL) goto out; /* find out how many environment variables we have */ traverse = pamh->pam_env; while (traverse) { length++; traverse = traverse->next; } /* allocate the array we will return to the caller */ if ((list = calloc(length + 1, sizeof (char *))) == NULL) { error = PAM_BUF_ERR; goto out; } /* add the variables one by one */ length = 0; traverse = pamh->pam_env; while (traverse != NULL) { tenv_size = strlen(traverse->name) + strlen(traverse->value) + 2; /* name=val\0 */ if ((tenv = malloc(tenv_size)) == NULL) { error = PAM_BUF_ERR; goto out; } /*LINTED*/ (void) sprintf(tenv, "%s=%s", traverse->name, traverse->value); list[length++] = tenv; traverse = traverse->next; } list[length] = NULL; error = PAM_SUCCESS; out: if (error != PAM_SUCCESS) { /* free the partially constructed list */ if (list) { length = 0; while (list[length] != NULL) { free(list[length]); length++; } free(list); } } return (error ? NULL : list); } /* * Routines to load a requested module on demand */ /* * load_modules - load the requested module. * if the dlopen or dlsym fail, then * the module is ignored. */ static int load_modules(pam_handle_t *pamh, int type, char *function_name, pamtab_t *pam_entry) { void *mh; struct auth_module *authp; struct account_module *accountp; struct session_module *sessionp; struct password_module *passwdp; int loading_functions = 0; /* are we currently loading functions? */ pam_trace(PAM_DEBUG_MODULE, "load_modules[%d:%s](%p, %s)=%s:%s", pamh->include_depth, pam_trace_cname(pamh), (void *)pamh, function_name, pam_trace_fname(pam_entry->pam_flag), pam_entry->module_path); while (pam_entry != NULL) { pam_trace(PAM_DEBUG_DEFAULT, "while load_modules[%d:%s](%p, %s)=%s", pamh->include_depth, pam_trace_cname(pamh), (void *)pamh, function_name, pam_entry->module_path); if (pam_entry->pam_flag & PAM_INCLUDE) { pam_trace(PAM_DEBUG_DEFAULT, "done load_modules[%d:%s](%p, %s)=%s", pamh->include_depth, pam_trace_cname(pamh), (void *)pamh, function_name, pam_entry->module_path); return (PAM_SUCCESS); } switch (type) { case PAM_AUTH_MODULE: /* if the function has already been loaded, return */ authp = pam_entry->function_ptr; if (!loading_functions && (((strcmp(function_name, PAM_SM_AUTHENTICATE) == 0) && authp && authp->pam_sm_authenticate) || ((strcmp(function_name, PAM_SM_SETCRED) == 0) && authp && authp->pam_sm_setcred))) { return (PAM_SUCCESS); } /* function has not been loaded yet */ loading_functions = 1; if (authp == NULL) { authp = calloc(1, sizeof (struct auth_module)); if (authp == NULL) return (PAM_BUF_ERR); } /* if open_module fails, return error */ if ((mh = open_module(pamh, pam_entry->module_path)) == NULL) { __pam_log(LOG_AUTH | LOG_ERR, "load_modules[%d:%s]: can not open module " "%s", pamh->include_depth, pam_trace_cname(pamh), pam_entry->module_path); free(authp); return (PAM_OPEN_ERR); } /* load the authentication function */ if (strcmp(function_name, PAM_SM_AUTHENTICATE) == 0) { if (load_function(mh, PAM_SM_AUTHENTICATE, &authp->pam_sm_authenticate) != PAM_SUCCESS) { /* return error if dlsym fails */ free(authp); return (PAM_SYMBOL_ERR); } /* load the setcred function */ } else if (strcmp(function_name, PAM_SM_SETCRED) == 0) { if (load_function(mh, PAM_SM_SETCRED, &authp->pam_sm_setcred) != PAM_SUCCESS) { /* return error if dlsym fails */ free(authp); return (PAM_SYMBOL_ERR); } } pam_entry->function_ptr = authp; break; case PAM_ACCOUNT_MODULE: accountp = pam_entry->function_ptr; if (!loading_functions && (strcmp(function_name, PAM_SM_ACCT_MGMT) == 0) && accountp && accountp->pam_sm_acct_mgmt) { return (PAM_SUCCESS); } /* * If functions are added to the account module, * verify that one of the other functions hasn't * already loaded it. See PAM_AUTH_MODULE code. */ loading_functions = 1; accountp = calloc(1, sizeof (struct account_module)); if (accountp == NULL) return (PAM_BUF_ERR); /* if open_module fails, return error */ if ((mh = open_module(pamh, pam_entry->module_path)) == NULL) { __pam_log(LOG_AUTH | LOG_ERR, "load_modules[%d:%s]: can not open module " "%s", pamh->include_depth, pam_trace_cname(pamh), pam_entry->module_path); free(accountp); return (PAM_OPEN_ERR); } if (load_function(mh, PAM_SM_ACCT_MGMT, &accountp->pam_sm_acct_mgmt) != PAM_SUCCESS) { __pam_log(LOG_AUTH | LOG_ERR, "load_modules[%d:%s]: pam_sm_acct_mgmt() " "missing", pamh->include_depth, pam_trace_cname(pamh)); free(accountp); return (PAM_SYMBOL_ERR); } pam_entry->function_ptr = accountp; break; case PAM_SESSION_MODULE: sessionp = pam_entry->function_ptr; if (!loading_functions && (((strcmp(function_name, PAM_SM_OPEN_SESSION) == 0) && sessionp && sessionp->pam_sm_open_session) || ((strcmp(function_name, PAM_SM_CLOSE_SESSION) == 0) && sessionp && sessionp->pam_sm_close_session))) { return (PAM_SUCCESS); } loading_functions = 1; if (sessionp == NULL) { sessionp = calloc(1, sizeof (struct session_module)); if (sessionp == NULL) return (PAM_BUF_ERR); } /* if open_module fails, return error */ if ((mh = open_module(pamh, pam_entry->module_path)) == NULL) { __pam_log(LOG_AUTH | LOG_ERR, "load_modules[%d:%s]: can not open module " "%s", pamh->include_depth, pam_trace_cname(pamh), pam_entry->module_path); free(sessionp); return (PAM_OPEN_ERR); } if ((strcmp(function_name, PAM_SM_OPEN_SESSION) == 0) && load_function(mh, PAM_SM_OPEN_SESSION, &sessionp->pam_sm_open_session) != PAM_SUCCESS) { free(sessionp); return (PAM_SYMBOL_ERR); } else if ((strcmp(function_name, PAM_SM_CLOSE_SESSION) == 0) && load_function(mh, PAM_SM_CLOSE_SESSION, &sessionp->pam_sm_close_session) != PAM_SUCCESS) { free(sessionp); return (PAM_SYMBOL_ERR); } pam_entry->function_ptr = sessionp; break; case PAM_PASSWORD_MODULE: passwdp = pam_entry->function_ptr; if (!loading_functions && (strcmp(function_name, PAM_SM_CHAUTHTOK) == 0) && passwdp && passwdp->pam_sm_chauthtok) { return (PAM_SUCCESS); } /* * If functions are added to the password module, * verify that one of the other functions hasn't * already loaded it. See PAM_AUTH_MODULE code. */ loading_functions = 1; passwdp = calloc(1, sizeof (struct password_module)); if (passwdp == NULL) return (PAM_BUF_ERR); /* if open_module fails, continue */ if ((mh = open_module(pamh, pam_entry->module_path)) == NULL) { __pam_log(LOG_AUTH | LOG_ERR, "load_modules[%d:%s]: can not open module " "%s", pamh->include_depth, pam_trace_cname(pamh), pam_entry->module_path); free(passwdp); return (PAM_OPEN_ERR); } if (load_function(mh, PAM_SM_CHAUTHTOK, &passwdp->pam_sm_chauthtok) != PAM_SUCCESS) { free(passwdp); return (PAM_SYMBOL_ERR); } pam_entry->function_ptr = passwdp; break; default: pam_trace(PAM_DEBUG_DEFAULT, "load_modules[%d:%s](%p, %s): unsupported type %d", pamh->include_depth, pam_trace_cname(pamh), (void *)pamh, function_name, type); break; } pam_entry = pam_entry->next; } /* while */ pam_trace(PAM_DEBUG_MODULE, "load_modules[%d:%s](%p, %s)=done", pamh->include_depth, pam_trace_cname(pamh), (void *)pamh, function_name); return (PAM_SUCCESS); } /* * open_module - Open the module first checking for * propers modes and ownerships on the file. */ static void * open_module(pam_handle_t *pamh, char *module_so) { struct stat64 stb; char *errmsg; void *lfd; fd_list *module_fds = 0; fd_list *trail = 0; fd_list *traverse = 0; /* Check the ownership and file modes */ if (stat64(module_so, &stb) < 0) { __pam_log(LOG_AUTH | LOG_ERR, "open_module[%d:%s]: stat(%s) failed: %s", pamh->include_depth, pam_trace_cname(pamh), module_so, strerror(errno)); return (NULL); } if (stb.st_uid != (uid_t)0) { __pam_log(LOG_AUTH | LOG_ALERT, "open_module[%d:%s]: Owner of the module %s is not root", pamh->include_depth, pam_trace_cname(pamh), module_so); return (NULL); } if (stb.st_mode & S_IWGRP) { __pam_log(LOG_AUTH | LOG_ALERT, "open_module[%d:%s]: module %s writable by group", pamh->include_depth, pam_trace_cname(pamh), module_so); return (NULL); } if (stb.st_mode & S_IWOTH) { __pam_log(LOG_AUTH | LOG_ALERT, "open_module[%d:%s]: module %s writable by world", pamh->include_depth, pam_trace_cname(pamh), module_so); return (NULL); } /* * Perform the dlopen() */ lfd = (void *)dlopen(module_so, RTLD_LAZY); if (lfd == NULL) { errmsg = dlerror(); __pam_log(LOG_AUTH | LOG_ERR, "open_module[%d:%s]: %s " "failed: %s", pamh->include_depth, pam_trace_cname(pamh), module_so, errmsg != NULL ? errmsg : "Unknown error"); return (NULL); } else { /* add this fd to the pam handle */ if ((module_fds = calloc(1, sizeof (fd_list))) == 0) { (void) dlclose(lfd); lfd = 0; return (NULL); } module_fds->mh = lfd; if (pamh->fd == 0) { /* adding new head of list */ pamh->fd = module_fds; } else { /* appending to end of list */ traverse = pamh->fd; while (traverse) { trail = traverse; traverse = traverse->next; } trail->next = module_fds; } } return (lfd); } /* * load_function - call dlsym() to resolve the function address */ static int load_function(void *lfd, char *name, int (**func)()) { char *errmsg = NULL; if (lfd == NULL) return (PAM_SYMBOL_ERR); *func = (int (*)())dlsym(lfd, name); if (*func == NULL) { errmsg = dlerror(); __pam_log(LOG_AUTH | LOG_ERR, "dlsym failed %s: error %s", name, errmsg != NULL ? errmsg : "Unknown error"); return (PAM_SYMBOL_ERR); } pam_trace(PAM_DEBUG_DEFAULT, "load_function: successful load of %s", name); return (PAM_SUCCESS); } /* * Routines to read the pam.conf configuration file */ /* * open_pam_conf - open the pam.conf config file */ static int open_pam_conf(struct pam_fh **pam_fh, pam_handle_t *pamh, char *config) { struct stat64 stb; int fd; if ((fd = open(config, O_RDONLY)) == -1) { __pam_log(LOG_AUTH | LOG_ALERT, "open_pam_conf[%d:%s]: open(%s) failed: %s", pamh->include_depth, pam_trace_cname(pamh), config, strerror(errno)); return (0); } /* Check the ownership and file modes */ if (fstat64(fd, &stb) < 0) { __pam_log(LOG_AUTH | LOG_ALERT, "open_pam_conf[%d:%s]: stat(%s) failed: %s", pamh->include_depth, pam_trace_cname(pamh), config, strerror(errno)); (void) close(fd); return (0); } if (stb.st_uid != (uid_t)0) { __pam_log(LOG_AUTH | LOG_ALERT, "open_pam_conf[%d:%s]: Owner of %s is not root", pamh->include_depth, pam_trace_cname(pamh), config); (void) close(fd); return (0); } if (stb.st_mode & S_IWGRP) { __pam_log(LOG_AUTH | LOG_ALERT, "open_pam_conf[%d:%s]: %s writable by group", pamh->include_depth, pam_trace_cname(pamh), config); (void) close(fd); return (0); } if (stb.st_mode & S_IWOTH) { __pam_log(LOG_AUTH | LOG_ALERT, "open_pam_conf[%d:%s]: %s writable by world", pamh->include_depth, pam_trace_cname(pamh), config); (void) close(fd); return (0); } if ((*pam_fh = calloc(1, sizeof (struct pam_fh))) == NULL) { (void) close(fd); return (0); } (*pam_fh)->fconfig = fd; (*pam_fh)->bufsize = (size_t)stb.st_size; if (((*pam_fh)->data = mmap(0, (*pam_fh)->bufsize, PROT_READ, MAP_PRIVATE, (*pam_fh)->fconfig, 0)) == MAP_FAILED) { (void) close(fd); free (*pam_fh); return (0); } (*pam_fh)->bufferp = (*pam_fh)->data; return (1); } /* * close_pam_conf - close pam.conf */ static void close_pam_conf(struct pam_fh *pam_fh) { (void) munmap(pam_fh->data, pam_fh->bufsize); (void) close(pam_fh->fconfig); free(pam_fh); } /* * read_pam_conf - read in each entry in pam.conf and store info * under the pam handle. */ static int read_pam_conf(pam_handle_t *pamh, char *config) { struct pam_fh *pam_fh; pamtab_t *pamentp; pamtab_t *tpament; char *service; int error; int i = pamh->include_depth; /* include depth */ /* * service types: * error (-1), "auth" (0), "account" (1), "session" (2), "password" (3) */ int service_found[PAM_NUM_MODULE_TYPES+1] = {0, 0, 0, 0, 0}; (void) pam_get_item(pamh, PAM_SERVICE, (void **)&service); if (service == NULL || *service == '\0') { __pam_log(LOG_AUTH | LOG_ERR, "No service name"); return (PAM_SYSTEM_ERR); } pamh->pam_conf_name[i] = strdup(config); pam_trace(PAM_DEBUG_CONF, "read_pam_conf[%d:%s](%p) open(%s)", i, pam_trace_cname(pamh), (void *)pamh, config); if (open_pam_conf(&pam_fh, pamh, config) == 0) { return (PAM_SYSTEM_ERR); } while ((error = get_pam_conf_entry(pam_fh, pamh, &pamentp)) == PAM_SUCCESS && pamentp) { /* See if entry is this service and valid */ if (verify_pam_conf(pamentp, service)) { pam_trace(PAM_DEBUG_CONF, "read_pam_conf[%d:%s](%p): bad entry error %s", i, pam_trace_cname(pamh), (void *)pamh, service); error = PAM_SYSTEM_ERR; free_pamconf(pamentp); goto out; } if (strcasecmp(pamentp->pam_service, service) == 0) { pam_trace(PAM_DEBUG_CONF, "read_pam_conf[%d:%s](%p): processing %s", i, pam_trace_cname(pamh), (void *)pamh, service); /* process first service entry */ if (service_found[pamentp->pam_type + 1] == 0) { /* purge "other" entries */ while ((tpament = pamh->pam_conf_info[i] [pamentp->pam_type]) != NULL) { pam_trace(PAM_DEBUG_CONF, "read_pam_conf(%p): purging " "\"other\"[%d:%s][%s]", (void *)pamh, i, pam_trace_cname(pamh), pam_snames[pamentp->pam_type]); pamh->pam_conf_info[i] [pamentp->pam_type] = tpament->next; free_pamconf(tpament); } /* add first service entry */ pam_trace(PAM_DEBUG_CONF, "read_pam_conf(%p): adding 1st " "%s[%d:%s][%s]", (void *)pamh, service, i, pam_trace_cname(pamh), pam_snames[pamentp->pam_type]); pamh->pam_conf_info[i][pamentp->pam_type] = pamentp; service_found[pamentp->pam_type + 1] = 1; } else { /* append more service entries */ pam_trace(PAM_DEBUG_CONF, "read_pam_conf(%p): adding more " "%s[%d:%s][%s]", (void *)pamh, service, i, pam_trace_cname(pamh), pam_snames[pamentp->pam_type]); tpament = pamh->pam_conf_info[i][pamentp->pam_type]; while (tpament->next != NULL) { tpament = tpament->next; } tpament->next = pamentp; } } else if (service_found[pamentp->pam_type + 1] == 0) { /* See if "other" entry available and valid */ if (verify_pam_conf(pamentp, "other")) { pam_trace(PAM_DEBUG_CONF, "read_pam_conf(%p): bad entry error %s " "\"other\"[%d:%s]", (void *)pamh, service, i, pam_trace_cname(pamh)); error = PAM_SYSTEM_ERR; free_pamconf(pamentp); goto out; } if (strcasecmp(pamentp->pam_service, "other") == 0) { pam_trace(PAM_DEBUG_CONF, "read_pam_conf(%p): processing " "\"other\"[%d:%s]", (void *)pamh, i, pam_trace_cname(pamh)); if ((tpament = pamh->pam_conf_info[i] [pamentp->pam_type]) == NULL) { /* add first "other" entry */ pam_trace(PAM_DEBUG_CONF, "read_pam_conf(%p): adding 1st " "other[%d:%s][%s]", (void *)pamh, i, pam_trace_cname(pamh), pam_snames[pamentp->pam_type]); pamh->pam_conf_info[i] [pamentp->pam_type] = pamentp; } else { /* append more "other" entries */ pam_trace(PAM_DEBUG_CONF, "read_pam_conf(%p): adding more " "other[%d:%s][%s]", (void *)pamh, i, pam_trace_cname(pamh), pam_snames[pamentp->pam_type]); while (tpament->next != NULL) { tpament = tpament->next; } tpament->next = pamentp; } } else { /* irrelevant entry */ free_pamconf(pamentp); } } else { /* irrelevant entry */ free_pamconf(pamentp); } } out: (void) close_pam_conf(pam_fh); if (error != PAM_SUCCESS) free_pam_conf_info(pamh); return (error); } /* * get_pam_conf_entry - get a pam.conf entry */ static int get_pam_conf_entry(struct pam_fh *pam_fh, pam_handle_t *pamh, pamtab_t **pam) { char *cp, *arg; int argc; char *tmp, *tmp_free; int i; char *current_line = NULL; int error = PAM_SYSTEM_ERR; /* preset to error */ int err; /* get the next line from pam.conf */ if ((cp = nextline(pam_fh, pamh, &err)) == NULL) { /* no more lines in pam.conf ==> return */ error = PAM_SUCCESS; *pam = NULL; goto out; } if ((*pam = calloc(1, sizeof (pamtab_t))) == NULL) { __pam_log(LOG_AUTH | LOG_ERR, "strdup: out of memory"); goto out; } /* copy full line for error reporting */ if ((current_line = strdup(cp)) == NULL) { __pam_log(LOG_AUTH | LOG_ERR, "strdup: out of memory"); goto out; } pam_trace(PAM_DEBUG_CONF, "pam.conf[%s] entry:\t%s", pam_trace_cname(pamh), current_line); /* get service name (e.g. login, su, passwd) */ if ((arg = read_next_token(&cp)) == 0) { __pam_log(LOG_AUTH | LOG_CRIT, "illegal pam.conf[%s] entry: %s: missing SERVICE NAME", pam_trace_cname(pamh), current_line); goto out; } if (((*pam)->pam_service = strdup(arg)) == 0) { __pam_log(LOG_AUTH | LOG_ERR, "strdup: out of memory"); goto out; } /* get module type (e.g. authentication, acct mgmt) */ if ((arg = read_next_token(&cp)) == 0) { __pam_log(LOG_AUTH | LOG_CRIT, "illegal pam.conf[%s] entry: %s: missing MODULE TYPE", pam_trace_cname(pamh), current_line); (*pam)->pam_type = -1; /* 0 is a valid value */ goto getflag; } if (strcasecmp(arg, PAM_AUTH_NAME) == 0) { (*pam)->pam_type = PAM_AUTH_MODULE; } else if (strcasecmp(arg, PAM_ACCOUNT_NAME) == 0) { (*pam)->pam_type = PAM_ACCOUNT_MODULE; } else if (strcasecmp(arg, PAM_SESSION_NAME) == 0) { (*pam)->pam_type = PAM_SESSION_MODULE; } else if (strcasecmp(arg, PAM_PASSWORD_NAME) == 0) { (*pam)->pam_type = PAM_PASSWORD_MODULE; } else { /* error */ __pam_log(LOG_AUTH | LOG_CRIT, "illegal pam.conf[%s] entry: %s: invalid module " "type: %s", pam_trace_cname(pamh), current_line, arg); (*pam)->pam_type = -1; /* 0 is a valid value */ } getflag: /* get pam flag (e.g., requisite, required, sufficient, optional) */ if ((arg = read_next_token(&cp)) == 0) { __pam_log(LOG_AUTH | LOG_CRIT, "illegal pam.conf[%s] entry: %s: missing CONTROL FLAG", pam_trace_cname(pamh), current_line); goto getpath; } if (strcasecmp(arg, PAM_BINDING_NAME) == 0) { (*pam)->pam_flag = PAM_BINDING; } else if (strcasecmp(arg, PAM_INCLUDE_NAME) == 0) { (*pam)->pam_flag = PAM_INCLUDE; } else if (strcasecmp(arg, PAM_OPTIONAL_NAME) == 0) { (*pam)->pam_flag = PAM_OPTIONAL; } else if (strcasecmp(arg, PAM_REQUIRED_NAME) == 0) { (*pam)->pam_flag = PAM_REQUIRED; } else if (strcasecmp(arg, PAM_REQUISITE_NAME) == 0) { (*pam)->pam_flag = PAM_REQUISITE; } else if (strcasecmp(arg, PAM_SUFFICIENT_NAME) == 0) { (*pam)->pam_flag = PAM_SUFFICIENT; } else { /* error */ __pam_log(LOG_AUTH | LOG_CRIT, "illegal pam.conf[%s] entry: %s", pam_trace_cname(pamh), current_line); __pam_log(LOG_AUTH | LOG_CRIT, "\tinvalid control flag: %s", arg); } getpath: /* get module path (e.g. /usr/lib/security/pam_unix_auth.so.1) */ if ((arg = read_next_token(&cp)) == 0) { __pam_log(LOG_AUTH | LOG_CRIT, "illegal pam.conf[%s] entry: %s: missing MODULE PATH", pam_trace_cname(pamh), current_line); error = PAM_SUCCESS; /* success */ goto out; } if (arg[0] != '/') { size_t len; /* * If module path does not start with "/", then * prepend PAM_LIB_DIR (/usr/lib/security/). */ /* sizeof (PAM_LIB_DIR) has room for '\0' */ len = sizeof (PAM_LIB_DIR) + sizeof (PAM_ISA_DIR) + strlen(arg); if (((*pam)->module_path = malloc(len)) == NULL) { __pam_log(LOG_AUTH | LOG_ERR, "strdup: out of memory"); goto out; } if ((*pam)->pam_flag & PAM_INCLUDE) { (void) snprintf((*pam)->module_path, len, "%s%s", PAM_LIB_DIR, arg); } else { (void) snprintf((*pam)->module_path, len, "%s%s%s", PAM_LIB_DIR, PAM_ISA_DIR, arg); } } else { /* Full path provided for module */ char *isa; /* Check for Instruction Set Architecture indicator */ if ((isa = strstr(arg, PAM_ISA)) != NULL) { size_t len; len = strlen(arg) - (sizeof (PAM_ISA)-1) + sizeof (PAM_ISA_DIR); /* substitute the architecture dependent path */ if (((*pam)->module_path = malloc(len)) == NULL) { __pam_log(LOG_AUTH | LOG_ERR, "strdup: out of memory"); goto out; } *isa = '\000'; isa += strlen(PAM_ISA); (void) snprintf((*pam)->module_path, len, "%s%s%s", arg, PAM_ISA_DIR, isa); } else if (((*pam)->module_path = strdup(arg)) == 0) { __pam_log(LOG_AUTH | LOG_ERR, "strdup: out of memory"); goto out; } } /* count the number of module-specific options first */ argc = 0; if ((tmp = strdup(cp)) == NULL) { __pam_log(LOG_AUTH | LOG_ERR, "strdup: out of memory"); goto out; } tmp_free = tmp; for (arg = read_next_token(&tmp); arg; arg = read_next_token(&tmp)) argc++; free(tmp_free); /* allocate array for the module-specific options */ if (argc > 0) { if (((*pam)->module_argv = calloc(argc+1, sizeof (char *))) == 0) { __pam_log(LOG_AUTH | LOG_ERR, "calloc: out of memory"); goto out; } i = 0; for (arg = read_next_token(&cp); arg; arg = read_next_token(&cp)) { (*pam)->module_argv[i] = strdup(arg); if ((*pam)->module_argv[i] == NULL) { __pam_log(LOG_AUTH | LOG_ERR, "strdup failed"); goto out; } i++; } (*pam)->module_argv[argc] = NULL; } (*pam)->module_argc = argc; error = PAM_SUCCESS; /* success */ (*pam)->pam_err = err; /* was the line truncated */ out: if (current_line) free(current_line); if (error != PAM_SUCCESS) { /* on error free this */ if (*pam) free_pamconf(*pam); } return (error); } /* * read_next_token - skip tab and space characters and return the next token */ static char * read_next_token(char **cpp) { register char *cp = *cpp; char *start; if (cp == (char *)0) { *cpp = (char *)0; return ((char *)0); } while (*cp == ' ' || *cp == '\t') cp++; if (*cp == '\0') { *cpp = (char *)0; return ((char *)0); } start = cp; while (*cp && *cp != ' ' && *cp != '\t') cp++; if (*cp != '\0') *cp++ = '\0'; *cpp = cp; return (start); } static char * pam_conf_strnchr(char *sp, int c, intptr_t count) { while (count) { if (*sp == (char)c) return ((char *)sp); else { sp++; count--; } }; return (NULL); } /* * nextline - skip all blank lines and comments */ static char * nextline(struct pam_fh *pam_fh, pam_handle_t *pamh, int *err) { char *ll; int find_a_line = 0; char *data = pam_fh->data; char *bufferp = pam_fh->bufferp; char *bufferendp = &data[pam_fh->bufsize]; size_t input_len; /* * Skip the blank line, comment line */ while (!find_a_line) { /* if we are at the end of the buffer, there is no next line */ if (bufferp == bufferendp) return (NULL); /* skip blank line */ while (*bufferp == '\n') { /* * If we are at the end of the buffer, there is * no next line. */ if (++bufferp == bufferendp) { return (NULL); } /* else we check *bufferp again */ } /* skip comment line */ while (*bufferp == '#') { if ((ll = pam_conf_strnchr(bufferp, '\n', bufferendp - bufferp)) != NULL) { bufferp = ll; } else { /* * this comment line the last line. * no next line */ return (NULL); } /* * If we are at the end of the buffer, there is * no next line. */ if (bufferp == bufferendp) { return (NULL); } } if ((*bufferp != '\n') && (*bufferp != '#')) { find_a_line = 1; } } *err = PAM_SUCCESS; /* now we find one line */ if ((ll = pam_conf_strnchr(bufferp, '\n', bufferendp - bufferp)) != NULL) { if ((input_len = ll - bufferp) >= sizeof (pam_fh->line)) { __pam_log(LOG_AUTH | LOG_ERR, "nextline[%d:%s]: pam.conf line too long %.256s", pamh->include_depth, pam_trace_cname(pamh), bufferp); input_len = sizeof (pam_fh->line) - 1; *err = PAM_SERVICE_ERR; } (void) strncpy(pam_fh->line, bufferp, input_len); pam_fh->line[input_len] = '\0'; pam_fh->bufferp = ll++; } else { ll = bufferendp; if ((input_len = ll - bufferp) >= sizeof (pam_fh->line)) { __pam_log(LOG_AUTH | LOG_ERR, "nextline[%d:%s]: pam.conf line too long %.256s", pamh->include_depth, pam_trace_cname(pamh), bufferp); input_len = sizeof (pam_fh->line) - 1; *err = PAM_SERVICE_ERR; } (void) strncpy(pam_fh->line, bufferp, input_len); pam_fh->line[input_len] = '\0'; pam_fh->bufferp = ll; } return (pam_fh->line); } /* * verify_pam_conf - verify that the pam_conf entry is filled in. * * True = Error if there is no service. * True = Error if there is a service and it matches the requested service * but, the type, flag, line overflow, or path is in error. */ static int verify_pam_conf(pamtab_t *pam, char *service) { return ((pam->pam_service == (char *)NULL) || ((strcasecmp(pam->pam_service, service) == 0) && ((pam->pam_type == -1) || (pam->pam_flag == 0) || (pam->pam_err != PAM_SUCCESS) || (pam->module_path == (char *)NULL)))); } /* * Routines to free allocated storage */ /* * clean_up - free allocated storage in the pam handle */ static void clean_up(pam_handle_t *pamh) { int i; pam_repository_t *auth_rep; if (pamh) { while (pamh->include_depth >= 0) { free_pam_conf_info(pamh); pamh->include_depth--; } /* Cleanup PAM_REPOSITORY structure */ auth_rep = pamh->ps_item[PAM_REPOSITORY].pi_addr; if (auth_rep != NULL) { if (auth_rep->type != NULL) free(auth_rep->type); if (auth_rep->scope != NULL) free(auth_rep->scope); } for (i = 0; i < PAM_MAX_ITEMS; i++) { if (pamh->ps_item[i].pi_addr != NULL) { if (i == PAM_AUTHTOK || i == PAM_OLDAUTHTOK) { (void) memset(pamh->ps_item[i].pi_addr, 0, pamh->ps_item[i].pi_size); } free(pamh->ps_item[i].pi_addr); } } free(pamh); } } /* * free_pamconf - free memory used to store pam.conf entry */ static void free_pamconf(pamtab_t *cp) { int i; if (cp) { if (cp->pam_service) free(cp->pam_service); if (cp->module_path) free(cp->module_path); for (i = 0; i < cp->module_argc; i++) { if (cp->module_argv[i]) free(cp->module_argv[i]); } if (cp->module_argc > 0) free(cp->module_argv); if (cp->function_ptr) free(cp->function_ptr); free(cp); } } /* * free_pam_conf_info - free memory used to store all pam.conf info * under the pam handle */ static void free_pam_conf_info(pam_handle_t *pamh) { pamtab_t *pamentp; pamtab_t *pament_trail; int i = pamh->include_depth; int j; for (j = 0; j < PAM_NUM_MODULE_TYPES; j++) { pamentp = pamh->pam_conf_info[i][j]; pamh->pam_conf_info[i][j] = NULL; pament_trail = pamentp; while (pamentp) { pamentp = pamentp->next; free_pamconf(pament_trail); pament_trail = pamentp; } } if (pamh->pam_conf_name[i] != NULL) { free(pamh->pam_conf_name[i]); pamh->pam_conf_name[i] = NULL; } } static void free_env(env_list *pam_env) { if (pam_env) { if (pam_env->name) free(pam_env->name); if (pam_env->value) free(pam_env->value); free(pam_env); } } /* * Internal convenience functions for Solaris PAM service modules. */ #include #include #include #include #include typedef struct pam_msg_data { nl_catd fd; } pam_msg_data_t; /* * free_resp(): * free storage for responses used in the call back "pam_conv" functions */ void free_resp(int num_msg, struct pam_response *resp) { int i; struct pam_response *r; if (resp) { r = resp; for (i = 0; i < num_msg; i++, r++) { if (r->resp) { /* clear before freeing -- may be a password */ bzero(r->resp, strlen(r->resp)); free(r->resp); r->resp = NULL; } } free(resp); } } static int do_conv(pam_handle_t *pamh, int msg_style, int num_msg, char messages[][PAM_MAX_MSG_SIZE], void *conv_apdp, struct pam_response *ret_respp[]) { struct pam_message *msg; struct pam_message *m; int i; int k; int retcode; struct pam_conv *pam_convp; if ((retcode = pam_get_item(pamh, PAM_CONV, (void **)&pam_convp)) != PAM_SUCCESS) { return (retcode); } /* * When pam_set_item() is called to set PAM_CONV and the * item is NULL, memset(pip->pi_addr, 0, size) is called. * So at this point, we should check whether pam_convp->conv * is NULL or not. */ if ((pam_convp == NULL) || (pam_convp->conv == NULL)) return (PAM_SYSTEM_ERR); i = 0; k = num_msg; msg = calloc(num_msg, sizeof (struct pam_message)); if (msg == NULL) { return (PAM_BUF_ERR); } m = msg; while (k--) { /* * fill out the message structure to display prompt message */ m->msg_style = msg_style; m->msg = messages[i]; pam_trace(PAM_DEBUG_CONV, "pam_conv_msg(%p:%d[%d]=%s)", (void *)pamh, msg_style, i, messages[i]); m++; i++; } /* * The UNIX pam modules always calls __pam_get_authtok() and * __pam_display_msg() with a NULL pointer as the conv_apdp. * In case the conv_apdp is NULL and the pam_convp->appdata_ptr * is not NULL, we should pass the pam_convp->appdata_ptr * to the conversation function. */ if (conv_apdp == NULL && pam_convp->appdata_ptr != NULL) conv_apdp = pam_convp->appdata_ptr; /* * Call conv function to display the prompt. */ retcode = (pam_convp->conv)(num_msg, &msg, ret_respp, conv_apdp); pam_trace(PAM_DEBUG_CONV, "pam_conv_resp(%p pam_conv = %s) ret_respp = %p", (void *)pamh, pam_strerror(pamh, retcode), (void *)ret_respp); if (*ret_respp == NULL) { pam_trace(PAM_DEBUG_CONV, "pam_conv_resp(%p No response requested)", (void *)pamh); } else if ((pam_debug & (PAM_DEBUG_CONV | PAM_DEBUG_AUTHTOK)) != 0) { struct pam_response *r = *ret_respp; for (i = 0; i < num_msg; i++, r++) { if (r->resp == NULL) { pam_trace(PAM_DEBUG_CONV, "pam_conv_resp(%p:" "[%d] NULL response string)", (void *)pamh, i); } else { if (msg_style == PAM_PROMPT_ECHO_OFF) { #ifdef DEBUG pam_trace(PAM_DEBUG_AUTHTOK, "pam_conv_resp(%p:[%d]=%s, " "code=%d)", (void *)pamh, i, r->resp, r->resp_retcode); #endif /* DEBUG */ pam_trace(PAM_DEBUG_CONV, "pam_conv_resp(%p:[%d] len=%lu, " "code=%d)", (void *)pamh, i, (ulong_t)strlen(r->resp), r->resp_retcode); } else { pam_trace(PAM_DEBUG_CONV, "pam_conv_resp(%p:[%d]=%s, " "code=%d)", (void *)pamh, i, r->resp, r->resp_retcode); } } } } if (msg) free(msg); return (retcode); } /* * __pam_display_msg(): * display message by calling the call back functions * provided by the application through "pam_conv" structure */ int __pam_display_msg(pam_handle_t *pamh, int msg_style, int num_msg, char messages[][PAM_MAX_MSG_SIZE], void *conv_apdp) { struct pam_response *ret_respp = NULL; int ret; if (num_msg <= 0 || num_msg > PAM_MAX_NUM_MSG) ret = PAM_CONV_ERR; else ret = do_conv(pamh, msg_style, num_msg, messages, conv_apdp, &ret_respp); if (ret_respp != NULL) free_resp(num_msg, ret_respp); return (ret); } /* * __pam_get_authtok() * retrieves a password of at most PASS_MAX length from the pam * handle (pam_get_item) or from the input stream (do_conv). * * This function allocates memory for the new authtok. * Applications calling this function are responsible for * freeing this memory. * * If "source" is * PAM_HANDLE * and "type" is: * PAM_AUTHTOK - password is taken from pam handle (PAM_AUTHTOK) * PAM_OLDAUTHTOK - password is taken from pam handle (PAM_OLDAUTHTOK) * * If "source" is * PAM_PROMPT * and "type" is: * 0: Prompt for new passwd, do not even attempt * to store it in the pam handle. * PAM_AUTHTOK: Prompt for new passwd, store in pam handle as * PAM_AUTHTOK item if this value is not already set. * PAM_OLDAUTHTOK: Prompt for new passwd, store in pam handle as * PAM_OLDAUTHTOK item if this value is not * already set. */ int __pam_get_authtok(pam_handle_t *pamh, int source, int type, char *prompt, char **authtok) { int error = PAM_SYSTEM_ERR; char *new_password = NULL; struct pam_response *ret_resp = NULL; char messages[PAM_MAX_NUM_MSG][PAM_MAX_MSG_SIZE]; if ((*authtok = calloc(PASS_MAX+1, sizeof (char))) == NULL) return (PAM_BUF_ERR); if (prompt == NULL) prompt = dgettext(TEXT_DOMAIN, "password: "); switch (source) { case PAM_HANDLE: /* get password from pam handle item list */ switch (type) { case PAM_AUTHTOK: case PAM_OLDAUTHTOK: if ((error = pam_get_item(pamh, type, (void **)&new_password)) != PAM_SUCCESS) goto err_ret; if (new_password == NULL || new_password[0] == '\0') { free(*authtok); *authtok = NULL; } else { (void) strlcpy(*authtok, new_password, PASS_MAX+1); } break; default: __pam_log(LOG_AUTH | LOG_ERR, "__pam_get_authtok() invalid type: %d", type); error = PAM_SYMBOL_ERR; goto err_ret; } break; case PAM_PROMPT: /* * Prompt for new password and save in pam handle item list * if the that item is not already set. */ (void) strncpy(messages[0], prompt, sizeof (messages[0])); if ((error = do_conv(pamh, PAM_PROMPT_ECHO_OFF, 1, messages, NULL, &ret_resp)) != PAM_SUCCESS) goto err_ret; if (ret_resp->resp == NULL) { /* getpass didn't return anything */ error = PAM_SYSTEM_ERR; goto err_ret; } /* save the new password if this item was NULL */ if (type) { if ((error = pam_get_item(pamh, type, (void **)&new_password)) != PAM_SUCCESS) { free_resp(1, ret_resp); goto err_ret; } if (new_password == NULL) (void) pam_set_item(pamh, type, ret_resp->resp); } (void) strlcpy(*authtok, ret_resp->resp, PASS_MAX+1); free_resp(1, ret_resp); break; default: __pam_log(LOG_AUTH | LOG_ERR, "__pam_get_authtok() invalid source: %d", source); error = PAM_SYMBOL_ERR; goto err_ret; } return (PAM_SUCCESS); err_ret: bzero(*authtok, PASS_MAX+1); free(*authtok); *authtok = NULL; return (error); }