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 GPL v2, or later. See file LICENSE in this tarball.
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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 |
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21 | #include "libbb.h"
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22 | #include <features.h>
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23 | #include <assert.h>
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24 |
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25 | #ifndef _PATH_SHADOW
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26 | #define _PATH_SHADOW "/etc/shadow"
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27 | #endif
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28 | #ifndef _PATH_PASSWD
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29 | #define _PATH_PASSWD "/etc/passwd"
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30 | #endif
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31 | #ifndef _PATH_GROUP
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32 | #define _PATH_GROUP "/etc/group"
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33 | #endif
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34 |
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35 | /**********************************************************************/
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36 | /* Sizes for statically allocated buffers. */
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37 |
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38 | /* If you change these values, also change _SC_GETPW_R_SIZE_MAX and
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39 | * _SC_GETGR_R_SIZE_MAX in libc/unistd/sysconf.c to match */
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40 | #define PWD_BUFFER_SIZE 256
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41 | #define GRP_BUFFER_SIZE 256
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42 |
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43 | /**********************************************************************/
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44 | /* Prototypes for internal functions. */
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45 |
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46 | static int bb__pgsreader(int (*parserfunc)(void *d, char *line), void *data,
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47 | char *__restrict line_buff, size_t buflen, FILE *f);
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48 |
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49 | static int bb__parsepwent(void *pw, char *line);
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50 | static int bb__parsegrent(void *gr, char *line);
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51 | #if ENABLE_USE_BB_SHADOW
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52 | static int bb__parsespent(void *sp, char *line);
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53 | #endif
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54 |
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55 | /**********************************************************************/
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56 | /* We avoid having big global data. */
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57 |
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58 | struct statics {
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59 | /* Smaller things first */
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60 | struct passwd getpwuid_resultbuf;
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61 | struct group getgrgid_resultbuf;
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62 | struct passwd getpwnam_resultbuf;
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63 | struct group getgrnam_resultbuf;
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64 |
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65 | char getpwuid_buffer[PWD_BUFFER_SIZE];
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66 | char getgrgid_buffer[GRP_BUFFER_SIZE];
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67 | char getpwnam_buffer[PWD_BUFFER_SIZE];
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68 | char getgrnam_buffer[GRP_BUFFER_SIZE];
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69 | #if 0
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70 | struct passwd fgetpwent_resultbuf;
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71 | struct group fgetgrent_resultbuf;
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72 | struct spwd fgetspent_resultbuf;
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73 | char fgetpwent_buffer[PWD_BUFFER_SIZE];
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74 | char fgetgrent_buffer[GRP_BUFFER_SIZE];
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75 | char fgetspent_buffer[PWD_BUFFER_SIZE];
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76 | #endif
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77 | #if 0 //ENABLE_USE_BB_SHADOW
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78 | struct spwd getspuid_resultbuf;
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79 | struct spwd getspnam_resultbuf;
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80 | char getspuid_buffer[PWD_BUFFER_SIZE];
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81 | char getspnam_buffer[PWD_BUFFER_SIZE];
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82 | #endif
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83 | // Not converted - too small to bother
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84 | //pthread_mutex_t mylock = PTHREAD_MUTEX_INITIALIZER;
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85 | //FILE *pwf /*= NULL*/;
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86 | //FILE *grf /*= NULL*/;
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87 | //FILE *spf /*= NULL*/;
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88 | #if 0
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89 | struct passwd getpwent_pwd;
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90 | struct group getgrent_gr;
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91 | char getpwent_line_buff[PWD_BUFFER_SIZE];
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92 | char getgrent_line_buff[GRP_BUFFER_SIZE];
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93 | #endif
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94 | #if 0 //ENABLE_USE_BB_SHADOW
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95 | struct spwd getspent_spwd;
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96 | struct spwd sgetspent_spwd;
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97 | char getspent_line_buff[PWD_BUFFER_SIZE];
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98 | char sgetspent_line_buff[PWD_BUFFER_SIZE];
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99 | #endif
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100 | };
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101 |
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102 | static struct statics *ptr_to_statics;
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103 |
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104 | static struct statics *get_S(void)
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105 | {
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106 | if (!ptr_to_statics)
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107 | ptr_to_statics = xzalloc(sizeof(*ptr_to_statics));
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108 | return ptr_to_statics;
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109 | }
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110 |
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111 | /* Always use in this order, get_S() must be called first */
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112 | #define RESULTBUF(name) &((S = get_S())->name##_resultbuf)
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113 | #define BUFFER(name) (S->name##_buffer)
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114 |
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115 | /**********************************************************************/
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116 | /* For the various fget??ent_r funcs, return
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117 | *
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118 | * 0: success
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119 | * ENOENT: end-of-file encountered
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120 | * ERANGE: buflen too small
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121 | * other error values possible. See bb__pgsreader.
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122 | *
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123 | * Also, *result == resultbuf on success and NULL on failure.
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124 | *
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125 | * NOTE: glibc difference - For the ENOENT case, glibc also sets errno.
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126 | * We do not, as it really isn't an error if we reach the end-of-file.
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127 | * Doing so is analogous to having fgetc() set errno on EOF.
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128 | */
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129 | /**********************************************************************/
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130 |
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131 | int fgetpwent_r(FILE *__restrict stream, struct passwd *__restrict resultbuf,
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132 | char *__restrict buffer, size_t buflen,
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133 | struct passwd **__restrict result)
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134 | {
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135 | int rv;
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136 |
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137 | *result = NULL;
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138 |
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139 | rv = bb__pgsreader(bb__parsepwent, resultbuf, buffer, buflen, stream);
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140 | if (!rv) {
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141 | *result = resultbuf;
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142 | }
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143 |
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144 | return rv;
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145 | }
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146 |
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147 | int fgetgrent_r(FILE *__restrict stream, struct group *__restrict resultbuf,
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148 | char *__restrict buffer, size_t buflen,
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149 | struct group **__restrict result)
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150 | {
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151 | int rv;
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152 |
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153 | *result = NULL;
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154 |
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155 | rv = bb__pgsreader(bb__parsegrent, resultbuf, buffer, buflen, stream);
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156 | if (!rv) {
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157 | *result = resultbuf;
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158 | }
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159 |
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160 | return rv;
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161 | }
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162 |
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163 | #if ENABLE_USE_BB_SHADOW
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164 | int fgetspent_r(FILE *__restrict stream, struct spwd *__restrict resultbuf,
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165 | char *__restrict buffer, size_t buflen,
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166 | struct spwd **__restrict result)
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167 | {
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168 | int rv;
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169 |
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170 | *result = NULL;
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171 |
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172 | rv = bb__pgsreader(bb__parsespent, resultbuf, buffer, buflen, stream);
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173 | if (!rv) {
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174 | *result = resultbuf;
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175 | }
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176 |
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177 | return rv;
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178 | }
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179 | #endif
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180 |
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181 | /**********************************************************************/
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182 | /* For the various fget??ent funcs, return NULL on failure and a
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183 | * pointer to the appropriate struct (statically allocated) on success.
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184 | * TODO: audit & stop using these in bbox, they pull in static buffers */
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185 | /**********************************************************************/
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186 |
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187 | #if 0
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188 | struct passwd *fgetpwent(FILE *stream)
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189 | {
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190 | struct statics *S;
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191 | struct passwd *resultbuf = RESULTBUF(fgetpwent);
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192 | char *buffer = BUFFER(fgetpwent);
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193 | struct passwd *result;
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194 |
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195 | fgetpwent_r(stream, resultbuf, buffer, sizeof(BUFFER(fgetpwent)), &result);
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196 | return result;
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197 | }
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198 |
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199 | struct group *fgetgrent(FILE *stream)
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200 | {
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201 | struct statics *S;
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202 | struct group *resultbuf = RESULTBUF(fgetgrent);
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203 | char *buffer = BUFFER(fgetgrent);
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204 | struct group *result;
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205 |
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206 | fgetgrent_r(stream, resultbuf, buffer, sizeof(BUFFER(fgetgrent)), &result);
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207 | return result;
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208 | }
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209 | #endif
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210 |
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211 | #if ENABLE_USE_BB_SHADOW
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212 | #if 0
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213 | struct spwd *fgetspent(FILE *stream)
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214 | {
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215 | struct statics *S;
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216 | struct spwd *resultbuf = RESULTBUF(fgetspent);
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217 | char *buffer = BUFFER(fgetspent);
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218 | struct spwd *result;
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219 |
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220 | fgetspent_r(stream, resultbuf, buffer, sizeof(BUFFER(fgetspent)), &result);
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221 | return result;
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222 | }
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223 | #endif
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224 |
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225 | int sgetspent_r(const char *string, struct spwd *result_buf,
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226 | char *buffer, size_t buflen, struct spwd **result)
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227 | {
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228 | int rv = ERANGE;
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229 |
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230 | *result = NULL;
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231 |
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232 | if (buflen < PWD_BUFFER_SIZE) {
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233 | DO_ERANGE:
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234 | errno=rv;
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235 | goto DONE;
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236 | }
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237 |
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238 | if (string != buffer) {
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239 | if (strlen(string) >= buflen) {
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240 | goto DO_ERANGE;
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241 | }
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242 | strcpy(buffer, string);
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243 | }
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244 |
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245 | rv = bb__parsespent(result_buf, buffer);
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246 | if (!rv) {
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247 | *result = result_buf;
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248 | }
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249 |
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250 | DONE:
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251 | return rv;
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252 | }
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253 | #endif
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254 |
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255 | /**********************************************************************/
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256 |
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257 | #define GETXXKEY_R_FUNC getpwnam_r
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258 | #define GETXXKEY_R_PARSER bb__parsepwent
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259 | #define GETXXKEY_R_ENTTYPE struct passwd
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260 | #define GETXXKEY_R_TEST(ENT) (!strcmp((ENT)->pw_name, key))
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261 | #define GETXXKEY_R_KEYTYPE const char *__restrict
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262 | #define GETXXKEY_R_PATHNAME _PATH_PASSWD
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263 | #include "pwd_grp_internal.c"
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264 |
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265 | #define GETXXKEY_R_FUNC getgrnam_r
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266 | #define GETXXKEY_R_PARSER bb__parsegrent
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267 | #define GETXXKEY_R_ENTTYPE struct group
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268 | #define GETXXKEY_R_TEST(ENT) (!strcmp((ENT)->gr_name, key))
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269 | #define GETXXKEY_R_KEYTYPE const char *__restrict
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270 | #define GETXXKEY_R_PATHNAME _PATH_GROUP
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271 | #include "pwd_grp_internal.c"
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272 |
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273 | #if ENABLE_USE_BB_SHADOW
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274 | #define GETXXKEY_R_FUNC getspnam_r
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275 | #define GETXXKEY_R_PARSER bb__parsespent
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276 | #define GETXXKEY_R_ENTTYPE struct spwd
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277 | #define GETXXKEY_R_TEST(ENT) (!strcmp((ENT)->sp_namp, key))
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278 | #define GETXXKEY_R_KEYTYPE const char *__restrict
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279 | #define GETXXKEY_R_PATHNAME _PATH_SHADOW
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280 | #include "pwd_grp_internal.c"
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281 | #endif
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282 |
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283 | #define GETXXKEY_R_FUNC getpwuid_r
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284 | #define GETXXKEY_R_PARSER bb__parsepwent
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285 | #define GETXXKEY_R_ENTTYPE struct passwd
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286 | #define GETXXKEY_R_TEST(ENT) ((ENT)->pw_uid == key)
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287 | #define GETXXKEY_R_KEYTYPE uid_t
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288 | #define GETXXKEY_R_PATHNAME _PATH_PASSWD
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289 | #include "pwd_grp_internal.c"
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290 |
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291 | #define GETXXKEY_R_FUNC getgrgid_r
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292 | #define GETXXKEY_R_PARSER bb__parsegrent
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293 | #define GETXXKEY_R_ENTTYPE struct group
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294 | #define GETXXKEY_R_TEST(ENT) ((ENT)->gr_gid == key)
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295 | #define GETXXKEY_R_KEYTYPE gid_t
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296 | #define GETXXKEY_R_PATHNAME _PATH_GROUP
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297 | #include "pwd_grp_internal.c"
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298 |
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299 | /**********************************************************************/
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300 | /* TODO: audit & stop using these in bbox, they pull in static buffers */
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301 |
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302 | /* This one has many users */
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303 | struct passwd *getpwuid(uid_t uid)
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304 | {
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305 | struct statics *S;
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306 | struct passwd *resultbuf = RESULTBUF(getpwuid);
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307 | char *buffer = BUFFER(getpwuid);
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308 | struct passwd *result;
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309 |
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310 | getpwuid_r(uid, resultbuf, buffer, sizeof(BUFFER(getpwuid)), &result);
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311 | return result;
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312 | }
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313 |
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314 | /* This one has many users */
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315 | struct group *getgrgid(gid_t gid)
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316 | {
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317 | struct statics *S;
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318 | struct group *resultbuf = RESULTBUF(getgrgid);
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319 | char *buffer = BUFFER(getgrgid);
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320 | struct group *result;
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321 |
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322 | getgrgid_r(gid, resultbuf, buffer, sizeof(BUFFER(getgrgid)), &result);
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323 | return result;
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324 | }
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325 |
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326 | #if 0 //ENABLE_USE_BB_SHADOW
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327 | /* This function is non-standard and is currently not built. It seems
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328 | * to have been created as a reentrant version of the non-standard
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329 | * functions getspuid. Why getspuid was added, I do not know. */
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330 | int getspuid_r(uid_t uid, struct spwd *__restrict resultbuf,
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331 | char *__restrict buffer, size_t buflen,
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332 | struct spwd **__restrict result)
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333 | {
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334 | int rv;
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335 | struct passwd *pp;
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336 | struct passwd password;
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337 | char pwd_buff[PWD_BUFFER_SIZE];
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338 |
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339 | *result = NULL;
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340 | rv = getpwuid_r(uid, &password, pwd_buff, sizeof(pwd_buff), &pp);
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341 | if (!rv) {
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342 | rv = getspnam_r(password.pw_name, resultbuf, buffer, buflen, result);
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343 | }
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344 |
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345 | return rv;
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346 | }
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347 |
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348 | /* This function is non-standard and is currently not built.
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349 | * Why it was added, I do not know. */
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350 | struct spwd *getspuid(uid_t uid)
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351 | {
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352 | struct statics *S;
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353 | struct spwd *resultbuf = RESULTBUF(getspuid);
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354 | char *buffer = BUFFER(getspuid);
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355 | struct spwd *result;
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356 |
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357 | getspuid_r(uid, resultbuf, buffer, sizeof(BUFFER(getspuid)), &result);
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358 | return result;
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359 | }
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360 | #endif
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361 |
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362 | /* This one has many users */
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363 | struct passwd *getpwnam(const char *name)
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364 | {
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365 | struct statics *S;
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366 | struct passwd *resultbuf = RESULTBUF(getpwnam);
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367 | char *buffer = BUFFER(getpwnam);
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368 | struct passwd *result;
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369 |
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370 | getpwnam_r(name, resultbuf, buffer, sizeof(BUFFER(getpwnam)), &result);
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371 | return result;
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372 | }
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373 |
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374 | /* This one has many users */
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375 | struct group *getgrnam(const char *name)
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376 | {
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377 | struct statics *S;
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378 | struct group *resultbuf = RESULTBUF(getgrnam);
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379 | char *buffer = BUFFER(getgrnam);
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380 | struct group *result;
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381 |
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382 | getgrnam_r(name, resultbuf, buffer, sizeof(BUFFER(getgrnam)), &result);
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383 | return result;
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384 | }
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385 |
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386 | #if 0 //ENABLE_USE_BB_SHADOW
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387 | struct spwd *getspnam(const char *name)
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388 | {
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389 | struct statics *S;
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390 | struct spwd *resultbuf = RESULTBUF(getspnam);
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391 | char *buffer = BUFFER(getspnam);
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392 | struct spwd *result;
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393 |
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394 | getspnam_r(name, resultbuf, buffer, sizeof(BUFFER(getspnam)), &result);
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395 | return result;
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396 | }
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397 | #endif
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398 |
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399 | /* This one doesn't use static buffers */
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400 | int getpw(uid_t uid, char *buf)
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401 | {
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402 | struct passwd resultbuf;
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403 | struct passwd *result;
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404 | char buffer[PWD_BUFFER_SIZE];
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405 |
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406 | if (!buf) {
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407 | errno = EINVAL;
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408 | } else if (!getpwuid_r(uid, &resultbuf, buffer, sizeof(buffer), &result)) {
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409 | if (sprintf(buf, "%s:%s:%lu:%lu:%s:%s:%s\n",
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410 | resultbuf.pw_name, resultbuf.pw_passwd,
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411 | (unsigned long)(resultbuf.pw_uid),
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412 | (unsigned long)(resultbuf.pw_gid),
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413 | resultbuf.pw_gecos, resultbuf.pw_dir,
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414 | resultbuf.pw_shell) >= 0
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415 | ) {
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416 | return 0;
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417 | }
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418 | }
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419 |
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420 | return -1;
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421 | }
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422 |
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423 | /**********************************************************************/
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424 |
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425 | /* FIXME: we don't have such CONFIG_xx - ?! */
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426 |
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427 | #if defined CONFIG_USE_BB_THREADSAFE_SHADOW && defined PTHREAD_MUTEX_INITIALIZER
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428 | static pthread_mutex_t mylock = PTHREAD_MUTEX_INITIALIZER;
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429 | # define LOCK pthread_mutex_lock(&mylock)
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430 | # define UNLOCK pthread_mutex_unlock(&mylock);
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431 | #else
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432 | # define LOCK ((void) 0)
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433 | # define UNLOCK ((void) 0)
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434 | #endif
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435 |
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436 | static FILE *pwf /*= NULL*/;
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437 | void setpwent(void)
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438 | {
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439 | LOCK;
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440 | if (pwf) {
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441 | rewind(pwf);
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442 | }
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443 | UNLOCK;
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444 | }
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445 |
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446 | void endpwent(void)
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447 | {
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448 | LOCK;
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449 | if (pwf) {
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450 | fclose(pwf);
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451 | pwf = NULL;
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452 | }
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453 | UNLOCK;
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454 | }
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455 |
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456 |
|
---|
457 | int getpwent_r(struct passwd *__restrict resultbuf,
|
---|
458 | char *__restrict buffer, size_t buflen,
|
---|
459 | struct passwd **__restrict result)
|
---|
460 | {
|
---|
461 | int rv;
|
---|
462 |
|
---|
463 | LOCK;
|
---|
464 | *result = NULL; /* In case of error... */
|
---|
465 |
|
---|
466 | if (!pwf) {
|
---|
467 | pwf = fopen(_PATH_PASSWD, "r");
|
---|
468 | if (!pwf) {
|
---|
469 | rv = errno;
|
---|
470 | goto ERR;
|
---|
471 | }
|
---|
472 | }
|
---|
473 |
|
---|
474 | rv = bb__pgsreader(bb__parsepwent, resultbuf, buffer, buflen, pwf);
|
---|
475 | if (!rv) {
|
---|
476 | *result = resultbuf;
|
---|
477 | }
|
---|
478 |
|
---|
479 | ERR:
|
---|
480 | UNLOCK;
|
---|
481 | return rv;
|
---|
482 | }
|
---|
483 |
|
---|
484 | static FILE *grf /*= NULL*/;
|
---|
485 | void setgrent(void)
|
---|
486 | {
|
---|
487 | LOCK;
|
---|
488 | if (grf) {
|
---|
489 | rewind(grf);
|
---|
490 | }
|
---|
491 | UNLOCK;
|
---|
492 | }
|
---|
493 |
|
---|
494 | void endgrent(void)
|
---|
495 | {
|
---|
496 | LOCK;
|
---|
497 | if (grf) {
|
---|
498 | fclose(grf);
|
---|
499 | grf = NULL;
|
---|
500 | }
|
---|
501 | UNLOCK;
|
---|
502 | }
|
---|
503 |
|
---|
504 | int getgrent_r(struct group *__restrict resultbuf,
|
---|
505 | char *__restrict buffer, size_t buflen,
|
---|
506 | struct group **__restrict result)
|
---|
507 | {
|
---|
508 | int rv;
|
---|
509 |
|
---|
510 | LOCK;
|
---|
511 | *result = NULL; /* In case of error... */
|
---|
512 |
|
---|
513 | if (!grf) {
|
---|
514 | grf = fopen(_PATH_GROUP, "r");
|
---|
515 | if (!grf) {
|
---|
516 | rv = errno;
|
---|
517 | goto ERR;
|
---|
518 | }
|
---|
519 | }
|
---|
520 |
|
---|
521 | rv = bb__pgsreader(bb__parsegrent, resultbuf, buffer, buflen, grf);
|
---|
522 | if (!rv) {
|
---|
523 | *result = resultbuf;
|
---|
524 | }
|
---|
525 |
|
---|
526 | ERR:
|
---|
527 | UNLOCK;
|
---|
528 | return rv;
|
---|
529 | }
|
---|
530 |
|
---|
531 | #if ENABLE_USE_BB_SHADOW
|
---|
532 | static FILE *spf /*= NULL*/;
|
---|
533 | void setspent(void)
|
---|
534 | {
|
---|
535 | LOCK;
|
---|
536 | if (spf) {
|
---|
537 | rewind(spf);
|
---|
538 | }
|
---|
539 | UNLOCK;
|
---|
540 | }
|
---|
541 |
|
---|
542 | void endspent(void)
|
---|
543 | {
|
---|
544 | LOCK;
|
---|
545 | if (spf) {
|
---|
546 | fclose(spf);
|
---|
547 | spf = NULL;
|
---|
548 | }
|
---|
549 | UNLOCK;
|
---|
550 | }
|
---|
551 |
|
---|
552 | int getspent_r(struct spwd *resultbuf, char *buffer,
|
---|
553 | size_t buflen, struct spwd **result)
|
---|
554 | {
|
---|
555 | int rv;
|
---|
556 |
|
---|
557 | LOCK;
|
---|
558 | *result = NULL; /* In case of error... */
|
---|
559 |
|
---|
560 | if (!spf) {
|
---|
561 | spf = fopen(_PATH_SHADOW, "r");
|
---|
562 | if (!spf) {
|
---|
563 | rv = errno;
|
---|
564 | goto ERR;
|
---|
565 | }
|
---|
566 | }
|
---|
567 |
|
---|
568 | rv = bb__pgsreader(bb__parsespent, resultbuf, buffer, buflen, spf);
|
---|
569 | if (!rv) {
|
---|
570 | *result = resultbuf;
|
---|
571 | }
|
---|
572 |
|
---|
573 | ERR:
|
---|
574 | UNLOCK;
|
---|
575 | return rv;
|
---|
576 | }
|
---|
577 | #endif
|
---|
578 |
|
---|
579 | #if 0
|
---|
580 | struct passwd *getpwent(void)
|
---|
581 | {
|
---|
582 | static char line_buff[PWD_BUFFER_SIZE];
|
---|
583 | static struct passwd pwd;
|
---|
584 | struct passwd *result;
|
---|
585 |
|
---|
586 | getpwent_r(&pwd, line_buff, sizeof(line_buff), &result);
|
---|
587 | return result;
|
---|
588 | }
|
---|
589 |
|
---|
590 | struct group *getgrent(void)
|
---|
591 | {
|
---|
592 | static char line_buff[GRP_BUFFER_SIZE];
|
---|
593 | static struct group gr;
|
---|
594 | struct group *result;
|
---|
595 |
|
---|
596 | getgrent_r(&gr, line_buff, sizeof(line_buff), &result);
|
---|
597 | return result;
|
---|
598 | }
|
---|
599 | #endif
|
---|
600 |
|
---|
601 | #if 0 //ENABLE_USE_BB_SHADOW
|
---|
602 | struct spwd *getspent(void)
|
---|
603 | {
|
---|
604 | static char line_buff[PWD_BUFFER_SIZE];
|
---|
605 | static struct spwd spwd;
|
---|
606 | struct spwd *result;
|
---|
607 |
|
---|
608 | getspent_r(&spwd, line_buff, sizeof(line_buff), &result);
|
---|
609 | return result;
|
---|
610 | }
|
---|
611 |
|
---|
612 | struct spwd *sgetspent(const char *string)
|
---|
613 | {
|
---|
614 | static char line_buff[PWD_BUFFER_SIZE];
|
---|
615 | static struct spwd spwd;
|
---|
616 | struct spwd *result;
|
---|
617 |
|
---|
618 | sgetspent_r(string, &spwd, line_buff, sizeof(line_buff), &result);
|
---|
619 | return result;
|
---|
620 | }
|
---|
621 | #endif
|
---|
622 |
|
---|
623 | int initgroups(const char *user, gid_t gid)
|
---|
624 | {
|
---|
625 | FILE *grfile;
|
---|
626 | gid_t *group_list;
|
---|
627 | int num_groups, rv;
|
---|
628 | char **m;
|
---|
629 | struct group group;
|
---|
630 | char buff[PWD_BUFFER_SIZE];
|
---|
631 |
|
---|
632 | rv = -1;
|
---|
633 |
|
---|
634 | /* We alloc space for 8 gids at a time. */
|
---|
635 | group_list = (gid_t *) malloc(8*sizeof(gid_t *));
|
---|
636 | if (group_list
|
---|
637 | && ((grfile = fopen(_PATH_GROUP, "r")) != NULL)
|
---|
638 | ) {
|
---|
639 | *group_list = gid;
|
---|
640 | num_groups = 1;
|
---|
641 |
|
---|
642 | while (!bb__pgsreader(bb__parsegrent, &group, buff, sizeof(buff), grfile)) {
|
---|
643 | assert(group.gr_mem); /* Must have at least a NULL terminator. */
|
---|
644 | if (group.gr_gid != gid) {
|
---|
645 | for (m = group.gr_mem; *m; m++) {
|
---|
646 | if (!strcmp(*m, user)) {
|
---|
647 | if (!(num_groups & 7)) {
|
---|
648 | gid_t *tmp = (gid_t *)
|
---|
649 | realloc(group_list,
|
---|
650 | (num_groups+8) * sizeof(gid_t *));
|
---|
651 | if (!tmp) {
|
---|
652 | rv = -1;
|
---|
653 | goto DO_CLOSE;
|
---|
654 | }
|
---|
655 | group_list = tmp;
|
---|
656 | }
|
---|
657 | group_list[num_groups++] = group.gr_gid;
|
---|
658 | break;
|
---|
659 | }
|
---|
660 | }
|
---|
661 | }
|
---|
662 | }
|
---|
663 |
|
---|
664 | rv = setgroups(num_groups, group_list);
|
---|
665 | DO_CLOSE:
|
---|
666 | fclose(grfile);
|
---|
667 | }
|
---|
668 |
|
---|
669 | /* group_list will be NULL if initial malloc failed, which may trigger
|
---|
670 | * warnings from various malloc debuggers. */
|
---|
671 | free(group_list);
|
---|
672 | return rv;
|
---|
673 | }
|
---|
674 |
|
---|
675 | int putpwent(const struct passwd *__restrict p, FILE *__restrict f)
|
---|
676 | {
|
---|
677 | int rv = -1;
|
---|
678 |
|
---|
679 | if (!p || !f) {
|
---|
680 | errno=EINVAL;
|
---|
681 | } else {
|
---|
682 | /* No extra thread locking is needed above what fprintf does. */
|
---|
683 | if (fprintf(f, "%s:%s:%lu:%lu:%s:%s:%s\n",
|
---|
684 | p->pw_name, p->pw_passwd,
|
---|
685 | (unsigned long)(p->pw_uid),
|
---|
686 | (unsigned long)(p->pw_gid),
|
---|
687 | p->pw_gecos, p->pw_dir, p->pw_shell) >= 0
|
---|
688 | ) {
|
---|
689 | rv = 0;
|
---|
690 | }
|
---|
691 | }
|
---|
692 |
|
---|
693 | return rv;
|
---|
694 | }
|
---|
695 |
|
---|
696 | int putgrent(const struct group *__restrict p, FILE *__restrict f)
|
---|
697 | {
|
---|
698 | static const char format[] ALIGN1 = ",%s";
|
---|
699 |
|
---|
700 | char **m;
|
---|
701 | const char *fmt;
|
---|
702 | int rv = -1;
|
---|
703 |
|
---|
704 | if (!p || !f) { /* Sigh... glibc checks. */
|
---|
705 | errno=EINVAL;
|
---|
706 | } else {
|
---|
707 | if (fprintf(f, "%s:%s:%lu:",
|
---|
708 | p->gr_name, p->gr_passwd,
|
---|
709 | (unsigned long)(p->gr_gid)) >= 0
|
---|
710 | ) {
|
---|
711 |
|
---|
712 | fmt = format + 1;
|
---|
713 |
|
---|
714 | assert(p->gr_mem);
|
---|
715 | m = p->gr_mem;
|
---|
716 |
|
---|
717 | do {
|
---|
718 | if (!*m) {
|
---|
719 | if (fputc('\n', f) >= 0) {
|
---|
720 | rv = 0;
|
---|
721 | }
|
---|
722 | break;
|
---|
723 | }
|
---|
724 | if (fprintf(f, fmt, *m) < 0) {
|
---|
725 | break;
|
---|
726 | }
|
---|
727 | ++m;
|
---|
728 | fmt = format;
|
---|
729 | } while (1);
|
---|
730 |
|
---|
731 | }
|
---|
732 |
|
---|
733 | }
|
---|
734 |
|
---|
735 | return rv;
|
---|
736 | }
|
---|
737 |
|
---|
738 | #if ENABLE_USE_BB_SHADOW
|
---|
739 | static const unsigned char _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 | static const char ld_format[] ALIGN1 = "%ld:";
|
---|
751 |
|
---|
752 | const char *f;
|
---|
753 | long x;
|
---|
754 | int i;
|
---|
755 | int rv = -1;
|
---|
756 |
|
---|
757 | /* Unlike putpwent and putgrent, glibc does not check the args. */
|
---|
758 | if (fprintf(stream, "%s:%s:", p->sp_namp,
|
---|
759 | (p->sp_pwdp ? p->sp_pwdp : "")) < 0
|
---|
760 | ) {
|
---|
761 | goto DO_UNLOCK;
|
---|
762 | }
|
---|
763 |
|
---|
764 | for (i = 0; i < sizeof(_sp_off); i++) {
|
---|
765 | f = ld_format;
|
---|
766 | x = *(const long *)(((const char *) p) + _sp_off[i]);
|
---|
767 | if (x == -1) {
|
---|
768 | f += 3;
|
---|
769 | }
|
---|
770 | if (fprintf(stream, f, x) < 0) {
|
---|
771 | goto DO_UNLOCK;
|
---|
772 | }
|
---|
773 | }
|
---|
774 |
|
---|
775 | if ((p->sp_flag != ~0UL) && (fprintf(stream, "%lu", p->sp_flag) < 0)) {
|
---|
776 | goto DO_UNLOCK;
|
---|
777 | }
|
---|
778 |
|
---|
779 | if (fputc('\n', stream) > 0) {
|
---|
780 | rv = 0;
|
---|
781 | }
|
---|
782 |
|
---|
783 | DO_UNLOCK:
|
---|
784 | return rv;
|
---|
785 | }
|
---|
786 | #endif
|
---|
787 |
|
---|
788 | /**********************************************************************/
|
---|
789 | /* Internal uClibc functions. */
|
---|
790 | /**********************************************************************/
|
---|
791 |
|
---|
792 | static const unsigned char pw_off[] ALIGN1 = {
|
---|
793 | offsetof(struct passwd, pw_name), /* 0 */
|
---|
794 | offsetof(struct passwd, pw_passwd), /* 1 */
|
---|
795 | offsetof(struct passwd, pw_uid), /* 2 - not a char ptr */
|
---|
796 | offsetof(struct passwd, pw_gid), /* 3 - not a char ptr */
|
---|
797 | offsetof(struct passwd, pw_gecos), /* 4 */
|
---|
798 | offsetof(struct passwd, pw_dir), /* 5 */
|
---|
799 | offsetof(struct passwd, pw_shell) /* 6 */
|
---|
800 | };
|
---|
801 |
|
---|
802 | static int bb__parsepwent(void *data, char *line)
|
---|
803 | {
|
---|
804 | char *endptr;
|
---|
805 | char *p;
|
---|
806 | int i;
|
---|
807 |
|
---|
808 | i = 0;
|
---|
809 | do {
|
---|
810 | p = ((char *) ((struct passwd *) data)) + pw_off[i];
|
---|
811 |
|
---|
812 | if ((i & 6) ^ 2) { /* i!=2 and i!=3 */
|
---|
813 | *((char **) p) = line;
|
---|
814 | if (i==6) {
|
---|
815 | return 0;
|
---|
816 | }
|
---|
817 | /* NOTE: glibc difference - glibc allows omission of
|
---|
818 | * ':' seperators after the gid field if all remaining
|
---|
819 | * entries are empty. We require all separators. */
|
---|
820 | line = strchr(line, ':');
|
---|
821 | if (!line) {
|
---|
822 | break;
|
---|
823 | }
|
---|
824 | } else {
|
---|
825 | unsigned long t = strtoul(line, &endptr, 10);
|
---|
826 | /* Make sure we had at least one digit, and that the
|
---|
827 | * failing char is the next field seperator ':'. See
|
---|
828 | * glibc difference note above. */
|
---|
829 | /* TODO: Also check for leading whitespace? */
|
---|
830 | if ((endptr == line) || (*endptr != ':')) {
|
---|
831 | break;
|
---|
832 | }
|
---|
833 | line = endptr;
|
---|
834 | if (i & 1) { /* i == 3 -- gid */
|
---|
835 | *((gid_t *) p) = t;
|
---|
836 | } else { /* i == 2 -- uid */
|
---|
837 | *((uid_t *) p) = t;
|
---|
838 | }
|
---|
839 | }
|
---|
840 |
|
---|
841 | *line++ = 0;
|
---|
842 | ++i;
|
---|
843 | } while (1);
|
---|
844 |
|
---|
845 | return -1;
|
---|
846 | }
|
---|
847 |
|
---|
848 | /**********************************************************************/
|
---|
849 |
|
---|
850 | static const unsigned char gr_off[] ALIGN1 = {
|
---|
851 | offsetof(struct group, gr_name), /* 0 */
|
---|
852 | offsetof(struct group, gr_passwd), /* 1 */
|
---|
853 | offsetof(struct group, gr_gid) /* 2 - not a char ptr */
|
---|
854 | };
|
---|
855 |
|
---|
856 | static int bb__parsegrent(void *data, char *line)
|
---|
857 | {
|
---|
858 | char *endptr;
|
---|
859 | char *p;
|
---|
860 | int i;
|
---|
861 | char **members;
|
---|
862 | char *end_of_buf;
|
---|
863 |
|
---|
864 | end_of_buf = ((struct group *) data)->gr_name; /* Evil hack! */
|
---|
865 | i = 0;
|
---|
866 | do {
|
---|
867 | p = ((char *) ((struct group *) data)) + gr_off[i];
|
---|
868 |
|
---|
869 | if (i < 2) {
|
---|
870 | *((char **) p) = line;
|
---|
871 | line = strchr(line, ':');
|
---|
872 | if (!line) {
|
---|
873 | break;
|
---|
874 | }
|
---|
875 | *line++ = 0;
|
---|
876 | ++i;
|
---|
877 | } else {
|
---|
878 | *((gid_t *) p) = strtoul(line, &endptr, 10);
|
---|
879 |
|
---|
880 | /* NOTE: glibc difference - glibc allows omission of the
|
---|
881 | * trailing colon when there is no member list. We treat
|
---|
882 | * this as an error. */
|
---|
883 |
|
---|
884 | /* Make sure we had at least one digit, and that the
|
---|
885 | * failing char is the next field seperator ':'. See
|
---|
886 | * glibc difference note above. */
|
---|
887 | if ((endptr == line) || (*endptr != ':')) {
|
---|
888 | break;
|
---|
889 | }
|
---|
890 |
|
---|
891 | i = 1; /* Count terminating NULL ptr. */
|
---|
892 | p = endptr;
|
---|
893 |
|
---|
894 | if (p[1]) { /* We have a member list to process. */
|
---|
895 | /* Overwrite the last ':' with a ',' before counting.
|
---|
896 | * This allows us to test for initial ',' and adds
|
---|
897 | * one ',' so that the ',' count equals the member
|
---|
898 | * count. */
|
---|
899 | *p = ',';
|
---|
900 | do {
|
---|
901 | /* NOTE: glibc difference - glibc allows and trims leading
|
---|
902 | * (but not trailing) space. We treat this as an error. */
|
---|
903 | /* NOTE: glibc difference - glibc allows consecutive and
|
---|
904 | * trailing commas, and ignores "empty string" users. We
|
---|
905 | * treat this as an error. */
|
---|
906 | if (*p == ',') {
|
---|
907 | ++i;
|
---|
908 | *p = 0; /* nul-terminate each member string. */
|
---|
909 | if (!*++p || (*p == ',') || isspace(*p)) {
|
---|
910 | goto ERR;
|
---|
911 | }
|
---|
912 | }
|
---|
913 | } while (*++p);
|
---|
914 | }
|
---|
915 |
|
---|
916 | /* Now align (p+1), rounding up. */
|
---|
917 | /* Assumes sizeof(char **) is a power of 2. */
|
---|
918 | members = (char **)( (((intptr_t) p) + sizeof(char **))
|
---|
919 | & ~((intptr_t)(sizeof(char **) - 1)) );
|
---|
920 |
|
---|
921 | if (((char *)(members + i)) > end_of_buf) { /* No space. */
|
---|
922 | break;
|
---|
923 | }
|
---|
924 |
|
---|
925 | ((struct group *) data)->gr_mem = members;
|
---|
926 |
|
---|
927 | if (--i) {
|
---|
928 | p = endptr; /* Pointing to char prior to first member. */
|
---|
929 | do {
|
---|
930 | *members++ = ++p;
|
---|
931 | if (!--i) break;
|
---|
932 | while (*++p) {}
|
---|
933 | } while (1);
|
---|
934 | }
|
---|
935 | *members = NULL;
|
---|
936 |
|
---|
937 | return 0;
|
---|
938 | }
|
---|
939 | } while (1);
|
---|
940 |
|
---|
941 | ERR:
|
---|
942 | return -1;
|
---|
943 | }
|
---|
944 |
|
---|
945 | /**********************************************************************/
|
---|
946 |
|
---|
947 | #if ENABLE_USE_BB_SHADOW
|
---|
948 | static const unsigned char sp_off[] ALIGN1 = {
|
---|
949 | offsetof(struct spwd, sp_namp), /* 0 */
|
---|
950 | offsetof(struct spwd, sp_pwdp), /* 1 */
|
---|
951 | offsetof(struct spwd, sp_lstchg), /* 2 - not a char ptr */
|
---|
952 | offsetof(struct spwd, sp_min), /* 3 - not a char ptr */
|
---|
953 | offsetof(struct spwd, sp_max), /* 4 - not a char ptr */
|
---|
954 | offsetof(struct spwd, sp_warn), /* 5 - not a char ptr */
|
---|
955 | offsetof(struct spwd, sp_inact), /* 6 - not a char ptr */
|
---|
956 | offsetof(struct spwd, sp_expire), /* 7 - not a char ptr */
|
---|
957 | offsetof(struct spwd, sp_flag) /* 8 - not a char ptr */
|
---|
958 | };
|
---|
959 |
|
---|
960 | static int bb__parsespent(void *data, char * line)
|
---|
961 | {
|
---|
962 | char *endptr;
|
---|
963 | char *p;
|
---|
964 | int i;
|
---|
965 |
|
---|
966 | i = 0;
|
---|
967 | do {
|
---|
968 | p = ((char *) ((struct spwd *) data)) + sp_off[i];
|
---|
969 | if (i < 2) {
|
---|
970 | *((char **) p) = line;
|
---|
971 | line = strchr(line, ':');
|
---|
972 | if (!line) {
|
---|
973 | break;
|
---|
974 | }
|
---|
975 | } else {
|
---|
976 | *((long *) p) = (long) strtoul(line, &endptr, 10);
|
---|
977 |
|
---|
978 | if (endptr == line) {
|
---|
979 | *((long *) p) = ((i != 8) ? -1L : ((long)(~0UL)));
|
---|
980 | }
|
---|
981 |
|
---|
982 | line = endptr;
|
---|
983 |
|
---|
984 | if (i == 8) {
|
---|
985 | if (!*endptr) {
|
---|
986 | return 0;
|
---|
987 | }
|
---|
988 | break;
|
---|
989 | }
|
---|
990 |
|
---|
991 | if (*endptr != ':') {
|
---|
992 | break;
|
---|
993 | }
|
---|
994 |
|
---|
995 | }
|
---|
996 |
|
---|
997 | *line++ = 0;
|
---|
998 | ++i;
|
---|
999 | } while (1);
|
---|
1000 |
|
---|
1001 | return EINVAL;
|
---|
1002 | }
|
---|
1003 | #endif
|
---|
1004 |
|
---|
1005 | /**********************************************************************/
|
---|
1006 |
|
---|
1007 | /* Reads until if EOF, or until if finds a line which fits in the buffer
|
---|
1008 | * and for which the parser function succeeds.
|
---|
1009 | *
|
---|
1010 | * Returns 0 on success and ENOENT for end-of-file (glibc concession).
|
---|
1011 | */
|
---|
1012 |
|
---|
1013 | static int bb__pgsreader(int (*parserfunc)(void *d, char *line), void *data,
|
---|
1014 | char *__restrict line_buff, size_t buflen, FILE *f)
|
---|
1015 | {
|
---|
1016 | int line_len;
|
---|
1017 | int skip;
|
---|
1018 | int rv = ERANGE;
|
---|
1019 |
|
---|
1020 | if (buflen < PWD_BUFFER_SIZE) {
|
---|
1021 | errno = rv;
|
---|
1022 | } else {
|
---|
1023 | skip = 0;
|
---|
1024 | do {
|
---|
1025 | if (!fgets(line_buff, buflen, f)) {
|
---|
1026 | if (feof(f)) {
|
---|
1027 | rv = ENOENT;
|
---|
1028 | }
|
---|
1029 | break;
|
---|
1030 | }
|
---|
1031 |
|
---|
1032 | line_len = strlen(line_buff) - 1; /* strlen() must be > 0. */
|
---|
1033 | if (line_buff[line_len] == '\n') {
|
---|
1034 | line_buff[line_len] = 0;
|
---|
1035 | } else if (line_len + 2 == buflen) { /* line too long */
|
---|
1036 | ++skip;
|
---|
1037 | continue;
|
---|
1038 | }
|
---|
1039 |
|
---|
1040 | if (skip) {
|
---|
1041 | --skip;
|
---|
1042 | continue;
|
---|
1043 | }
|
---|
1044 |
|
---|
1045 | /* NOTE: glibc difference - glibc strips leading whitespace from
|
---|
1046 | * records. We do not allow leading whitespace. */
|
---|
1047 |
|
---|
1048 | /* Skip empty lines, comment lines, and lines with leading
|
---|
1049 | * whitespace. */
|
---|
1050 | if (*line_buff && (*line_buff != '#') && !isspace(*line_buff)) {
|
---|
1051 | if (parserfunc == bb__parsegrent) { /* Do evil group hack. */
|
---|
1052 | /* The group entry parsing function needs to know where
|
---|
1053 | * the end of the buffer is so that it can construct the
|
---|
1054 | * group member ptr table. */
|
---|
1055 | ((struct group *) data)->gr_name = line_buff + buflen;
|
---|
1056 | }
|
---|
1057 |
|
---|
1058 | if (!parserfunc(data, line_buff)) {
|
---|
1059 | rv = 0;
|
---|
1060 | break;
|
---|
1061 | }
|
---|
1062 | }
|
---|
1063 | } while (1);
|
---|
1064 |
|
---|
1065 | }
|
---|
1066 |
|
---|
1067 | return rv;
|
---|
1068 | }
|
---|