| 1 | /* |
| 2 | ** Copyright 2000-2015 Double Precision, Inc. See COPYING for |
| 3 | ** distribution information. |
| 4 | */ |
| 5 | |
| 6 | #include "auth.h" |
| 7 | #include "courierauthstaticlist.h" |
| 8 | #include "courierauthsasl.h" |
| 9 | #include "authwait.h" |
| 10 | #include "courierauthdebug.h" |
| 11 | #include <stdlib.h> |
| 12 | #include <stdio.h> |
| 13 | #include <string.h> |
| 14 | #include <signal.h> |
| 15 | #include <unistd.h> |
| 16 | #include <errno.h> |
| 17 | #include <sys/time.h> |
| 18 | #include <sys/select.h> |
| 19 | #include "numlib/numlib.h" |
| 20 | #include <sys/stat.h> |
| 21 | #include <pwd.h> |
| 22 | #include <sys/types.h> |
| 23 | #include <dirent.h> |
| 24 | |
| 25 | extern int authdaemondo(const char *authreq, |
| 26 | int (*func)(struct authinfo *, void *), void *arg); |
| 27 | |
| 28 | extern void auth_daemon_enumerate( void(*cb_func)(const char *name, |
| 29 | uid_t uid, |
| 30 | gid_t gid, |
| 31 | const char *homedir, |
| 32 | const char *maildir, |
| 33 | const char *options, |
| 34 | void *void_arg), |
| 35 | void *void_arg); |
| 36 | |
| 37 | |
| 38 | int auth_generic(const char *service, |
| 39 | const char *authtype, |
| 40 | char *authdata, |
| 41 | int (*callback_func)(struct authinfo *, void *), |
| 42 | void *callback_arg) |
| 43 | { |
| 44 | char tbuf[NUMBUFSIZE]; |
| 45 | size_t l=strlen(service)+strlen(authtype)+strlen(authdata)+2; |
| 46 | char *n=libmail_str_size_t(l, tbuf); |
| 47 | char *buf=malloc(strlen(n)+l+20); |
| 48 | int rc; |
| 49 | |
| 50 | courier_authdebug_login_init(); |
| 51 | |
| 52 | if (!buf) |
| 53 | return 1; |
| 54 | |
| 55 | strcat(strcat(strcpy(buf, "AUTH "), n), "\n"); |
| 56 | strcat(strcat(buf, service), "\n"); |
| 57 | strcat(strcat(buf, authtype), "\n"); |
| 58 | strcat(buf, authdata); |
| 59 | |
| 60 | rc=strcmp(authtype, "EXTERNAL") == 0 |
| 61 | ? auth_getuserinfo(service, authdata, callback_func, |
| 62 | callback_arg) |
| 63 | : authdaemondo(buf, callback_func, callback_arg); |
| 64 | free(buf); |
| 65 | |
| 66 | if (courier_authdebug_login_level) |
| 67 | { |
| 68 | struct timeval t; |
| 69 | |
| 70 | /* short delay to try and allow authdaemond's courierlogger |
| 71 | to finish writing; otherwise items can appear out of order */ |
| 72 | t.tv_sec = 0; |
| 73 | t.tv_usec = 100000; |
| 74 | select(0, 0, 0, 0, &t); |
| 75 | } |
| 76 | |
| 77 | return rc; |
| 78 | } |
| 79 | |
| 80 | int auth_callback_default(struct authinfo *ainfo) |
| 81 | { |
| 82 | if (ainfo->address == NULL) |
| 83 | { |
| 84 | fprintf(stderr, "WARN: No address!!\n"); |
| 85 | return (-1); |
| 86 | } |
| 87 | |
| 88 | if (ainfo->sysusername) |
| 89 | libmail_changeusername(ainfo->sysusername, |
| 90 | &ainfo->sysgroupid); |
| 91 | else if (ainfo->sysuserid) |
| 92 | libmail_changeuidgid(*ainfo->sysuserid, |
| 93 | ainfo->sysgroupid); |
| 94 | else |
| 95 | { |
| 96 | fprintf(stderr, "WARN: %s: No UID/GID!!\n", ainfo->address); |
| 97 | return (-1); |
| 98 | } |
| 99 | |
| 100 | if (!ainfo->homedir) |
| 101 | { |
| 102 | errno=EINVAL; |
| 103 | fprintf(stderr, "WARN: %s: No homedir!!\n", ainfo->address); |
| 104 | return (1); |
| 105 | } |
| 106 | |
| 107 | if (chdir(ainfo->homedir)) |
| 108 | { |
| 109 | fprintf(stderr, "WARN: %s: chdir(%s) failed!!\n", |
| 110 | ainfo->address, ainfo->homedir); |
| 111 | perror("WARN: error"); |
| 112 | return (1); |
| 113 | } |
| 114 | |
| 115 | return 0; |
| 116 | } |
| 117 | |
| 118 | static void do_copy(const char *from, |
| 119 | const char *to, |
| 120 | struct stat *stat_buf, |
| 121 | uid_t uid, |
| 122 | gid_t gid) |
| 123 | { |
| 124 | FILE *fp=fopen(from, "r"); |
| 125 | FILE *fp2; |
| 126 | int c; |
| 127 | |
| 128 | if (!fp) |
| 129 | { |
| 130 | fprintf(stderr, "WARN: %s: %s!!\n", from, strerror(errno)); |
| 131 | return; |
| 132 | } |
| 133 | |
| 134 | fp2=fopen(to, "w"); |
| 135 | |
| 136 | if (!fp2) |
| 137 | { |
| 138 | fprintf(stderr, "WARN: %s: %s!!\n", to, strerror(errno)); |
| 139 | fclose(fp); |
| 140 | return; |
| 141 | } |
| 142 | |
| 143 | while ((c=getc(fp)) != EOF) |
| 144 | putc(c, fp2); |
| 145 | fclose(fp); |
| 146 | fclose(fp2); |
| 147 | |
| 148 | if (chmod(to, stat_buf->st_mode & ~S_IFMT) || |
| 149 | chown(to, uid, gid) < 0) |
| 150 | { |
| 151 | fprintf(stderr, "WARN: %s: %s!!\n", to, strerror(errno)); |
| 152 | } |
| 153 | } |
| 154 | |
| 155 | static void do_symlink(const char *from, |
| 156 | const char *to, |
| 157 | uid_t uid, |
| 158 | gid_t gid) |
| 159 | { |
| 160 | char buf[1024]; |
| 161 | ssize_t l=readlink(from, buf, sizeof(buf)-1); |
| 162 | |
| 163 | if (l < 0) |
| 164 | { |
| 165 | fprintf(stderr, "WARN: %s: %s!!\n", from, strerror(errno)); |
| 166 | return; |
| 167 | } |
| 168 | buf[l]=0; |
| 169 | |
| 170 | if (symlink(buf, to) < 0 || lchown(to, uid, gid) < 0) |
| 171 | { |
| 172 | fprintf(stderr, "WARN: %s: %s!!\n", from, strerror(errno)); |
| 173 | return; |
| 174 | } |
| 175 | } |
| 176 | |
| 177 | static int do_mkhomedir(const char *skeldir, |
| 178 | const char *homedir, |
| 179 | uid_t uid, |
| 180 | gid_t gid) |
| 181 | { |
| 182 | struct stat stat_buf; |
| 183 | DIR *d; |
| 184 | struct dirent *de; |
| 185 | |
| 186 | mkdir(homedir, 0); |
| 187 | |
| 188 | if (stat(skeldir, &stat_buf) < 0 || |
| 189 | chmod(homedir, stat_buf.st_mode & ~S_IFMT) || |
| 190 | chown(homedir, uid, gid) < 0) |
| 191 | { |
| 192 | fprintf(stderr, "WARN: %s: %s!!\n", skeldir, strerror(errno)); |
| 193 | return 0; |
| 194 | } |
| 195 | |
| 196 | if ((d=opendir(skeldir)) != NULL) |
| 197 | { |
| 198 | while ((de=readdir(d)) != NULL) |
| 199 | { |
| 200 | char *fskeldir, *fhomedir; |
| 201 | |
| 202 | if (strcmp(de->d_name, ".") == 0) |
| 203 | continue; |
| 204 | if (strcmp(de->d_name, "..") == 0) |
| 205 | continue; |
| 206 | |
| 207 | fskeldir=malloc(strlen(skeldir)+2+strlen(de->d_name)); |
| 208 | fhomedir=malloc(strlen(homedir)+2+strlen(de->d_name)); |
| 209 | |
| 210 | if (fskeldir && fhomedir) |
| 211 | { |
| 212 | strcat(strcat(strcpy(fskeldir, skeldir), "/"), |
| 213 | de->d_name); |
| 214 | strcat(strcat(strcpy(fhomedir, homedir), "/"), |
| 215 | de->d_name); |
| 216 | |
| 217 | if (lstat(fskeldir, &stat_buf) == 0) |
| 218 | { |
| 219 | if (S_ISDIR(stat_buf.st_mode)) |
| 220 | { |
| 221 | do_mkhomedir(fskeldir, fhomedir, |
| 222 | uid, gid); |
| 223 | } |
| 224 | else if (S_ISLNK(stat_buf.st_mode)) |
| 225 | { |
| 226 | do_symlink(fskeldir, fhomedir, |
| 227 | uid, gid); |
| 228 | } |
| 229 | else if (S_ISREG(stat_buf.st_mode)) |
| 230 | { |
| 231 | do_copy(fskeldir, fhomedir, |
| 232 | &stat_buf, |
| 233 | uid, gid); |
| 234 | } |
| 235 | } |
| 236 | } |
| 237 | |
| 238 | if (fskeldir) |
| 239 | free(fskeldir); |
| 240 | if (fhomedir) |
| 241 | free(fhomedir); |
| 242 | } |
| 243 | closedir(d); |
| 244 | } |
| 245 | return 0; |
| 246 | } |
| 247 | |
| 248 | static int mkhomedir(struct authinfo *ainfo, |
| 249 | const char *skel) |
| 250 | { |
| 251 | if (ainfo->sysusername) |
| 252 | { |
| 253 | struct passwd *pw=getpwnam(ainfo->sysusername); |
| 254 | return do_mkhomedir(skel, ainfo->homedir, |
| 255 | pw->pw_uid, |
| 256 | pw->pw_gid); |
| 257 | } |
| 258 | |
| 259 | return do_mkhomedir(skel, ainfo->homedir, |
| 260 | *ainfo->sysuserid, ainfo->sysgroupid); |
| 261 | } |
| 262 | |
| 263 | int auth_mkhomedir(struct authinfo *ainfo) |
| 264 | { |
| 265 | struct stat stat_buf; |
| 266 | |
| 267 | const char *p=getenv("AUTH_MKHOMEDIR_SKEL"); |
| 268 | |
| 269 | if (p && *p && ainfo->address && |
| 270 | (ainfo->sysusername || ainfo->sysuserid) && |
| 271 | ainfo->homedir && stat(ainfo->homedir, &stat_buf) < 0 && |
| 272 | errno == ENOENT && stat(p, &stat_buf) == 0) |
| 273 | { |
| 274 | int rc; |
| 275 | mode_t old_umask=umask(0777); |
| 276 | |
| 277 | rc=mkhomedir(ainfo, p); |
| 278 | |
| 279 | umask(old_umask); |
| 280 | |
| 281 | if (rc) |
| 282 | return rc; |
| 283 | } |
| 284 | return 0; |
| 285 | } |
| 286 | |
| 287 | int auth_callback_default_autocreate(struct authinfo *ainfo) |
| 288 | { |
| 289 | int rc=auth_mkhomedir(ainfo); |
| 290 | |
| 291 | if (rc) |
| 292 | return rc; |
| 293 | |
| 294 | return auth_callback_default(ainfo); |
| 295 | } |