1 | #include <pthread.h>
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2 | #include <byteswap.h>
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3 | #include <string.h>
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4 | #include <unistd.h>
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5 | #include "pwf.h"
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6 | #include "nscd.h"
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7 |
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8 | static char *itoa(char *p, uint32_t x)
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9 | {
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10 | // number of digits in a uint32_t + NUL
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11 | p += 11;
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12 | *--p = 0;
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13 | do {
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14 | *--p = '0' + x % 10;
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15 | x /= 10;
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16 | } while (x);
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17 | return p;
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18 | }
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19 |
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20 | int __getgr_a(const char *name, gid_t gid, struct group *gr, char **buf, size_t *size, char ***mem, size_t *nmem, struct group **res)
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21 | {
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22 | FILE *f;
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23 | int rv = 0;
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24 | int cs;
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25 |
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26 | *res = 0;
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27 |
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28 | pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &cs);
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29 | f = fopen("/etc/group", "rbe");
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30 | if (!f) {
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31 | rv = errno;
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32 | goto done;
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33 | }
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34 |
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35 | while (!(rv = __getgrent_a(f, gr, buf, size, mem, nmem, res)) && *res) {
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36 | if (name && !strcmp(name, (*res)->gr_name)
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37 | || !name && (*res)->gr_gid == gid) {
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38 | break;
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39 | }
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40 | }
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41 | fclose(f);
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42 |
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43 | if (!*res && (rv == 0 || rv == ENOENT || rv == ENOTDIR)) {
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44 | int32_t req = name ? GETGRBYNAME : GETGRBYGID;
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45 | int32_t i;
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46 | const char *key;
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47 | int32_t groupbuf[GR_LEN] = {0};
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48 | size_t len = 0;
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49 | size_t grlist_len = 0;
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50 | char gidbuf[11] = {0};
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51 | int swap = 0;
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52 | char *ptr;
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53 |
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54 | if (name) {
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55 | key = name;
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56 | } else {
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57 | if (gid < 0 || gid > UINT32_MAX) {
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58 | rv = 0;
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59 | goto done;
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60 | }
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61 | key = itoa(gidbuf, gid);
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62 | }
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63 |
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64 | f = __nscd_query(req, key, groupbuf, sizeof groupbuf, &swap);
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65 | if (!f) { rv = errno; goto done; }
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66 |
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67 | if (!groupbuf[GRFOUND]) { rv = 0; goto cleanup_f; }
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68 |
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69 | if (!groupbuf[GRNAMELEN] || !groupbuf[GRPASSWDLEN]) {
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70 | rv = EIO;
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71 | goto cleanup_f;
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72 | }
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73 |
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74 | if (groupbuf[GRNAMELEN] > SIZE_MAX - groupbuf[GRPASSWDLEN]) {
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75 | rv = ENOMEM;
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76 | goto cleanup_f;
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77 | }
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78 | len = groupbuf[GRNAMELEN] + groupbuf[GRPASSWDLEN];
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79 |
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80 | for (i = 0; i < groupbuf[GRMEMCNT]; i++) {
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81 | uint32_t name_len;
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82 | if (fread(&name_len, sizeof name_len, 1, f) < 1) {
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83 | rv = ferror(f) ? errno : EIO;
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84 | goto cleanup_f;
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85 | }
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86 | if (swap) {
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87 | name_len = bswap_32(name_len);
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88 | }
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89 | if (name_len > SIZE_MAX - grlist_len
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90 | || name_len > SIZE_MAX - len) {
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91 | rv = ENOMEM;
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92 | goto cleanup_f;
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93 | }
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94 | len += name_len;
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95 | grlist_len += name_len;
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96 | }
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97 |
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98 | if (len > *size || !*buf) {
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99 | char *tmp = realloc(*buf, len);
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100 | if (!tmp) {
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101 | rv = errno;
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102 | goto cleanup_f;
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103 | }
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104 | *buf = tmp;
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105 | *size = len;
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106 | }
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107 |
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108 | if (!fread(*buf, len, 1, f)) {
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109 | rv = ferror(f) ? errno : EIO;
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110 | goto cleanup_f;
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111 | }
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112 |
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113 | if (groupbuf[GRMEMCNT] + 1 > *nmem) {
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114 | if (groupbuf[GRMEMCNT] + 1 > SIZE_MAX/sizeof(char*)) {
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115 | rv = ENOMEM;
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116 | goto cleanup_f;
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117 | }
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118 | char **tmp = realloc(*mem, (groupbuf[GRMEMCNT]+1)*sizeof(char*));
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119 | if (!tmp) {
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120 | rv = errno;
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121 | goto cleanup_f;
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122 | }
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123 | *mem = tmp;
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124 | *nmem = groupbuf[GRMEMCNT] + 1;
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125 | }
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126 |
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127 | if (groupbuf[GRMEMCNT]) {
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128 | mem[0][0] = *buf + groupbuf[GRNAMELEN] + groupbuf[GRPASSWDLEN];
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129 | for (ptr = mem[0][0], i = 0; ptr != mem[0][0]+grlist_len; ptr++)
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130 | if (!*ptr) mem[0][++i] = ptr+1;
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131 | mem[0][i] = 0;
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132 |
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133 | if (i != groupbuf[GRMEMCNT]) {
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134 | rv = EIO;
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135 | goto cleanup_f;
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136 | }
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137 | } else {
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138 | mem[0][0] = 0;
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139 | }
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140 |
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141 | gr->gr_name = *buf;
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142 | gr->gr_passwd = gr->gr_name + groupbuf[GRNAMELEN];
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143 | gr->gr_gid = groupbuf[GRGID];
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144 | gr->gr_mem = *mem;
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145 |
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146 | if (gr->gr_passwd[-1]
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147 | || gr->gr_passwd[groupbuf[GRPASSWDLEN]-1]) {
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148 | rv = EIO;
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149 | goto cleanup_f;
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150 | }
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151 |
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152 | if (name && strcmp(name, gr->gr_name)
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153 | || !name && gid != gr->gr_gid) {
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154 | rv = EIO;
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155 | goto cleanup_f;
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156 | }
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157 |
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158 | *res = gr;
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159 |
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160 | cleanup_f:
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161 | fclose(f);
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162 | goto done;
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163 | }
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164 |
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165 | done:
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166 | pthread_setcancelstate(cs, 0);
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167 | if (rv) errno = rv;
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168 | return rv;
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169 | }
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