/*
* Copyright (c) 2009-2013 Todd C. Miller <[email protected]>
*
* 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 5
#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 API version */
#define SUDO_API_VERSION_GET_MAJOR(v) ((v) >> 16)
#define SUDO_API_VERSION_GET_MINOR(v) ((v) & 0xffff)
#define SUDO_API_VERSION_SET_MAJOR(vp, n) do { \
*(vp) = (*(vp) & 0x0000ffff) | ((n) << 16); \
} while(0)
#define SUDO_API_VERSION_SET_MINOR(vp, n) do { \
*(vp) = (*(vp) & 0xffff0000) | (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_DEBUG_MSG 0x0006 /* debugging message */
#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;
};

typedef int (*sudo_conv_t)(int num_msgs, const struct sudo_conv_message msgs[],
struct sudo_conv_reply replies[]);
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 {
int hook_version;
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_MKVERSION(x, y) ((x << 16) | y)
#define SUDO_HOOK_VERSION SUDO_HOOK_MKVERSION(SUDO_HOOK_VERSION_MAJOR, SUDO_HOOK_VERSION_MINOR)

/* Getters and setters for hook API version */
#define SUDO_HOOK_VERSION_GET_MAJOR(v) ((v) >> 16)
#define SUDO_HOOK_VERSION_GET_MINOR(v) ((v) & 0xffff)
#define SUDO_HOOK_VERSION_SET_MAJOR(vp, n) do { \
*(vp) = (*(vp) & 0x0000ffff) | ((n) << 16); \
} while(0)
#define SUDO_HOOK_VERSION_SET_MINOR(vp, n) do { \
*(vp) = (*(vp) & 0xffff0000) | (n); \
} while(0)

/*
* 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 ((GROUP_API_VERSION_MAJOR << 16) | GROUP_API_VERSION_MINOR)

/* Getters and setters for group version */
#define GROUP_API_VERSION_GET_MAJOR(v) ((v) >> 16)
#define GROUP_API_VERSION_GET_MINOR(v) ((v) & 0xffff)
#define GROUP_API_VERSION_SET_MAJOR(vp, n) do { \
*(vp) = (*(vp) & 0x0000ffff) | ((n) << 16); \
} while(0)
#define GROUP_API_VERSION_SET_MINOR(vp, n) do { \
*(vp) = (*(vp) & 0xffff0000) | (n); \
} while(0)

/*
* 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 */