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lirc-utils.c

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1 /****************************************************************************

2 * lirc-utils.c *************************************************************

3 ****************************************************************************

4 */

12 #include <grp.h>

13 #include <pwd.h>

14 #include <stdlib.h>

15 #include <string.h>

16 #include <sys/types.h>

17 #include <unistd.h>

19 #ifdef HAVE_CONFIG_H

20 # include <config.h>

21 #endif

23 #include "lirc/lirc_log.h"

24 #include "lirc-utils.h"

26 static const logchannel_t logchannel = LOG_LIB;

28 const char* drop_sudo_root(int (*set_some_uid)(uid_t))

29 {

30 struct passwd* pw;

31 char* user;

32 GETGROUPS_T groups[32];

33 int group_cnt = sizeof(groups)/sizeof(gid_t);

34 char groupnames[256] = {0};

35 char buff[12];

36 int r;

37 int i;

39 if (getuid() != 0)

40 return "";

41 user = getenv("SUDO_USER");

42 if (user == NULL)

43 return "root";

44 pw = getpwnam(user);

45 if (pw == NULL) {

46 log_perror_err("Can't run getpwnam() for %s", user);

47 return "";

48 }

49 r = getgrouplist(user, pw->pw_gid, groups, &group_cnt);

50 if (r == -1) {

51 log_perror_warn("Cannot get supplementary groups");

52 return "";

53 }

54 r = setgroups(group_cnt, groups);

55 if (r == -1) {

56 log_perror_warn("Cannot set supplementary groups");

57 return "";

58 }

59 r = setgid(pw->pw_gid);

60 if (r == -1) {

61 log_perror_warn("Cannot set GID");

62 return "";

63 }

64 r = set_some_uid(pw->pw_uid);

65 if (r == -1) {

66 log_perror_warn("Cannot change UID to %d", pw->pw_uid);

67 return "";

68 }

69 setenv("HOME", pw->pw_dir, 1);

70 log_notice("Running as user %s", user);

71 for (i = 0; i < group_cnt; i += 1) {

72 snprintf(buff, 5, " %d", groups[i]);

73 strcat(groupnames, buff);

74 }

75 log_debug("Groups: [%d]:%s", pw->pw_gid, groupnames);

77 return pw->pw_name;

78 }

81 void drop_root_cli(int (*set_some_uid)(uid_t))

82 {

83 const char* new_user;

85 new_user = drop_sudo_root(set_some_uid);

86 if (strcmp("root", new_user) == 0)

87 puts("Warning: Running as root.");

88 else if (strlen(new_user) == 0)

89 puts("Warning: Cannot change uid.");

90 else

91 printf("Running as regular user %s\n", new_user);

92 }

log_debug

#define log_debug(fmt,...)

Log a debug message.

Definition: lirc_log.h:124

logchannel_t

Log channels used to filter messages.

Definition: lirc_log.h:53

log_perror_err

#define log_perror_err(fmt,...)

perror wrapper logging with level LIRC_ERROR.

Definition: lirc_log.h:89

lirc-utils.h

Utilities.

drop_root_cli

void drop_root_cli(int(*set_some_uid)(uid_t))

Default view part of drop_sudo_root.

Definition: lirc-utils.c:81

drop_sudo_root

const char * drop_sudo_root(int(*set_some_uid)(uid_t))

Try to drop possible root privileges, returning new user or "" on error.

Definition: lirc-utils.c:28

log_perror_warn

#define log_perror_warn(fmt,...)

perror wrapper logging with level LIRC_WARNING.

Definition: lirc_log.h:94

log_notice

#define log_notice(fmt,...)

Log a notice message.

Definition: lirc_log.h:119

lib
lirc-utils.c
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