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/*
 * Copyright (c) 2009-2013 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 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 */

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