1 | /* vi: set sw=4 ts=4: */
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2 | /* Copyright (C) 2003 Manuel Novoa III
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3 | *
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4 | * Licensed under GPLv2 or later, see file LICENSE in this source tree.
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5 | */
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6 |
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7 | /* Nov 6, 2003 Initial version.
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8 | *
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9 | * NOTE: This implementation is quite strict about requiring all
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10 | * field seperators. It also does not allow leading whitespace
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11 | * except when processing the numeric fields. glibc is more
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12 | * lenient. See the various glibc difference comments below.
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13 | *
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14 | * TODO:
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15 | * Move to dynamic allocation of (currently statically allocated)
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16 | * buffers; especially for the group-related functions since
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17 | * large group member lists will cause error returns.
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18 | */
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19 |
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20 | #include "libbb.h"
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21 | #include <assert.h>
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22 |
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23 | #ifndef _PATH_SHADOW
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24 | #define _PATH_SHADOW "/etc/shadow"
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25 | #endif
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26 | #ifndef _PATH_PASSWD
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27 | #define _PATH_PASSWD "/etc/passwd"
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28 | #endif
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29 | #ifndef _PATH_GROUP
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30 | #define _PATH_GROUP "/etc/group"
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31 | #endif
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32 |
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33 | /**********************************************************************/
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34 | /* Sizes for statically allocated buffers. */
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35 |
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36 | /* If you change these values, also change _SC_GETPW_R_SIZE_MAX and
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37 | * _SC_GETGR_R_SIZE_MAX in libc/unistd/sysconf.c to match */
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38 | #define PWD_BUFFER_SIZE 256
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39 | #define GRP_BUFFER_SIZE 256
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40 |
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41 | /**********************************************************************/
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42 | /* Prototypes for internal functions. */
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43 |
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44 | static int bb__pgsreader(
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45 | int FAST_FUNC (*parserfunc)(void *d, char *line),
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46 | void *data,
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47 | char *__restrict line_buff,
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48 | size_t buflen,
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49 | FILE *f);
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50 |
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51 | static int FAST_FUNC bb__parsepwent(void *pw, char *line);
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52 | static int FAST_FUNC bb__parsegrent(void *gr, char *line);
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53 | #if ENABLE_USE_BB_SHADOW
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54 | static int FAST_FUNC bb__parsespent(void *sp, char *line);
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55 | #endif
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56 |
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57 | /**********************************************************************/
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58 | /* We avoid having big global data. */
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59 |
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60 | struct statics {
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61 | /* Smaller things first */
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62 | struct passwd getpwuid_resultbuf;
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63 | struct group getgrgid_resultbuf;
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64 | struct passwd getpwnam_resultbuf;
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65 | struct group getgrnam_resultbuf;
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66 |
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67 | char getpwuid_buffer[PWD_BUFFER_SIZE];
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68 | char getgrgid_buffer[GRP_BUFFER_SIZE];
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69 | char getpwnam_buffer[PWD_BUFFER_SIZE];
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70 | char getgrnam_buffer[GRP_BUFFER_SIZE];
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71 | #if 0
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72 | struct passwd fgetpwent_resultbuf;
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73 | struct group fgetgrent_resultbuf;
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74 | struct spwd fgetspent_resultbuf;
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75 | char fgetpwent_buffer[PWD_BUFFER_SIZE];
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76 | char fgetgrent_buffer[GRP_BUFFER_SIZE];
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77 | char fgetspent_buffer[PWD_BUFFER_SIZE];
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78 | #endif
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79 | #if 0 //ENABLE_USE_BB_SHADOW
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80 | struct spwd getspuid_resultbuf;
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81 | struct spwd getspnam_resultbuf;
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82 | char getspuid_buffer[PWD_BUFFER_SIZE];
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83 | char getspnam_buffer[PWD_BUFFER_SIZE];
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84 | #endif
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85 | // Not converted - too small to bother
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86 | //pthread_mutex_t mylock = PTHREAD_MUTEX_INITIALIZER;
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87 | //FILE *pwf /*= NULL*/;
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88 | //FILE *grf /*= NULL*/;
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89 | //FILE *spf /*= NULL*/;
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90 | #if 0
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91 | struct passwd getpwent_pwd;
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92 | struct group getgrent_gr;
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93 | char getpwent_line_buff[PWD_BUFFER_SIZE];
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94 | char getgrent_line_buff[GRP_BUFFER_SIZE];
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95 | #endif
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96 | #if 0 //ENABLE_USE_BB_SHADOW
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97 | struct spwd getspent_spwd;
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98 | struct spwd sgetspent_spwd;
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99 | char getspent_line_buff[PWD_BUFFER_SIZE];
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100 | char sgetspent_line_buff[PWD_BUFFER_SIZE];
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101 | #endif
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102 | };
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103 |
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104 | static struct statics *ptr_to_statics;
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105 |
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106 | static struct statics *get_S(void)
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107 | {
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108 | if (!ptr_to_statics)
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109 | ptr_to_statics = xzalloc(sizeof(*ptr_to_statics));
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110 | return ptr_to_statics;
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111 | }
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112 |
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113 | /* Always use in this order, get_S() must be called first */
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114 | #define RESULTBUF(name) &((S = get_S())->name##_resultbuf)
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115 | #define BUFFER(name) (S->name##_buffer)
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116 |
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117 | /**********************************************************************/
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118 | /* For the various fget??ent_r funcs, return
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119 | *
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120 | * 0: success
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121 | * ENOENT: end-of-file encountered
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122 | * ERANGE: buflen too small
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123 | * other error values possible. See bb__pgsreader.
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124 | *
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125 | * Also, *result == resultbuf on success and NULL on failure.
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126 | *
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127 | * NOTE: glibc difference - For the ENOENT case, glibc also sets errno.
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128 | * We do not, as it really isn't an error if we reach the end-of-file.
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129 | * Doing so is analogous to having fgetc() set errno on EOF.
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130 | */
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131 | /**********************************************************************/
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132 |
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133 | int fgetpwent_r(FILE *__restrict stream, struct passwd *__restrict resultbuf,
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134 | char *__restrict buffer, size_t buflen,
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135 | struct passwd **__restrict result)
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136 | {
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137 | int rv;
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138 |
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139 | *result = NULL;
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140 |
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141 | rv = bb__pgsreader(bb__parsepwent, resultbuf, buffer, buflen, stream);
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142 | if (!rv) {
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143 | *result = resultbuf;
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144 | }
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145 |
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146 | return rv;
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147 | }
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148 |
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149 | int fgetgrent_r(FILE *__restrict stream, struct group *__restrict resultbuf,
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150 | char *__restrict buffer, size_t buflen,
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151 | struct group **__restrict result)
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152 | {
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153 | int rv;
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154 |
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155 | *result = NULL;
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156 |
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157 | rv = bb__pgsreader(bb__parsegrent, resultbuf, buffer, buflen, stream);
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158 | if (!rv) {
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159 | *result = resultbuf;
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160 | }
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161 |
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162 | return rv;
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163 | }
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164 |
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165 | #if ENABLE_USE_BB_SHADOW
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166 | #ifdef UNUSED_FOR_NOW
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167 | int fgetspent_r(FILE *__restrict stream, struct spwd *__restrict resultbuf,
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168 | char *__restrict buffer, size_t buflen,
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169 | struct spwd **__restrict result)
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170 | {
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171 | int rv;
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172 |
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173 | *result = NULL;
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174 |
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175 | rv = bb__pgsreader(bb__parsespent, resultbuf, buffer, buflen, stream);
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176 | if (!rv) {
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177 | *result = resultbuf;
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178 | }
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179 |
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180 | return rv;
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181 | }
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182 | #endif
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183 | #endif
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184 |
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185 | /**********************************************************************/
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186 | /* For the various fget??ent funcs, return NULL on failure and a
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187 | * pointer to the appropriate struct (statically allocated) on success.
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188 | * TODO: audit & stop using these in bbox, they pull in static buffers */
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189 | /**********************************************************************/
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190 |
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191 | #ifdef UNUSED_SINCE_WE_AVOID_STATIC_BUFS
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192 | struct passwd *fgetpwent(FILE *stream)
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193 | {
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194 | struct statics *S;
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195 | struct passwd *resultbuf = RESULTBUF(fgetpwent);
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196 | char *buffer = BUFFER(fgetpwent);
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197 | struct passwd *result;
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198 |
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199 | fgetpwent_r(stream, resultbuf, buffer, sizeof(BUFFER(fgetpwent)), &result);
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200 | return result;
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201 | }
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202 |
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203 | struct group *fgetgrent(FILE *stream)
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204 | {
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205 | struct statics *S;
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206 | struct group *resultbuf = RESULTBUF(fgetgrent);
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207 | char *buffer = BUFFER(fgetgrent);
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208 | struct group *result;
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209 |
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210 | fgetgrent_r(stream, resultbuf, buffer, sizeof(BUFFER(fgetgrent)), &result);
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211 | return result;
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212 | }
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213 | #endif
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214 |
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215 | #if ENABLE_USE_BB_SHADOW
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216 | #ifdef UNUSED_SINCE_WE_AVOID_STATIC_BUFS
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217 | struct spwd *fgetspent(FILE *stream)
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218 | {
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219 | struct statics *S;
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220 | struct spwd *resultbuf = RESULTBUF(fgetspent);
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221 | char *buffer = BUFFER(fgetspent);
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222 | struct spwd *result;
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223 |
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224 | fgetspent_r(stream, resultbuf, buffer, sizeof(BUFFER(fgetspent)), &result);
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225 | return result;
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226 | }
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227 | #endif
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228 |
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229 | #ifdef UNUSED_FOR_NOW
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230 | int sgetspent_r(const char *string, struct spwd *result_buf,
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231 | char *buffer, size_t buflen, struct spwd **result)
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232 | {
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233 | int rv = ERANGE;
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234 |
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235 | *result = NULL;
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236 |
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237 | if (buflen < PWD_BUFFER_SIZE) {
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238 | DO_ERANGE:
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239 | errno = rv;
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240 | goto DONE;
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241 | }
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242 |
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243 | if (string != buffer) {
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244 | if (strlen(string) >= buflen) {
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245 | goto DO_ERANGE;
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246 | }
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247 | strcpy(buffer, string);
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248 | }
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249 |
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250 | rv = bb__parsespent(result_buf, buffer);
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251 | if (!rv) {
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252 | *result = result_buf;
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253 | }
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254 |
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255 | DONE:
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256 | return rv;
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257 | }
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258 | #endif
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259 | #endif /* ENABLE_USE_BB_SHADOW */
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260 |
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261 | /**********************************************************************/
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262 |
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263 | #define GETXXKEY_R_FUNC getpwnam_r
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264 | #define GETXXKEY_R_PARSER bb__parsepwent
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265 | #define GETXXKEY_R_ENTTYPE struct passwd
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266 | #define GETXXKEY_R_TEST(ENT) (!strcmp((ENT)->pw_name, key))
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267 | #define GETXXKEY_R_KEYTYPE const char *__restrict
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268 | #define GETXXKEY_R_PATHNAME _PATH_PASSWD
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269 | #include "pwd_grp_internal.c"
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270 |
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271 | #define GETXXKEY_R_FUNC getgrnam_r
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272 | #define GETXXKEY_R_PARSER bb__parsegrent
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273 | #define GETXXKEY_R_ENTTYPE struct group
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274 | #define GETXXKEY_R_TEST(ENT) (!strcmp((ENT)->gr_name, key))
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275 | #define GETXXKEY_R_KEYTYPE const char *__restrict
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276 | #define GETXXKEY_R_PATHNAME _PATH_GROUP
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277 | #include "pwd_grp_internal.c"
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278 |
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279 | #if ENABLE_USE_BB_SHADOW
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280 | #define GETXXKEY_R_FUNC getspnam_r
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281 | #define GETXXKEY_R_PARSER bb__parsespent
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282 | #define GETXXKEY_R_ENTTYPE struct spwd
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283 | #define GETXXKEY_R_TEST(ENT) (!strcmp((ENT)->sp_namp, key))
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284 | #define GETXXKEY_R_KEYTYPE const char *__restrict
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285 | #define GETXXKEY_R_PATHNAME _PATH_SHADOW
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286 | #include "pwd_grp_internal.c"
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287 | #endif
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288 |
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289 | #define GETXXKEY_R_FUNC getpwuid_r
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290 | #define GETXXKEY_R_PARSER bb__parsepwent
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291 | #define GETXXKEY_R_ENTTYPE struct passwd
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292 | #define GETXXKEY_R_TEST(ENT) ((ENT)->pw_uid == key)
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293 | #define GETXXKEY_R_KEYTYPE uid_t
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294 | #define GETXXKEY_R_PATHNAME _PATH_PASSWD
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295 | #include "pwd_grp_internal.c"
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296 |
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297 | #define GETXXKEY_R_FUNC getgrgid_r
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298 | #define GETXXKEY_R_PARSER bb__parsegrent
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299 | #define GETXXKEY_R_ENTTYPE struct group
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300 | #define GETXXKEY_R_TEST(ENT) ((ENT)->gr_gid == key)
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301 | #define GETXXKEY_R_KEYTYPE gid_t
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302 | #define GETXXKEY_R_PATHNAME _PATH_GROUP
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303 | #include "pwd_grp_internal.c"
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304 |
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305 | /**********************************************************************/
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306 | /* TODO: audit & stop using these in bbox, they pull in static buffers */
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307 |
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308 | /* This one has many users */
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309 | struct passwd *getpwuid(uid_t uid)
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310 | {
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311 | struct statics *S;
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312 | struct passwd *resultbuf = RESULTBUF(getpwuid);
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313 | char *buffer = BUFFER(getpwuid);
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314 | struct passwd *result;
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315 |
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316 | getpwuid_r(uid, resultbuf, buffer, sizeof(BUFFER(getpwuid)), &result);
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317 | return result;
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318 | }
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319 |
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320 | /* This one has many users */
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321 | struct group *getgrgid(gid_t gid)
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322 | {
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323 | struct statics *S;
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324 | struct group *resultbuf = RESULTBUF(getgrgid);
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325 | char *buffer = BUFFER(getgrgid);
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326 | struct group *result;
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327 |
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328 | getgrgid_r(gid, resultbuf, buffer, sizeof(BUFFER(getgrgid)), &result);
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329 | return result;
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330 | }
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331 |
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332 | #if 0 //ENABLE_USE_BB_SHADOW
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333 | /* This function is non-standard and is currently not built. It seems
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334 | * to have been created as a reentrant version of the non-standard
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335 | * functions getspuid. Why getspuid was added, I do not know. */
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336 | int getspuid_r(uid_t uid, struct spwd *__restrict resultbuf,
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337 | char *__restrict buffer, size_t buflen,
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338 | struct spwd **__restrict result)
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339 | {
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340 | int rv;
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341 | struct passwd *pp;
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342 | struct passwd password;
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343 | char pwd_buff[PWD_BUFFER_SIZE];
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344 |
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345 | *result = NULL;
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346 | rv = getpwuid_r(uid, &password, pwd_buff, sizeof(pwd_buff), &pp);
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347 | if (!rv) {
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348 | rv = getspnam_r(password.pw_name, resultbuf, buffer, buflen, result);
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349 | }
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350 |
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351 | return rv;
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352 | }
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353 |
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354 | /* This function is non-standard and is currently not built.
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355 | * Why it was added, I do not know. */
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356 | struct spwd *getspuid(uid_t uid)
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357 | {
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358 | struct statics *S;
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359 | struct spwd *resultbuf = RESULTBUF(getspuid);
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360 | char *buffer = BUFFER(getspuid);
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361 | struct spwd *result;
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362 |
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363 | getspuid_r(uid, resultbuf, buffer, sizeof(BUFFER(getspuid)), &result);
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364 | return result;
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365 | }
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366 | #endif
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367 |
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368 | /* This one has many users */
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369 | struct passwd *getpwnam(const char *name)
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370 | {
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371 | struct statics *S;
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372 | struct passwd *resultbuf = RESULTBUF(getpwnam);
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373 | char *buffer = BUFFER(getpwnam);
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374 | struct passwd *result;
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375 |
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376 | getpwnam_r(name, resultbuf, buffer, sizeof(BUFFER(getpwnam)), &result);
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377 | return result;
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378 | }
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379 |
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380 | /* This one has many users */
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381 | struct group *getgrnam(const char *name)
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382 | {
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383 | struct statics *S;
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384 | struct group *resultbuf = RESULTBUF(getgrnam);
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385 | char *buffer = BUFFER(getgrnam);
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386 | struct group *result;
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387 |
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388 | getgrnam_r(name, resultbuf, buffer, sizeof(BUFFER(getgrnam)), &result);
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389 | return result;
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390 | }
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391 |
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392 | #if 0 //ENABLE_USE_BB_SHADOW
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393 | struct spwd *getspnam(const char *name)
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394 | {
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395 | struct statics *S;
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396 | struct spwd *resultbuf = RESULTBUF(getspnam);
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397 | char *buffer = BUFFER(getspnam);
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398 | struct spwd *result;
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399 |
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400 | getspnam_r(name, resultbuf, buffer, sizeof(BUFFER(getspnam)), &result);
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401 | return result;
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402 | }
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403 | #endif
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404 |
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405 | /**********************************************************************/
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406 |
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407 | /* FIXME: we don't have such CONFIG_xx - ?! */
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408 |
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409 | #if defined CONFIG_USE_BB_THREADSAFE_SHADOW && defined PTHREAD_MUTEX_INITIALIZER
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410 | static pthread_mutex_t mylock = PTHREAD_MUTEX_INITIALIZER;
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411 | # define LOCK pthread_mutex_lock(&mylock)
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412 | # define UNLOCK pthread_mutex_unlock(&mylock);
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413 | #else
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414 | # define LOCK ((void) 0)
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415 | # define UNLOCK ((void) 0)
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416 | #endif
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417 |
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418 | static FILE *pwf /*= NULL*/;
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419 | void setpwent(void)
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420 | {
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421 | LOCK;
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422 | if (pwf) {
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423 | rewind(pwf);
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424 | }
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425 | UNLOCK;
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426 | }
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427 |
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428 | void endpwent(void)
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429 | {
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430 | LOCK;
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431 | if (pwf) {
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432 | fclose(pwf);
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433 | pwf = NULL;
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434 | }
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435 | UNLOCK;
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436 | }
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437 |
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438 |
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439 | int getpwent_r(struct passwd *__restrict resultbuf,
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440 | char *__restrict buffer, size_t buflen,
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441 | struct passwd **__restrict result)
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442 | {
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443 | int rv;
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444 |
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445 | LOCK;
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446 | *result = NULL; /* In case of error... */
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447 |
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448 | if (!pwf) {
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449 | pwf = fopen_for_read(_PATH_PASSWD);
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450 | if (!pwf) {
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451 | rv = errno;
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452 | goto ERR;
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453 | }
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454 | }
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455 |
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---|
456 | rv = bb__pgsreader(bb__parsepwent, resultbuf, buffer, buflen, pwf);
|
---|
457 | if (!rv) {
|
---|
458 | *result = resultbuf;
|
---|
459 | }
|
---|
460 |
|
---|
461 | ERR:
|
---|
462 | UNLOCK;
|
---|
463 | return rv;
|
---|
464 | }
|
---|
465 |
|
---|
466 | static FILE *grf /*= NULL*/;
|
---|
467 | void setgrent(void)
|
---|
468 | {
|
---|
469 | LOCK;
|
---|
470 | if (grf) {
|
---|
471 | rewind(grf);
|
---|
472 | }
|
---|
473 | UNLOCK;
|
---|
474 | }
|
---|
475 |
|
---|
476 | void endgrent(void)
|
---|
477 | {
|
---|
478 | LOCK;
|
---|
479 | if (grf) {
|
---|
480 | fclose(grf);
|
---|
481 | grf = NULL;
|
---|
482 | }
|
---|
483 | UNLOCK;
|
---|
484 | }
|
---|
485 |
|
---|
486 | int getgrent_r(struct group *__restrict resultbuf,
|
---|
487 | char *__restrict buffer, size_t buflen,
|
---|
488 | struct group **__restrict result)
|
---|
489 | {
|
---|
490 | int rv;
|
---|
491 |
|
---|
492 | LOCK;
|
---|
493 | *result = NULL; /* In case of error... */
|
---|
494 |
|
---|
495 | if (!grf) {
|
---|
496 | grf = fopen_for_read(_PATH_GROUP);
|
---|
497 | if (!grf) {
|
---|
498 | rv = errno;
|
---|
499 | goto ERR;
|
---|
500 | }
|
---|
501 | }
|
---|
502 |
|
---|
503 | rv = bb__pgsreader(bb__parsegrent, resultbuf, buffer, buflen, grf);
|
---|
504 | if (!rv) {
|
---|
505 | *result = resultbuf;
|
---|
506 | }
|
---|
507 |
|
---|
508 | ERR:
|
---|
509 | UNLOCK;
|
---|
510 | return rv;
|
---|
511 | }
|
---|
512 |
|
---|
513 | #ifdef UNUSED_FOR_NOW
|
---|
514 | #if ENABLE_USE_BB_SHADOW
|
---|
515 | static FILE *spf /*= NULL*/;
|
---|
516 | void setspent(void)
|
---|
517 | {
|
---|
518 | LOCK;
|
---|
519 | if (spf) {
|
---|
520 | rewind(spf);
|
---|
521 | }
|
---|
522 | UNLOCK;
|
---|
523 | }
|
---|
524 |
|
---|
525 | void endspent(void)
|
---|
526 | {
|
---|
527 | LOCK;
|
---|
528 | if (spf) {
|
---|
529 | fclose(spf);
|
---|
530 | spf = NULL;
|
---|
531 | }
|
---|
532 | UNLOCK;
|
---|
533 | }
|
---|
534 |
|
---|
535 | int getspent_r(struct spwd *resultbuf, char *buffer,
|
---|
536 | size_t buflen, struct spwd **result)
|
---|
537 | {
|
---|
538 | int rv;
|
---|
539 |
|
---|
540 | LOCK;
|
---|
541 | *result = NULL; /* In case of error... */
|
---|
542 |
|
---|
543 | if (!spf) {
|
---|
544 | spf = fopen_for_read(_PATH_SHADOW);
|
---|
545 | if (!spf) {
|
---|
546 | rv = errno;
|
---|
547 | goto ERR;
|
---|
548 | }
|
---|
549 | }
|
---|
550 |
|
---|
551 | rv = bb__pgsreader(bb__parsespent, resultbuf, buffer, buflen, spf);
|
---|
552 | if (!rv) {
|
---|
553 | *result = resultbuf;
|
---|
554 | }
|
---|
555 |
|
---|
556 | ERR:
|
---|
557 | UNLOCK;
|
---|
558 | return rv;
|
---|
559 | }
|
---|
560 | #endif
|
---|
561 | #endif /* UNUSED_FOR_NOW */
|
---|
562 |
|
---|
563 | #ifdef UNUSED_SINCE_WE_AVOID_STATIC_BUFS
|
---|
564 | struct passwd *getpwent(void)
|
---|
565 | {
|
---|
566 | static char line_buff[PWD_BUFFER_SIZE];
|
---|
567 | static struct passwd pwd;
|
---|
568 | struct passwd *result;
|
---|
569 |
|
---|
570 | getpwent_r(&pwd, line_buff, sizeof(line_buff), &result);
|
---|
571 | return result;
|
---|
572 | }
|
---|
573 |
|
---|
574 | struct group *getgrent(void)
|
---|
575 | {
|
---|
576 | static char line_buff[GRP_BUFFER_SIZE];
|
---|
577 | static struct group gr;
|
---|
578 | struct group *result;
|
---|
579 |
|
---|
580 | getgrent_r(&gr, line_buff, sizeof(line_buff), &result);
|
---|
581 | return result;
|
---|
582 | }
|
---|
583 |
|
---|
584 | #if ENABLE_USE_BB_SHADOW
|
---|
585 | struct spwd *getspent(void)
|
---|
586 | {
|
---|
587 | static char line_buff[PWD_BUFFER_SIZE];
|
---|
588 | static struct spwd spwd;
|
---|
589 | struct spwd *result;
|
---|
590 |
|
---|
591 | getspent_r(&spwd, line_buff, sizeof(line_buff), &result);
|
---|
592 | return result;
|
---|
593 | }
|
---|
594 |
|
---|
595 | struct spwd *sgetspent(const char *string)
|
---|
596 | {
|
---|
597 | static char line_buff[PWD_BUFFER_SIZE];
|
---|
598 | static struct spwd spwd;
|
---|
599 | struct spwd *result;
|
---|
600 |
|
---|
601 | sgetspent_r(string, &spwd, line_buff, sizeof(line_buff), &result);
|
---|
602 | return result;
|
---|
603 | }
|
---|
604 | #endif
|
---|
605 | #endif /* UNUSED_SINCE_WE_AVOID_STATIC_BUFS */
|
---|
606 |
|
---|
607 | static gid_t *getgrouplist_internal(int *ngroups_ptr, const char *user, gid_t gid)
|
---|
608 | {
|
---|
609 | FILE *grfile;
|
---|
610 | gid_t *group_list;
|
---|
611 | int ngroups;
|
---|
612 | struct group group;
|
---|
613 | char buff[PWD_BUFFER_SIZE];
|
---|
614 |
|
---|
615 | /* We alloc space for 8 gids at a time. */
|
---|
616 | group_list = xmalloc(8 * sizeof(group_list[0]));
|
---|
617 | group_list[0] = gid;
|
---|
618 | ngroups = 1;
|
---|
619 |
|
---|
620 | grfile = fopen_for_read(_PATH_GROUP);
|
---|
621 | if (grfile) {
|
---|
622 | while (!bb__pgsreader(bb__parsegrent, &group, buff, sizeof(buff), grfile)) {
|
---|
623 | char **m;
|
---|
624 | assert(group.gr_mem); /* Must have at least a NULL terminator. */
|
---|
625 | if (group.gr_gid == gid)
|
---|
626 | continue;
|
---|
627 | for (m = group.gr_mem; *m; m++) {
|
---|
628 | if (strcmp(*m, user) != 0)
|
---|
629 | continue;
|
---|
630 | group_list = xrealloc_vector(group_list, /*8=2^3:*/ 3, ngroups);
|
---|
631 | group_list[ngroups++] = group.gr_gid;
|
---|
632 | break;
|
---|
633 | }
|
---|
634 | }
|
---|
635 | fclose(grfile);
|
---|
636 | }
|
---|
637 | *ngroups_ptr = ngroups;
|
---|
638 | return group_list;
|
---|
639 | }
|
---|
640 |
|
---|
641 | int initgroups(const char *user, gid_t gid)
|
---|
642 | {
|
---|
643 | int ngroups;
|
---|
644 | gid_t *group_list = getgrouplist_internal(&ngroups, user, gid);
|
---|
645 |
|
---|
646 | ngroups = setgroups(ngroups, group_list);
|
---|
647 | free(group_list);
|
---|
648 | return ngroups;
|
---|
649 | }
|
---|
650 |
|
---|
651 | int getgrouplist(const char *user, gid_t gid, gid_t *groups, int *ngroups)
|
---|
652 | {
|
---|
653 | int ngroups_old = *ngroups;
|
---|
654 | gid_t *group_list = getgrouplist_internal(ngroups, user, gid);
|
---|
655 |
|
---|
656 | if (*ngroups <= ngroups_old) {
|
---|
657 | ngroups_old = *ngroups;
|
---|
658 | memcpy(groups, group_list, ngroups_old * sizeof(groups[0]));
|
---|
659 | } else {
|
---|
660 | ngroups_old = -1;
|
---|
661 | }
|
---|
662 | free(group_list);
|
---|
663 | return ngroups_old;
|
---|
664 | }
|
---|
665 |
|
---|
666 | #ifdef UNUSED_SINCE_WE_AVOID_STATIC_BUFS
|
---|
667 | int putpwent(const struct passwd *__restrict p, FILE *__restrict f)
|
---|
668 | {
|
---|
669 | int rv = -1;
|
---|
670 |
|
---|
671 | #if 0
|
---|
672 | /* glibc does this check */
|
---|
673 | if (!p || !f) {
|
---|
674 | errno = EINVAL;
|
---|
675 | return rv;
|
---|
676 | }
|
---|
677 | #endif
|
---|
678 |
|
---|
679 | /* No extra thread locking is needed above what fprintf does. */
|
---|
680 | if (fprintf(f, "%s:%s:%lu:%lu:%s:%s:%s\n",
|
---|
681 | p->pw_name, p->pw_passwd,
|
---|
682 | (unsigned long)(p->pw_uid),
|
---|
683 | (unsigned long)(p->pw_gid),
|
---|
684 | p->pw_gecos, p->pw_dir, p->pw_shell) >= 0
|
---|
685 | ) {
|
---|
686 | rv = 0;
|
---|
687 | }
|
---|
688 |
|
---|
689 | return rv;
|
---|
690 | }
|
---|
691 |
|
---|
692 | int putgrent(const struct group *__restrict p, FILE *__restrict f)
|
---|
693 | {
|
---|
694 | int rv = -1;
|
---|
695 |
|
---|
696 | #if 0
|
---|
697 | /* glibc does this check */
|
---|
698 | if (!p || !f) {
|
---|
699 | errno = EINVAL;
|
---|
700 | return rv;
|
---|
701 | }
|
---|
702 | #endif
|
---|
703 |
|
---|
704 | if (fprintf(f, "%s:%s:%lu:",
|
---|
705 | p->gr_name, p->gr_passwd,
|
---|
706 | (unsigned long)(p->gr_gid)) >= 0
|
---|
707 | ) {
|
---|
708 | static const char format[] ALIGN1 = ",%s";
|
---|
709 |
|
---|
710 | char **m;
|
---|
711 | const char *fmt;
|
---|
712 |
|
---|
713 | fmt = format + 1;
|
---|
714 |
|
---|
715 | assert(p->gr_mem);
|
---|
716 | m = p->gr_mem;
|
---|
717 |
|
---|
718 | while (1) {
|
---|
719 | if (!*m) {
|
---|
720 | if (fputc('\n', f) >= 0) {
|
---|
721 | rv = 0;
|
---|
722 | }
|
---|
723 | break;
|
---|
724 | }
|
---|
725 | if (fprintf(f, fmt, *m) < 0) {
|
---|
726 | break;
|
---|
727 | }
|
---|
728 | m++;
|
---|
729 | fmt = format;
|
---|
730 | }
|
---|
731 | }
|
---|
732 |
|
---|
733 | return rv;
|
---|
734 | }
|
---|
735 | #endif
|
---|
736 |
|
---|
737 | #if ENABLE_USE_BB_SHADOW
|
---|
738 | #ifdef UNUSED_FOR_NOW
|
---|
739 | static const unsigned char put_sp_off[] ALIGN1 = {
|
---|
740 | offsetof(struct spwd, sp_lstchg), /* 2 - not a char ptr */
|
---|
741 | offsetof(struct spwd, sp_min), /* 3 - not a char ptr */
|
---|
742 | offsetof(struct spwd, sp_max), /* 4 - not a char ptr */
|
---|
743 | offsetof(struct spwd, sp_warn), /* 5 - not a char ptr */
|
---|
744 | offsetof(struct spwd, sp_inact), /* 6 - not a char ptr */
|
---|
745 | offsetof(struct spwd, sp_expire) /* 7 - not a char ptr */
|
---|
746 | };
|
---|
747 |
|
---|
748 | int putspent(const struct spwd *p, FILE *stream)
|
---|
749 | {
|
---|
750 | const char *fmt;
|
---|
751 | long x;
|
---|
752 | int i;
|
---|
753 | int rv = -1;
|
---|
754 |
|
---|
755 | /* Unlike putpwent and putgrent, glibc does not check the args. */
|
---|
756 | if (fprintf(stream, "%s:%s:", p->sp_namp,
|
---|
757 | (p->sp_pwdp ? p->sp_pwdp : "")) < 0
|
---|
758 | ) {
|
---|
759 | goto DO_UNLOCK;
|
---|
760 | }
|
---|
761 |
|
---|
762 | for (i = 0; i < sizeof(put_sp_off); i++) {
|
---|
763 | fmt = "%ld:";
|
---|
764 | x = *(long *)((char *)p + put_sp_off[i]);
|
---|
765 | if (x == -1) {
|
---|
766 | fmt += 3;
|
---|
767 | }
|
---|
768 | if (fprintf(stream, fmt, x) < 0) {
|
---|
769 | goto DO_UNLOCK;
|
---|
770 | }
|
---|
771 | }
|
---|
772 |
|
---|
773 | if ((p->sp_flag != ~0UL) && (fprintf(stream, "%lu", p->sp_flag) < 0)) {
|
---|
774 | goto DO_UNLOCK;
|
---|
775 | }
|
---|
776 |
|
---|
777 | if (fputc('\n', stream) > 0) {
|
---|
778 | rv = 0;
|
---|
779 | }
|
---|
780 |
|
---|
781 | DO_UNLOCK:
|
---|
782 | return rv;
|
---|
783 | }
|
---|
784 | #endif
|
---|
785 | #endif /* USE_BB_SHADOW */
|
---|
786 |
|
---|
787 | /**********************************************************************/
|
---|
788 | /* Internal functions */
|
---|
789 | /**********************************************************************/
|
---|
790 |
|
---|
791 | static const unsigned char pw_off[] ALIGN1 = {
|
---|
792 | offsetof(struct passwd, pw_name), /* 0 */
|
---|
793 | offsetof(struct passwd, pw_passwd), /* 1 */
|
---|
794 | offsetof(struct passwd, pw_uid), /* 2 - not a char ptr */
|
---|
795 | offsetof(struct passwd, pw_gid), /* 3 - not a char ptr */
|
---|
796 | offsetof(struct passwd, pw_gecos), /* 4 */
|
---|
797 | offsetof(struct passwd, pw_dir), /* 5 */
|
---|
798 | offsetof(struct passwd, pw_shell) /* 6 */
|
---|
799 | };
|
---|
800 |
|
---|
801 | static int FAST_FUNC bb__parsepwent(void *data, char *line)
|
---|
802 | {
|
---|
803 | char *endptr;
|
---|
804 | char *p;
|
---|
805 | int i;
|
---|
806 |
|
---|
807 | i = 0;
|
---|
808 | while (1) {
|
---|
809 | p = (char *) data + pw_off[i];
|
---|
810 |
|
---|
811 | if (i < 2 || i > 3) {
|
---|
812 | *((char **) p) = line;
|
---|
813 | if (i == 6) {
|
---|
814 | return 0;
|
---|
815 | }
|
---|
816 | /* NOTE: glibc difference - glibc allows omission of
|
---|
817 | * ':' seperators after the gid field if all remaining
|
---|
818 | * entries are empty. We require all separators. */
|
---|
819 | line = strchr(line, ':');
|
---|
820 | if (!line) {
|
---|
821 | break;
|
---|
822 | }
|
---|
823 | } else {
|
---|
824 | unsigned long t = strtoul(line, &endptr, 10);
|
---|
825 | /* Make sure we had at least one digit, and that the
|
---|
826 | * failing char is the next field seperator ':'. See
|
---|
827 | * glibc difference note above. */
|
---|
828 | /* TODO: Also check for leading whitespace? */
|
---|
829 | if ((endptr == line) || (*endptr != ':')) {
|
---|
830 | break;
|
---|
831 | }
|
---|
832 | line = endptr;
|
---|
833 | if (i & 1) { /* i == 3 -- gid */
|
---|
834 | *((gid_t *) p) = t;
|
---|
835 | } else { /* i == 2 -- uid */
|
---|
836 | *((uid_t *) p) = t;
|
---|
837 | }
|
---|
838 | }
|
---|
839 |
|
---|
840 | *line++ = '\0';
|
---|
841 | i++;
|
---|
842 | } /* while (1) */
|
---|
843 |
|
---|
844 | return -1;
|
---|
845 | }
|
---|
846 |
|
---|
847 | /**********************************************************************/
|
---|
848 |
|
---|
849 | static const unsigned char gr_off[] ALIGN1 = {
|
---|
850 | offsetof(struct group, gr_name), /* 0 */
|
---|
851 | offsetof(struct group, gr_passwd), /* 1 */
|
---|
852 | offsetof(struct group, gr_gid) /* 2 - not a char ptr */
|
---|
853 | };
|
---|
854 |
|
---|
855 | static int FAST_FUNC bb__parsegrent(void *data, char *line)
|
---|
856 | {
|
---|
857 | char *endptr;
|
---|
858 | char *p;
|
---|
859 | int i;
|
---|
860 | char **members;
|
---|
861 | char *end_of_buf;
|
---|
862 |
|
---|
863 | end_of_buf = ((struct group *) data)->gr_name; /* Evil hack! */
|
---|
864 | i = 0;
|
---|
865 | while (1) {
|
---|
866 | p = (char *) data + gr_off[i];
|
---|
867 |
|
---|
868 | if (i < 2) {
|
---|
869 | *((char **) p) = line;
|
---|
870 | line = strchr(line, ':');
|
---|
871 | if (!line) {
|
---|
872 | break;
|
---|
873 | }
|
---|
874 | *line++ = '\0';
|
---|
875 | i++;
|
---|
876 | } else {
|
---|
877 | *((gid_t *) p) = strtoul(line, &endptr, 10);
|
---|
878 |
|
---|
879 | /* NOTE: glibc difference - glibc allows omission of the
|
---|
880 | * trailing colon when there is no member list. We treat
|
---|
881 | * this as an error. */
|
---|
882 |
|
---|
883 | /* Make sure we had at least one digit, and that the
|
---|
884 | * failing char is the next field seperator ':'. See
|
---|
885 | * glibc difference note above. */
|
---|
886 | if ((endptr == line) || (*endptr != ':')) {
|
---|
887 | break;
|
---|
888 | }
|
---|
889 |
|
---|
890 | i = 1; /* Count terminating NULL ptr. */
|
---|
891 | p = endptr;
|
---|
892 |
|
---|
893 | if (p[1]) { /* We have a member list to process. */
|
---|
894 | /* Overwrite the last ':' with a ',' before counting.
|
---|
895 | * This allows us to (1) test for initial ','
|
---|
896 | * and (2) adds one ',' so that the number of commas
|
---|
897 | * equals the member count. */
|
---|
898 | *p = ',';
|
---|
899 | do {
|
---|
900 | /* NOTE: glibc difference - glibc allows and trims leading
|
---|
901 | * (but not trailing) space. We treat this as an error. */
|
---|
902 | /* NOTE: glibc difference - glibc allows consecutive and
|
---|
903 | * trailing commas, and ignores "empty string" users. We
|
---|
904 | * treat this as an error. */
|
---|
905 | if (*p == ',') {
|
---|
906 | ++i;
|
---|
907 | *p = 0; /* nul-terminate each member string. */
|
---|
908 | if (!*++p || (*p == ',') || isspace(*p)) {
|
---|
909 | goto ERR;
|
---|
910 | }
|
---|
911 | }
|
---|
912 | } while (*++p);
|
---|
913 | }
|
---|
914 |
|
---|
915 | /* Now align (p+1), rounding up. */
|
---|
916 | /* Assumes sizeof(char **) is a power of 2. */
|
---|
917 | members = (char **)( (((intptr_t) p) + sizeof(char **))
|
---|
918 | & ~((intptr_t)(sizeof(char **) - 1)) );
|
---|
919 |
|
---|
920 | if (((char *)(members + i)) > end_of_buf) { /* No space. */
|
---|
921 | break;
|
---|
922 | }
|
---|
923 |
|
---|
924 | ((struct group *) data)->gr_mem = members;
|
---|
925 |
|
---|
926 | if (--i) {
|
---|
927 | p = endptr; /* Pointing to char prior to first member. */
|
---|
928 | while (1) {
|
---|
929 | *members++ = ++p;
|
---|
930 | if (!--i)
|
---|
931 | break;
|
---|
932 | while (*++p)
|
---|
933 | continue;
|
---|
934 | }
|
---|
935 | }
|
---|
936 | *members = NULL;
|
---|
937 |
|
---|
938 | return 0;
|
---|
939 | }
|
---|
940 | } /* while (1) */
|
---|
941 |
|
---|
942 | ERR:
|
---|
943 | return -1;
|
---|
944 | }
|
---|
945 |
|
---|
946 | /**********************************************************************/
|
---|
947 |
|
---|
948 | #if ENABLE_USE_BB_SHADOW
|
---|
949 | static const unsigned char sp_off[] ALIGN1 = {
|
---|
950 | offsetof(struct spwd, sp_namp), /* 0: char* */
|
---|
951 | offsetof(struct spwd, sp_pwdp), /* 1: char* */
|
---|
952 | offsetof(struct spwd, sp_lstchg), /* 2: long */
|
---|
953 | offsetof(struct spwd, sp_min), /* 3: long */
|
---|
954 | offsetof(struct spwd, sp_max), /* 4: long */
|
---|
955 | offsetof(struct spwd, sp_warn), /* 5: long */
|
---|
956 | offsetof(struct spwd, sp_inact), /* 6: long */
|
---|
957 | offsetof(struct spwd, sp_expire), /* 7: long */
|
---|
958 | offsetof(struct spwd, sp_flag) /* 8: unsigned long */
|
---|
959 | };
|
---|
960 |
|
---|
961 | static int FAST_FUNC bb__parsespent(void *data, char *line)
|
---|
962 | {
|
---|
963 | char *endptr;
|
---|
964 | char *p;
|
---|
965 | int i;
|
---|
966 |
|
---|
967 | i = 0;
|
---|
968 | while (1) {
|
---|
969 | p = (char *) data + sp_off[i];
|
---|
970 | if (i < 2) {
|
---|
971 | *((char **) p) = line;
|
---|
972 | line = strchr(line, ':');
|
---|
973 | if (!line) {
|
---|
974 | break; /* error */
|
---|
975 | }
|
---|
976 | } else {
|
---|
977 | *((long *) p) = strtoul(line, &endptr, 10);
|
---|
978 | if (endptr == line) {
|
---|
979 | *((long *) p) = -1L;
|
---|
980 | }
|
---|
981 | line = endptr;
|
---|
982 | if (i == 8) {
|
---|
983 | if (*line != '\0') {
|
---|
984 | break; /* error */
|
---|
985 | }
|
---|
986 | return 0; /* all ok */
|
---|
987 | }
|
---|
988 | if (*line != ':') {
|
---|
989 | break; /* error */
|
---|
990 | }
|
---|
991 | }
|
---|
992 | *line++ = '\0';
|
---|
993 | i++;
|
---|
994 | }
|
---|
995 |
|
---|
996 | return EINVAL;
|
---|
997 | }
|
---|
998 | #endif
|
---|
999 |
|
---|
1000 | /**********************************************************************/
|
---|
1001 |
|
---|
1002 | /* Reads until EOF, or until it finds a line which fits in the buffer
|
---|
1003 | * and for which the parser function succeeds.
|
---|
1004 | *
|
---|
1005 | * Returns 0 on success and ENOENT for end-of-file (glibc convention).
|
---|
1006 | */
|
---|
1007 | static int bb__pgsreader(
|
---|
1008 | int FAST_FUNC (*parserfunc)(void *d, char *line),
|
---|
1009 | void *data,
|
---|
1010 | char *__restrict line_buff,
|
---|
1011 | size_t buflen,
|
---|
1012 | FILE *f)
|
---|
1013 | {
|
---|
1014 | int skip;
|
---|
1015 | int rv = ERANGE;
|
---|
1016 |
|
---|
1017 | if (buflen < PWD_BUFFER_SIZE) {
|
---|
1018 | errno = rv;
|
---|
1019 | return rv;
|
---|
1020 | }
|
---|
1021 |
|
---|
1022 | skip = 0;
|
---|
1023 | while (1) {
|
---|
1024 | if (!fgets(line_buff, buflen, f)) {
|
---|
1025 | if (feof(f)) {
|
---|
1026 | rv = ENOENT;
|
---|
1027 | }
|
---|
1028 | break;
|
---|
1029 | }
|
---|
1030 |
|
---|
1031 | {
|
---|
1032 | int line_len = strlen(line_buff) - 1;
|
---|
1033 | if (line_len >= 0 && line_buff[line_len] == '\n') {
|
---|
1034 | line_buff[line_len] = '\0';
|
---|
1035 | } else
|
---|
1036 | if (line_len + 2 == buflen) {
|
---|
1037 | /* A start (or continuation) of overlong line */
|
---|
1038 | skip = 1;
|
---|
1039 | continue;
|
---|
1040 | } /* else: a last line in the file, and it has no '\n' */
|
---|
1041 | }
|
---|
1042 |
|
---|
1043 | if (skip) {
|
---|
1044 | /* This "line" is a remainder of overlong line, ignore */
|
---|
1045 | skip = 0;
|
---|
1046 | continue;
|
---|
1047 | }
|
---|
1048 |
|
---|
1049 | /* NOTE: glibc difference - glibc strips leading whitespace from
|
---|
1050 | * records. We do not allow leading whitespace. */
|
---|
1051 |
|
---|
1052 | /* Skip empty lines, comment lines, and lines with leading
|
---|
1053 | * whitespace. */
|
---|
1054 | if (line_buff[0] != '\0' && line_buff[0] != '#' && !isspace(line_buff[0])) {
|
---|
1055 | if (parserfunc == bb__parsegrent) {
|
---|
1056 | /* Do evil group hack:
|
---|
1057 | * The group entry parsing function needs to know where
|
---|
1058 | * the end of the buffer is so that it can construct the
|
---|
1059 | * group member ptr table. */
|
---|
1060 | ((struct group *) data)->gr_name = line_buff + buflen;
|
---|
1061 | }
|
---|
1062 | if (parserfunc(data, line_buff) == 0) {
|
---|
1063 | rv = 0;
|
---|
1064 | break;
|
---|
1065 | }
|
---|
1066 | }
|
---|
1067 | } /* while (1) */
|
---|
1068 |
|
---|
1069 | return rv;
|
---|
1070 | }
|
---|