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sudo_plugin.h
/* * Copyright (c) 2009-2016 Todd C. Miller <Todd.Miller@courtesan.com> * * Permission to use, copy, modify, and distribute this software for any * purpose with or without fee is hereby granted, provided that the above * copyright notice and this permission notice appear in all copies. * * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */ #ifndef SUDO_PLUGIN_H #define SUDO_PLUGIN_H /* API version major/minor */ #define SUDO_API_VERSION_MAJOR 1 #define SUDO_API_VERSION_MINOR 9 #define SUDO_API_MKVERSION(x, y) (((x) << 16) | (y)) #define SUDO_API_VERSION SUDO_API_MKVERSION(SUDO_API_VERSION_MAJOR, SUDO_API_VERSION_MINOR) /* Getters and setters for plugin API versions */ #define SUDO_API_VERSION_GET_MAJOR(v) ((v) >> 16) #define SUDO_API_VERSION_GET_MINOR(v) ((v) & 0xffffU) #define SUDO_API_VERSION_SET_MAJOR(vp, n) do { \ *(vp) = (*(vp) & 0x0000ffffU) | ((n) << 16); \ } while(0) #define SUDO_API_VERSION_SET_MINOR(vp, n) do { \ *(vp) = (*(vp) & 0xffff0000U) | (n); \ } while(0) /* Conversation function types and defines */ struct sudo_conv_message { #define SUDO_CONV_PROMPT_ECHO_OFF 0x0001 /* do not echo user input */ #define SUDO_CONV_PROMPT_ECHO_ON 0x0002 /* echo user input */ #define SUDO_CONV_ERROR_MSG 0x0003 /* error message */ #define SUDO_CONV_INFO_MSG 0x0004 /* informational message */ #define SUDO_CONV_PROMPT_MASK 0x0005 /* mask user input */ #define SUDO_CONV_PROMPT_ECHO_OK 0x1000 /* flag: allow echo if no tty */ int msg_type; int timeout; const char *msg; }; /* * Maximum length of a reply (not including the trailing NUL) when * conversing with the user. In practical terms, this is the longest * password sudo will support. This means that a buffer of size * SUDO_CONV_REPL_MAX+1 is guaranteed to be able to hold any reply * from the conversation function. It is also useful as a max value * for memset_s() when clearing passwords returned by the conversation * function. */ #define SUDO_CONV_REPL_MAX 255 struct sudo_conv_reply { char *reply; }; /* Conversation callback API version major/minor */ #define SUDO_CONV_CALLBACK_VERSION_MAJOR 1 #define SUDO_CONV_CALLBACK_VERSION_MINOR 0 #define SUDO_CONV_CALLBACK_VERSION SUDO_API_MKVERSION(SUDO_CONV_CALLBACK_VERSION_MAJOR, SUDO_CONV_CALLBACK_VERSION_MINOR) /* * Callback struct to be passed to the conversation function. * Can be used to perform operations on suspend/resume such * as dropping/acquiring locks. */ typedef int (*sudo_conv_callback_fn_t)(int signo, void *closure); struct sudo_conv_callback { unsigned int version; void *closure; sudo_conv_callback_fn_t on_suspend; sudo_conv_callback_fn_t on_resume; }; typedef int (*sudo_conv_t)(int num_msgs, const struct sudo_conv_message msgs[], struct sudo_conv_reply replies[], struct sudo_conv_callback *callback); typedef int (*sudo_printf_t)(int msg_type, const char *fmt, ...); /* * Hooks allow a plugin to hook into specific sudo and/or libc functions. */ /* Hook functions typedefs. */ typedef int (*sudo_hook_fn_t)(); typedef int (*sudo_hook_fn_setenv_t)(const char *name, const char *value, int overwrite, void *closure); typedef int (*sudo_hook_fn_putenv_t)(char *string, void *closure); typedef int (*sudo_hook_fn_getenv_t)(const char *name, char **value, void *closure); typedef int (*sudo_hook_fn_unsetenv_t)(const char *name, void *closure); /* Hook structure definition. */ struct sudo_hook { unsigned int hook_version; unsigned int hook_type; sudo_hook_fn_t hook_fn; void *closure; }; /* Hook API version major/minor */ #define SUDO_HOOK_VERSION_MAJOR 1 #define SUDO_HOOK_VERSION_MINOR 0 #define SUDO_HOOK_VERSION SUDO_API_MKVERSION(SUDO_HOOK_VERSION_MAJOR, SUDO_HOOK_VERSION_MINOR) /* * Hook function return values. */ #define SUDO_HOOK_RET_ERROR -1 /* error */ #define SUDO_HOOK_RET_NEXT 0 /* go to the next hook in the list */ #define SUDO_HOOK_RET_STOP 1 /* stop hook processing for this type */ /* * Hooks for setenv/unsetenv/putenv/getenv. * This allows the plugin to be notified when a PAM module modifies * the environment so it can update the copy of the environment that * is passed to execve(). */ #define SUDO_HOOK_SETENV 1 #define SUDO_HOOK_UNSETENV 2 #define SUDO_HOOK_PUTENV 3 #define SUDO_HOOK_GETENV 4 /* Policy plugin type and defines */ struct passwd; struct policy_plugin { #define SUDO_POLICY_PLUGIN 1 unsigned int type; /* always SUDO_POLICY_PLUGIN */ unsigned int version; /* always SUDO_API_VERSION */ int (*open)(unsigned int version, sudo_conv_t conversation, sudo_printf_t sudo_printf, char * const settings[], char * const user_info[], char * const user_env[], char * const plugin_plugins[]); void (*close)(int exit_status, int error); /* wait status or error */ int (*show_version)(int verbose); int (*check_policy)(int argc, char * const argv[], char *env_add[], char **command_info[], char **argv_out[], char **user_env_out[]); int (*list)(int argc, char * const argv[], int verbose, const char *list_user); int (*validate)(void); void (*invalidate)(int remove); int (*init_session)(struct passwd *pwd, char **user_env_out[]); void (*register_hooks)(int version, int (*register_hook)(struct sudo_hook *hook)); void (*deregister_hooks)(int version, int (*deregister_hook)(struct sudo_hook *hook)); }; /* I/O plugin type and defines */ struct io_plugin { #define SUDO_IO_PLUGIN 2 unsigned int type; /* always SUDO_IO_PLUGIN */ unsigned int version; /* always SUDO_API_VERSION */ int (*open)(unsigned int version, sudo_conv_t conversation, sudo_printf_t sudo_printf, char * const settings[], char * const user_info[], char * const command_info[], int argc, char * const argv[], char * const user_env[], char * const plugin_plugins[]); void (*close)(int exit_status, int error); /* wait status or error */ int (*show_version)(int verbose); int (*log_ttyin)(const char *buf, unsigned int len); int (*log_ttyout)(const char *buf, unsigned int len); int (*log_stdin)(const char *buf, unsigned int len); int (*log_stdout)(const char *buf, unsigned int len); int (*log_stderr)(const char *buf, unsigned int len); void (*register_hooks)(int version, int (*register_hook)(struct sudo_hook *hook)); void (*deregister_hooks)(int version, int (*deregister_hook)(struct sudo_hook *hook)); }; /* Sudoers group plugin version major/minor */ #define GROUP_API_VERSION_MAJOR 1 #define GROUP_API_VERSION_MINOR 0 #define GROUP_API_VERSION SUDO_API_MKVERSION(GROUP_API_VERSION_MAJOR, GROUP_API_VERSION_MINOR) /* Getters and setters for group version (for source compat only) */ #define GROUP_API_VERSION_GET_MAJOR(v) SUDO_API_VERSION_GET_MAJOR(v) #define GROUP_API_VERSION_GET_MINOR(v) SUDO_API_VERSION_GET_MINOR(v) #define GROUP_API_VERSION_SET_MAJOR(vp, n) SUDO_API_VERSION_SET_MAJOR(vp, n) #define GROUP_API_VERSION_SET_MINOR(vp, n) SUDO_API_VERSION_SET_MINOR(vp, n) /* * version: for compatibility checking * group_init: return 1 on success, 0 if unconfigured, -1 on error. * group_cleanup: called to clean up resources used by provider * user_in_group: returns 1 if user is in group, 0 if not. * note that pwd may be NULL if the user is not in passwd. */ struct sudoers_group_plugin { unsigned int version; int (*init)(int version, sudo_printf_t sudo_printf, char *const argv[]); void (*cleanup)(void); int (*query)(const char *user, const char *group, const struct passwd *pwd); }; #endif /* SUDO_PLUGIN_H */