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https://github.com/AsahiLinux/u-boot
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env: Add support for access control to .flags
Add support for read-only, write-once, and change-default. Signed-off-by: Joe Hershberger <joe.hershberger@ni.com>
This commit is contained in:
parent
fffad71bc4
commit
267541f776
7 changed files with 330 additions and 18 deletions
13
README
13
README
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@ -3128,7 +3128,8 @@ Configuration Settings:
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The format of the list is:
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type_attribute = [s|d|x|b|i|m]
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attributes = type_attribute
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access_atribute = [a|r|o|c]
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attributes = type_attribute[access_atribute]
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entry = variable_name[:attributes]
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list = entry[,list]
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@ -3140,6 +3141,12 @@ Configuration Settings:
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i - IP address
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m - MAC address
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The access attributes are:
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a - Any (default)
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r - Read-only
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o - Write-once
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c - Change-default
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- CONFIG_ENV_FLAGS_LIST_DEFAULT
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Define this to a list (string) to define the ".flags"
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envirnoment variable in the default or embedded environment.
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@ -3151,6 +3158,10 @@ Configuration Settings:
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list, simply add an entry for the same variable name to the
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".flags" variable.
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- CONFIG_ENV_ACCESS_IGNORE_FORCE
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If defined, don't allow the -f switch to env set override variable
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access flags.
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The following definitions that deal with the placement and management
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of environment data (variable area); in general, we support the
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following configurations:
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@ -447,8 +447,11 @@ int do_env_callback(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
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static int print_static_flags(const char *var_name, const char *flags)
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{
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enum env_flags_vartype type = env_flags_parse_vartype(flags);
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enum env_flags_varaccess access = env_flags_parse_varaccess(flags);
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printf("\t%-20s %-20s\n", var_name, env_flags_get_vartype_name(type));
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printf("\t%-20s %-20s %-20s\n", var_name,
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env_flags_get_vartype_name(type),
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env_flags_get_varaccess_name(access));
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return 0;
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}
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@ -456,13 +459,17 @@ static int print_static_flags(const char *var_name, const char *flags)
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static int print_active_flags(ENTRY *entry)
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{
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enum env_flags_vartype type;
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enum env_flags_varaccess access;
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if (entry->flags == 0)
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return 0;
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type = (enum env_flags_vartype)
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(entry->flags & ENV_FLAGS_VARTYPE_BIN_MASK);
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printf("\t%-20s %-20s\n", entry->key, env_flags_get_vartype_name(type));
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access = env_flags_parse_varaccess_from_binflags(entry->flags);
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printf("\t%-20s %-20s %-20s\n", entry->key,
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env_flags_get_vartype_name(type),
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env_flags_get_varaccess_name(access));
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return 0;
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}
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@ -480,17 +487,29 @@ int do_env_flags(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
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env_flags_print_vartypes();
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puts("\n");
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/* Print the available variable access types */
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printf("Available variable access flags (position %d):\n",
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ENV_FLAGS_VARACCESS_LOC);
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puts("\tFlag\tVariable Access Name\n");
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puts("\t----\t--------------------\n");
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env_flags_print_varaccess();
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puts("\n");
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/* Print the static flags that may exist */
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puts("Static flags:\n");
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printf("\t%-20s %-20s\n", "Variable Name", "Variable Type");
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printf("\t%-20s %-20s\n", "-------------", "-------------");
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printf("\t%-20s %-20s %-20s\n", "Variable Name", "Variable Type",
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"Variable Access");
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printf("\t%-20s %-20s %-20s\n", "-------------", "-------------",
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"---------------");
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env_attr_walk(ENV_FLAGS_LIST_STATIC, print_static_flags);
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puts("\n");
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/* walk through each variable and print the flags if non-default */
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puts("Active flags:\n");
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printf("\t%-20s %-20s\n", "Variable Name", "Variable Type");
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printf("\t%-20s %-20s\n", "-------------", "-------------");
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printf("\t%-20s %-20s %-20s\n", "Variable Name", "Variable Type",
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"Variable Access");
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printf("\t%-20s %-20s %-20s\n", "-------------", "-------------",
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"---------------");
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hwalk_r(&env_htab, print_active_flags);
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return 0;
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}
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@ -95,6 +95,24 @@ int getenv_yesno(const char *var)
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1 : 0;
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}
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/*
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* Look up the variable from the default environment
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*/
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char *getenv_default(const char *name)
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{
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char *ret_val;
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unsigned long really_valid = gd->env_valid;
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unsigned long real_gd_flags = gd->flags;
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/* Pretend that the image is bad. */
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gd->flags &= ~GD_FLG_ENV_READY;
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gd->env_valid = 0;
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ret_val = getenv(name);
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gd->env_valid = really_valid;
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gd->flags = real_gd_flags;
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return ret_val;
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}
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void set_default_env(const char *s)
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{
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int flags = 0;
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@ -43,6 +43,17 @@
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#endif
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static const char env_flags_vartype_rep[] = "sdxb" ENV_FLAGS_NET_VARTYPE_REPS;
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static const char env_flags_varaccess_rep[] = "aroc";
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static const int env_flags_varaccess_mask[] = {
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0,
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ENV_FLAGS_VARACCESS_PREVENT_DELETE |
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ENV_FLAGS_VARACCESS_PREVENT_CREATE |
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ENV_FLAGS_VARACCESS_PREVENT_OVERWR,
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ENV_FLAGS_VARACCESS_PREVENT_DELETE |
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ENV_FLAGS_VARACCESS_PREVENT_OVERWR,
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ENV_FLAGS_VARACCESS_PREVENT_DELETE |
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ENV_FLAGS_VARACCESS_PREVENT_NONDEF_OVERWR};
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#ifdef CONFIG_CMD_ENV_FLAGS
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static const char * const env_flags_vartype_names[] = {
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"string",
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@ -54,6 +65,12 @@ static const char * const env_flags_vartype_names[] = {
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"MAC address",
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#endif
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};
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static const char * const env_flags_varaccess_names[] = {
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"any",
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"read-only",
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"write-once",
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"change-default",
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};
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/*
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* Print the whole list of available type flags.
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@ -69,6 +86,20 @@ void env_flags_print_vartypes(void)
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}
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}
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/*
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* Print the whole list of available access flags.
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*/
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void env_flags_print_varaccess(void)
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{
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enum env_flags_varaccess curaccess = (enum env_flags_varaccess)0;
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while (curaccess != env_flags_varaccess_end) {
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printf("\t%c -\t%s\n", env_flags_varaccess_rep[curaccess],
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env_flags_varaccess_names[curaccess]);
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curaccess++;
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}
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}
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/*
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* Return the name of the type.
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*/
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@ -76,6 +107,14 @@ const char *env_flags_get_vartype_name(enum env_flags_vartype type)
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{
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return env_flags_vartype_names[type];
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}
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/*
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* Return the name of the access.
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*/
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const char *env_flags_get_varaccess_name(enum env_flags_varaccess access)
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{
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return env_flags_varaccess_names[access];
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}
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#endif /* CONFIG_CMD_ENV_FLAGS */
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/*
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@ -100,6 +139,46 @@ enum env_flags_vartype env_flags_parse_vartype(const char *flags)
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return env_flags_vartype_string;
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}
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/*
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* Parse the flags string from a .flags attribute list into the varaccess enum.
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*/
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enum env_flags_varaccess env_flags_parse_varaccess(const char *flags)
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{
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char *access;
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if (strlen(flags) <= ENV_FLAGS_VARACCESS_LOC)
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return env_flags_varaccess_any;
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access = strchr(env_flags_varaccess_rep,
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flags[ENV_FLAGS_VARACCESS_LOC]);
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if (access != NULL)
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return (enum env_flags_varaccess)
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(access - &env_flags_varaccess_rep[0]);
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printf("## Warning: Unknown environment variable access method '%c'\n",
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flags[ENV_FLAGS_VARACCESS_LOC]);
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return env_flags_varaccess_any;
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}
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/*
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* Parse the binary flags from a hash table entry into the varaccess enum.
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*/
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enum env_flags_varaccess env_flags_parse_varaccess_from_binflags(int binflags)
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{
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int i;
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for (i = 0; i < sizeof(env_flags_varaccess_mask); i++)
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if (env_flags_varaccess_mask[i] ==
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(binflags & ENV_FLAGS_VARACCESS_BIN_MASK))
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return (enum env_flags_varaccess)i;
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printf("Warning: Non-standard access flags. (0x%x)\n",
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binflags & ENV_FLAGS_VARACCESS_BIN_MASK);
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return env_flags_varaccess_any;
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}
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static inline int is_hex_prefix(const char *value)
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{
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return value[0] == '0' && (value[1] == 'x' || value[1] == 'X');
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@ -241,6 +320,23 @@ enum env_flags_vartype env_flags_get_type(const char *name)
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return env_flags_parse_vartype(flags);
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}
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/*
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* Look up the access of a variable directly from the .flags var.
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*/
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enum env_flags_varaccess env_flags_get_varaccess(const char *name)
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{
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const char *flags_list = getenv(ENV_FLAGS_VAR);
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char flags[ENV_FLAGS_ATTR_MAX_LEN + 1];
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if (env_flags_lookup(flags_list, name, flags))
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return env_flags_varaccess_any;
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if (strlen(flags) <= ENV_FLAGS_VARACCESS_LOC)
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return env_flags_varaccess_any;
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return env_flags_parse_varaccess(flags);
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}
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/*
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* Validate that the proposed new value for "name" is valid according to the
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* defined flags for that variable, if any.
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@ -261,6 +357,21 @@ int env_flags_validate_type(const char *name, const char *value)
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return 0;
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}
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/*
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* Validate that the proposed access to variable "name" is valid according to
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* the defined flags for that variable, if any.
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*/
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int env_flags_validate_varaccess(const char *name, int check_mask)
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{
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enum env_flags_varaccess access;
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int access_mask;
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access = env_flags_get_varaccess(name);
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access_mask = env_flags_varaccess_mask[access];
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return (check_mask & access_mask) != 0;
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}
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/*
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* Validate the parameters to "env set" directly
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*/
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@ -292,7 +403,12 @@ int env_flags_validate_env_set_params(int argc, char * const argv[])
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*/
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static int env_parse_flags_to_bin(const char *flags)
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{
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return env_flags_parse_vartype(flags) & ENV_FLAGS_VARTYPE_BIN_MASK;
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int binflags;
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binflags = env_flags_parse_vartype(flags) & ENV_FLAGS_VARTYPE_BIN_MASK;
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binflags |= env_flags_varaccess_mask[env_flags_parse_varaccess(flags)];
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return binflags;
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}
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/*
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@ -377,13 +493,10 @@ int env_flags_validate(const ENTRY *item, const char *newval, enum env_op op,
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int flag)
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{
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const char *name;
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#if !defined(CONFIG_ENV_OVERWRITE) && defined(CONFIG_OVERWRITE_ETHADDR_ONCE) \
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&& defined(CONFIG_ETHADDR)
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const char *oldval = NULL;
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if (op != env_op_create)
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oldval = item->data;
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#endif
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name = item->key;
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@ -422,6 +535,44 @@ int env_flags_validate(const ENTRY *item, const char *newval, enum env_op op,
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}
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}
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/* check for access permission */
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#ifndef CONFIG_ENV_ACCESS_IGNORE_FORCE
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if (flag & H_FORCE)
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return 0;
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#endif
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switch (op) {
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case env_op_delete:
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if (item->flags & ENV_FLAGS_VARACCESS_PREVENT_DELETE) {
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printf("## Error: Can't delete \"%s\"\n", name);
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return 1;
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}
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break;
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case env_op_overwrite:
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if (item->flags & ENV_FLAGS_VARACCESS_PREVENT_OVERWR) {
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printf("## Error: Can't overwrite \"%s\"\n", name);
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return 1;
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} else if (item->flags &
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ENV_FLAGS_VARACCESS_PREVENT_NONDEF_OVERWR) {
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const char *defval = getenv_default(name);
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if (defval == NULL)
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defval = "";
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printf("oldval: %s defval: %s\n", oldval, defval);
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if (strcmp(oldval, defval) != 0) {
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printf("## Error: Can't overwrite \"%s\"\n",
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name);
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return 1;
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}
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}
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break;
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case env_op_create:
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if (item->flags & ENV_FLAGS_VARACCESS_PREVENT_CREATE) {
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printf("## Error: Can't create \"%s\"\n", name);
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return 1;
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}
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break;
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}
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return 0;
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}
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@ -36,9 +36,18 @@ enum env_flags_vartype {
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env_flags_vartype_end
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};
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enum env_flags_varaccess {
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env_flags_varaccess_any,
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env_flags_varaccess_readonly,
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env_flags_varaccess_writeonce,
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env_flags_varaccess_changedefault,
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env_flags_varaccess_end
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};
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#define ENV_FLAGS_VAR ".flags"
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#define ENV_FLAGS_ATTR_MAX_LEN 2
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#define ENV_FLAGS_VARTYPE_LOC 0
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#define ENV_FLAGS_VARACCESS_LOC 1
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#ifndef CONFIG_ENV_FLAGS_LIST_STATIC
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#define CONFIG_ENV_FLAGS_LIST_STATIC ""
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@ -52,27 +61,57 @@ enum env_flags_vartype {
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* Print the whole list of available type flags.
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*/
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void env_flags_print_vartypes(void);
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/*
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* Print the whole list of available access flags.
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*/
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void env_flags_print_varaccess(void);
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/*
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* Return the name of the type.
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*/
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const char *env_flags_get_vartype_name(enum env_flags_vartype type);
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/*
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* Return the name of the access.
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*/
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const char *env_flags_get_varaccess_name(enum env_flags_varaccess access);
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#endif
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/*
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* Parse the flags string from a .flags attribute list into the vartype enum.
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*/
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enum env_flags_vartype env_flags_parse_vartype(const char *flags);
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/*
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* Parse the flags string from a .flags attribute list into the varaccess enum.
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*/
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enum env_flags_varaccess env_flags_parse_varaccess(const char *flags);
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/*
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* Parse the binary flags from a hash table entry into the varaccess enum.
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*/
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enum env_flags_varaccess env_flags_parse_varaccess_from_binflags(int binflags);
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#ifdef USE_HOSTCC
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/*
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* Look up the type of a variable directly from the .flags var.
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*/
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enum env_flags_vartype env_flags_get_type(const char *name);
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/*
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* Look up the access of a variable directly from the .flags var.
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*/
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enum env_flags_varaccess env_flags_get_access(const char *name);
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/*
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* Validate the newval for its type to conform with the requirements defined by
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* its flags (directly looked at the .flags var).
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*/
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int env_flags_validate_type(const char *name, const char *newval);
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/*
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* Validate the newval for its access to conform with the requirements defined
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* by its flags (directly looked at the .flags var).
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*/
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int env_flags_validate_access(const char *name, int check_mask);
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/*
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* Validate that the proposed access to variable "name" is valid according to
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* the defined flags for that variable, if any.
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*/
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int env_flags_validate_varaccess(const char *name, int check_mask);
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/*
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* Validate the parameters passed to "env set" for type compliance
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*/
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@ -94,13 +133,18 @@ void env_flags_init(ENTRY *var_entry);
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int env_flags_validate(const ENTRY *item, const char *newval, enum env_op op,
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int flag);
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#endif /* USE_HOSTCC */
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/*
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* These are the binary flags used in the environment entry->flags variable to
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* decribe properties of veriables in the table
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*/
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#define ENV_FLAGS_VARTYPE_BIN_MASK 0x00000007
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#define ENV_FLAGS_VARTYPE_BIN_MASK 0x00000007
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/* The actual variable type values use the enum value (within the mask) */
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#endif /* USE_HOSTCC */
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#define ENV_FLAGS_VARACCESS_PREVENT_DELETE 0x00000008
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#define ENV_FLAGS_VARACCESS_PREVENT_CREATE 0x00000010
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#define ENV_FLAGS_VARACCESS_PREVENT_OVERWR 0x00000020
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#define ENV_FLAGS_VARACCESS_PREVENT_NONDEF_OVERWR 0x00000040
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#define ENV_FLAGS_VARACCESS_BIN_MASK 0x00000078
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|
||||
#endif /* __ENV_FLAGS_H__ */
|
||||
|
|
|
@ -181,6 +181,9 @@ unsigned char env_get_char_memory(int index);
|
|||
/* Function that updates CRC of the enironment */
|
||||
void env_crc_update(void);
|
||||
|
||||
/* Look up the variable from the default environment */
|
||||
char *getenv_default(const char *name);
|
||||
|
||||
/* [re]set to the default environment */
|
||||
void set_default_env(const char *s);
|
||||
|
||||
|
|
74
tools/env/fw_env.c
vendored
74
tools/env/fw_env.c
vendored
|
@ -181,6 +181,32 @@ char *fw_getenv (char *name)
|
|||
return NULL;
|
||||
}
|
||||
|
||||
/*
|
||||
* Search the default environment for a variable.
|
||||
* Return the value, if found, or NULL, if not found.
|
||||
*/
|
||||
char *fw_getdefenv(char *name)
|
||||
{
|
||||
char *env, *nxt;
|
||||
|
||||
for (env = default_environment; *env; env = nxt + 1) {
|
||||
char *val;
|
||||
|
||||
for (nxt = env; *nxt; ++nxt) {
|
||||
if (nxt >= &default_environment[ENV_SIZE]) {
|
||||
fprintf(stderr, "## Error: "
|
||||
"default environment not terminated\n");
|
||||
return NULL;
|
||||
}
|
||||
}
|
||||
val = envmatch(name, env);
|
||||
if (!val)
|
||||
continue;
|
||||
return val;
|
||||
}
|
||||
return NULL;
|
||||
}
|
||||
|
||||
/*
|
||||
* Print the current definition of one, or more, or all
|
||||
* environment variables
|
||||
|
@ -282,6 +308,7 @@ int fw_env_write(char *name, char *value)
|
|||
int len;
|
||||
char *env, *nxt;
|
||||
char *oldval = NULL;
|
||||
int deleting, creating, overwriting;
|
||||
|
||||
/*
|
||||
* search if variable with this name already exists
|
||||
|
@ -299,10 +326,49 @@ int fw_env_write(char *name, char *value)
|
|||
break;
|
||||
}
|
||||
|
||||
/*
|
||||
* Delete any existing definition
|
||||
*/
|
||||
if (oldval) {
|
||||
deleting = (oldval && !(value && strlen(value)));
|
||||
creating = (!oldval && (value && strlen(value)));
|
||||
overwriting = (oldval && (value && strlen(value)));
|
||||
|
||||
/* check for permission */
|
||||
if (deleting) {
|
||||
if (env_flags_validate_varaccess(name,
|
||||
ENV_FLAGS_VARACCESS_PREVENT_DELETE)) {
|
||||
printf("Can't delete \"%s\"\n", name);
|
||||
errno = EROFS;
|
||||
return -1;
|
||||
}
|
||||
} else if (overwriting) {
|
||||
if (env_flags_validate_varaccess(name,
|
||||
ENV_FLAGS_VARACCESS_PREVENT_OVERWR)) {
|
||||
printf("Can't overwrite \"%s\"\n", name);
|
||||
errno = EROFS;
|
||||
return -1;
|
||||
} else if (env_flags_validate_varaccess(name,
|
||||
ENV_FLAGS_VARACCESS_PREVENT_NONDEF_OVERWR)) {
|
||||
const char *defval = fw_getdefenv(name);
|
||||
|
||||
if (defval == NULL)
|
||||
defval = "";
|
||||
if (strcmp(oldval, defval)
|
||||
!= 0) {
|
||||
printf("Can't overwrite \"%s\"\n", name);
|
||||
errno = EROFS;
|
||||
return -1;
|
||||
}
|
||||
}
|
||||
} else if (creating) {
|
||||
if (env_flags_validate_varaccess(name,
|
||||
ENV_FLAGS_VARACCESS_PREVENT_CREATE)) {
|
||||
printf("Can't create \"%s\"\n", name);
|
||||
errno = EROFS;
|
||||
return -1;
|
||||
}
|
||||
} else
|
||||
/* Nothing to do */
|
||||
return 0;
|
||||
|
||||
if (deleting || overwriting) {
|
||||
#ifndef CONFIG_ENV_OVERWRITE
|
||||
/*
|
||||
* Ethernet Address and serial# can be set only once
|
||||
|
|
Loading…
Reference in a new issue