user_list.c

   1 /*
   2  * Copyright (C) 2006-2008 Andre Noll <maan@systemlinux.org>
   3  *
   4  * Licensed under the GPL v2. For licencing details see COPYING.
   5  */
   6
   7 /** \file user_list.c user handling for para_server */
   8
   9 #include <sys/types.h>
  10 #include <dirent.h>
  11
  12 #include "para.h"
  13 #include "error.h"
  14 #include "fd.h"
  15 #include "string.h"
  16 #include "list.h"
  17 #include "user_list.h"
  18
  19 static struct list_head user_list;
  20
  21 /*
  22  * Fill the list of users known to para_server.
  23  *
  24  * Populates a linked list of all users in \a user_list_file.  Returns on
  25  * success, calls exit() on errors.
  26  */
  27 static void populate_user_list(char *user_list_file)
  28 {
  29         FILE *file_ptr = NULL;
  30         char *char_ptr;
  31         char line[MAXLINE];
  32         /* keyword, user, key, perms */
  33         char w[MAXLINE], n[MAXLINE], k[MAXLINE], p[MAXLINE], tmp[4][MAXLINE];
  34         int num, ret;
  35
  36         file_ptr = fopen(user_list_file, "r");
  37         ret = -E_USERLIST;
  38         if (!file_ptr)
  39                 goto out;
  40         for (;;) {
  41                 struct user *u;
  42                 ret = para_fgets(line, MAXLINE, file_ptr);
  43                 if (ret < 0)
  44                         PARA_ERROR_LOG("%s\n", para_strerror(-ret));
  45                 if (ret <= 0)
  46                         break;
  47                 if (sscanf(line,"%200s %200s %200s %200s", w, n, k, p) < 3)
  48                         continue;
  49                 if (strcmp(w, "user"))
  50                         continue;
  51                 PARA_DEBUG_LOG("found entry for %s\n", n);
  52                 u = para_malloc(sizeof(struct user));
  53                 u->name = para_strdup(n);
  54                 ret = get_rsa_key(k, &u->rsa, LOAD_PUBLIC_KEY);
  55                 if (ret < 0)
  56                         break;
  57                 char_ptr = p;
  58                 num = sscanf(char_ptr, "%200[A-Z_],%200[A-Z_],%200[A-Z_],%200[A-Z_]",
  59                         tmp[0], tmp[1], tmp[2], tmp[3]);
  60                 PARA_DEBUG_LOG("found %i perm entries\n", num);
  61                 u->perms = 0;
  62                 while (num > 0) {
  63                         num--;
  64                         if (!strcmp(tmp[num], "VSS_READ"))
  65                                 u->perms |= VSS_READ;
  66                         else if (!strcmp(tmp[num], "VSS_WRITE"))
  67                                 u->perms |= VSS_WRITE;
  68                         else if (!strcmp(tmp[num], "AFS_READ"))
  69                                 u->perms |= AFS_READ;
  70                         else if (!strcmp(tmp[num], "AFS_WRITE"))
  71                                 u->perms |= AFS_WRITE;
  72                         else /* unknown permission */
  73                                 PARA_WARNING_LOG("ignoring unknown permission: %s\n",
  74                                         tmp[num]);
  75                 }
  76                 para_list_add(&u->node, &user_list);
  77         }
  78 out:
  79         if (file_ptr)
  80                 fclose(file_ptr);
  81         if (ret >= 0)
  82                 return;
  83         PARA_EMERG_LOG("%s\n", para_strerror(-ret));
  84         exit(EXIT_FAILURE);
  85 }
  86
  87 /**
  88  * initialize the list of users allowed to connecto to para_server
  89  *
  90  * \param user_list_file the file containing access information
  91  *
  92  * If this function is called a second time, the contents of the
  93  * previous call are discarded.
  94  */
  95 void init_user_list(char *user_list_file)
  96 {
  97         struct user *u, *tmp;
  98         static int initialized;
  99
 100         if (initialized) {
 101                 list_for_each_entry_safe(u, tmp, &user_list, node) {
 102                         list_del(&u->node);
 103                         free(u->name);
 104                         rsa_free(u->rsa);
 105                         free(u);
 106                 }
 107         } else
 108                 INIT_LIST_HEAD(&user_list);
 109         initialized = 1;
 110         populate_user_list(user_list_file);
 111 }
 112
 113 /**
 114  * lookup user in user_list.
 115  *
 116  * \param name of the user
 117  *
 118  * \return a pointer to the corresponding user struct if the user was found,
 119  *  \p NULL otherwise.
 120  */
 121 struct user *lookup_user(const char *name)
 122 {
 123         struct user *u;
 124         list_for_each_entry(u, &user_list, node) {
 125                 if (strcmp(u->name, name))
 126                         continue;
 127                 return u;
 128         }
 129         return NULL;
 130 }